1 // SPDX-License-Identifier: GPL-2.0-only
7 #include <linux/gpio/consumer.h>
12 #include <media/cec-notifier.h>
13 #include <media/cec-pin.h>
37 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_read()  local
39 	if (cec->cec_is_low)  in cec_gpio_read()
41 	return gpiod_get_value(cec->cec_gpio);  in cec_gpio_read()
46 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_high()  local
48 	if (!cec->cec_is_low)  in cec_gpio_high()
50 	cec->cec_is_low = false;  in cec_gpio_high()
51 	gpiod_set_value(cec->cec_gpio, 1);  in cec_gpio_high()
56 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_low()  local
58 	if (cec->cec_is_low)  in cec_gpio_low()
60 	cec->cec_is_low = true;  in cec_gpio_low()
61 	gpiod_set_value(cec->cec_gpio, 0);  in cec_gpio_low()
66 	struct cec_gpio *cec = priv;  in cec_hpd_gpio_irq_handler_thread()  local
68 	cec_queue_pin_hpd_event(cec->adap, cec->hpd_is_high, cec->hpd_ts);  in cec_hpd_gpio_irq_handler_thread()
74 	struct cec_gpio *cec = priv;  in cec_5v_gpio_irq_handler()  local
75 	int val = gpiod_get_value(cec->v5_gpio);  in cec_5v_gpio_irq_handler()
78 	if (val < 0 || is_high == cec->v5_is_high)  in cec_5v_gpio_irq_handler()
80 	cec->v5_ts = ktime_get();  in cec_5v_gpio_irq_handler()
81 	cec->v5_is_high = is_high;  in cec_5v_gpio_irq_handler()
87 	struct cec_gpio *cec = priv;  in cec_5v_gpio_irq_handler_thread()  local
89 	cec_queue_pin_5v_event(cec->adap, cec->v5_is_high, cec->v5_ts);  in cec_5v_gpio_irq_handler_thread()
95 	struct cec_gpio *cec = priv;  in cec_hpd_gpio_irq_handler()  local
96 	int val = gpiod_get_value(cec->hpd_gpio);  in cec_hpd_gpio_irq_handler()
99 	if (val < 0 || is_high == cec->hpd_is_high)  in cec_hpd_gpio_irq_handler()
101 	cec->hpd_ts = ktime_get();  in cec_hpd_gpio_irq_handler()
102 	cec->hpd_is_high = is_high;  in cec_hpd_gpio_irq_handler()
108 	struct cec_gpio *cec = priv;  in cec_gpio_irq_handler()  local
109 	int val = gpiod_get_value(cec->cec_gpio);  in cec_gpio_irq_handler()
112 		cec_pin_changed(cec->adap, val > 0);  in cec_gpio_irq_handler()
118 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_enable_irq()  local
120 	enable_irq(cec->cec_irq);  in cec_gpio_enable_irq()
126 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_disable_irq()  local
128 	disable_irq(cec->cec_irq);  in cec_gpio_disable_irq()
133 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_status()  local
135 	seq_printf(file, "mode: %s\n", cec->cec_is_low ? "low-drive" : "read");  in cec_gpio_status()
136 	seq_printf(file, "using irq: %d\n", cec->cec_irq);  in cec_gpio_status()
137 	if (cec->hpd_gpio)  in cec_gpio_status()
139 			   cec->hpd_is_high ? "high" : "low");  in cec_gpio_status()
140 	if (cec->v5_gpio)  in cec_gpio_status()
142 			   cec->v5_is_high ? "high" : "low");  in cec_gpio_status()
147 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_read_hpd()  local
149 	if (!cec->hpd_gpio)  in cec_gpio_read_hpd()
150 		return -ENOTTY;  in cec_gpio_read_hpd()
151 	return gpiod_get_value(cec->hpd_gpio);  in cec_gpio_read_hpd()
