This source file includes following definitions.
- bridge_to_ptn3460
- connector_to_ptn3460
- ptn3460_read_bytes
- ptn3460_write_byte
- ptn3460_select_edid
- ptn3460_pre_enable
- ptn3460_enable
- ptn3460_disable
- ptn3460_post_disable
- ptn3460_get_modes
- ptn3460_bridge_attach
- ptn3460_probe
- ptn3460_remove
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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
27 struct 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
39 static inline struct ptn3460_bridge *
40 bridge_to_ptn3460(struct drm_bridge *bridge)
41 {
42 return container_of(bridge, struct ptn3460_bridge, bridge);
43 }
44
45 static inline struct ptn3460_bridge *
46 connector_to_ptn3460(struct drm_connector *connector)
47 {
48 return container_of(connector, struct ptn3460_bridge, connector);
49 }
50
51 static 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
71 static 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
89 static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
90 {
91 int ret;
92 char val;
93
94
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
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
115 static 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
136
137
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
148 static 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
158 static 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
176 static 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
186 static 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
219 out:
220 if (power_off)
221 ptn3460_disable(&ptn_bridge->bridge);
222
223 return num_modes;
224 }
225
226 static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
227 .get_modes = ptn3460_get_modes,
228 };
229
230 static 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
238 static 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
269 static 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
277 static 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
305
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
331 static 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
340 static const struct i2c_device_id ptn3460_i2c_table[] = {
341 {"ptn3460", 0},
342 {},
343 };
344 MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
345
346 static const struct of_device_id ptn3460_match[] = {
347 { .compatible = "nxp,ptn3460" },
348 {},
349 };
350 MODULE_DEVICE_TABLE(of, ptn3460_match);
351
352 static 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 };
361 module_i2c_driver(ptn3460_driver);
362
363 MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
364 MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
365 MODULE_LICENSE("GPL v2");