282 lines
6.3 KiB
C
282 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/gpio/consumer.h>
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#include <media/cec-pin.h>
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struct cec_gpio {
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struct cec_adapter *adap;
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struct device *dev;
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struct gpio_desc *cec_gpio;
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int cec_irq;
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bool cec_is_low;
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bool cec_have_irq;
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struct gpio_desc *hpd_gpio;
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int hpd_irq;
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bool hpd_is_high;
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ktime_t hpd_ts;
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struct gpio_desc *v5_gpio;
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int v5_irq;
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bool v5_is_high;
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ktime_t v5_ts;
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};
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static bool cec_gpio_read(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (cec->cec_is_low)
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return false;
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return gpiod_get_value(cec->cec_gpio);
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}
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static void cec_gpio_high(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (!cec->cec_is_low)
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return;
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cec->cec_is_low = false;
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gpiod_set_value(cec->cec_gpio, 1);
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}
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static void cec_gpio_low(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (cec->cec_is_low)
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return;
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if (WARN_ON_ONCE(cec->cec_have_irq))
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free_irq(cec->cec_irq, cec);
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cec->cec_have_irq = false;
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cec->cec_is_low = true;
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gpiod_set_value(cec->cec_gpio, 0);
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}
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static irqreturn_t cec_hpd_gpio_irq_handler_thread(int irq, void *priv)
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{
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struct cec_gpio *cec = priv;
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cec_queue_pin_hpd_event(cec->adap, cec->hpd_is_high, cec->hpd_ts);
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return IRQ_HANDLED;
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}
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static irqreturn_t cec_5v_gpio_irq_handler(int irq, void *priv)
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{
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struct cec_gpio *cec = priv;
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bool is_high = gpiod_get_value(cec->v5_gpio);
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if (is_high == cec->v5_is_high)
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return IRQ_HANDLED;
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cec->v5_ts = ktime_get();
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cec->v5_is_high = is_high;
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t cec_5v_gpio_irq_handler_thread(int irq, void *priv)
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{
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struct cec_gpio *cec = priv;
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cec_queue_pin_5v_event(cec->adap, cec->v5_is_high, cec->v5_ts);
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return IRQ_HANDLED;
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}
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static irqreturn_t cec_hpd_gpio_irq_handler(int irq, void *priv)
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{
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struct cec_gpio *cec = priv;
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bool is_high = gpiod_get_value(cec->hpd_gpio);
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if (is_high == cec->hpd_is_high)
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return IRQ_HANDLED;
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cec->hpd_ts = ktime_get();
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cec->hpd_is_high = is_high;
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t cec_gpio_irq_handler(int irq, void *priv)
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{
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struct cec_gpio *cec = priv;
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cec_pin_changed(cec->adap, gpiod_get_value(cec->cec_gpio));
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return IRQ_HANDLED;
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}
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static bool cec_gpio_enable_irq(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (cec->cec_have_irq)
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return true;
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if (request_irq(cec->cec_irq, cec_gpio_irq_handler,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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adap->name, cec))
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return false;
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cec->cec_have_irq = true;
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return true;
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}
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static void cec_gpio_disable_irq(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (cec->cec_have_irq)
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free_irq(cec->cec_irq, cec);
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cec->cec_have_irq = false;
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}
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static void cec_gpio_status(struct cec_adapter *adap, struct seq_file *file)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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seq_printf(file, "mode: %s\n", cec->cec_is_low ? "low-drive" : "read");
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if (cec->cec_have_irq)
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seq_printf(file, "using irq: %d\n", cec->cec_irq);
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if (cec->hpd_gpio)
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seq_printf(file, "hpd: %s\n",
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cec->hpd_is_high ? "high" : "low");
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if (cec->v5_gpio)
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seq_printf(file, "5V: %s\n",
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cec->v5_is_high ? "high" : "low");
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}
