pm8941-wled.c driver is supporting the WLED peripheral on pm8941. Rename it to qcom-wled.c so that it can support WLED on multiple PMICs.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Acked-by: Rob Herring robh@kernel.org Acked-by: Daniel Thompson daniel.thompson@linaro.org Acked-by: Pavel Machek pavel@ucw.cz --- .../bindings/leds/backlight/{pm8941-wled.txt => qcom-wled.txt} | 2 +- drivers/video/backlight/Kconfig | 8 ++++---- drivers/video/backlight/Makefile | 2 +- drivers/video/backlight/{pm8941-wled.c => qcom-wled.c} | 0 4 files changed, 6 insertions(+), 6 deletions(-) rename Documentation/devicetree/bindings/leds/backlight/{pm8941-wled.txt => qcom-wled.txt} (95%) rename drivers/video/backlight/{pm8941-wled.c => qcom-wled.c} (100%)

diff --git a/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt similarity index 95% rename from Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt rename to Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt index e5b294d..fb39e32 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt @@ -1,4 +1,4 @@ -Binding for Qualcomm PM8941 WLED driver +Binding for Qualcomm Technologies, Inc. WLED driver

Required properties: - compatible: should be "qcom,pm8941-wled" diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 40676be..73442bdf 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -282,12 +282,12 @@ config BACKLIGHT_TOSA If you have an Sharp SL-6000 Zaurus say Y to enable a driver for its backlight

-config BACKLIGHT_PM8941_WLED - tristate "Qualcomm PM8941 WLED Driver" +config BACKLIGHT_QCOM_WLED + tristate "Qualcomm PMIC WLED Driver" select REGMAP help - If you have the Qualcomm PM8941, say Y to enable a driver for the - WLED block. + If you have the Qualcomm PMIC, say Y to enable a driver for the + WLED block. Currently it supports PM8941 and PMI8998.

config BACKLIGHT_SAHARA tristate "Tabletkiosk Sahara Touch-iT Backlight Driver" diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 63c507c..6f87770 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -48,8 +48,8 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o -obj-$(CONFIG_BACKLIGHT_PM8941_WLED) += pm8941-wled.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o +obj-$(CONFIG_BACKLIGHT_QCOM_WLED) += qcom-wled.o obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o diff --git a/drivers/video/backlight/pm8941-wled.c b/drivers/video/backlight/qcom-wled.c similarity index 100% rename from drivers/video/backlight/pm8941-wled.c rename to drivers/video/backlight/qcom-wled.c

Restructure the qcom-wled bindings for the better readability.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Reviewed-by: Rob Herring robh@kernel.org Acked-by: Daniel Thompson daniel.thompson@linaro.org Acked-by: Pavel Machek pavel@ucw.cz --- .../bindings/leds/backlight/qcom-wled.txt | 110 ++++++++++++++++----- 1 file changed, 85 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt index fb39e32..14f28f2 100644 --- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt @@ -1,30 +1,90 @@ Binding for Qualcomm Technologies, Inc. WLED driver

-Required properties: -- compatible: should be "qcom,pm8941-wled" -- reg: slave address - -Optional properties: -- default-brightness: brightness value on boot, value from: 0-4095 - default: 2048 -- label: The name of the backlight device -- qcom,cs-out: bool; enable current sink output -- qcom,cabc: bool; enable content adaptive backlight control -- qcom,ext-gen: bool; use externally generated modulator signal to dim -- qcom,current-limit: mA; per-string current limit; value from 0 to 25 - default: 20mA -- qcom,current-boost-limit: mA; boost current limit; one of: - 105, 385, 525, 805, 980, 1260, 1400, 1680 - default: 805mA -- qcom,switching-freq: kHz; switching frequency; one of: - 600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371, - 1600, 1920, 2400, 3200, 4800, 9600, - default: 1600kHz -- qcom,ovp: V; Over-voltage protection limit; one of: - 27, 29, 32, 35 - default: 29V -- qcom,num-strings: #; number of led strings attached; value from 1 to 3 - default: 2 +WLED (White Light Emitting Diode) driver is used for controlling display +backlight that is part of PMIC on Qualcomm Technologies, Inc. reference +platforms. The PMIC is connected to the host processor via SPMI bus. + +- compatible + Usage: required + Value type: <string> + Definition: should be one of: + "qcom,pm8941-wled" + "qcom,pmi8998-wled" + "qcom,pm660l-wled" + +- reg + Usage: required + Value type: <prop encoded array> + Definition: Base address of the WLED modules. + +- default-brightness + Usage: optional + Value type: <u32> + Definition: brightness value on boot, value from: 0-4095 + Default: 2048 + +- label + Usage: required + Value type: <string> + Definition: The name of the backlight device + +- qcom,cs-out + Usage: optional + Value type: <bool> + Definition: enable current sink output. + This property is supported only for PM8941. + +- qcom,cabc + Usage: optional + Value type: <bool> + Definition: enable content adaptive backlight control. + +- qcom,ext-gen + Usage: optional + Value type: <bool> + Definition: use externally generated modulator signal to dim. + This property is supported only for PM8941. + +- qcom,current-limit + Usage: optional + Value type: <u32> + Definition: mA; per-string current limit + value: For pm8941: from 0 to 25 with 5 mA step + Default 20 mA. + For pmi8998: from 0 to 30 with 5 mA step + Default 25 mA. + +- qcom,current-boost-limit + Usage: optional + Value type: <u32> + Definition: mA; boost current limit. + For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400, + 1680. Default: 805 mA + For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300, + 1500. Default: 970 mA + +- qcom,switching-freq + Usage: optional + Value type: <u32> + Definition: kHz; switching frequency; one of: 600, 640, 685, 738, + 800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200, + 4800, 9600. + Default: for pm8941: 1600 kHz + for pmi8998: 800 kHz + +- qcom,ovp + Usage: optional + Value type: <u32> + Definition: V; Over-voltage protection limit; one of: + 27, 29, 32, 35. default: 29V + This property is supported only for PM8941. + +- qcom,num-strings + Usage: optional + Value type: <u32> + Definition: #; number of led strings attached; + value from 1 to 3. default: 2 + This property is supported only for PM8941.

Example:

Update the bindings with the new properties used for PMI8998.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Reviewed-by: Rob Herring robh@kernel.org Acked-by: Daniel Thompson daniel.thompson@linaro.org --- .../bindings/leds/backlight/qcom-wled.txt | 74 ++++++++++++++++++---- 1 file changed, 63 insertions(+), 11 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt index 14f28f2..c06863b 100644 --- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt @@ -20,7 +20,7 @@ platforms. The PMIC is connected to the host processor via SPMI bus. - default-brightness Usage: optional Value type: <u32> - Definition: brightness value on boot, value from: 0-4095 + Definition: brightness value on boot, value from: 0-4095. Default: 2048

- label @@ -48,20 +48,24 @@ platforms. The PMIC is connected to the host processor via SPMI bus. - qcom,current-limit Usage: optional Value type: <u32> - Definition: mA; per-string current limit - value: For pm8941: from 0 to 25 with 5 mA step - Default 20 mA. - For pmi8998: from 0 to 30 with 5 mA step - Default 25 mA. + Definition: mA; per-string current limit; value from 0 to 25 with + 1 mA step. Default 20 mA. + This property is supported only for pm8941. + +- qcom,current-limit-microamp + Usage: optional + Value type: <u32> + Definition: uA; per-string current limit; value from 0 to 30000 with + 2500 uA step. Default 25 mA.

- qcom,current-boost-limit Usage: optional Value type: <u32> Definition: mA; boost current limit. For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400, - 1680. Default: 805 mA + 1680. Default: 805 mA. For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300, - 1500. Default: 970 mA + 1500. Default: 970 mA.

- qcom,switching-freq Usage: optional @@ -76,15 +80,62 @@ platforms. The PMIC is connected to the host processor via SPMI bus. Usage: optional Value type: <u32> Definition: V; Over-voltage protection limit; one of: - 27, 29, 32, 35. default: 29V + 27, 29, 32, 35. Default: 29V This property is supported only for PM8941.

+- qcom,ovp-millivolt + Usage: optional + Value type: <u32> + Definition: mV; Over-voltage protection limit; + For pmi8998: one of 18100, 19600, 29600, 31100. + Default 29600 mV. + If this property is not specified for PM8941, it + falls back to "qcom,ovp" property. + - qcom,num-strings Usage: optional Value type: <u32> Definition: #; number of led strings attached; - value from 1 to 3. default: 2 - This property is supported only for PM8941. + value: For PM8941 from 1 to 3. Default: 2 + For PMI8998 from 1 to 4. + +- interrupts + Usage: optional + Value type: <prop encoded array> + Definition: Interrupts associated with WLED. This should be + "short" and "ovp" interrupts. Interrupts can be + specified as per the encoding listed under + Documentation/devicetree/bindings/spmi/ + qcom,spmi-pmic-arb.txt. + +- interrupt-names + Usage: optional + Value type: <string> + Definition: Interrupt names associated with the interrupts. + Must be "short" and "ovp". The short circuit detection + is not supported for PM8941. + +- qcom,enabled-strings + Usage: optional + Value tyoe: <u32 array> + Definition: Array of the WLED strings numbered from 0 to 3. Each + string of leds are operated individually. Specify the + list of strings used by the device. Any combination of + led strings can be used. + +- qcom,external-pfet + Usage: optional + Value type: <bool> + Definition: Specify if external PFET control for short circuit + protection is used. This property is supported only + for PMI8998. + +- qcom,auto-string-detection + Usage: optional + Value type: <bool> + Definition: Enables auto-detection of the WLED string configuration. + This feature is not supported for PM8941. +

Example:

