Loading...
1/*
2 * NXP PTN3460 DP/LVDS bridge driver
3 *
4 * Copyright (C) 2013 Google, Inc.
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/delay.h>
17#include <linux/gpio.h>
18#include <linux/gpio/consumer.h>
19#include <linux/i2c.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/of_gpio.h>
23#include <linux/of_graph.h>
24
25#include <drm/drm_panel.h>
26
27#include "drm_crtc.h"
28#include "drm_crtc_helper.h"
29#include "drm_atomic_helper.h"
30#include "drm_edid.h"
31#include "drmP.h"
32
33#define PTN3460_EDID_ADDR 0x0
34#define PTN3460_EDID_EMULATION_ADDR 0x84
35#define PTN3460_EDID_ENABLE_EMULATION 0
36#define PTN3460_EDID_EMULATION_SELECTION 1
37#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
38
39struct ptn3460_bridge {
40 struct drm_connector connector;
41 struct i2c_client *client;
42 struct drm_bridge bridge;
43 struct edid *edid;
44 struct drm_panel *panel;
45 struct gpio_desc *gpio_pd_n;
46 struct gpio_desc *gpio_rst_n;
47 u32 edid_emulation;
48 bool enabled;
49};
50
51static inline struct ptn3460_bridge *
52 bridge_to_ptn3460(struct drm_bridge *bridge)
53{
54 return container_of(bridge, struct ptn3460_bridge, bridge);
55}
56
57static inline struct ptn3460_bridge *
58 connector_to_ptn3460(struct drm_connector *connector)
59{
60 return container_of(connector, struct ptn3460_bridge, connector);
61}
62
63static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
64 u8 *buf, int len)
65{
66 int ret;
67
68 ret = i2c_master_send(ptn_bridge->client, &addr, 1);
69 if (ret <= 0) {
70 DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
71 return ret;
72 }
73
74 ret = i2c_master_recv(ptn_bridge->client, buf, len);
75 if (ret <= 0) {
76 DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
77 return ret;
78 }
79
80 return 0;
81}
82
83static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
84 char val)
85{
86 int ret;
87 char buf[2];
88
89 buf[0] = addr;
90 buf[1] = val;
91
92 ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
93 if (ret <= 0) {
94 DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
95 return ret;
96 }
97
98 return 0;
99}
100
101static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
102{
103 int ret;
104 char val;
105
106 /* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
107 ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
108 ptn_bridge->edid_emulation);
109 if (ret) {
110 DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
111 return ret;
112 }
113
114 /* Enable EDID emulation and select the desired EDID */
115 val = 1 << PTN3460_EDID_ENABLE_EMULATION |
116 ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
117
118 ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
119 if (ret) {
120 DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
121 return ret;
122 }
123
124 return 0;
125}
126
127static void ptn3460_pre_enable(struct drm_bridge *bridge)
128{
129 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
130 int ret;
131
132 if (ptn_bridge->enabled)
133 return;
134
135 gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
136
137 gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
138 usleep_range(10, 20);
139 gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
140
141 if (drm_panel_prepare(ptn_bridge->panel)) {
142 DRM_ERROR("failed to prepare panel\n");
143 return;
144 }
145
146 /*
147 * There's a bug in the PTN chip where it falsely asserts hotplug before
148 * it is fully functional. We're forced to wait for the maximum start up
149 * time specified in the chip's datasheet to make sure we're really up.
