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 | |
35 | static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge) |
36 | { |
37 | return container_of(bridge, struct tpd12s015_device, bridge); |
38 | } |
39 | |
40 | static int tpd12s015_attach(struct drm_bridge *bridge, |
41 | enum drm_bridge_attach_flags flags) |
42 | { |
43 | struct tpd12s015_device *tpd = to_tpd12s015(bridge); |
44 | int ret; |
45 | |
46 | if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) |
47 | return -EINVAL; |
48 | |
49 | ret = drm_bridge_attach(encoder: bridge->encoder, bridge: tpd->next_bridge, |
50 | previous: bridge, flags); |
51 | if (ret < 0) |
52 | return ret; |
53 | |
54 | gpiod_set_value_cansleep(desc: tpd->ls_oe_gpio, value: 1); |
55 | |
56 | /* DC-DC converter needs at max 300us to get to 90% of 5V. */ |
57 | usleep_range(min: 300, max: 1000); |
58 | |
59 | return 0; |
60 | } |
61 | |
62 | static void tpd12s015_detach(struct drm_bridge *bridge) |
63 | { |
64 | struct tpd12s015_device *tpd = to_tpd12s015(bridge); |
65 | |
66 | gpiod_set_value_cansleep(desc: tpd->ls_oe_gpio, value: 0); |
67 | } |
68 | |
69 | static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge) |
70 | { |
71 | struct tpd12s015_device *tpd = to_tpd12s015(bridge); |
72 | |
73 | if (gpiod_get_value_cansleep(desc: tpd->hpd_gpio)) |
74 | return connector_status_connected; |
75 | else |
76 | return connector_status_disconnected; |
77 | } |
78 | |
79 | static void tpd12s015_hpd_enable(struct drm_bridge *bridge) |
80 | { |
81 | struct tpd12s015_device *tpd = to_tpd12s015(bridge); |
82 | |
83 | gpiod_set_value_cansleep(desc: tpd->ct_cp_hpd_gpio, value: 1); |
84 | } |
85 | |
86 | static void tpd12s015_hpd_disable(struct drm_bridge *bridge) |
87 | { |
88 | struct tpd12s015_device *tpd = to_tpd12s015(bridge); |
89 | |
90 | gpiod_set_value_cansleep(desc: tpd->ct_cp_hpd_gpio, value: 0); |
91 | } |
92 | |
93 | static const struct drm_bridge_funcs tpd12s015_bridge_funcs = { |
94 | .attach = tpd12s015_attach, |
95 | .detach = tpd12s015_detach, |
96 | .detect = tpd12s015_detect, |
97 | .hpd_enable = tpd12s015_hpd_enable, |
98 | .hpd_disable = tpd12s015_hpd_disable, |
99 | }; |
100 | |
101 | static irqreturn_t tpd12s015_hpd_isr(int irq, void *data) |
102 | { |
103 | struct tpd12s015_device *tpd = data; |
104 | struct drm_bridge *bridge = &tpd->bridge; |
105 | |
106 | drm_bridge_hpd_notify(bridge, status: tpd12s015_detect(bridge)); |
107 | |
108 | return IRQ_HANDLED; |
109 | } |
110 | |
111 | static int tpd12s015_probe(struct platform_device *pdev) |
112 | { |
113 | struct tpd12s015_device *tpd; |
114 | struct device_node *node; |
115 | struct gpio_desc *gpio; |
116 | int ret; |
117 | |
118 | tpd = devm_kzalloc(dev: &pdev->dev, size: sizeof(*tpd), GFP_KERNEL); |
119 | if (!tpd) |
120 | return -ENOMEM; |
121 | |
122 | platform_set_drvdata(pdev, data: tpd); |
123 | |
124 | tpd->bridge.funcs = &tpd12s015_bridge_funcs; |
125 | tpd->bridge.of_node = pdev->dev.of_node; |
126 | tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA; |
127 | tpd->bridge.ops = DRM_BRIDGE_OP_DETECT; |
128 | |
129 | /* Get the next bridge, connected to port@1. */ |
130 | node = of_graph_get_remote_node(node: pdev->dev.of_node, port: 1, endpoint: -1); |
131 | if (!node) |
132 | return -ENODEV; |
133 | |
134 | tpd->next_bridge = of_drm_find_bridge(np: node); |
135 | of_node_put(node); |
136 | |
137 | if (!tpd->next_bridge) |
138 | return -EPROBE_DEFER; |
139 | |
140 | /* Get the control and HPD GPIOs. */ |
141 | gpio = devm_gpiod_get_index_optional(dev: &pdev->dev, NULL, index: 0, |
142 | flags: GPIOD_OUT_LOW); |
143 | if (IS_ERR(ptr: gpio)) |
144 | return PTR_ERR(ptr: gpio); |
145 | |
146 | tpd->ct_cp_hpd_gpio = gpio; |
147 | |
148 | gpio = devm_gpiod_get_index_optional(dev: &pdev->dev, NULL, index: 1, |
149 | flags: GPIOD_OUT_LOW); |
150 | if (IS_ERR(ptr: gpio)) |
151 | return PTR_ERR(ptr: gpio); |
152 | |
153 | tpd->ls_oe_gpio = gpio; |
154 | |
155 | gpio = devm_gpiod_get_index(dev: &pdev->dev, NULL, idx: 2, flags: GPIOD_IN); |
156 | if (IS_ERR(ptr: gpio)) |
157 | return PTR_ERR(ptr: gpio); |
158 | |
159 | tpd->hpd_gpio = gpio; |
160 | |
161 | /* Register the IRQ if the HPD GPIO is IRQ-capable. */ |
162 | tpd->hpd_irq = gpiod_to_irq(desc: tpd->hpd_gpio); |
163 | if (tpd->hpd_irq >= 0) { |
164 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: tpd->hpd_irq, NULL, |
165 | thread_fn: tpd12s015_hpd_isr, |
166 | IRQF_TRIGGER_RISING | |
167 | IRQF_TRIGGER_FALLING | |
168 | IRQF_ONESHOT, |
169 | devname: "tpd12s015 hpd" , dev_id: tpd); |
170 | if (ret) |
171 | return ret; |
172 | |
173 | tpd->bridge.ops |= DRM_BRIDGE_OP_HPD; |
174 | } |
175 | |
176 | /* Register the DRM bridge. */ |
177 | drm_bridge_add(bridge: &tpd->bridge); |
178 | |
179 | return 0; |
180 | } |
181 | |
182 | static int __exit tpd12s015_remove(struct platform_device *pdev) |
183 | { |
184 | struct tpd12s015_device *tpd = platform_get_drvdata(pdev); |
185 | |
186 | drm_bridge_remove(bridge: &tpd->bridge); |
187 | |
188 | return 0; |
189 | } |
190 | |
191 | static const struct of_device_id tpd12s015_of_match[] = { |
192 | { .compatible = "ti,tpd12s015" , }, |
193 | {}, |
194 | }; |
195 | |
196 | MODULE_DEVICE_TABLE(of, tpd12s015_of_match); |
197 | |
198 | static struct platform_driver tpd12s015_driver = { |
199 | .probe = tpd12s015_probe, |
200 | .remove = __exit_p(tpd12s015_remove), |
201 | .driver = { |
202 | .name = "tpd12s015" , |
203 | .of_match_table = tpd12s015_of_match, |
204 | }, |
205 | }; |
206 | |
207 | module_platform_driver(tpd12s015_driver); |
208 | |
209 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>" ); |
210 | MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver" ); |
211 | MODULE_LICENSE("GPL" ); |
212 | |