@@ -99,4 +150,5 @@ pm8941-wled@d800 { qcom,switching-freq = <1600>; qcom,ovp = <29>; qcom,num-strings = <2>; + qcom,enabled-strings = <0 1>; };

Rename the PM8941* references as WLED3 to make the driver generic and have WLED support for other PMICs. Also rename "i_boost_limit" and "i_limit" variables to "boost_i_limit" and "string_i_limit" respectively to resemble the corresponding register names.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Acked-by: Pavel Machek pavel@ucw.cz --- drivers/video/backlight/qcom-wled.c | 248 ++++++++++++++++++------------------ 1 file changed, 125 insertions(+), 123 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 82b8572..f191242 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -10,77 +10,79 @@ #include <linux/regmap.h>

/* From DT binding */ -#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048 +#define WLED_DEFAULT_BRIGHTNESS 2048

-#define PM8941_WLED_REG_VAL_BASE 0x40 -#define PM8941_WLED_REG_VAL_MAX 0xFFF +#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF +#define WLED3_CTRL_REG_VAL_BASE 0x40

-#define PM8941_WLED_REG_MOD_EN 0x46 -#define PM8941_WLED_REG_MOD_EN_BIT BIT(7) -#define PM8941_WLED_REG_MOD_EN_MASK BIT(7) +/* WLED3 control registers */ +#define WLED3_CTRL_REG_MOD_EN 0x46 +#define WLED3_CTRL_REG_MOD_EN_BIT BIT(7) +#define WLED3_CTRL_REG_MOD_EN_MASK BIT(7)

-#define PM8941_WLED_REG_SYNC 0x47 -#define PM8941_WLED_REG_SYNC_MASK 0x07 -#define PM8941_WLED_REG_SYNC_LED1 BIT(0) -#define PM8941_WLED_REG_SYNC_LED2 BIT(1) -#define PM8941_WLED_REG_SYNC_LED3 BIT(2) -#define PM8941_WLED_REG_SYNC_ALL 0x07 -#define PM8941_WLED_REG_SYNC_CLEAR 0x00 +#define WLED3_CTRL_REG_FREQ 0x4c +#define WLED3_CTRL_REG_FREQ_MASK 0x0f

-#define PM8941_WLED_REG_FREQ 0x4c -#define PM8941_WLED_REG_FREQ_MASK 0x0f +#define WLED3_CTRL_REG_OVP 0x4d +#define WLED3_CTRL_REG_OVP_MASK 0x03

-#define PM8941_WLED_REG_OVP 0x4d -#define PM8941_WLED_REG_OVP_MASK 0x03 +#define WLED3_CTRL_REG_ILIMIT 0x4e +#define WLED3_CTRL_REG_ILIMIT_MASK 0x07

-#define PM8941_WLED_REG_BOOST 0x4e -#define PM8941_WLED_REG_BOOST_MASK 0x07 +/* WLED3 sink registers */ +#define WLED3_SINK_REG_SYNC 0x47 +#define WLED3_SINK_REG_SYNC_MASK 0x07 +#define WLED3_SINK_REG_SYNC_LED1 BIT(0) +#define WLED3_SINK_REG_SYNC_LED2 BIT(1) +#define WLED3_SINK_REG_SYNC_LED3 BIT(2) +#define WLED3_SINK_REG_SYNC_ALL 0x07 +#define WLED3_SINK_REG_SYNC_CLEAR 0x00

-#define PM8941_WLED_REG_SINK 0x4f -#define PM8941_WLED_REG_SINK_MASK 0xe0 -#define PM8941_WLED_REG_SINK_SHFT 0x05 +#define WLED3_SINK_REG_CURR_SINK 0x4f +#define WLED3_SINK_REG_CURR_SINK_MASK 0xe0 +#define WLED3_SINK_REG_CURR_SINK_SHFT 0x05

-/* Per-'string' registers below */ -#define PM8941_WLED_REG_STR_OFFSET 0x10 +/* WLED3 per-'string' registers below */ +#define WLED3_SINK_REG_STR_OFFSET 0x10

-#define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60 -#define PM8941_WLED_REG_STR_MOD_MASK BIT(7) -#define PM8941_WLED_REG_STR_MOD_EN BIT(7) +#define WLED3_SINK_REG_STR_MOD_EN_BASE 0x60 +#define WLED3_SINK_REG_STR_MOD_MASK BIT(7) +#define WLED3_SINK_REG_STR_MOD_EN BIT(7)

-#define PM8941_WLED_REG_STR_SCALE_BASE 0x62 -#define PM8941_WLED_REG_STR_SCALE_MASK 0x1f +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR 0x62 +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK 0x1f

-#define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63 -#define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01 -#define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00 -#define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01 +#define WLED3_SINK_REG_STR_MOD_SRC_BASE 0x63 +#define WLED3_SINK_REG_STR_MOD_SRC_MASK 0x01 +#define WLED3_SINK_REG_STR_MOD_SRC_INT 0x00 +#define WLED3_SINK_REG_STR_MOD_SRC_EXT 0x01

-#define PM8941_WLED_REG_STR_CABC_BASE 0x66 -#define PM8941_WLED_REG_STR_CABC_MASK BIT(7) -#define PM8941_WLED_REG_STR_CABC_EN BIT(7) +#define WLED3_SINK_REG_STR_CABC_BASE 0x66 +#define WLED3_SINK_REG_STR_CABC_MASK BIT(7) +#define WLED3_SINK_REG_STR_CABC_EN BIT(7)

-struct pm8941_wled_config { - u32 i_boost_limit; +struct wled_config { + u32 boost_i_limit; u32 ovp; u32 switch_freq; u32 num_strings; - u32 i_limit; + u32 string_i_limit; bool cs_out_en; bool ext_gen; bool cabc_en; };

-struct pm8941_wled { +struct wled { const char *name; struct regmap *regmap; u16 addr;

- struct pm8941_wled_config cfg; + struct wled_config cfg; };

-static int pm8941_wled_update_status(struct backlight_device *bl) +static int wled_update_status(struct backlight_device *bl) { - struct pm8941_wled *wled = bl_get_data(bl); + struct wled *wled = bl_get_data(bl); u16 val = bl->props.brightness; u8 ctrl = 0; int rc; @@ -92,11 +94,11 @@ static int pm8941_wled_update_status(struct backlight_device *bl) val = 0;

if (val != 0) - ctrl = PM8941_WLED_REG_MOD_EN_BIT; + ctrl = WLED3_CTRL_REG_MOD_EN_BIT;

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_MOD_EN, - PM8941_WLED_REG_MOD_EN_MASK, ctrl); + wled->addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, ctrl); if (rc) return rc;

@@ -104,89 +106,89 @@ static int pm8941_wled_update_status(struct backlight_device *bl) u8 v[2] = { val & 0xff, (val >> 8) & 0xf };

rc = regmap_bulk_write(wled->regmap, - wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i, + wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i, v, 2); if (rc) return rc; }

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_SYNC, - PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL); + wled->addr + WLED3_SINK_REG_SYNC, + WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL); if (rc) return rc;

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_SYNC, - PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR); + wled->addr + WLED3_SINK_REG_SYNC, + WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR); return rc; }

-static int pm8941_wled_setup(struct pm8941_wled *wled) +static int wled_setup(struct wled *wled) { int rc; int i;

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_OVP, - PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp); + wled->addr + WLED3_CTRL_REG_OVP, + WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp); if (rc) return rc;

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_BOOST, - PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit); + wled->addr + WLED3_CTRL_REG_ILIMIT, + WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit); if (rc) return rc;

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_FREQ, - PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq); + wled->addr + WLED3_CTRL_REG_FREQ, + WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq); if (rc) return rc;

if (wled->cfg.cs_out_en) { u8 all = (BIT(wled->cfg.num_strings) - 1) - << PM8941_WLED_REG_SINK_SHFT; + << WLED3_SINK_REG_CURR_SINK_SHFT;

rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_SINK, - PM8941_WLED_REG_SINK_MASK, all); + wled->addr + WLED3_SINK_REG_CURR_SINK, + WLED3_SINK_REG_CURR_SINK_MASK, all); if (rc) return rc; }

for (i = 0; i < wled->cfg.num_strings; ++i) { - u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i; + u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;

rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_MOD_EN_BASE, - PM8941_WLED_REG_STR_MOD_MASK, - PM8941_WLED_REG_STR_MOD_EN); + addr + WLED3_SINK_REG_STR_MOD_EN_BASE, + WLED3_SINK_REG_STR_MOD_MASK, + WLED3_SINK_REG_STR_MOD_EN); if (rc) return rc;

if (wled->cfg.ext_gen) { rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_MOD_SRC_BASE, - PM8941_WLED_REG_STR_MOD_SRC_MASK, - PM8941_WLED_REG_STR_MOD_SRC_EXT); + addr + WLED3_SINK_REG_STR_MOD_SRC_BASE, + WLED3_SINK_REG_STR_MOD_SRC_MASK, + WLED3_SINK_REG_STR_MOD_SRC_EXT); if (rc) return rc; }

rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_SCALE_BASE, - PM8941_WLED_REG_STR_SCALE_MASK, - wled->cfg.i_limit); + addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR, + WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK, + wled->cfg.string_i_limit); if (rc) return rc;

rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_CABC_BASE, - PM8941_WLED_REG_STR_CABC_MASK, + addr + WLED3_SINK_REG_STR_CABC_BASE, + WLED3_SINK_REG_STR_CABC_MASK, wled->cfg.cabc_en ? - PM8941_WLED_REG_STR_CABC_EN : 0); + WLED3_SINK_REG_STR_CABC_EN : 0); if (rc) return rc; } @@ -194,9 +196,9 @@ static int pm8941_wled_setup(struct pm8941_wled *wled) return 0; }