150 */
151 msleep(90);
152
153 ret = ptn3460_select_edid(ptn_bridge);
154 if (ret)
155 DRM_ERROR("Select EDID failed ret=%d\n", ret);
156
157 ptn_bridge->enabled = true;
158}
159
160static void ptn3460_enable(struct drm_bridge *bridge)
161{
162 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
163
164 if (drm_panel_enable(ptn_bridge->panel)) {
165 DRM_ERROR("failed to enable panel\n");
166 return;
167 }
168}
169
170static void ptn3460_disable(struct drm_bridge *bridge)
171{
172 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
173
174 if (!ptn_bridge->enabled)
175 return;
176
177 ptn_bridge->enabled = false;
178
179 if (drm_panel_disable(ptn_bridge->panel)) {
180 DRM_ERROR("failed to disable panel\n");
181 return;
182 }
183
184 gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
185 gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
186}
187
188static void ptn3460_post_disable(struct drm_bridge *bridge)
189{
190 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
191
192 if (drm_panel_unprepare(ptn_bridge->panel)) {
193 DRM_ERROR("failed to unprepare panel\n");
194 return;
195 }
196}
197
198static int ptn3460_get_modes(struct drm_connector *connector)
199{
200 struct ptn3460_bridge *ptn_bridge;
201 u8 *edid;
202 int ret, num_modes = 0;
203 bool power_off;
204
205 ptn_bridge = connector_to_ptn3460(connector);
206
207 if (ptn_bridge->edid)
208 return drm_add_edid_modes(connector, ptn_bridge->edid);
209
210 power_off = !ptn_bridge->enabled;
211 ptn3460_pre_enable(&ptn_bridge->bridge);
212
213 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
214 if (!edid) {
215 DRM_ERROR("Failed to allocate EDID\n");
216 return 0;
217 }
218
219 ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
220 EDID_LENGTH);
221 if (ret) {
222 kfree(edid);
223 goto out;
224 }
225
226 ptn_bridge->edid = (struct edid *)edid;
227 drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);
228
229 num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
230
231out:
232 if (power_off)
233 ptn3460_disable(&ptn_bridge->bridge);
234
235 return num_modes;
236}
237
238static struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
239{
240 struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
241
242 return ptn_bridge->bridge.encoder;
243}
244
245static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
246 .get_modes = ptn3460_get_modes,
247 .best_encoder = ptn3460_best_encoder,
248};
249
250static enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
251 bool force)
252{
253 return connector_status_connected;
254}
255
256static void ptn3460_connector_destroy(struct drm_connector *connector)
257{
258 drm_connector_cleanup(connector);
259}
260
261static const struct drm_connector_funcs ptn3460_connector_funcs = {
262 .dpms = drm_atomic_helper_connector_dpms,
263 .fill_modes = drm_helper_probe_single_connector_modes,
264 .detect = ptn3460_detect,
265 .destroy = ptn3460_connector_destroy,
266 .reset = drm_atomic_helper_connector_reset,
267 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
268 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
269};
270
271static int ptn3460_bridge_attach(struct drm_bridge *bridge)
272{
273 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
274 int ret;
275
276 if (!bridge->encoder) {
277 DRM_ERROR("Parent encoder object not found");
278 return -ENODEV;
279 }
280
281 ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
282 ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
283 &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
284 if (ret) {
285 DRM_ERROR("Failed to initialize connector with drm\n");
286 return ret;
287 }
288 drm_connector_helper_add(&ptn_bridge->connector,
289 &ptn3460_connector_helper_funcs);
290 drm_connector_register(&ptn_bridge->connector);
291 drm_mode_connector_attach_encoder(&ptn_bridge->connector,
292 bridge->encoder);
293
294 if (ptn_bridge->panel)
295 drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
296
297 drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
298
299 return ret;
300}
301
302static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
303 .pre_enable = ptn3460_pre_enable,
304 .enable = ptn3460_enable,