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static int cec_gpio_read_hpd(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (!cec->hpd_gpio)
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return -ENOTTY;
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return gpiod_get_value(cec->hpd_gpio);
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}
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static int cec_gpio_read_5v(struct cec_adapter *adap)
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{
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struct cec_gpio *cec = cec_get_drvdata(adap);
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if (!cec->v5_gpio)
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return -ENOTTY;
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return gpiod_get_value(cec->v5_gpio);
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}
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static void cec_gpio_free(struct cec_adapter *adap)
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{
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cec_gpio_disable_irq(adap);
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}
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static const struct cec_pin_ops cec_gpio_pin_ops = {
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.read = cec_gpio_read,
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.low = cec_gpio_low,
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.high = cec_gpio_high,
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.enable_irq = cec_gpio_enable_irq,
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.disable_irq = cec_gpio_disable_irq,
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.status = cec_gpio_status,
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.free = cec_gpio_free,
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.read_hpd = cec_gpio_read_hpd,
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.read_5v = cec_gpio_read_5v,
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};
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static int cec_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct cec_gpio *cec;
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int ret;
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cec = devm_kzalloc(dev, sizeof(*cec), GFP_KERNEL);
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if (!cec)
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return -ENOMEM;
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cec->dev = dev;
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cec->cec_gpio = devm_gpiod_get(dev, "cec", GPIOD_OUT_HIGH_OPEN_DRAIN);
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if (IS_ERR(cec->cec_gpio))
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return PTR_ERR(cec->cec_gpio);
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cec->cec_irq = gpiod_to_irq(cec->cec_gpio);
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cec->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);
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if (IS_ERR(cec->hpd_gpio))
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return PTR_ERR(cec->hpd_gpio);
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cec->v5_gpio = devm_gpiod_get_optional(dev, "v5", GPIOD_IN);
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if (IS_ERR(cec->v5_gpio))
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return PTR_ERR(cec->v5_gpio);
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cec->adap = cec_pin_allocate_adapter(&cec_gpio_pin_ops,
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cec, pdev->name, CEC_CAP_DEFAULTS | CEC_CAP_PHYS_ADDR |
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CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN);
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if (IS_ERR(cec->adap))
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return PTR_ERR(cec->adap);
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if (cec->hpd_gpio) {
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cec->hpd_irq = gpiod_to_irq(cec->hpd_gpio);
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ret = devm_request_threaded_irq(dev, cec->hpd_irq,
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cec_hpd_gpio_irq_handler,
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cec_hpd_gpio_irq_handler_thread,
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IRQF_ONESHOT |
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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"hpd-gpio", cec);
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if (ret)
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return ret;
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}
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if (cec->v5_gpio) {
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cec->v5_irq = gpiod_to_irq(cec->v5_gpio);
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ret = devm_request_threaded_irq(dev, cec->v5_irq,
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cec_5v_gpio_irq_handler,
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cec_5v_gpio_irq_handler_thread,
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IRQF_ONESHOT |
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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"v5-gpio", cec);
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if (ret)
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return ret;
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}
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ret = cec_register_adapter(cec->adap, &pdev->dev);
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if (ret) {
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cec_delete_adapter(cec->adap);
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return ret;
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}
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platform_set_drvdata(pdev, cec);
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return 0;
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}
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static int cec_gpio_remove(struct platform_device *pdev)
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{
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struct cec_gpio *cec = platform_get_drvdata(pdev);
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cec_unregister_adapter(cec->adap);
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return 0;
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}
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static const struct of_device_id cec_gpio_match[] = {
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{
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.compatible = "cec-gpio",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, cec_gpio_match);
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static struct platform_driver cec_gpio_pdrv = {
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.probe = cec_gpio_probe,
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.remove = cec_gpio_remove,
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.driver = {
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.name = "cec-gpio",
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.of_match_table = cec_gpio_match,
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},
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};
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module_platform_driver(cec_gpio_pdrv);
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MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("CEC GPIO driver");
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