-static const struct pm8941_wled_config pm8941_wled_config_defaults = { - .i_boost_limit = 3, - .i_limit = 20, +static const struct wled_config wled3_config_defaults = { + .boost_i_limit = 3, + .string_i_limit = 20, .ovp = 2, .switch_freq = 5, .num_strings = 0, @@ -205,55 +207,55 @@ static int pm8941_wled_setup(struct pm8941_wled *wled) .cabc_en = false, };

-struct pm8941_wled_var_cfg { +struct wled_var_cfg { const u32 *values; u32 (*fn)(u32); int size; };

-static const u32 pm8941_wled_i_boost_limit_values[] = { +static const u32 wled3_boost_i_limit_values[] = { 105, 385, 525, 805, 980, 1260, 1400, 1680, };

-static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = { - .values = pm8941_wled_i_boost_limit_values, - .size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values), +static const struct wled_var_cfg wled3_boost_i_limit_cfg = { + .values = wled3_boost_i_limit_values, + .size = ARRAY_SIZE(wled3_boost_i_limit_values), };

-static const u32 pm8941_wled_ovp_values[] = { +static const u32 wled3_ovp_values[] = { 35, 32, 29, 27, };

-static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = { - .values = pm8941_wled_ovp_values, - .size = ARRAY_SIZE(pm8941_wled_ovp_values), +static const struct wled_var_cfg wled3_ovp_cfg = { + .values = wled3_ovp_values, + .size = ARRAY_SIZE(wled3_ovp_values), };

-static u32 pm8941_wled_num_strings_values_fn(u32 idx) +static u32 wled3_num_strings_values_fn(u32 idx) { return idx + 1; }

-static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = { - .fn = pm8941_wled_num_strings_values_fn, +static const struct wled_var_cfg wled3_num_strings_cfg = { + .fn = wled3_num_strings_values_fn, .size = 3, };

-static u32 pm8941_wled_switch_freq_values_fn(u32 idx) +static u32 wled3_switch_freq_values_fn(u32 idx) { return 19200 / (2 * (1 + idx)); }

-static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = { - .fn = pm8941_wled_switch_freq_values_fn, +static const struct wled_var_cfg wled3_switch_freq_cfg = { + .fn = wled3_switch_freq_values_fn, .size = 16, };

-static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = { +static const struct wled_var_cfg wled3_string_i_limit_cfg = { .size = 26, };

-static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx) +static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx) { if (idx >= cfg->size) return UINT_MAX; @@ -264,9 +266,9 @@ static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx) return idx; }

-static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) +static int wled_configure(struct wled *wled, struct device *dev) { - struct pm8941_wled_config *cfg = &wled->cfg; + struct wled_config *cfg = &wled->cfg; u32 val; int rc; u32 c; @@ -276,32 +278,32 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) const struct { const char *name; u32 *val_ptr; - const struct pm8941_wled_var_cfg *cfg; + const struct wled_var_cfg *cfg; } u32_opts[] = { { "qcom,current-boost-limit", - &cfg->i_boost_limit, - .cfg = &pm8941_wled_i_boost_limit_cfg, + &cfg->boost_i_limit, + .cfg = &wled3_boost_i_limit_cfg, }, { "qcom,current-limit", - &cfg->i_limit, - .cfg = &pm8941_wled_i_limit_cfg, + &cfg->string_i_limit, + .cfg = &wled3_string_i_limit_cfg, }, { "qcom,ovp", &cfg->ovp, - .cfg = &pm8941_wled_ovp_cfg, + .cfg = &wled3_ovp_cfg, }, { "qcom,switching-freq", &cfg->switch_freq, - .cfg = &pm8941_wled_switch_freq_cfg, + .cfg = &wled3_switch_freq_cfg, }, { "qcom,num-strings", &cfg->num_strings, - .cfg = &pm8941_wled_num_strings_cfg, + .cfg = &wled3_num_strings_cfg, }, }; const struct { @@ -324,7 +326,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) if (rc) wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);

- *cfg = pm8941_wled_config_defaults; + *cfg = wled3_config_defaults; for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) { rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val); if (rc == -EINVAL) { @@ -336,7 +338,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)

c = UINT_MAX; for (j = 0; c != val; j++) { - c = pm8941_wled_values(u32_opts[i].cfg, j); + c = wled3_values(u32_opts[i].cfg, j); if (c == UINT_MAX) { dev_err(dev, "invalid value for '%s'\n", u32_opts[i].name); @@ -358,15 +360,15 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) return 0; }

-static const struct backlight_ops pm8941_wled_ops = { - .update_status = pm8941_wled_update_status, +static const struct backlight_ops wled_ops = { + .update_status = wled_update_status, };

-static int pm8941_wled_probe(struct platform_device *pdev) +static int wled_probe(struct platform_device *pdev) { struct backlight_properties props; struct backlight_device *bl; - struct pm8941_wled *wled; + struct wled *wled; struct regmap *regmap; u32 val; int rc; @@ -383,42 +385,42 @@ static int pm8941_wled_probe(struct platform_device *pdev)

wled->regmap = regmap;

- rc = pm8941_wled_configure(wled, &pdev->dev); + rc = wled_configure(wled, &pdev->dev); if (rc) return rc;

- rc = pm8941_wled_setup(wled); + rc = wled_setup(wled); if (rc) return rc;

- val = PM8941_WLED_DEFAULT_BRIGHTNESS; + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);

memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.brightness = val; - props.max_brightness = PM8941_WLED_REG_VAL_MAX; + props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX; bl = devm_backlight_device_register(&pdev->dev, wled->name, &pdev->dev, wled, - &pm8941_wled_ops, &props); + &wled_ops, &props); return PTR_ERR_OR_ZERO(bl); };

-static const struct of_device_id pm8941_wled_match_table[] = { +static const struct of_device_id wled_match_table[] = { { .compatible = "qcom,pm8941-wled" }, {} }; -MODULE_DEVICE_TABLE(of, pm8941_wled_match_table); +MODULE_DEVICE_TABLE(of, wled_match_table);

-static struct platform_driver pm8941_wled_driver = { - .probe = pm8941_wled_probe, +static struct platform_driver wled_driver = { + .probe = wled_probe, .driver = { - .name = "pm8941-wled", - .of_match_table = pm8941_wled_match_table, + .name = "qcom,wled", + .of_match_table = wled_match_table, }, };

-module_platform_driver(pm8941_wled_driver); +module_platform_driver(wled_driver);

-MODULE_DESCRIPTION("pm8941 wled driver"); +MODULE_DESCRIPTION("Qualcomm WLED driver"); MODULE_LICENSE("GPL v2");

Restructure the driver to add the support for new WLED peripherals.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Acked-by: Daniel Thompson daniel.thompson@linaro.org --- drivers/video/backlight/qcom-wled.c | 373 ++++++++++++++++++++++-------------- 1 file changed, 234 insertions(+), 139 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index f191242..45eeda4 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -7,59 +7,71 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/of_address.h> #include <linux/regmap.h>

/* From DT binding */ +#define WLED_MAX_STRINGS 4 + #define WLED_DEFAULT_BRIGHTNESS 2048

#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF -#define WLED3_CTRL_REG_VAL_BASE 0x40

/* WLED3 control registers */ #define WLED3_CTRL_REG_MOD_EN 0x46 -#define WLED3_CTRL_REG_MOD_EN_BIT BIT(7) #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) +#define WLED3_CTRL_REG_MOD_EN_SHIFT 7

#define WLED3_CTRL_REG_FREQ 0x4c -#define WLED3_CTRL_REG_FREQ_MASK 0x0f +#define WLED3_CTRL_REG_FREQ_MASK GENMASK(3, 0)

#define WLED3_CTRL_REG_OVP 0x4d -#define WLED3_CTRL_REG_OVP_MASK 0x03 +#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0)

#define WLED3_CTRL_REG_ILIMIT 0x4e -#define WLED3_CTRL_REG_ILIMIT_MASK 0x07 +#define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0)

/* WLED3 sink registers */ #define WLED3_SINK_REG_SYNC 0x47 -#define WLED3_SINK_REG_SYNC_MASK 0x07 -#define WLED3_SINK_REG_SYNC_LED1 BIT(0) -#define WLED3_SINK_REG_SYNC_LED2 BIT(1) -#define WLED3_SINK_REG_SYNC_LED3 BIT(2) -#define WLED3_SINK_REG_SYNC_ALL 0x07 #define WLED3_SINK_REG_SYNC_CLEAR 0x00

#define WLED3_SINK_REG_CURR_SINK 0x4f -#define WLED3_SINK_REG_CURR_SINK_MASK 0xe0 -#define WLED3_SINK_REG_CURR_SINK_SHFT 0x05 +#define WLED3_SINK_REG_CURR_SINK_MASK GENMASK(7, 5) +#define WLED3_SINK_REG_CURR_SINK_SHFT 5

-/* WLED3 per-'string' registers below */ -#define WLED3_SINK_REG_STR_OFFSET 0x10 +/* WLED3 specific per-'string' registers below */ +#define WLED3_SINK_REG_BRIGHT(n) (0x40 + n)

-#define WLED3_SINK_REG_STR_MOD_EN_BASE 0x60 +#define WLED3_SINK_REG_STR_MOD_EN(n) (0x60 + (n * 0x10)) #define WLED3_SINK_REG_STR_MOD_MASK BIT(7) -#define WLED3_SINK_REG_STR_MOD_EN BIT(7)

-#define WLED3_SINK_REG_STR_FULL_SCALE_CURR 0x62 -#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK 0x1f +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR(n) (0x62 + (n * 0x10)) +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(4, 0)