305 .disable = ptn3460_disable,
306 .post_disable = ptn3460_post_disable,
307 .attach = ptn3460_bridge_attach,
308};
309
310static int ptn3460_probe(struct i2c_client *client,
311 const struct i2c_device_id *id)
312{
313 struct device *dev = &client->dev;
314 struct ptn3460_bridge *ptn_bridge;
315 struct device_node *endpoint, *panel_node;
316 int ret;
317
318 ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
319 if (!ptn_bridge) {
320 return -ENOMEM;
321 }
322
323 endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
324 if (endpoint) {
325 panel_node = of_graph_get_remote_port_parent(endpoint);
326 if (panel_node) {
327 ptn_bridge->panel = of_drm_find_panel(panel_node);
328 of_node_put(panel_node);
329 if (!ptn_bridge->panel)
330 return -EPROBE_DEFER;
331 }
332 }
333
334 ptn_bridge->client = client;
335
336 ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
337 GPIOD_OUT_HIGH);
338 if (IS_ERR(ptn_bridge->gpio_pd_n)) {
339 ret = PTR_ERR(ptn_bridge->gpio_pd_n);
340 dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
341 return ret;
342 }
343
344 /*
345 * Request the reset pin low to avoid the bridge being
346 * initialized prematurely
347 */
348 ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
349 GPIOD_OUT_LOW);
350 if (IS_ERR(ptn_bridge->gpio_rst_n)) {
351 ret = PTR_ERR(ptn_bridge->gpio_rst_n);
352 DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
353 return ret;
354 }
355
356 ret = of_property_read_u32(dev->of_node, "edid-emulation",
357 &ptn_bridge->edid_emulation);
358 if (ret) {
359 dev_err(dev, "Can't read EDID emulation value\n");
360 return ret;
361 }
362
363 ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
364 ptn_bridge->bridge.of_node = dev->of_node;
365 ret = drm_bridge_add(&ptn_bridge->bridge);
366 if (ret) {
367 DRM_ERROR("Failed to add bridge\n");
368 return ret;
369 }
370
371 i2c_set_clientdata(client, ptn_bridge);
372
373 return 0;
374}
375
376static int ptn3460_remove(struct i2c_client *client)
377{
378 struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
379
380 drm_bridge_remove(&ptn_bridge->bridge);
381
382 return 0;
383}
384
385static const struct i2c_device_id ptn3460_i2c_table[] = {
386 {"ptn3460", 0},
387 {},
388};
389MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
390
391static const struct of_device_id ptn3460_match[] = {
392 { .compatible = "nxp,ptn3460" },
393 {},
394};
395MODULE_DEVICE_TABLE(of, ptn3460_match);
396
397static struct i2c_driver ptn3460_driver = {
398 .id_table = ptn3460_i2c_table,
399 .probe = ptn3460_probe,
400 .remove = ptn3460_remove,
401 .driver = {
402 .name = "nxp,ptn3460",
403 .of_match_table = ptn3460_match,
404 },
405};
406module_i2c_driver(ptn3460_driver);
407
408MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
409MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
410MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * NXP PTN3460 DP/LVDS bridge driver
4 *
5 * Copyright (C) 2013 Google, Inc.
6 */
7
8#include <linux/delay.h>
9#include <linux/gpio/consumer.h>
10#include <linux/i2c.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <drm/drm_atomic_helper.h>
14#include <drm/drm_bridge.h>
15#include <drm/drm_crtc.h>
16#include <drm/drm_edid.h>
17#include <drm/drm_of.h>
18#include <drm/drm_panel.h>
19#include <drm/drm_print.h>
20#include <drm/drm_probe_helper.h>
21
22#define PTN3460_EDID_ADDR 0x0
23#define PTN3460_EDID_EMULATION_ADDR 0x84
24#define PTN3460_EDID_ENABLE_EMULATION 0
25#define PTN3460_EDID_EMULATION_SELECTION 1
26#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
27
28struct ptn3460_bridge {
29 struct drm_connector connector;
30 struct i2c_client *client;
31 struct drm_bridge bridge;
32 struct drm_bridge *panel_bridge;
33 struct gpio_desc *gpio_pd_n;
34 struct gpio_desc *gpio_rst_n;
35 u32 edid_emulation;
36 bool enabled;
37};
38
39static inline struct ptn3460_bridge *
40 bridge_to_ptn3460(struct drm_bridge *bridge)
41{
42 return container_of(bridge, struct ptn3460_bridge, bridge);
43}
44
45static inline struct ptn3460_bridge *
46 connector_to_ptn3460(struct drm_connector *connector)
47{
48 return container_of(connector, struct ptn3460_bridge, connector);
