1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * TPD12S015 HDMI ESD protection & level shifter chip driver
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated
6 *
7 * Based on the omapdrm-specific encoder-opa362 driver
8 *
9 * Copyright (C) 2013 Texas Instruments Incorporated
10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
11 */
12
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of.h>
19 #include <linux/of_graph.h>
20 #include <linux/platform_device.h>
21
22 #include <drm/drm_bridge.h>
23
24 struct tpd12s015_device {
25 struct drm_bridge bridge;
26
27 struct gpio_desc *ct_cp_hpd_gpio;
28 struct gpio_desc *ls_oe_gpio;
29 struct gpio_desc *hpd_gpio;
30 int hpd_irq;
31
32 struct drm_bridge *next_bridge;
33 };
34
to_tpd12s015(struct drm_bridge * bridge)35 static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge)
36 {
37 return container_of(bridge, struct tpd12s015_device, bridge);
38 }
39
tpd12s015_attach(struct drm_bridge * bridge,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)40 static int tpd12s015_attach(struct drm_bridge *bridge,
41 struct drm_encoder *encoder,
42 enum drm_bridge_attach_flags flags)
43 {
44 struct tpd12s015_device *tpd = to_tpd12s015(bridge);
45 int ret;
46
47 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
48 return -EINVAL;
49
50 ret = drm_bridge_attach(encoder, tpd->next_bridge,
51 bridge, flags);
52 if (ret < 0)
53 return ret;
54
55 gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1);
56
57 /* DC-DC converter needs at max 300us to get to 90% of 5V. */
58 usleep_range(300, 1000);
59
60 return 0;
61 }
62
tpd12s015_detach(struct drm_bridge * bridge)63 static void tpd12s015_detach(struct drm_bridge *bridge)
64 {
65 struct tpd12s015_device *tpd = to_tpd12s015(bridge);
66
67 gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0);
68 }
69
tpd12s015_detect(struct drm_bridge * bridge)70 static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge)
71 {
72 struct tpd12s015_device *tpd = to_tpd12s015(bridge);
73
74 if (gpiod_get_value_cansleep(tpd->hpd_gpio))
75 return connector_status_connected;
76 else
77 return connector_status_disconnected;
78 }
79
80 static enum drm_connector_status
tpd12s015_bridge_detect(struct drm_bridge * bridge,struct drm_connector * connector)81 tpd12s015_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
82 {
83 return tpd12s015_detect(bridge);
84 }
85
tpd12s015_hpd_enable(struct drm_bridge * bridge)86 static void tpd12s015_hpd_enable(struct drm_bridge *bridge)
87 {
88 struct tpd12s015_device *tpd = to_tpd12s015(bridge);
89
90 gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1);
91 }
92
tpd12s015_hpd_disable(struct drm_bridge * bridge)93 static void tpd12s015_hpd_disable(struct drm_bridge *bridge)
94 {
95 struct tpd12s015_device *tpd = to_tpd12s015(bridge);
96
97 gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0);
98 }
99
100 static const struct drm_bridge_funcs tpd12s015_bridge_funcs = {
101 .attach = tpd12s015_attach,
102 .detach = tpd12s015_detach,
103 .detect = tpd12s015_bridge_detect,
104 .hpd_enable = tpd12s015_hpd_enable,
105 .hpd_disable = tpd12s015_hpd_disable,
106 };
107
tpd12s015_hpd_isr(int irq,void * data)108 static irqreturn_t tpd12s015_hpd_isr(int irq, void *data)
109 {
110 struct tpd12s015_device *tpd = data;
111 struct drm_bridge *bridge = &tpd->bridge;
112
113 drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge));
114
115 return IRQ_HANDLED;
116 }
117
tpd12s015_probe(struct platform_device * pdev)118 static int tpd12s015_probe(struct platform_device *pdev)
119 {
120 struct tpd12s015_device *tpd;
121 struct device_node *node;
122 struct gpio_desc *gpio;
123 int ret;
124
125 tpd = devm_drm_bridge_alloc(&pdev->dev, struct tpd12s015_device,
126 bridge, &tpd12s015_bridge_funcs);
127 if (IS_ERR(tpd))
128 return PTR_ERR(tpd);
129
130 platform_set_drvdata(pdev, tpd);
131
132 tpd->bridge.of_node = pdev->dev.of_node;
133 tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
134 tpd->bridge.ops = DRM_BRIDGE_OP_DETECT;
135
136 /* Get the next bridge, connected to port@1. */
137 node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
138 if (!node)
139 return -ENODEV;
140
141 tpd->next_bridge = of_drm_find_bridge(node);
142 of_node_put(node);
143
144 if (!tpd->next_bridge)
145 return -EPROBE_DEFER;
146
147 /* Get the control and HPD GPIOs. */
148 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
149 GPIOD_OUT_LOW);
150 if (IS_ERR(gpio))
151 return PTR_ERR(gpio);
152
153 tpd->ct_cp_hpd_gpio = gpio;
154
155 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
156 GPIOD_OUT_LOW);
157 if (IS_ERR(gpio))
158 return PTR_ERR(gpio);
159
160 tpd->ls_oe_gpio = gpio;
161
162 gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN);
163 if (IS_ERR(gpio))
164 return PTR_ERR(gpio);
165
166 tpd->hpd_gpio = gpio;
167
168 /* Register the IRQ if the HPD GPIO is IRQ-capable. */
169 tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
170 if (tpd->hpd_irq >= 0) {
171 ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
172 tpd12s015_hpd_isr,
173 IRQF_TRIGGER_RISING |
174 IRQF_TRIGGER_FALLING |
175 IRQF_ONESHOT,
176 "tpd12s015 hpd", tpd);
177 if (ret)
178 return ret;
179
180 tpd->bridge.ops |= DRM_BRIDGE_OP_HPD;
181 }
182
183 /* Register the DRM bridge. */
184 drm_bridge_add(&tpd->bridge);
185
186 return 0;
187 }
188
tpd12s015_remove(struct platform_device * pdev)189 static void tpd12s015_remove(struct platform_device *pdev)
190 {
191 struct tpd12s015_device *tpd = platform_get_drvdata(pdev);
192
193 drm_bridge_remove(&tpd->bridge);
194 }
195
196 static const struct of_device_id tpd12s015_of_match[] = {
197 { .compatible = "ti,tpd12s015", },
198 {},
199 };
200
201 MODULE_DEVICE_TABLE(of, tpd12s015_of_match);
202
203 static struct platform_driver tpd12s015_driver = {
204 .probe = tpd12s015_probe,
205 .remove = tpd12s015_remove,
206 .driver = {
207 .name = "tpd12s015",
208 .of_match_table = tpd12s015_of_match,
209 },
210 };
211
212 module_platform_driver(tpd12s015_driver);
213
214 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
215 MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver");
216 MODULE_LICENSE("GPL");
217