// 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 struct cec_gpio { struct cec_adapter *adap; struct device *dev; struct gpio_desc *cec_gpio; int cec_irq; bool cec_is_low; bool cec_have_irq; 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 bool cec_gpio_read(struct cec_adapter *adap) { struct cec_gpio *cec = cec_get_drvdata(adap); if (cec->cec_is_low) return false; 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; if (WARN_ON_ONCE(cec->cec_have_irq)) free_irq(cec->cec_irq, cec); cec->cec_have_irq = false; 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; bool is_high = gpiod_get_value(cec->v5_gpio); if (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; bool is_high = gpiod_get_value(cec->hpd_gpio); if (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; cec_pin_changed(cec->adap, gpiod_get_value(cec->cec_gpio)); return IRQ_HANDLED; } static bool cec_gpio_enable_irq(struct cec_adapter *adap) { struct cec_gpio *cec = cec_get_drvdata(adap); if (cec->cec_have_irq) return true; if (request_irq(cec->cec_irq, cec_gpio_irq_handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, adap->name, cec)) return false; cec->cec_have_irq = true; return true; } static void cec_gpio_disable_irq(struct cec_adapter *adap) { struct cec_gpio *cec = cec_get_drvdata(adap); if (cec->cec_have_irq) free_irq(cec->cec_irq, cec); cec->cec_have_irq = false; } 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"); if (cec->cec_have_irq) 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 void cec_gpio_free(struct cec_adapter *adap) { cec_gpio_disable_irq(adap); } 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, .free = cec_gpio_free, .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 cec_gpio *cec; int ret; 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, CEC_CAP_DEFAULTS | CEC_CAP_PHYS_ADDR | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN); if (IS_ERR(cec->adap)) return PTR_ERR(cec->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) return ret; } 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) return ret; } ret = cec_register_adapter(cec->adap, &pdev->dev); if (ret) { cec_delete_adapter(cec->adap); return ret; } platform_set_drvdata(pdev, cec); return 0; } static int cec_gpio_remove(struct platform_device *pdev) { struct cec_gpio *cec = platform_get_drvdata(pdev); cec_unregister_adapter(cec->adap); return 0; } 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 = 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");