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_crtc.h>
15#include <drm/drm_edid.h>
16#include <drm/drm_of.h>
17#include <drm/drm_panel.h>
18#include <drm/drm_print.h>
19#include <drm/drm_probe_helper.h>
20
21#define PTN3460_EDID_ADDR 0x0
22#define PTN3460_EDID_EMULATION_ADDR 0x84
23#define PTN3460_EDID_ENABLE_EMULATION 0
24#define PTN3460_EDID_EMULATION_SELECTION 1
25#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
26
27struct ptn3460_bridge {
28 struct drm_connector connector;
29 struct i2c_client *client;
30 struct drm_bridge bridge;
31 struct edid *edid;
32 struct drm_panel *panel;
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 if (drm_panel_prepare(ptn_bridge->panel)) {
130 DRM_ERROR("failed to prepare panel\n");
131 return;
132 }
133
134 /*
135 * There's a bug in the PTN chip where it falsely asserts hotplug before
136 * it is fully functional. We're forced to wait for the maximum start up
137 * time specified in the chip's datasheet to make sure we're really up.
138 */
139 msleep(90);
140
141 ret = ptn3460_select_edid(ptn_bridge);
142 if (ret)
143 DRM_ERROR("Select EDID failed ret=%d\n", ret);
144
145 ptn_bridge->enabled = true;
146}
147
148static void ptn3460_enable(struct drm_bridge *bridge)
149{
150 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
151
152 if (drm_panel_enable(ptn_bridge->panel)) {
153 DRM_ERROR("failed to enable panel\n");
154 return;
155 }
156}
157
158static void ptn3460_disable(struct drm_bridge *bridge)
159{
160 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
161
162 if (!ptn_bridge->enabled)
163 return;
164
165 ptn_bridge->enabled = false;
166
167 if (drm_panel_disable(ptn_bridge->panel)) {
168 DRM_ERROR("failed to disable panel\n");
169 return;
170 }
171
172 gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
173 gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
174}
175
176static void ptn3460_post_disable(struct drm_bridge *bridge)
177{
178 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
179
180 if (drm_panel_unprepare(ptn_bridge->panel)) {
181 DRM_ERROR("failed to unprepare panel\n");
182 return;
183 }
184}
185
186static int ptn3460_get_modes(struct drm_connector *connector)
187{
188 struct ptn3460_bridge *ptn_bridge;
189 u8 *edid;
190 int ret, num_modes = 0;
191 bool power_off;
192
193 ptn_bridge = connector_to_ptn3460(connector);
194
195 if (ptn_bridge->edid)
196 return drm_add_edid_modes(connector, ptn_bridge->edid);
197
198 power_off = !ptn_bridge->enabled;
199 ptn3460_pre_enable(&ptn_bridge->bridge);
200
201 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
202 if (!edid) {
203 DRM_ERROR("Failed to allocate EDID\n");
204 return 0;
205 }
206
207 ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
208 EDID_LENGTH);
209 if (ret) {
210 kfree(edid);
211 goto out;
212 }
213
214 ptn_bridge->edid = (struct edid *)edid;
215 drm_connector_update_edid_property(connector, ptn_bridge->edid);
216
217 num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
218
219out:
220 if (power_off)
221 ptn3460_disable(&ptn_bridge->bridge);
222
223 return num_modes;
224}
225
226static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
227 .get_modes = ptn3460_get_modes,
228};
229
230static const struct drm_connector_funcs ptn3460_connector_funcs = {
231 .fill_modes = drm_helper_probe_single_connector_modes,
232 .destroy = drm_connector_cleanup,
233 .reset = drm_atomic_helper_connector_reset,
234 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
235 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
236};
237
238static int ptn3460_bridge_attach(struct drm_bridge *bridge)
239{
240 struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
241 int ret;
242
243 if (!bridge->encoder) {
244 DRM_ERROR("Parent encoder object not found");
245 return -ENODEV;
246 }
247
248 ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
249 ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
250 &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
251 if (ret) {
252 DRM_ERROR("Failed to initialize connector with drm\n");
253 return ret;
254 }
255 drm_connector_helper_add(&ptn_bridge->connector,
256 &ptn3460_connector_helper_funcs);
257 drm_connector_register(&ptn_bridge->connector);
258 drm_connector_attach_encoder(&ptn_bridge->connector,
259 bridge->encoder);
260
261 if (ptn_bridge->panel)
262 drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
263
264 drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
265
266 return ret;
267}
268
269static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
270 .pre_enable = ptn3460_pre_enable,
271 .enable = ptn3460_enable,
272 .disable = ptn3460_disable,
273 .post_disable = ptn3460_post_disable,
274 .attach = ptn3460_bridge_attach,
275};
276
277static int ptn3460_probe(struct i2c_client *client,
278 const struct i2c_device_id *id)
279{
280 struct device *dev = &client->dev;
281 struct ptn3460_bridge *ptn_bridge;
282 int ret;
283
284 ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
285 if (!ptn_bridge) {
286 return -ENOMEM;
287 }
288
289 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
290 if (ret)
291 return ret;
292
293 ptn_bridge->client = client;
294
295 ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
296 GPIOD_OUT_HIGH);
297 if (IS_ERR(ptn_bridge->gpio_pd_n)) {
298 ret = PTR_ERR(ptn_bridge->gpio_pd_n);
299 dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
300 return ret;
301 }
302
303 /*
304 * Request the reset pin low to avoid the bridge being
305 * initialized prematurely
306 */
307 ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
308 GPIOD_OUT_LOW);
309 if (IS_ERR(ptn_bridge->gpio_rst_n)) {
310 ret = PTR_ERR(ptn_bridge->gpio_rst_n);
311 DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
312 return ret;
313 }
314
315 ret = of_property_read_u32(dev->of_node, "edid-emulation",
316 &ptn_bridge->edid_emulation);
317 if (ret) {
318 dev_err(dev, "Can't read EDID emulation value\n");
319 return ret;
320 }
321
322 ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
323 ptn_bridge->bridge.of_node = dev->of_node;
324 drm_bridge_add(&ptn_bridge->bridge);
325
326 i2c_set_clientdata(client, ptn_bridge);
327
328 return 0;
329}
330
331static int ptn3460_remove(struct i2c_client *client)
332{
333 struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
334
335 drm_bridge_remove(&ptn_bridge->bridge);
336
337 return 0;
338}
339
340static const struct i2c_device_id ptn3460_i2c_table[] = {
341 {"ptn3460", 0},
342 {},
343};
344MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
345
346static const struct of_device_id ptn3460_match[] = {
347 { .compatible = "nxp,ptn3460" },
348 {},
349};
350MODULE_DEVICE_TABLE(of, ptn3460_match);
351
352static struct i2c_driver ptn3460_driver = {
353 .id_table = ptn3460_i2c_table,
354 .probe = ptn3460_probe,
355 .remove = ptn3460_remove,
356 .driver = {
357 .name = "nxp,ptn3460",
358 .of_match_table = ptn3460_match,
359 },
360};
361module_i2c_driver(ptn3460_driver);
362
363MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
364MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
365MODULE_LICENSE("GPL v2");