49}
50
51static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
52 u8 *buf, int len)
53{
54 int ret;
55
56 ret = i2c_master_send(ptn_bridge->client, &addr, 1);
57 if (ret <= 0) {
58 DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
59 return ret;
60 }
61
62 ret = i2c_master_recv(ptn_bridge->client, buf, len);
63 if (ret <= 0) {
64 DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
65 return ret;
66 }
67
68 return 0;
69}
70
71static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
72 char val)
73{
74 int ret;
75 char buf[2];
76
77 buf[0] = addr;
78 buf[1] = val;
79
80 ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
81 if (ret <= 0) {
82 DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
83 return ret;
84 }
85
86 return 0;
87}
88
89static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
90{
91 int ret;
92 char val;
93
94 /* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
95 ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
96 ptn_bridge->edid_emulation);
97 if (ret) {
98 DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
99 return ret;
100 }
101
102 /* Enable EDID emulation and select the desired EDID */
103 val = 1 << PTN3460_EDID_ENABLE_EMULATION |
104 ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
105
106 ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
107 if (ret) {
108 DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
109 return ret;
110 }
111
112 return 0;
113}
114
115static void ptn3460_pre_enable(struct drm_bridge *bridge)
116{
117 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
118 int ret;
119
120 if (ptn_bridge->enabled)
121 return;
122
123 gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
124
125 gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
126 usleep_range(10, 20);
127 gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
128
129 /*
130 * There's a bug in the PTN chip where it falsely asserts hotplug before
131 * it is fully functional. We're forced to wait for the maximum start up
132 * time specified in the chip's datasheet to make sure we're really up.
133 */
134 msleep(90);
135
136 ret = ptn3460_select_edid(ptn_bridge);
137 if (ret)
138 DRM_ERROR("Select EDID failed ret=%d\n", ret);
139
140 ptn_bridge->enabled = true;
141}
142
143static void ptn3460_disable(struct drm_bridge *bridge)
144{
145 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
146
147 if (!ptn_bridge->enabled)
148 return;
149
150 ptn_bridge->enabled = false;
151
152 gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
153 gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
154}
155
156
157static struct edid *ptn3460_get_edid(struct drm_bridge *bridge,
158 struct drm_connector *connector)
159{
160 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
161 bool power_off;
162 u8 *edid;
163 int ret;
164
165 power_off = !ptn_bridge->enabled;
166 ptn3460_pre_enable(&ptn_bridge->bridge);
167
168 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
169 if (!edid) {
170 DRM_ERROR("Failed to allocate EDID\n");
171 goto out;
172 }
173
174 ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
175 EDID_LENGTH);
176 if (ret) {
177 kfree(edid);
178 edid = NULL;
179 goto out;
180 }
181
182out:
183 if (power_off)
184 ptn3460_disable(&ptn_bridge->bridge);
185
186 return (struct edid *)edid;
187}
188
189static int ptn3460_connector_get_modes(struct drm_connector *connector)
190{
191 struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
192 struct edid *edid;
193 int num_modes;
194
195 edid = ptn3460_get_edid(&ptn_bridge->bridge, connector);
196 drm_connector_update_edid_property(connector, edid);
197 num_modes = drm_add_edid_modes(connector, edid);
198 kfree(edid);
199
200 return num_modes;
201}
202
203static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
204 .get_modes = ptn3460_connector_get_modes,
205};
206
207static const struct drm_connector_funcs ptn3460_connector_funcs = {
208 .fill_modes = drm_helper_probe_single_connector_modes,
209 .destroy = drm_connector_cleanup,
210 .reset = drm_atomic_helper_connector_reset,
211 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
212 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
