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a9fe713d SP |
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/module.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_gpio.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/gpio.h> | |
21 | #include <linux/delay.h> | |
22 | ||
23 | #include "drmP.h" | |
24 | #include "drm_edid.h" | |
25 | #include "drm_crtc.h" | |
26 | #include "drm_crtc_helper.h" | |
27 | ||
28 | #include "bridge/ptn3460.h" | |
29 | ||
30 | #define PTN3460_EDID_ADDR 0x0 | |
31 | #define PTN3460_EDID_EMULATION_ADDR 0x84 | |
32 | #define PTN3460_EDID_ENABLE_EMULATION 0 | |
33 | #define PTN3460_EDID_EMULATION_SELECTION 1 | |
34 | #define PTN3460_EDID_SRAM_LOAD_ADDR 0x85 | |
35 | ||
36 | struct ptn3460_bridge { | |
37 | struct drm_connector connector; | |
38 | struct i2c_client *client; | |
39 | struct drm_encoder *encoder; | |
40 | struct drm_bridge *bridge; | |
41 | struct edid *edid; | |
42 | int gpio_pd_n; | |
43 | int gpio_rst_n; | |
44 | u32 edid_emulation; | |
45 | bool enabled; | |
46 | }; | |
47 | ||
48 | static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr, | |
49 | u8 *buf, int len) | |
50 | { | |
51 | int ret; | |
52 | ||
53 | ret = i2c_master_send(ptn_bridge->client, &addr, 1); | |
54 | if (ret <= 0) { | |
55 | DRM_ERROR("Failed to send i2c command, ret=%d\n", ret); | |
56 | return ret; | |
57 | } | |
58 | ||
59 | ret = i2c_master_recv(ptn_bridge->client, buf, len); | |
60 | if (ret <= 0) { | |
61 | DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret); | |
62 | return ret; | |
63 | } | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr, | |
69 | char val) | |
70 | { | |
71 | int ret; | |
72 | char buf[2]; | |
73 | ||
74 | buf[0] = addr; | |
75 | buf[1] = val; | |
76 | ||
77 | ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf)); | |
78 | if (ret <= 0) { | |
79 | DRM_ERROR("Failed to send i2c command, ret=%d\n", ret); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge) | |
87 | { | |
88 | int ret; | |
89 | char val; | |
90 | ||
91 | /* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */ | |
92 | ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR, | |
93 | ptn_bridge->edid_emulation); | |
94 | if (ret) { | |
95 | DRM_ERROR("Failed to transfer edid to sram, ret=%d\n", ret); | |
96 | return ret; | |
97 | } | |
98 | ||
99 | /* Enable EDID emulation and select the desired EDID */ | |
100 | val = 1 << PTN3460_EDID_ENABLE_EMULATION | | |
101 | ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION; | |
102 | ||
103 | ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val); | |
104 | if (ret) { | |
105 | DRM_ERROR("Failed to write edid value, ret=%d\n", ret); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static void ptn3460_pre_enable(struct drm_bridge *bridge) | |
113 | { | |
114 | struct ptn3460_bridge *ptn_bridge = bridge->driver_private; | |
115 | int ret; | |
116 | ||
117 | if (ptn_bridge->enabled) | |
118 | return; | |
119 | ||
120 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
121 | gpio_set_value(ptn_bridge->gpio_pd_n, 1); | |
122 | ||
123 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) { | |
124 | gpio_set_value(ptn_bridge->gpio_rst_n, 0); | |
125 | udelay(10); | |
126 | gpio_set_value(ptn_bridge->gpio_rst_n, 1); | |
127 | } | |
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 | ||
143 | static void ptn3460_enable(struct drm_bridge *bridge) | |
144 | { | |