-#define WLED3_SINK_REG_STR_MOD_SRC_BASE 0x63 -#define WLED3_SINK_REG_STR_MOD_SRC_MASK 0x01 +#define WLED3_SINK_REG_STR_MOD_SRC(n) (0x63 + (n * 0x10)) +#define WLED3_SINK_REG_STR_MOD_SRC_MASK BIT(0) #define WLED3_SINK_REG_STR_MOD_SRC_INT 0x00 #define WLED3_SINK_REG_STR_MOD_SRC_EXT 0x01

-#define WLED3_SINK_REG_STR_CABC_BASE 0x66 +#define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) #define WLED3_SINK_REG_STR_CABC_MASK BIT(7) -#define WLED3_SINK_REG_STR_CABC_EN BIT(7) + +struct wled_var_cfg { + const u32 *values; + u32 (*fn)(u32); + int size; +}; + +struct wled_u32_opts { + const char *name; + u32 *val_ptr; + const struct wled_var_cfg *cfg; +}; + +struct wled_bool_opts { + const char *name; + bool *val_ptr; +};

struct wled_config { u32 boost_i_limit; @@ -67,132 +79,179 @@ struct wled_config { u32 switch_freq; u32 num_strings; u32 string_i_limit; + u32 enabled_strings[WLED_MAX_STRINGS]; bool cs_out_en; bool ext_gen; - bool cabc_en; + bool cabc; };

struct wled { const char *name; + struct device *dev; struct regmap *regmap; - u16 addr; + u16 ctrl_addr; + u16 max_string_count; + u32 brightness; + u32 max_brightness;

struct wled_config cfg; + int (*wled_set_brightness)(struct wled *wled, u16 brightness); };

+static int wled3_set_brightness(struct wled *wled, u16 brightness) +{ + int rc, i; + u8 v[2]; + + v[0] = brightness & 0xff; + v[1] = (brightness >> 8) & 0xf; + + for (i = 0; i < wled->cfg.num_strings; ++i) { + rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr + + WLED3_SINK_REG_BRIGHT(i), v, 2); + if (rc < 0) + return rc; + } + + return 0; +} + +static int wled_module_enable(struct wled *wled, int val) +{ + int rc; + + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, + val << WLED3_CTRL_REG_MOD_EN_SHIFT); + return rc; +} + +static int wled_sync_toggle(struct wled *wled) +{ + int rc; + unsigned int mask = GENMASK(wled->max_string_count - 1, 0); + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_SINK_REG_SYNC, + mask, mask); + if (rc < 0) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_SINK_REG_SYNC, + mask, WLED3_SINK_REG_SYNC_CLEAR); + + return rc; +} + static int wled_update_status(struct backlight_device *bl) { struct wled *wled = bl_get_data(bl); - u16 val = bl->props.brightness; - u8 ctrl = 0; - int rc; - int i; + u16 brightness = bl->props.brightness; + int rc = 0;

if (bl->props.power != FB_BLANK_UNBLANK || bl->props.fb_blank != FB_BLANK_UNBLANK || bl->props.state & BL_CORE_FBBLANK) - val = 0; - - if (val != 0) - ctrl = WLED3_CTRL_REG_MOD_EN_BIT; + brightness = 0;

- rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_CTRL_REG_MOD_EN, - WLED3_CTRL_REG_MOD_EN_MASK, ctrl); - if (rc) - return rc; + if (brightness) { + rc = wled->wled_set_brightness(wled, brightness); + if (rc < 0) { + dev_err(wled->dev, "wled failed to set brightness rc:%d\n", + rc); + return rc; + }

- for (i = 0; i < wled->cfg.num_strings; ++i) { - u8 v[2] = { val & 0xff, (val >> 8) & 0xf }; + rc = wled_sync_toggle(wled); + if (rc < 0) { + dev_err(wled->dev, "wled sync failed rc:%d\n", rc); + return rc; + } + }

- rc = regmap_bulk_write(wled->regmap, - wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i, - v, 2); - if (rc) + if (!!brightness != !!wled->brightness) { + rc = wled_module_enable(wled, !!brightness); + if (rc < 0) { + dev_err(wled->dev, "wled enable failed rc:%d\n", rc); return rc; + } }

- rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_SINK_REG_SYNC, - WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL); - if (rc) - return rc; + wled->brightness = brightness;

- rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_SINK_REG_SYNC, - WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR); return rc; }

-static int wled_setup(struct wled *wled) +static int wled3_setup(struct wled *wled) { - int rc; - int i; + u16 addr; + u8 sink_en = 0; + int rc, i, j;

rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_CTRL_REG_OVP, - WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp); + wled->ctrl_addr + WLED3_CTRL_REG_OVP, + WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp); if (rc) return rc;

rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_CTRL_REG_ILIMIT, - WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit); + wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT, + WLED3_CTRL_REG_ILIMIT_MASK, + wled->cfg.boost_i_limit); if (rc) return rc;

rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_CTRL_REG_FREQ, - WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq); + wled->ctrl_addr + WLED3_CTRL_REG_FREQ, + WLED3_CTRL_REG_FREQ_MASK, + wled->cfg.switch_freq); if (rc) return rc;

- if (wled->cfg.cs_out_en) { - u8 all = (BIT(wled->cfg.num_strings) - 1) - << WLED3_SINK_REG_CURR_SINK_SHFT; - - rc = regmap_update_bits(wled->regmap, - wled->addr + WLED3_SINK_REG_CURR_SINK, - WLED3_SINK_REG_CURR_SINK_MASK, all); - if (rc) - return rc; - } - for (i = 0; i < wled->cfg.num_strings; ++i) { - u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i; - - rc = regmap_update_bits(wled->regmap, - addr + WLED3_SINK_REG_STR_MOD_EN_BASE, - WLED3_SINK_REG_STR_MOD_MASK, - WLED3_SINK_REG_STR_MOD_EN); + j = wled->cfg.enabled_strings[i]; + addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED3_SINK_REG_STR_MOD_MASK, + WLED3_SINK_REG_STR_MOD_MASK); if (rc) return rc;

if (wled->cfg.ext_gen) { - rc = regmap_update_bits(wled->regmap, - addr + WLED3_SINK_REG_STR_MOD_SRC_BASE, - WLED3_SINK_REG_STR_MOD_SRC_MASK, - WLED3_SINK_REG_STR_MOD_SRC_EXT); + addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED3_SINK_REG_STR_MOD_SRC_MASK, + WLED3_SINK_REG_STR_MOD_SRC_EXT); if (rc) return rc; }

- rc = regmap_update_bits(wled->regmap, - addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR, - WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK, - wled->cfg.string_i_limit); + addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK, + wled->cfg.string_i_limit); if (rc) return rc;

- rc = regmap_update_bits(wled->regmap, - addr + WLED3_SINK_REG_STR_CABC_BASE, - WLED3_SINK_REG_STR_CABC_MASK, - wled->cfg.cabc_en ? - WLED3_SINK_REG_STR_CABC_EN : 0); + addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED3_SINK_REG_STR_CABC_MASK, + wled->cfg.cabc ? + WLED3_SINK_REG_STR_CABC_MASK : 0); if (rc) return rc; + + sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT); }

+ rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK, + WLED3_SINK_REG_CURR_SINK_MASK, sink_en); + if (rc) + return rc; + return 0; }

@@ -200,17 +259,12 @@ static int wled_setup(struct wled *wled) .boost_i_limit = 3, .string_i_limit = 20, .ovp = 2, + .num_strings = 3, .switch_freq = 5, - .num_strings = 0, .cs_out_en = false, .ext_gen = false, - .cabc_en = false, -}; - -struct wled_var_cfg { - const u32 *values; - u32 (*fn)(u32); - int size; + .cabc = false, + .enabled_strings = {0, 1, 2, 3}, };

static const u32 wled3_boost_i_limit_values[] = { @@ -255,7 +309,11 @@ static u32 wled3_switch_freq_values_fn(u32 idx) .size = 26, };

-static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx) +static const struct wled_var_cfg wled3_string_cfg = { + .size = 8, +}; + +static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx) { if (idx >= cfg->size) return UINT_MAX; @@ -266,68 +324,75 @@ static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx) return idx; }

-static int wled_configure(struct wled *wled, struct device *dev) +static int wled_configure(struct wled *wled, int version) { struct wled_config *cfg = &wled->cfg; - u32 val; - int rc; - u32 c; - int i; - int j; - - const struct { - const char *name; - u32 *val_ptr; - const struct wled_var_cfg *cfg; - } u32_opts[] = { + struct device *dev = wled->dev; + const __be32 *prop_addr; + u32 size, val, c, string_len; + int rc, i, j; + + const struct wled_u32_opts *u32_opts = NULL; + const struct wled_u32_opts wled3_opts[] = { { - "qcom,current-boost-limit", - &cfg->boost_i_limit, + .name = "qcom,current-boost-limit", + .val_ptr = &cfg->boost_i_limit, .cfg = &wled3_boost_i_limit_cfg, }, { - "qcom,current-limit", - &cfg->string_i_limit, + .name = "qcom,current-limit", + .val_ptr = &cfg->string_i_limit, .cfg = &wled3_string_i_limit_cfg, }, { - "qcom,ovp", - &cfg->ovp, + .name = "qcom,ovp", + .val_ptr = &cfg->ovp, .cfg = &wled3_ovp_cfg, }, { - "qcom,switching-freq", - &cfg->switch_freq, + .name = "qcom,switching-freq", + .val_ptr = &cfg->switch_freq, .cfg = &wled3_switch_freq_cfg, }, { - "qcom,num-strings", - &cfg->num_strings, + .name = "qcom,num-strings", + .val_ptr = &cfg->num_strings, .cfg = &wled3_num_strings_cfg, }, }; - const struct { - const char *name; - bool *val_ptr; - } bool_opts[] = { + + const struct wled_bool_opts bool_opts[] = { { "qcom,cs-out", &cfg->cs_out_en, }, { "qcom,ext-gen", &cfg->ext_gen, }, - { "qcom,cabc", &cfg->cabc_en, }, + { "qcom,cabc", &cfg->cabc, }, };

