1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HDMI Connector driver
4 *
5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9 #include <linux/gpio/consumer.h>
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14
15 #include "../dss/omapdss.h"
16
17 struct panel_drv_data {
18 struct omap_dss_device dssdev;
19 void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
20 void *hpd_cb_data;
21 struct mutex hpd_lock;
22
23 struct device *dev;
24
25 struct gpio_desc *hpd_gpio;
26 };
27
28 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
29
hdmic_connect(struct omap_dss_device * src,struct omap_dss_device * dst)30 static int hdmic_connect(struct omap_dss_device *src,
31 struct omap_dss_device *dst)
32 {
33 return 0;
34 }
35
hdmic_disconnect(struct omap_dss_device * src,struct omap_dss_device * dst)36 static void hdmic_disconnect(struct omap_dss_device *src,
37 struct omap_dss_device *dst)
38 {
39 }
40
hdmic_detect(struct omap_dss_device * dssdev)41 static bool hdmic_detect(struct omap_dss_device *dssdev)
42 {
43 struct panel_drv_data *ddata = to_panel_data(dssdev);
44
45 return gpiod_get_value_cansleep(ddata->hpd_gpio);
46 }
47
hdmic_register_hpd_cb(struct omap_dss_device * dssdev,void (* cb)(void * cb_data,enum drm_connector_status status),void * cb_data)48 static void hdmic_register_hpd_cb(struct omap_dss_device *dssdev,
49 void (*cb)(void *cb_data,
50 enum drm_connector_status status),
51 void *cb_data)
52 {
53 struct panel_drv_data *ddata = to_panel_data(dssdev);
54
55 mutex_lock(&ddata->hpd_lock);
56 ddata->hpd_cb = cb;
57 ddata->hpd_cb_data = cb_data;
58 mutex_unlock(&ddata->hpd_lock);
59 }
60
hdmic_unregister_hpd_cb(struct omap_dss_device * dssdev)61 static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
62 {
63 struct panel_drv_data *ddata = to_panel_data(dssdev);
64
65 mutex_lock(&ddata->hpd_lock);
66 ddata->hpd_cb = NULL;
67 ddata->hpd_cb_data = NULL;
68 mutex_unlock(&ddata->hpd_lock);
69 }
70
71 static const struct omap_dss_device_ops hdmic_ops = {
72 .connect = hdmic_connect,
73 .disconnect = hdmic_disconnect,
74
75 .detect = hdmic_detect,
76 .register_hpd_cb = hdmic_register_hpd_cb,
77 .unregister_hpd_cb = hdmic_unregister_hpd_cb,
78 };
79
hdmic_hpd_isr(int irq,void * data)80 static irqreturn_t hdmic_hpd_isr(int irq, void *data)
81 {
82 struct panel_drv_data *ddata = data;
83
84 mutex_lock(&ddata->hpd_lock);
85 if (ddata->hpd_cb) {
86 enum drm_connector_status status;
87
88 if (hdmic_detect(&ddata->dssdev))
89 status = connector_status_connected;
90 else
91 status = connector_status_disconnected;
92
93 ddata->hpd_cb(ddata->hpd_cb_data, status);
94 }
95 mutex_unlock(&ddata->hpd_lock);
96
97 return IRQ_HANDLED;
98 }
99
hdmic_probe(struct platform_device * pdev)100 static int hdmic_probe(struct platform_device *pdev)
101 {
102 struct panel_drv_data *ddata;
103 struct omap_dss_device *dssdev;
104 struct gpio_desc *gpio;
105 int r;
106
107 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
108 if (!ddata)
109 return -ENOMEM;
110
111 platform_set_drvdata(pdev, ddata);
112 ddata->dev = &pdev->dev;
113
114 mutex_init(&ddata->hpd_lock);
115
116 /* HPD GPIO */
117 gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
118 if (IS_ERR(gpio)) {
119 dev_err(&pdev->dev, "failed to parse HPD gpio\n");
120 return PTR_ERR(gpio);
121 }
122
123 ddata->hpd_gpio = gpio;
124
125 if (ddata->hpd_gpio) {
126 r = devm_request_threaded_irq(&pdev->dev,
127 gpiod_to_irq(ddata->hpd_gpio),
128 NULL, hdmic_hpd_isr,
129 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
130 IRQF_ONESHOT,
131 "hdmic hpd", ddata);
132 if (r)
133 return r;
134 }
135
136 dssdev = &ddata->dssdev;
137 dssdev->ops = &hdmic_ops;
138 dssdev->dev = &pdev->dev;
139 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
140 dssdev->display = true;
141 dssdev->owner = THIS_MODULE;
142 dssdev->of_ports = BIT(0);
143 dssdev->ops_flags = ddata->hpd_gpio
144 ? OMAP_DSS_DEVICE_OP_DETECT | OMAP_DSS_DEVICE_OP_HPD
145 : 0;
146
147 omapdss_display_init(dssdev);
148 omapdss_device_register(dssdev);
149
150 return 0;
151 }
152
hdmic_remove(struct platform_device * pdev)153 static int __exit hdmic_remove(struct platform_device *pdev)
154 {
155 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
156
157 omapdss_device_unregister(&ddata->dssdev);
158
159 return 0;
160 }
161
162 static const struct of_device_id hdmic_of_match[] = {
163 { .compatible = "omapdss,hdmi-connector", },
164 {},
165 };
166
167 MODULE_DEVICE_TABLE(of, hdmic_of_match);
168
169 static struct platform_driver hdmi_connector_driver = {
170 .probe = hdmic_probe,
171 .remove = __exit_p(hdmic_remove),
172 .driver = {
173 .name = "connector-hdmi",
174 .of_match_table = hdmic_of_match,
175 .suppress_bind_attrs = true,
176 },
177 };
178
179 module_platform_driver(hdmi_connector_driver);
180
181 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
182 MODULE_DESCRIPTION("HDMI Connector driver");
183 MODULE_LICENSE("GPL");
184