156 	struct cec_gpio *cec = cec_get_drvdata(adap);  in cec_gpio_read_5v()  local
158 	if (!cec->v5_gpio)  in cec_gpio_read_5v()
159 		return -ENOTTY;  in cec_gpio_read_5v()
160 	return gpiod_get_value(cec->v5_gpio);  in cec_gpio_read_5v()
176 	struct device *dev = &pdev->dev;  in cec_gpio_probe()
178 	struct cec_gpio *cec;  in cec_gpio_probe()  local
183 	if (PTR_ERR(hdmi_dev) == -EPROBE_DEFER)  in cec_gpio_probe()
188 	cec = devm_kzalloc(dev, sizeof(*cec), GFP_KERNEL);  in cec_gpio_probe()
189 	if (!cec)  in cec_gpio_probe()
190 		return -ENOMEM;  in cec_gpio_probe()
192 	cec->dev = dev;  in cec_gpio_probe()
194 	cec->cec_gpio = devm_gpiod_get(dev, "cec", GPIOD_OUT_HIGH_OPEN_DRAIN);  in cec_gpio_probe()
195 	if (IS_ERR(cec->cec_gpio))  in cec_gpio_probe()
196 		return PTR_ERR(cec->cec_gpio);  in cec_gpio_probe()
197 	cec->cec_irq = gpiod_to_irq(cec->cec_gpio);  in cec_gpio_probe()
199 	cec->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);  in cec_gpio_probe()
200 	if (IS_ERR(cec->hpd_gpio))  in cec_gpio_probe()
201 		return PTR_ERR(cec->hpd_gpio);  in cec_gpio_probe()
203 	cec->v5_gpio = devm_gpiod_get_optional(dev, "v5", GPIOD_IN);  in cec_gpio_probe()
204 	if (IS_ERR(cec->v5_gpio))  in cec_gpio_probe()
205 		return PTR_ERR(cec->v5_gpio);  in cec_gpio_probe()
207 	cec->adap = cec_pin_allocate_adapter(&cec_gpio_pin_ops,  in cec_gpio_probe()
208 					     cec, pdev->name, caps);  in cec_gpio_probe()
209 	if (IS_ERR(cec->adap))  in cec_gpio_probe()
210 		return PTR_ERR(cec->adap);  in cec_gpio_probe()
212 	ret = devm_request_irq(dev, cec->cec_irq, cec_gpio_irq_handler,  in cec_gpio_probe()
214 			       cec->adap->name, cec);  in cec_gpio_probe()
218 	if (cec->hpd_gpio) {  in cec_gpio_probe()
219 		cec->hpd_irq = gpiod_to_irq(cec->hpd_gpio);  in cec_gpio_probe()
220 		ret = devm_request_threaded_irq(dev, cec->hpd_irq,  in cec_gpio_probe()
225 			"hpd-gpio", cec);  in cec_gpio_probe()
230 	if (cec->v5_gpio) {  in cec_gpio_probe()
231 		cec->v5_irq = gpiod_to_irq(cec->v5_gpio);  in cec_gpio_probe()
232 		ret = devm_request_threaded_irq(dev, cec->v5_irq,  in cec_gpio_probe()
237 			"v5-gpio", cec);  in cec_gpio_probe()
243 		cec->notifier = cec_notifier_cec_adap_register(hdmi_dev, NULL,  in cec_gpio_probe()
244 							       cec->adap);  in cec_gpio_probe()
245 		if (!cec->notifier) {  in cec_gpio_probe()
246 			ret = -ENOMEM;  in cec_gpio_probe()
251 	ret = cec_register_adapter(cec->adap, &pdev->dev);  in cec_gpio_probe()
255 	platform_set_drvdata(pdev, cec);  in cec_gpio_probe()
259 	cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);  in cec_gpio_probe()
261 	cec_delete_adapter(cec->adap);  in cec_gpio_probe()
267 	struct cec_gpio *cec = platform_get_drvdata(pdev);  in cec_gpio_remove()  local
269 	cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);  in cec_gpio_remove()
270 	cec_unregister_adapter(cec->adap);  in cec_gpio_remove()
275 		.compatible	= "cec-gpio",
285 		.name		= "cec-gpio",
294 MODULE_DESCRIPTION("CEC GPIO driver");