213};
214
215static int ptn3460_bridge_attach(struct drm_bridge *bridge,
216 enum drm_bridge_attach_flags flags)
217{
218 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
219 int ret;
220
221 /* Let this driver create connector if requested */
222 ret = drm_bridge_attach(bridge->encoder, ptn_bridge->panel_bridge,
223 bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);
224 if (ret < 0)
225 return ret;
226
227 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
228 return 0;
229
230 if (!bridge->encoder) {
231 DRM_ERROR("Parent encoder object not found");
232 return -ENODEV;
233 }
234
235 ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
236 ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
237 &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
238 if (ret) {
239 DRM_ERROR("Failed to initialize connector with drm\n");
240 return ret;
241 }
242 drm_connector_helper_add(&ptn_bridge->connector,
243 &ptn3460_connector_helper_funcs);
244 drm_connector_register(&ptn_bridge->connector);
245 drm_connector_attach_encoder(&ptn_bridge->connector,
246 bridge->encoder);
247
248 drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
249
250 return ret;
251}
252
253static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
254 .pre_enable = ptn3460_pre_enable,
255 .disable = ptn3460_disable,
256 .attach = ptn3460_bridge_attach,
257 .get_edid = ptn3460_get_edid,
258};
259
260static int ptn3460_probe(struct i2c_client *client,
261 const struct i2c_device_id *id)
262{
263 struct device *dev = &client->dev;
264 struct ptn3460_bridge *ptn_bridge;
265 struct drm_bridge *panel_bridge;
266 struct drm_panel *panel;
267 int ret;
268
269 ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
270 if (!ptn_bridge) {
271 return -ENOMEM;
272 }
273
274 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, NULL);
275 if (ret)
276 return ret;
277
278 panel_bridge = devm_drm_panel_bridge_add(dev, panel);
279 if (IS_ERR(panel_bridge))
280 return PTR_ERR(panel_bridge);
281
282 ptn_bridge->panel_bridge = panel_bridge;
283 ptn_bridge->client = client;
284
285 ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
286 GPIOD_OUT_HIGH);
287 if (IS_ERR(ptn_bridge->gpio_pd_n)) {
288 ret = PTR_ERR(ptn_bridge->gpio_pd_n);
289 dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
290 return ret;
291 }
292
293 /*
294 * Request the reset pin low to avoid the bridge being
295 * initialized prematurely
296 */
297 ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
298 GPIOD_OUT_LOW);
299 if (IS_ERR(ptn_bridge->gpio_rst_n)) {
300 ret = PTR_ERR(ptn_bridge->gpio_rst_n);
301 DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
302 return ret;
303 }
304
305 ret = of_property_read_u32(dev->of_node, "edid-emulation",
306 &ptn_bridge->edid_emulation);
307 if (ret) {
308 dev_err(dev, "Can't read EDID emulation value\n");
309 return ret;
310 }
311
312 ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
313 ptn_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
314 ptn_bridge->bridge.type = DRM_MODE_CONNECTOR_LVDS;
315 ptn_bridge->bridge.of_node = dev->of_node;
316 drm_bridge_add(&ptn_bridge->bridge);
317
318 i2c_set_clientdata(client, ptn_bridge);
319
320 return 0;
321}
322
323static int ptn3460_remove(struct i2c_client *client)
324{
325 struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
326
327 drm_bridge_remove(&ptn_bridge->bridge);
328
329 return 0;
330}
331
332static const struct i2c_device_id ptn3460_i2c_table[] = {
333 {"ptn3460", 0},
334 {},
335};
336MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
337
338static const struct of_device_id ptn3460_match[] = {
339 { .compatible = "nxp,ptn3460" },
340 {},
341};
342MODULE_DEVICE_TABLE(of, ptn3460_match);
343
344static struct i2c_driver ptn3460_driver = {
345 .id_table = ptn3460_i2c_table,
346 .probe = ptn3460_probe,
347 .remove = ptn3460_remove,
348 .driver = {
349 .name = "nxp,ptn3460",
350 .of_match_table = ptn3460_match,
351 },
352};
353module_i2c_driver(ptn3460_driver);
354
355MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
356MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
357MODULE_LICENSE("GPL v2");