The TI TPD12S015 is an HDMI level shifter and ESD protector controlled through GPIOs. Add a DRM bridge driver for the device.
Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com --- Changes since v1:
- Remove empty .hpd_enable() and .hpd_disable() operations --- drivers/gpu/drm/bridge/Kconfig | 8 ++ drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/ti-tpd12s015.c | 195 ++++++++++++++++++++++++++ 3 files changed, 204 insertions(+) create mode 100644 drivers/gpu/drm/bridge/ti-tpd12s015.c
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index f776d522c5aa..c8a28df5ffc1 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -161,6 +161,14 @@ config DRM_TI_SN65DSI86 help Texas Instruments SN65DSI86 DSI to eDP Bridge driver
+config DRM_TI_TPD12S015 + tristate "TI TPD12S015 HDMI level shifter and ESD protection" + depends on OF + select DRM_KMS_HELPER + help + Texas Instruments TPD12S015 HDMI level shifter and ESD protection + driver. + source "drivers/gpu/drm/bridge/analogix/Kconfig"
source "drivers/gpu/drm/bridge/adv7511/Kconfig" diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index e5987b3aaf62..ce635651e31b 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -17,4 +17,5 @@ obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/ obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/ obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o +obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o obj-y += synopsys/ diff --git a/drivers/gpu/drm/bridge/ti-tpd12s015.c b/drivers/gpu/drm/bridge/ti-tpd12s015.c new file mode 100644 index 000000000000..dc7c5578d258 --- /dev/null +++ b/drivers/gpu/drm/bridge/ti-tpd12s015.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * TPD12S015 HDMI ESD protection & level shifter chip driver + * + * Copyright (C) 2013 Texas Instruments Incorporated + * Author: Tomi Valkeinen tomi.valkeinen@ti.com + */ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> + +#include <drm/drm_bridge.h> + +struct tpd12s015_device { + struct drm_bridge bridge; + + struct gpio_desc *ct_cp_hpd_gpio; + struct gpio_desc *ls_oe_gpio; + struct gpio_desc *hpd_gpio; + int hpd_irq; + + struct drm_bridge *next_bridge; +}; + +static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge) +{ + return container_of(bridge, struct tpd12s015_device, bridge); +} + +static int tpd12s015_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct tpd12s015_device *tpd = to_tpd12s015(bridge); + int ret; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) + return -EINVAL; + + ret = drm_bridge_attach(bridge->encoder, tpd->next_bridge, + bridge, flags); + if (ret < 0) + return ret; + + gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1); + gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1); + + /* DC-DC converter needs at max 300us to get to 90% of 5V. */ + usleep_range(300, 1000); + + return 0; +} + +static void tpd12s015_detach(struct drm_bridge *bridge) +{ + struct tpd12s015_device *tpd = to_tpd12s015(bridge); + + gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0); + gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0); +} + +static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge) +{ + struct tpd12s015_device *tpd = to_tpd12s015(bridge); + + if (gpiod_get_value_cansleep(tpd->hpd_gpio)) + return connector_status_connected; + else + return connector_status_disconnected; +} + +static const struct drm_bridge_funcs tpd12s015_bridge_funcs = { + .attach = tpd12s015_attach, + .detach = tpd12s015_detach, + .detect = tpd12s015_detect, +}; + +static irqreturn_t tpd12s015_hpd_isr(int irq, void *data) +{ + struct tpd12s015_device *tpd = data; + struct drm_bridge *bridge = &tpd->bridge; + + drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge)); + + return IRQ_HANDLED; +} + +static int tpd12s015_probe(struct platform_device *pdev) +{ + struct tpd12s015_device *tpd; + struct device_node *node; + struct gpio_desc *gpio; + int ret; + + tpd = devm_kzalloc(&pdev->dev, sizeof(*tpd), GFP_KERNEL); + if (!tpd) + return -ENOMEM; + + platform_set_drvdata(pdev, tpd); + + tpd->bridge.funcs = &tpd12s015_bridge_funcs; + tpd->bridge.of_node = pdev->dev.of_node; + tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA; + tpd->bridge.ops = DRM_BRIDGE_OP_DETECT; + + /* Get the next bridge, connected to port@1. */ + node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1); + if (!node) + return -ENODEV; + + tpd->next_bridge = of_drm_find_bridge(node); + of_node_put(node); + + if (!tpd->next_bridge) + return -EPROBE_DEFER; + + /* Get the control and HPD GPIOs. */ + gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0, + GPIOD_OUT_LOW); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + + tpd->ct_cp_hpd_gpio = gpio; + + gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1, + GPIOD_OUT_LOW); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + + tpd->ls_oe_gpio = gpio; + + gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + + tpd->hpd_gpio = gpio; + + /* Register the IRQ if the HPD GPIO is IRQ-capable. */ + if (tpd->hpd_gpio) + tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio); + + if (tpd->hpd_irq) { + ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL, + tpd12s015_hpd_isr, + IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + "tpd12s015 hpd", tpd); + if (ret) + return ret; + + tpd->bridge.ops |= DRM_BRIDGE_OP_HPD; + } + + /* Register the DRM bridge. */ + drm_bridge_add(&tpd->bridge); + + return 0; +} + +static int __exit tpd12s015_remove(struct platform_device *pdev) +{ + struct tpd12s015_device *tpd = platform_get_drvdata(pdev); + + drm_bridge_remove(&tpd->bridge); + + return 0; +} + +static const struct of_device_id tpd12s015_of_match[] = { + { .compatible = "ti,tpd12s015", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, tpd12s015_of_match); + +static struct platform_driver tpd12s015_driver = { + .probe = tpd12s015_probe, + .remove = __exit_p(tpd12s015_remove), + .driver = { + .name = "tpd12s015", + .of_match_table = tpd12s015_of_match, + }, +}; + +module_platform_driver(tpd12s015_driver); + +MODULE_AUTHOR("Tomi Valkeinen tomi.valkeinen@ti.com"); +MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver"); +MODULE_LICENSE("GPL");