- rc = of_property_read_u32(dev->of_node, "reg", &val); - if (rc || val > 0xffff) { - dev_err(dev, "invalid IO resources\n"); - return rc ? rc : -EINVAL; + prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); + if (!prop_addr) { + dev_err(wled->dev, "invalid IO resources\n"); + return -EINVAL; } - wled->addr = val; + wled->ctrl_addr = be32_to_cpu(*prop_addr);

rc = of_property_read_string(dev->of_node, "label", &wled->name); if (rc) wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);

- *cfg = wled3_config_defaults; - for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) { + switch (version) { + case 3: + u32_opts = wled3_opts; + size = ARRAY_SIZE(wled3_opts); + *cfg = wled3_config_defaults; + wled->wled_set_brightness = wled3_set_brightness; + wled->max_string_count = 3; + break; + + default: + dev_err(wled->dev, "Invalid WLED version\n"); + return -EINVAL; + } + + for (i = 0; i < size; ++i) { rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val); if (rc == -EINVAL) { continue; @@ -338,12 +403,15 @@ static int wled_configure(struct wled *wled, struct device *dev)

c = UINT_MAX; for (j = 0; c != val; j++) { - c = wled3_values(u32_opts[i].cfg, j); + c = wled_values(u32_opts[i].cfg, j); if (c == UINT_MAX) { dev_err(dev, "invalid value for '%s'\n", u32_opts[i].name); return -EINVAL; } + + if (c == val) + break; }

dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c); @@ -357,6 +425,15 @@ static int wled_configure(struct wled *wled, struct device *dev)

cfg->num_strings = cfg->num_strings + 1;

+ string_len = of_property_count_elems_of_size(dev->of_node, + "qcom,enabled-strings", + sizeof(u32)); + if (string_len > 0) + of_property_read_u32_array(dev->of_node, + "qcom,enabled-strings", + wled->cfg.enabled_strings, + sizeof(u32)); + return 0; }

@@ -370,6 +447,7 @@ static int wled_probe(struct platform_device *pdev) struct backlight_device *bl; struct wled *wled; struct regmap *regmap; + int version; u32 val; int rc;

@@ -384,15 +462,32 @@ static int wled_probe(struct platform_device *pdev) return -ENOMEM;

wled->regmap = regmap; + wled->dev = &pdev->dev;

- rc = wled_configure(wled, &pdev->dev); - if (rc) - return rc; + version = (uintptr_t)of_device_get_match_data(&pdev->dev); + if (!version) { + dev_err(&pdev->dev, "Unknown device version\n"); + return -ENODEV; + }

- rc = wled_setup(wled); + rc = wled_configure(wled, version); if (rc) return rc;

+ switch (version) { + case 3: + rc = wled3_setup(wled); + if (rc) { + dev_err(&pdev->dev, "wled3_setup failed\n"); + return rc; + } + break; + + default: + dev_err(wled->dev, "Invalid WLED version\n"); + break; + } + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);

@@ -407,7 +502,7 @@ static int wled_probe(struct platform_device *pdev) };

static const struct of_device_id wled_match_table[] = { - { .compatible = "qcom,pm8941-wled" }, + { .compatible = "qcom,pm8941-wled", .data = (void *)3 }, {} }; MODULE_DEVICE_TABLE(of, wled_match_table);

WLED4 peripheral is present on some PMICs like pmi8998 and pm660l. It has a different register map and configurations are also different. Add support for it.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org --- drivers/video/backlight/qcom-wled.c | 255 +++++++++++++++++++++++++++++++++++- 1 file changed, 253 insertions(+), 2 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 45eeda4..5386ca9 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -17,7 +17,7 @@

#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF

-/* WLED3 control registers */ +/* WLED3/WLED4 control registers */ #define WLED3_CTRL_REG_MOD_EN 0x46 #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) #define WLED3_CTRL_REG_MOD_EN_SHIFT 7 @@ -31,7 +31,7 @@ #define WLED3_CTRL_REG_ILIMIT 0x4e #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0)

-/* WLED3 sink registers */ +/* WLED3/WLED4 sink registers */ #define WLED3_SINK_REG_SYNC 0x47 #define WLED3_SINK_REG_SYNC_CLEAR 0x00

@@ -56,6 +56,28 @@ #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) #define WLED3_SINK_REG_STR_CABC_MASK BIT(7)

+/* WLED4 specific sink registers */ +#define WLED4_SINK_REG_CURR_SINK 0x46 +#define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4) +#define WLED4_SINK_REG_CURR_SINK_SHFT 4 + +/* WLED4 specific per-'string' registers below */ +#define WLED4_SINK_REG_STR_MOD_EN(n) (0x50 + (n * 0x10)) +#define WLED4_SINK_REG_STR_MOD_MASK BIT(7) + +#define WLED4_SINK_REG_STR_FULL_SCALE_CURR(n) (0x52 + (n * 0x10)) +#define WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(3, 0) + +#define WLED4_SINK_REG_STR_MOD_SRC(n) (0x53 + (n * 0x10)) +#define WLED4_SINK_REG_STR_MOD_SRC_MASK BIT(0) +#define WLED4_SINK_REG_STR_MOD_SRC_INT 0x00 +#define WLED4_SINK_REG_STR_MOD_SRC_EXT 0x01 + +#define WLED4_SINK_REG_STR_CABC(n) (0x56 + (n * 0x10)) +#define WLED4_SINK_REG_STR_CABC_MASK BIT(7) + +#define WLED4_SINK_REG_BRIGHT(n) (0x57 + (n * 0x10)) + struct wled_var_cfg { const u32 *values; u32 (*fn)(u32); @@ -90,6 +112,7 @@ struct wled { struct device *dev; struct regmap *regmap; u16 ctrl_addr; + u16 sink_addr; u16 max_string_count; u32 brightness; u32 max_brightness; @@ -116,6 +139,29 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness) return 0; }

+static int wled4_set_brightness(struct wled *wled, u16 brightness) +{ + int rc, i; + u16 low_limit = wled->max_brightness * 4 / 1000; + u8 v[2]; + + /* WLED4's lower limit of operation is 0.4% */ + if (brightness > 0 && brightness < low_limit) + brightness = low_limit; + + v[0] = brightness & 0xff; + v[1] = (brightness >> 8) & 0xf; + + for (i = 0; i < wled->cfg.num_strings; ++i) { + rc = regmap_bulk_write(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_BRIGHT(i), v, 2); + if (rc < 0) + return rc; + } + + return 0; +} + static int wled_module_enable(struct wled *wled, int val) { int rc; @@ -267,6 +313,120 @@ static int wled3_setup(struct wled *wled) .enabled_strings = {0, 1, 2, 3}, };

+static int wled4_setup(struct wled *wled) +{ + int rc, temp, i, j; + u16 addr; + u8 sink_en = 0; + u32 sink_cfg = 0; + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_OVP, + WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp); + if (rc < 0) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT, + WLED3_CTRL_REG_ILIMIT_MASK, + wled->cfg.boost_i_limit); + if (rc < 0) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_FREQ, + WLED3_CTRL_REG_FREQ_MASK, + wled->cfg.switch_freq); + if (rc < 0) + return rc; + + rc = regmap_read(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_CURR_SINK, &sink_cfg); + if (rc < 0) + return rc; + + for (i = 0; i < wled->cfg.num_strings; i++) { + j = wled->cfg.enabled_strings[i]; + temp = j + WLED4_SINK_REG_CURR_SINK_SHFT; + sink_en |= 1 << temp; + } + + if (sink_cfg == sink_en) + return 0; + + rc = regmap_update_bits(wled->regmap, + wled->sink_addr + WLED4_SINK_REG_CURR_SINK, + WLED4_SINK_REG_CURR_SINK_MASK, 0); + if (rc < 0) + return rc; + + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, 0); + if (rc < 0) + return rc; + + /* Per sink/string configuration */ + for (i = 0; i < wled->cfg.num_strings; i++) { + j = wled->cfg.enabled_strings[i]; + + addr = wled->sink_addr + + WLED4_SINK_REG_STR_MOD_EN(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED4_SINK_REG_STR_MOD_MASK, + WLED4_SINK_REG_STR_MOD_MASK); + if (rc < 0) + return rc; + + addr = wled->sink_addr + + WLED4_SINK_REG_STR_FULL_SCALE_CURR(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK, + wled->cfg.string_i_limit); + if (rc < 0) + return rc; + + addr = wled->sink_addr + + WLED4_SINK_REG_STR_CABC(j); + rc = regmap_update_bits(wled->regmap, addr, + WLED4_SINK_REG_STR_CABC_MASK, + wled->cfg.cabc ? + WLED4_SINK_REG_STR_CABC_MASK : 0); + if (rc < 0) + return rc; + } + + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, + WLED3_CTRL_REG_MOD_EN_MASK); + if (rc < 0) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->sink_addr + WLED4_SINK_REG_CURR_SINK, + WLED4_SINK_REG_CURR_SINK_MASK, sink_en); + if (rc < 0) + return rc; + + rc = wled_sync_toggle(wled); + if (rc < 0) { + dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc); + return rc; + } + + return 0; +} + +static const struct wled_config wled4_config_defaults = { + .boost_i_limit = 4, + .string_i_limit = 10, + .ovp = 1, + .num_strings = 4, + .switch_freq = 11, + .cabc = false, +}; + static const u32 wled3_boost_i_limit_values[] = { 105, 385, 525, 805, 980, 1260, 1400, 1680, }; @@ -276,6 +436,15 @@ static int wled3_setup(struct wled *wled) .size = ARRAY_SIZE(wled3_boost_i_limit_values), };

