From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/media/cec/platform/cec-gpio/Makefile | 2 + drivers/media/cec/platform/cec-gpio/cec-gpio.c | 293 +++++++++++++++++++++++++ 2 files changed, 295 insertions(+) create mode 100644 drivers/media/cec/platform/cec-gpio/Makefile create mode 100644 drivers/media/cec/platform/cec-gpio/cec-gpio.c (limited to 'drivers/media/cec/platform/cec-gpio') diff --git a/drivers/media/cec/platform/cec-gpio/Makefile b/drivers/media/cec/platform/cec-gpio/Makefile new file mode 100644 index 0000000000..a40c621dbd --- /dev/null +++ b/drivers/media/cec/platform/cec-gpio/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_CEC_GPIO) += cec-gpio.o diff --git a/drivers/media/cec/platform/cec-gpio/cec-gpio.c b/drivers/media/cec/platform/cec-gpio/cec-gpio.c new file mode 100644 index 0000000000..98dacb0919 --- /dev/null +++ b/drivers/media/cec/platform/cec-gpio/cec-gpio.c @@ -0,0 +1,293 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include + +struct cec_gpio { + struct cec_adapter *adap; + struct cec_notifier *notifier; + struct device *dev; + + struct gpio_desc *cec_gpio; + int cec_irq; + bool cec_is_low; + + struct gpio_desc *hpd_gpio; + int hpd_irq; + bool hpd_is_high; + ktime_t hpd_ts; + + struct gpio_desc *v5_gpio; + int v5_irq; + bool v5_is_high; + ktime_t v5_ts; +}; + +static int cec_gpio_read(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + if (cec->cec_is_low) + return 0; + return gpiod_get_value(cec->cec_gpio); +} + +static void cec_gpio_high(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + if (!cec->cec_is_low) + return; + cec->cec_is_low = false; + gpiod_set_value(cec->cec_gpio, 1); +} + +static void cec_gpio_low(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + if (cec->cec_is_low) + return; + cec->cec_is_low = true; + gpiod_set_value(cec->cec_gpio, 0); +} + +static irqreturn_t cec_hpd_gpio_irq_handler_thread(int irq, void *priv) +{ + struct cec_gpio *cec = priv; + + cec_queue_pin_hpd_event(cec->adap, cec->hpd_is_high, cec->hpd_ts); + return IRQ_HANDLED; +} + +static irqreturn_t cec_5v_gpio_irq_handler(int irq, void *priv) +{ + struct cec_gpio *cec = priv; + int val = gpiod_get_value(cec->v5_gpio); + bool is_high = val > 0; + + if (val < 0 || is_high == cec->v5_is_high) + return IRQ_HANDLED; + cec->v5_ts = ktime_get(); + cec->v5_is_high = is_high; + return IRQ_WAKE_THREAD; +} + +static irqreturn_t cec_5v_gpio_irq_handler_thread(int irq, void *priv) +{ + struct cec_gpio *cec = priv; + + cec_queue_pin_5v_event(cec->adap, cec->v5_is_high, cec->v5_ts); + return IRQ_HANDLED; +} + +static irqreturn_t cec_hpd_gpio_irq_handler(int irq, void *priv) +{ + struct cec_gpio *cec = priv; + int val = gpiod_get_value(cec->hpd_gpio); + bool is_high = val > 0; + + if (val < 0 || is_high == cec->hpd_is_high) + return IRQ_HANDLED; + cec->hpd_ts = ktime_get(); + cec->hpd_is_high = is_high; + return IRQ_WAKE_THREAD; +} + +static irqreturn_t cec_gpio_irq_handler(int irq, void *priv) +{ + struct cec_gpio *cec = priv; + int val = gpiod_get_value(cec->cec_gpio); + + if (val >= 0) + cec_pin_changed(cec->adap, val > 0); + return IRQ_HANDLED; +} + +static bool cec_gpio_enable_irq(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + enable_irq(cec->cec_irq); + return true; +} + +static void cec_gpio_disable_irq(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + disable_irq(cec->cec_irq); +} + +static void cec_gpio_status(struct cec_adapter *adap, struct seq_file *file) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + seq_printf(file, "mode: %s\n", cec->cec_is_low ? "low-drive" : "read"); + seq_printf(file, "using irq: %d\n", cec->cec_irq); + if (cec->hpd_gpio) + seq_printf(file, "hpd: %s\n", + cec->hpd_is_high ? "high" : "low"); + if (cec->v5_gpio) + seq_printf(file, "5V: %s\n", + cec->v5_is_high ? "high" : "low"); +} + +static int cec_gpio_read_hpd(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + if (!cec->hpd_gpio) + return -ENOTTY; + return gpiod_get_value(cec->hpd_gpio); +} + +static int cec_gpio_read_5v(struct cec_adapter *adap) +{ + struct cec_gpio *cec = cec_get_drvdata(adap); + + if (!cec->v5_gpio) + return -ENOTTY; + return gpiod_get_value(cec->v5_gpio); +} + +static const struct cec_pin_ops cec_gpio_pin_ops = { + .read = cec_gpio_read, + .low = cec_gpio_low, + .high = cec_gpio_high, + .enable_irq = cec_gpio_enable_irq, + .disable_irq = cec_gpio_disable_irq, + .status = cec_gpio_status, + .read_hpd = cec_gpio_read_hpd, + .read_5v = cec_gpio_read_5v, +}; + +static int cec_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device *hdmi_dev; + struct cec_gpio *cec; + u32 caps = CEC_CAP_DEFAULTS | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN; + int ret; + + hdmi_dev = cec_notifier_parse_hdmi_phandle(dev); + if (PTR_ERR(hdmi_dev) == -EPROBE_DEFER) + return PTR_ERR(hdmi_dev); + if (IS_ERR(hdmi_dev)) + caps |= CEC_CAP_PHYS_ADDR; + + cec = devm_kzalloc(dev, sizeof(*cec), GFP_KERNEL); + if (!cec) + return -ENOMEM; + + cec->dev = dev; + + cec->cec_gpio = devm_gpiod_get(dev, "cec", GPIOD_OUT_HIGH_OPEN_DRAIN); + if (IS_ERR(cec->cec_gpio)) + return PTR_ERR(cec->cec_gpio); + cec->cec_irq = gpiod_to_irq(cec->cec_gpio); + + cec->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN); + if (IS_ERR(cec->hpd_gpio)) + return PTR_ERR(cec->hpd_gpio); + + cec->v5_gpio = devm_gpiod_get_optional(dev, "v5", GPIOD_IN); + if (IS_ERR(cec->v5_gpio)) + return PTR_ERR(cec->v5_gpio); + + cec->adap = cec_pin_allocate_adapter(&cec_gpio_pin_ops, + cec, pdev->name, caps); + if (IS_ERR(cec->adap)) + return PTR_ERR(cec->adap); + + ret = devm_request_irq(dev, cec->cec_irq, cec_gpio_irq_handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_NO_AUTOEN, + cec->adap->name, cec); + if (ret) + goto del_adap; + + if (cec->hpd_gpio) { + cec->hpd_irq = gpiod_to_irq(cec->hpd_gpio); + ret = devm_request_threaded_irq(dev, cec->hpd_irq, + cec_hpd_gpio_irq_handler, + cec_hpd_gpio_irq_handler_thread, + IRQF_ONESHOT | + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + "hpd-gpio", cec); + if (ret) + goto del_adap; + } + + if (cec->v5_gpio) { + cec->v5_irq = gpiod_to_irq(cec->v5_gpio); + ret = devm_request_threaded_irq(dev, cec->v5_irq, + cec_5v_gpio_irq_handler, + cec_5v_gpio_irq_handler_thread, + IRQF_ONESHOT | + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + "v5-gpio", cec); + if (ret) + goto del_adap; + } + + if (!IS_ERR(hdmi_dev)) { + cec->notifier = cec_notifier_cec_adap_register(hdmi_dev, NULL, + cec->adap); + if (!cec->notifier) { + ret = -ENOMEM; + goto del_adap; + } + } + + ret = cec_register_adapter(cec->adap, &pdev->dev); + if (ret) + goto unreg_notifier; + + platform_set_drvdata(pdev, cec); + return 0; + +unreg_notifier: + cec_notifier_cec_adap_unregister(cec->notifier, cec->adap); +del_adap: + cec_delete_adapter(cec->adap); + return ret; +} + +static void cec_gpio_remove(struct platform_device *pdev) +{ + struct cec_gpio *cec = platform_get_drvdata(pdev); + + cec_notifier_cec_adap_unregister(cec->notifier, cec->adap); + cec_unregister_adapter(cec->adap); +} + +static const struct of_device_id cec_gpio_match[] = { + { + .compatible = "cec-gpio", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, cec_gpio_match); + +static struct platform_driver cec_gpio_pdrv = { + .probe = cec_gpio_probe, + .remove_new = cec_gpio_remove, + .driver = { + .name = "cec-gpio", + .of_match_table = cec_gpio_match, + }, +}; + +module_platform_driver(cec_gpio_pdrv); + +MODULE_AUTHOR("Hans Verkuil "); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CEC GPIO driver"); -- cgit v1.2.3