2 * TPD12S015 HDMI ESD protection & level shifter chip driver
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
12 #include <linux/completion.h>
13 #include <linux/delay.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/mutex.h>
20 #include "../dss/omapdss.h"
22 struct panel_drv_data {
23 struct omap_dss_device dssdev;
24 void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
26 struct mutex hpd_lock;
28 struct gpio_desc *ct_cp_hpd_gpio;
29 struct gpio_desc *ls_oe_gpio;
30 struct gpio_desc *hpd_gpio;
33 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
35 static int tpd_connect(struct omap_dss_device *src,
36 struct omap_dss_device *dst)
38 struct panel_drv_data *ddata = to_panel_data(dst);
41 r = omapdss_device_connect(dst->dss, dst, dst->next);
45 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
46 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
48 /* DC-DC converter needs at max 300us to get to 90% of 5V */
54 static void tpd_disconnect(struct omap_dss_device *src,
55 struct omap_dss_device *dst)
57 struct panel_drv_data *ddata = to_panel_data(dst);
59 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
60 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
62 omapdss_device_disconnect(dst, dst->next);
65 static bool tpd_detect(struct omap_dss_device *dssdev)
67 struct panel_drv_data *ddata = to_panel_data(dssdev);
69 return gpiod_get_value_cansleep(ddata->hpd_gpio);
72 static void tpd_register_hpd_cb(struct omap_dss_device *dssdev,
73 void (*cb)(void *cb_data,
74 enum drm_connector_status status),
77 struct panel_drv_data *ddata = to_panel_data(dssdev);
79 mutex_lock(&ddata->hpd_lock);
81 ddata->hpd_cb_data = cb_data;
82 mutex_unlock(&ddata->hpd_lock);
85 static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
87 struct panel_drv_data *ddata = to_panel_data(dssdev);
89 mutex_lock(&ddata->hpd_lock);
91 ddata->hpd_cb_data = NULL;
92 mutex_unlock(&ddata->hpd_lock);
95 static const struct omap_dss_device_ops tpd_ops = {
96 .connect = tpd_connect,
97 .disconnect = tpd_disconnect,
99 .register_hpd_cb = tpd_register_hpd_cb,
100 .unregister_hpd_cb = tpd_unregister_hpd_cb,
103 static irqreturn_t tpd_hpd_isr(int irq, void *data)
105 struct panel_drv_data *ddata = data;
107 mutex_lock(&ddata->hpd_lock);
109 enum drm_connector_status status;
111 if (tpd_detect(&ddata->dssdev))
112 status = connector_status_connected;
114 status = connector_status_disconnected;
116 ddata->hpd_cb(ddata->hpd_cb_data, status);
118 mutex_unlock(&ddata->hpd_lock);
123 static int tpd_probe(struct platform_device *pdev)
125 struct omap_dss_device *dssdev;
126 struct panel_drv_data *ddata;
128 struct gpio_desc *gpio;
130 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
134 platform_set_drvdata(pdev, ddata);
136 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
139 return PTR_ERR(gpio);
141 ddata->ct_cp_hpd_gpio = gpio;
143 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
146 return PTR_ERR(gpio);
148 ddata->ls_oe_gpio = gpio;
150 gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
153 return PTR_ERR(gpio);
155 ddata->hpd_gpio = gpio;
157 mutex_init(&ddata->hpd_lock);
159 r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
161 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
162 "tpd12s015 hpd", ddata);
166 dssdev = &ddata->dssdev;
167 dssdev->ops = &tpd_ops;
168 dssdev->dev = &pdev->dev;
169 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
170 dssdev->owner = THIS_MODULE;
171 dssdev->of_ports = BIT(1) | BIT(0);
172 dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
173 | OMAP_DSS_DEVICE_OP_HPD;
175 dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
176 if (IS_ERR(dssdev->next)) {
177 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
178 dev_err(&pdev->dev, "failed to find video sink\n");
179 return PTR_ERR(dssdev->next);
182 omapdss_device_register(dssdev);
187 static int __exit tpd_remove(struct platform_device *pdev)
189 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
190 struct omap_dss_device *dssdev = &ddata->dssdev;
193 omapdss_device_put(dssdev->next);
194 omapdss_device_unregister(&ddata->dssdev);
199 static const struct of_device_id tpd_of_match[] = {
200 { .compatible = "omapdss,ti,tpd12s015", },
204 MODULE_DEVICE_TABLE(of, tpd_of_match);
206 static struct platform_driver tpd_driver = {
208 .remove = __exit_p(tpd_remove),
211 .of_match_table = tpd_of_match,
212 .suppress_bind_attrs = true,
216 module_platform_driver(tpd_driver);
218 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
219 MODULE_DESCRIPTION("TPD12S015 driver");
220 MODULE_LICENSE("GPL");