+static const u32 wled4_boost_i_limit_values[] = { + 105, 280, 450, 620, 970, 1150, 1300, 1500, +}; + +static const struct wled_var_cfg wled4_boost_i_limit_cfg = { + .values = wled4_boost_i_limit_values, + .size = ARRAY_SIZE(wled4_boost_i_limit_values), +}; + static const u32 wled3_ovp_values[] = { 35, 32, 29, 27, }; @@ -285,6 +454,15 @@ static int wled3_setup(struct wled *wled) .size = ARRAY_SIZE(wled3_ovp_values), };

+static const u32 wled4_ovp_values[] = { + 31100, 29600, 19600, 18100, +}; + +static const struct wled_var_cfg wled4_ovp_cfg = { + .values = wled4_ovp_values, + .size = ARRAY_SIZE(wled4_ovp_values), +}; + static u32 wled3_num_strings_values_fn(u32 idx) { return idx + 1; @@ -295,6 +473,11 @@ static u32 wled3_num_strings_values_fn(u32 idx) .size = 3, };

+static const struct wled_var_cfg wled4_num_strings_cfg = { + .fn = wled3_num_strings_values_fn, + .size = 4, +}; + static u32 wled3_switch_freq_values_fn(u32 idx) { return 19200 / (2 * (1 + idx)); @@ -309,10 +492,24 @@ static u32 wled3_switch_freq_values_fn(u32 idx) .size = 26, };

+static const u32 wled4_string_i_limit_values[] = { + 0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000, + 22500, 25000, 27500, 30000, +}; + +static const struct wled_var_cfg wled4_string_i_limit_cfg = { + .values = wled4_string_i_limit_values, + .size = ARRAY_SIZE(wled4_string_i_limit_values), +}; + static const struct wled_var_cfg wled3_string_cfg = { .size = 8, };

+static const struct wled_var_cfg wled4_string_cfg = { + .size = 16, +}; + static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx) { if (idx >= cfg->size) @@ -361,6 +558,34 @@ static int wled_configure(struct wled *wled, int version) }, };

+ const struct wled_u32_opts wled4_opts[] = { + { + .name = "qcom,current-boost-limit", + .val_ptr = &cfg->boost_i_limit, + .cfg = &wled4_boost_i_limit_cfg, + }, + { + .name = "qcom,current-limit-microamp", + .val_ptr = &cfg->string_i_limit, + .cfg = &wled4_string_i_limit_cfg, + }, + { + .name = "qcom,ovp-millivolt", + .val_ptr = &cfg->ovp, + .cfg = &wled4_ovp_cfg, + }, + { + .name = "qcom,switching-freq", + .val_ptr = &cfg->switch_freq, + .cfg = &wled3_switch_freq_cfg, + }, + { + .name = "qcom,num-strings", + .val_ptr = &cfg->num_strings, + .cfg = &wled4_num_strings_cfg, + }, + }; + const struct wled_bool_opts bool_opts[] = { { "qcom,cs-out", &cfg->cs_out_en, }, { "qcom,ext-gen", &cfg->ext_gen, }, @@ -385,6 +610,22 @@ static int wled_configure(struct wled *wled, int version) *cfg = wled3_config_defaults; wled->wled_set_brightness = wled3_set_brightness; wled->max_string_count = 3; + wled->sink_addr = wled->ctrl_addr; + break; + + case 4: + u32_opts = wled4_opts; + size = ARRAY_SIZE(wled4_opts); + *cfg = wled4_config_defaults; + wled->wled_set_brightness = wled4_set_brightness; + wled->max_string_count = 4; + + prop_addr = of_get_address(dev->of_node, 1, NULL, NULL); + if (!prop_addr) { + dev_err(wled->dev, "invalid IO resources\n"); + return -EINVAL; + } + wled->sink_addr = be32_to_cpu(*prop_addr); break;

default: @@ -483,6 +724,14 @@ static int wled_probe(struct platform_device *pdev) } break;

+ case 4: + rc = wled4_setup(wled); + if (rc) { + dev_err(&pdev->dev, "wled4_setup failed\n"); + return rc; + } + break; + default: dev_err(wled->dev, "Invalid WLED version\n"); break; @@ -503,6 +752,8 @@ static int wled_probe(struct platform_device *pdev)

static const struct of_device_id wled_match_table[] = { { .compatible = "qcom,pm8941-wled", .data = (void *)3 }, + { .compatible = "qcom,pmi8998-wled", .data = (void *)4 }, + { .compatible = "qcom,pm660l-wled", .data = (void *)4 }, {} }; MODULE_DEVICE_TABLE(of, wled_match_table);

Handle the short circuit interrupt and check if the short circuit interrupt is valid. Re-enable the module to check if it goes away. Disable the module altogether if the short circuit event persists.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org --- drivers/video/backlight/qcom-wled.c | 144 +++++++++++++++++++++++++++++++++++- 1 file changed, 140 insertions(+), 4 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 5386ca9..658b1e0 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -2,6 +2,9 @@ /* Copyright (c) 2015, Sony Mobile Communications, AB. */

+#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/ktime.h> #include <linux/kernel.h> #include <linux/backlight.h> #include <linux/module.h> @@ -56,6 +59,16 @@ #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) #define WLED3_SINK_REG_STR_CABC_MASK BIT(7)

+/* WLED4 specific control registers */ +#define WLED4_CTRL_REG_SHORT_PROTECT 0x5e +#define WLED4_CTRL_REG_SHORT_EN_MASK BIT(7) + +#define WLED4_CTRL_REG_SEC_ACCESS 0xd0 +#define WLED4_CTRL_REG_SEC_UNLOCK 0xa5 + +#define WLED4_CTRL_REG_TEST1 0xe2 +#define WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2 0x09 + /* WLED4 specific sink registers */ #define WLED4_SINK_REG_CURR_SINK 0x46 #define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4) @@ -105,17 +118,24 @@ struct wled_config { bool cs_out_en; bool ext_gen; bool cabc; + bool external_pfet; };

struct wled { const char *name; struct device *dev; struct regmap *regmap; + struct mutex lock; /* Lock to avoid race from thread irq handler */ + ktime_t last_short_event; u16 ctrl_addr; u16 sink_addr; u16 max_string_count; u32 brightness; u32 max_brightness; + u32 short_count; + bool disabled_by_short; + bool has_short_detect; + int short_irq;

struct wled_config cfg; int (*wled_set_brightness)(struct wled *wled, u16 brightness); @@ -166,6 +186,9 @@ static int wled_module_enable(struct wled *wled, int val) { int rc;

+ if (wled->disabled_by_short) + return -ENXIO; + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, WLED3_CTRL_REG_MOD_EN_MASK, @@ -202,18 +225,19 @@ static int wled_update_status(struct backlight_device *bl) bl->props.state & BL_CORE_FBBLANK) brightness = 0;

+ mutex_lock(&wled->lock); if (brightness) { rc = wled->wled_set_brightness(wled, brightness); if (rc < 0) { dev_err(wled->dev, "wled failed to set brightness rc:%d\n", rc); - return rc; + goto unlock_mutex; }

rc = wled_sync_toggle(wled); if (rc < 0) { dev_err(wled->dev, "wled sync failed rc:%d\n", rc); - return rc; + goto unlock_mutex; } }

@@ -221,15 +245,61 @@ static int wled_update_status(struct backlight_device *bl) rc = wled_module_enable(wled, !!brightness); if (rc < 0) { dev_err(wled->dev, "wled enable failed rc:%d\n", rc); - return rc; + goto unlock_mutex; } }

wled->brightness = brightness;

+unlock_mutex: + mutex_unlock(&wled->lock); + return rc; }

+#define WLED_SHORT_DLY_MS 20 +#define WLED_SHORT_CNT_MAX 5 +#define WLED_SHORT_RESET_CNT_DLY_US USEC_PER_SEC + +static irqreturn_t wled_short_irq_handler(int irq, void *_wled) +{ + struct wled *wled = _wled; + int rc; + s64 elapsed_time; + + wled->short_count++; + mutex_lock(&wled->lock); + rc = wled_module_enable(wled, false); + if (rc < 0) { + dev_err(wled->dev, "wled disable failed rc:%d\n", rc); + goto unlock_mutex; + } + + elapsed_time = ktime_us_delta(ktime_get(), + wled->last_short_event); + if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US) + wled->short_count = 1; + + if (wled->short_count > WLED_SHORT_CNT_MAX) { + dev_err(wled->dev, "Short trigged %d times, disabling WLED forever!\n", + wled->short_count); + wled->disabled_by_short = true; + goto unlock_mutex; + } + + wled->last_short_event = ktime_get(); + + msleep(WLED_SHORT_DLY_MS); + rc = wled_module_enable(wled, true); + if (rc < 0) + dev_err(wled->dev, "wled enable failed rc:%d\n", rc); + +unlock_mutex: + mutex_unlock(&wled->lock); + + return IRQ_HANDLED; +} + static int wled3_setup(struct wled *wled) { u16 addr; @@ -318,7 +388,7 @@ static int wled4_setup(struct wled *wled) int rc, temp, i, j; u16 addr; u8 sink_en = 0; - u32 sink_cfg = 0; + u32 sink_cfg;

rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED3_CTRL_REG_OVP, @@ -340,6 +410,21 @@ static int wled4_setup(struct wled *wled) if (rc < 0) return rc;

