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);