145 | } | |
146 | ||
147 | static void ptn3460_disable(struct drm_bridge *bridge) | |
148 | { | |
149 | struct ptn3460_bridge *ptn_bridge = bridge->driver_private; | |
150 | ||
151 | if (!ptn_bridge->enabled) | |
152 | return; | |
153 | ||
154 | ptn_bridge->enabled = false; | |
155 | ||
156 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) | |
157 | gpio_set_value(ptn_bridge->gpio_rst_n, 1); | |
158 | ||
159 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
160 | gpio_set_value(ptn_bridge->gpio_pd_n, 0); | |
161 | } | |
162 | ||
163 | static void ptn3460_post_disable(struct drm_bridge *bridge) | |
164 | { | |
165 | } | |
166 | ||
167 | void ptn3460_bridge_destroy(struct drm_bridge *bridge) | |
168 | { | |
169 | struct ptn3460_bridge *ptn_bridge = bridge->driver_private; | |
170 | ||
171 | drm_bridge_cleanup(bridge); | |
172 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
173 | gpio_free(ptn_bridge->gpio_pd_n); | |
174 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) | |
175 | gpio_free(ptn_bridge->gpio_rst_n); | |
176 | /* Nothing else to free, we've got devm allocated memory */ | |
177 | } | |
178 | ||
179 | struct drm_bridge_funcs ptn3460_bridge_funcs = { | |
180 | .pre_enable = ptn3460_pre_enable, | |
181 | .enable = ptn3460_enable, | |
182 | .disable = ptn3460_disable, | |
183 | .post_disable = ptn3460_post_disable, | |
184 | .destroy = ptn3460_bridge_destroy, | |
185 | }; | |
186 | ||
187 | int ptn3460_get_modes(struct drm_connector *connector) | |
188 | { | |
189 | struct ptn3460_bridge *ptn_bridge; | |
190 | u8 *edid; | |
191 | int ret, num_modes; | |
192 | bool power_off; | |
193 | ||
194 | ptn_bridge = container_of(connector, struct ptn3460_bridge, connector); | |
195 | ||
196 | if (ptn_bridge->edid) | |
197 | return drm_add_edid_modes(connector, ptn_bridge->edid); | |
198 | ||
199 | power_off = !ptn_bridge->enabled; | |
200 | ptn3460_pre_enable(ptn_bridge->bridge); | |
201 | ||
202 | edid = kmalloc(EDID_LENGTH, GFP_KERNEL); | |
203 | if (!edid) { | |
204 | DRM_ERROR("Failed to allocate edid\n"); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid, | |
209 | EDID_LENGTH); | |
210 | if (ret) { | |
211 | kfree(edid); | |
212 | num_modes = 0; | |
213 | goto out; | |
214 | } | |
215 | ||
216 | ptn_bridge->edid = (struct edid *)edid; | |
217 | drm_mode_connector_update_edid_property(connector, ptn_bridge->edid); | |
218 | ||
219 | num_modes = drm_add_edid_modes(connector, ptn_bridge->edid); | |
220 | ||
221 | out: | |
222 | if (power_off) | |
223 | ptn3460_disable(ptn_bridge->bridge); | |
224 | ||
225 | return num_modes; | |
226 | } | |
227 | ||
a9fe713d SP |
228 | struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector) |
229 | { | |
230 | struct ptn3460_bridge *ptn_bridge; | |
231 | ||
232 | ptn_bridge = container_of(connector, struct ptn3460_bridge, connector); | |
233 | ||
234 | return ptn_bridge->encoder; | |
235 | } | |
236 | ||
237 | struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = { | |
238 | .get_modes = ptn3460_get_modes, | |
a9fe713d SP |
239 | .best_encoder = ptn3460_best_encoder, |
240 | }; | |
241 | ||
242 | enum drm_connector_status ptn3460_detect(struct drm_connector *connector, | |
243 | bool force) | |
244 | { | |
245 | return connector_status_connected; | |
246 | } | |
247 | ||
248 | void ptn3460_connector_destroy(struct drm_connector *connector) | |
249 | { | |
250 | drm_connector_cleanup(connector); | |