+ if (wled->cfg.external_pfet) { + /* Unlock the secure register access */ + rc = regmap_write(wled->regmap, wled->ctrl_addr + + WLED4_CTRL_REG_SEC_ACCESS, + WLED4_CTRL_REG_SEC_UNLOCK); + if (rc < 0) + return rc; + + rc = regmap_write(wled->regmap, + wled->ctrl_addr + WLED4_CTRL_REG_TEST1, + WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2); + if (rc < 0) + return rc; + } + rc = regmap_read(wled->regmap, wled->sink_addr + WLED4_SINK_REG_CURR_SINK, &sink_cfg); if (rc < 0) @@ -425,6 +510,7 @@ static int wled4_setup(struct wled *wled) .num_strings = 4, .switch_freq = 11, .cabc = false, + .external_pfet = false, };

static const u32 wled3_boost_i_limit_values[] = { @@ -590,6 +676,7 @@ static int wled_configure(struct wled *wled, int version) { "qcom,cs-out", &cfg->cs_out_en, }, { "qcom,ext-gen", &cfg->ext_gen, }, { "qcom,cabc", &cfg->cabc, }, + { "qcom,external-pfet", &cfg->external_pfet, }, };

prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); @@ -678,6 +765,38 @@ static int wled_configure(struct wled *wled, int version) return 0; }

+static int wled_configure_short_irq(struct wled *wled, + struct platform_device *pdev) +{ + int rc; + + if (!wled->has_short_detect) + return 0; + + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED4_CTRL_REG_SHORT_PROTECT, + WLED4_CTRL_REG_SHORT_EN_MASK, + WLED4_CTRL_REG_SHORT_EN_MASK); + if (rc < 0) + return rc; + + wled->short_irq = platform_get_irq_byname(pdev, "short"); + if (wled->short_irq < 0) { + dev_dbg(&pdev->dev, "short irq is not used\n"); + return 0; + } + + rc = devm_request_threaded_irq(wled->dev, wled->short_irq, + NULL, wled_short_irq_handler, + IRQF_ONESHOT, + "wled_short_irq", wled); + if (rc < 0) + dev_err(wled->dev, "Unable to request short_irq (err:%d)\n", + rc); + + return rc; +} + static const struct backlight_ops wled_ops = { .update_status = wled_update_status, }; @@ -711,6 +830,7 @@ static int wled_probe(struct platform_device *pdev) return -ENODEV; }

+ mutex_init(&wled->lock); rc = wled_configure(wled, version); if (rc) return rc; @@ -725,6 +845,7 @@ static int wled_probe(struct platform_device *pdev) break;

case 4: + wled->has_short_detect = true; rc = wled4_setup(wled); if (rc) { dev_err(&pdev->dev, "wled4_setup failed\n"); @@ -737,6 +858,10 @@ static int wled_probe(struct platform_device *pdev) break; }

+ rc = wled_configure_short_irq(wled, pdev); + if (rc < 0) + return rc; + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);

@@ -750,6 +875,16 @@ static int wled_probe(struct platform_device *pdev) return PTR_ERR_OR_ZERO(bl); };

+static int wled_remove(struct platform_device *pdev) +{ + struct wled *wled = dev_get_drvdata(&pdev->dev); + + mutex_destroy(&wled->lock); + disable_irq(wled->short_irq); + + return 0; +} + static const struct of_device_id wled_match_table[] = { { .compatible = "qcom,pm8941-wled", .data = (void *)3 }, { .compatible = "qcom,pmi8998-wled", .data = (void *)4 }, @@ -760,6 +895,7 @@ static int wled_probe(struct platform_device *pdev)

static struct platform_driver wled_driver = { .probe = wled_probe, + .remove = wled_remove, .driver = { .name = "qcom,wled", .of_match_table = wled_match_table,

The auto string detection algorithm checks if the current WLED sink configuration is valid. It tries enabling every sink and checks if the OVP fault is observed. Based on this information it detects and enables the valid sink configuration. Auto calibration will be triggered when the OVP fault interrupts are seen frequently thereby it tries to fix the sink configuration.

The auto-detection also kicks in when the connected LED string of the display-backlight malfunctions (because of damage) and requires the damaged string to be turned off to prevent the complete panel and/or board from being damaged.

Signed-off-by: Kiran Gunda kgunda@codeaurora.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org --- drivers/video/backlight/qcom-wled.c | 400 +++++++++++++++++++++++++++++++++++- 1 file changed, 394 insertions(+), 6 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 658b1e0..33b6007 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -17,19 +17,29 @@ #define WLED_MAX_STRINGS 4

#define WLED_DEFAULT_BRIGHTNESS 2048 - +#define WLED_SOFT_START_DLY_US 10000 #define WLED3_SINK_REG_BRIGHT_MAX 0xFFF

/* WLED3/WLED4 control registers */ +#define WLED3_CTRL_REG_FAULT_STATUS 0x08 +#define WLED3_CTRL_REG_ILIM_FAULT_BIT BIT(0) +#define WLED3_CTRL_REG_OVP_FAULT_BIT BIT(1) +#define WLED4_CTRL_REG_SC_FAULT_BIT BIT(2) + +#define WLED3_CTRL_REG_INT_RT_STS 0x10 +#define WLED3_CTRL_REG_OVP_FAULT_STATUS BIT(1) + #define WLED3_CTRL_REG_MOD_EN 0x46 #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) #define WLED3_CTRL_REG_MOD_EN_SHIFT 7

+#define WLED3_CTRL_REG_FEEDBACK_CONTROL 0x48 + #define WLED3_CTRL_REG_FREQ 0x4c #define WLED3_CTRL_REG_FREQ_MASK GENMASK(3, 0)

#define WLED3_CTRL_REG_OVP 0x4d -#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0) +#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0)

#define WLED3_CTRL_REG_ILIMIT 0x4e #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0) @@ -119,6 +129,7 @@ struct wled_config { bool ext_gen; bool cabc; bool external_pfet; + bool auto_detection_enabled; };

struct wled { @@ -127,17 +138,22 @@ struct wled { struct regmap *regmap; struct mutex lock; /* Lock to avoid race from thread irq handler */ ktime_t last_short_event; + ktime_t start_ovp_fault_time; u16 ctrl_addr; u16 sink_addr; u16 max_string_count; + u16 auto_detection_ovp_count; u32 brightness; u32 max_brightness; u32 short_count; + u32 auto_detect_count; bool disabled_by_short; bool has_short_detect; int short_irq; + int ovp_irq;

struct wled_config cfg; + struct delayed_work ovp_work; int (*wled_set_brightness)(struct wled *wled, u16 brightness); };

@@ -182,6 +198,13 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness) return 0; }

+static void wled_ovp_work(struct work_struct *work) +{ + struct wled *wled = container_of(work, + struct wled, ovp_work.work); + enable_irq(wled->ovp_irq); +} + static int wled_module_enable(struct wled *wled, int val) { int rc; @@ -193,7 +216,25 @@ static int wled_module_enable(struct wled *wled, int val) WLED3_CTRL_REG_MOD_EN, WLED3_CTRL_REG_MOD_EN_MASK, val << WLED3_CTRL_REG_MOD_EN_SHIFT); - return rc; + if (rc < 0) + return rc; + + if (wled->ovp_irq > 0) { + if (val) { + /* + * The hardware generates a storm of spurious OVP + * interrupts during soft start operations. So defer + * enabling the IRQ for 10ms to ensure that the + * soft start is complete. + */ + schedule_delayed_work(&wled->ovp_work, HZ / 100); + } else { + if (!cancel_delayed_work_sync(&wled->ovp_work)) + disable_irq(wled->ovp_irq); + } + } + + return 0; }

static int wled_sync_toggle(struct wled *wled) @@ -300,6 +341,304 @@ static irqreturn_t wled_short_irq_handler(int irq, void *_wled) return IRQ_HANDLED; }

+#define AUTO_DETECT_BRIGHTNESS 200 + +static void wled_auto_string_detection(struct wled *wled) +{ + int rc = 0, i; + u32 sink_config = 0, int_sts; + u8 sink_test = 0, sink_valid = 0, val; + + /* Read configured sink configuration */ + rc = regmap_read(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_CURR_SINK, &sink_config); + if (rc < 0) { + dev_err(wled->dev, "Failed to read SINK configuration rc=%d\n", + rc); + goto failed_detect; + } + + /* Disable the module before starting detection */ + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", rc); + goto failed_detect; + } + + /* Set low brightness across all sinks */ + rc = wled4_set_brightness(wled, AUTO_DETECT_BRIGHTNESS); + if (rc < 0) { + dev_err(wled->dev, "Failed to set brightness for auto detection rc=%d\n", + rc); + goto failed_detect; + } + + if (wled->cfg.cabc) { + for (i = 0; i < wled->cfg.num_strings; i++) { + rc = regmap_update_bits(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_STR_CABC(i), + WLED4_SINK_REG_STR_CABC_MASK, + 0); + if (rc < 0) + goto failed_detect; + } + } + + /* Disable all sinks */ + rc = regmap_write(wled->regmap, + wled->sink_addr + WLED4_SINK_REG_CURR_SINK, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to disable all sinks rc=%d\n", rc); + goto failed_detect; + } + + /* Iterate through the strings one by one */ + for (i = 0; i < wled->cfg.num_strings; i++) { + sink_test = BIT((WLED4_SINK_REG_CURR_SINK_SHFT + i)); + + /* Enable feedback control */ + rc = regmap_write(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_FEEDBACK_CONTROL, i + 1); + if (rc < 0) { + dev_err(wled->dev, "Failed to enable feedback for SINK %d rc = %d\n", + i + 1, rc); + goto failed_detect; + } + + /* Enable the sink */ + rc = regmap_write(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_CURR_SINK, sink_test); + if (rc < 0) { + dev_err(wled->dev, "Failed to configure SINK %d rc=%d\n", + i + 1, rc); + goto failed_detect; + } + + /* Enable the module */ + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, + WLED3_CTRL_REG_MOD_EN_MASK); + if (rc < 0) { + dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", + rc); + goto failed_detect; + } + + usleep_range(WLED_SOFT_START_DLY_US, + WLED_SOFT_START_DLY_US + 1000); + + rc = regmap_read(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_INT_RT_STS, &int_sts); + if (rc < 0) { + dev_err(wled->dev, "Error in reading WLED3_CTRL_INT_RT_STS rc=%d\n", + rc); + goto failed_detect; + } + + if (int_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS) + dev_dbg(wled->dev, "WLED OVP fault detected with SINK %d\n", + i + 1); + else + sink_valid |= sink_test; + + /* Disable the module */ + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", + rc); + goto failed_detect; + } + } + + if (!sink_valid) { + dev_err(wled->dev, "No valid WLED sinks found\n"); + wled->disabled_by_short = true; + goto failed_detect; + } + + if (sink_valid != sink_config) { + dev_warn(wled->dev, "%x is not a valid sink configuration - using %x instead\n", + sink_config, sink_valid); + sink_config = sink_valid; + } + + /* Write the new sink configuration */ + rc = regmap_write(wled->regmap, + wled->sink_addr + WLED4_SINK_REG_CURR_SINK, + sink_config); + if (rc < 0) { + dev_err(wled->dev, "Failed to reconfigure the default sink rc=%d\n", + rc); + goto failed_detect; + } + + /* Enable valid sinks */ + for (i = 0; i < wled->cfg.num_strings; i++) { + if (wled->cfg.cabc) { + rc = regmap_update_bits(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_STR_CABC(i), + WLED4_SINK_REG_STR_CABC_MASK, + WLED4_SINK_REG_STR_CABC_MASK); + if (rc < 0) + goto failed_detect; + } + + if (sink_config & BIT(WLED4_SINK_REG_CURR_SINK_SHFT + i)) + val = WLED4_SINK_REG_STR_MOD_MASK; + else + val = 0x0; /* Disable modulator_en for unused sink */ + + rc = regmap_write(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_STR_MOD_EN(i), val); + if (rc < 0) { + dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n", + rc); + goto failed_detect; + } + } + + /* Restore the feedback setting */ + rc = regmap_write(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_FEEDBACK_CONTROL, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to restore feedback setting rc=%d\n", + rc); + goto failed_detect; + } + + /* Restore brightness */ + rc = wled4_set_brightness(wled, wled->brightness); + if (rc < 0) { + dev_err(wled->dev, "Failed to set brightness after auto detection rc=%d\n", + rc); + goto failed_detect; + } + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, + WLED3_CTRL_REG_MOD_EN_MASK); + if (rc < 0) { + dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", rc); + goto failed_detect; + } + +failed_detect: + return; +} + +#define WLED_AUTO_DETECT_OVP_COUNT 5 +#define WLED_AUTO_DETECT_CNT_DLY_US USEC_PER_SEC +static bool wled_auto_detection_required(struct wled *wled) +{ + s64 elapsed_time_us; + + if (!wled->cfg.auto_detection_enabled) + return false; + + /* + * Check if the OVP fault was an occasional one + * or if it's firing continuously, the latter qualifies + * for an auto-detection check. + */ + if (!wled->auto_detection_ovp_count) { + wled->start_ovp_fault_time = ktime_get(); + wled->auto_detection_ovp_count++; + } else { + elapsed_time_us = ktime_us_delta(ktime_get(), + wled->start_ovp_fault_time); + if (elapsed_time_us > WLED_AUTO_DETECT_CNT_DLY_US) + wled->auto_detection_ovp_count = 0; + else + wled->auto_detection_ovp_count++; + + if (wled->auto_detection_ovp_count >= + WLED_AUTO_DETECT_OVP_COUNT) { + wled->auto_detection_ovp_count = 0; + return true; + } + } + + return false; +} + +static int wled_auto_detection_at_init(struct wled *wled) +{ + int rc; + u32 fault_status, rt_status; + + if (!wled->cfg.auto_detection_enabled) + return 0; + + rc = regmap_read(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS, + &rt_status); + if (rc < 0) { + dev_err(wled->dev, "Failed to read RT status rc=%d\n", rc); + return rc; + } + + rc = regmap_read(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_FAULT_STATUS, + &fault_status); + if (rc < 0) { + dev_err(wled->dev, "Failed to read fault status rc=%d\n", rc); + return rc; + } + + if ((rt_status & WLED3_CTRL_REG_OVP_FAULT_STATUS) || + (fault_status & WLED3_CTRL_REG_OVP_FAULT_BIT)) { + mutex_lock(&wled->lock); + wled_auto_string_detection(wled); + mutex_unlock(&wled->lock); + } + + return rc; +} + +static irqreturn_t wled_ovp_irq_handler(int irq, void *_wled) +{ + struct wled *wled = _wled; + int rc; + u32 int_sts, fault_sts; + + rc = regmap_read(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS, &int_sts); + if (rc < 0) { + dev_err(wled->dev, "Error in reading WLED3_INT_RT_STS rc=%d\n", + rc); + return IRQ_HANDLED; + } + + rc = regmap_read(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_FAULT_STATUS, &fault_sts); + if (rc < 0) { + dev_err(wled->dev, "Error in reading WLED_FAULT_STATUS rc=%d\n", + rc); + return IRQ_HANDLED; + } + + if (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT | + WLED3_CTRL_REG_ILIM_FAULT_BIT)) + dev_dbg(wled->dev, "WLED OVP fault detected, int_sts=%x fault_sts= %x\n", + int_sts, fault_sts); + + if (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT) { + if (wled_auto_detection_required(wled)) { + mutex_lock(&wled->lock); + wled_auto_string_detection(wled); + mutex_unlock(&wled->lock); + } + } + + return IRQ_HANDLED; +} + static int wled3_setup(struct wled *wled) { u16 addr; @@ -436,8 +775,10 @@ static int wled4_setup(struct wled *wled) sink_en |= 1 << temp; }

- if (sink_cfg == sink_en) - return 0; + if (sink_cfg == sink_en) { + rc = wled_auto_detection_at_init(wled); + return rc; + }

rc = regmap_update_bits(wled->regmap, wled->sink_addr + WLED4_SINK_REG_CURR_SINK, @@ -500,7 +841,9 @@ static int wled4_setup(struct wled *wled) return rc; }

- return 0; + rc = wled_auto_detection_at_init(wled); + + return rc; }

static const struct wled_config wled4_config_defaults = { @@ -511,6 +854,7 @@ static int wled4_setup(struct wled *wled) .switch_freq = 11, .cabc = false, .external_pfet = false, + .auto_detection_enabled = false, };

static const u32 wled3_boost_i_limit_values[] = { @@ -677,6 +1021,7 @@ static int wled_configure(struct wled *wled, int version) { "qcom,ext-gen", &cfg->ext_gen, }, { "qcom,cabc", &cfg->cabc, }, { "qcom,external-pfet", &cfg->external_pfet, }, + { "qcom,auto-string-detection", &cfg->auto_detection_enabled, }, };

prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); @@ -797,6 +1142,40 @@ static int wled_configure_short_irq(struct wled *wled, return rc; }

+static int wled_configure_ovp_irq(struct wled *wled, + struct platform_device *pdev) +{ + int rc; + u32 val; + + wled->ovp_irq = platform_get_irq_byname(pdev, "ovp"); + if (wled->ovp_irq < 0) { + dev_dbg(&pdev->dev, "OVP IRQ not found - disabling automatic string detection\n"); + return 0; + } + + rc = devm_request_threaded_irq(wled->dev, wled->ovp_irq, NULL, + wled_ovp_irq_handler, IRQF_ONESHOT, + "wled_ovp_irq", wled); + if (rc < 0) { + dev_err(wled->dev, "Unable to request ovp_irq (err:%d)\n", + rc); + wled->ovp_irq = 0; + return 0; + } + + rc = regmap_read(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, &val); + if (rc < 0) + return rc; + + /* Keep OVP irq disabled until module is enabled */ + if (!(val & WLED3_CTRL_REG_MOD_EN_MASK)) + disable_irq(wled->ovp_irq); + + return 0; +} + static const struct backlight_ops wled_ops = { .update_status = wled_update_status, }; @@ -837,6 +1216,7 @@ static int wled_probe(struct platform_device *pdev)

switch (version) { case 3: + wled->cfg.auto_detection_enabled = false; rc = wled3_setup(wled); if (rc) { dev_err(&pdev->dev, "wled3_setup failed\n"); @@ -858,10 +1238,16 @@ static int wled_probe(struct platform_device *pdev) break; }

+ INIT_DELAYED_WORK(&wled->ovp_work, wled_ovp_work); + rc = wled_configure_short_irq(wled, pdev); if (rc < 0) return rc;

+ rc = wled_configure_ovp_irq(wled, pdev); + if (rc < 0) + return rc; + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);

@@ -880,7 +1266,9 @@ static int wled_remove(struct platform_device *pdev) struct wled *wled = dev_get_drvdata(&pdev->dev);

mutex_destroy(&wled->lock); + cancel_delayed_work_sync(&wled->ovp_work); disable_irq(wled->short_irq); + disable_irq(wled->ovp_irq);

return 0; }