251 | } | |
252 | ||
253 | struct drm_connector_funcs ptn3460_connector_funcs = { | |
254 | .dpms = drm_helper_connector_dpms, | |
255 | .fill_modes = drm_helper_probe_single_connector_modes, | |
256 | .detect = ptn3460_detect, | |
257 | .destroy = ptn3460_connector_destroy, | |
258 | }; | |
259 | ||
260 | int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder, | |
261 | struct i2c_client *client, struct device_node *node) | |
262 | { | |
263 | int ret; | |
264 | struct drm_bridge *bridge; | |
265 | struct ptn3460_bridge *ptn_bridge; | |
266 | ||
267 | bridge = devm_kzalloc(dev->dev, sizeof(*bridge), GFP_KERNEL); | |
268 | if (!bridge) { | |
269 | DRM_ERROR("Failed to allocate drm bridge\n"); | |
270 | return -ENOMEM; | |
271 | } | |
272 | ||
273 | ptn_bridge = devm_kzalloc(dev->dev, sizeof(*ptn_bridge), GFP_KERNEL); | |
274 | if (!ptn_bridge) { | |
275 | DRM_ERROR("Failed to allocate ptn bridge\n"); | |
276 | return -ENOMEM; | |
277 | } | |
278 | ||
279 | ptn_bridge->client = client; | |
280 | ptn_bridge->encoder = encoder; | |
281 | ptn_bridge->bridge = bridge; | |
282 | ptn_bridge->gpio_pd_n = of_get_named_gpio(node, "powerdown-gpio", 0); | |
283 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) { | |
284 | ret = gpio_request_one(ptn_bridge->gpio_pd_n, | |
285 | GPIOF_OUT_INIT_HIGH, "PTN3460_PD_N"); | |
286 | if (ret) { | |
287 | DRM_ERROR("Request powerdown-gpio failed (%d)\n", ret); | |
288 | return ret; | |
289 | } | |
290 | } | |
291 | ||
292 | ptn_bridge->gpio_rst_n = of_get_named_gpio(node, "reset-gpio", 0); | |
293 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) { | |
294 | /* | |
295 | * Request the reset pin low to avoid the bridge being | |
296 | * initialized prematurely | |
297 | */ | |
298 | ret = gpio_request_one(ptn_bridge->gpio_rst_n, | |
299 | GPIOF_OUT_INIT_LOW, "PTN3460_RST_N"); | |
300 | if (ret) { | |
301 | DRM_ERROR("Request reset-gpio failed (%d)\n", ret); | |
302 | gpio_free(ptn_bridge->gpio_pd_n); | |
303 | return ret; | |
304 | } | |
305 | } | |
306 | ||
307 | ret = of_property_read_u32(node, "edid-emulation", | |
308 | &ptn_bridge->edid_emulation); | |
309 | if (ret) { | |
310 | DRM_ERROR("Can't read edid emulation value\n"); | |
311 | goto err; | |
312 | } | |
313 | ||
314 | ret = drm_bridge_init(dev, bridge, &ptn3460_bridge_funcs); | |
315 | if (ret) { | |
316 | DRM_ERROR("Failed to initialize bridge with drm\n"); | |
317 | goto err; | |
318 | } | |
319 | ||
320 | bridge->driver_private = ptn_bridge; | |
321 | encoder->bridge = bridge; | |
322 | ||
323 | ret = drm_connector_init(dev, &ptn_bridge->connector, | |
324 | &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS); | |
325 | if (ret) { | |
326 | DRM_ERROR("Failed to initialize connector with drm\n"); | |
327 | goto err; | |
328 | } | |
329 | drm_connector_helper_add(&ptn_bridge->connector, | |
330 | &ptn3460_connector_helper_funcs); | |
34ea3d38 | 331 | drm_connector_register(&ptn_bridge->connector); |
a9fe713d SP |
332 | drm_mode_connector_attach_encoder(&ptn_bridge->connector, encoder); |
333 | ||
334 | return 0; | |
335 | ||
336 | err: | |
337 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
338 | gpio_free(ptn_bridge->gpio_pd_n); | |
339 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) | |
340 | gpio_free(ptn_bridge->gpio_rst_n); | |
341 | return ret; | |
342 | } | |
96e112c4 | 343 | EXPORT_SYMBOL(ptn3460_init); |