Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Parade PS8622 eDP/LVDS bridge driver |
| 3 | * |
| 4 | * Copyright (C) 2014 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/backlight.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/fb.h> |
| 20 | #include <linux/gpio.h> |
| 21 | #include <linux/i2c.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/of_device.h> |
| 25 | #include <linux/of_graph.h> |
| 26 | #include <linux/pm.h> |
| 27 | #include <linux/regulator/consumer.h> |
| 28 | |
| 29 | #include <drm/drm_panel.h> |
| 30 | |
| 31 | #include "drmP.h" |
| 32 | #include "drm_crtc.h" |
| 33 | #include "drm_crtc_helper.h" |
| 34 | |
| 35 | /* Brightness scale on the Parade chip */ |
| 36 | #define PS8622_MAX_BRIGHTNESS 0xff |
| 37 | |
| 38 | /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ |
| 39 | #define PS8622_POWER_RISE_T1_MIN_US 10 |
| 40 | #define PS8622_POWER_RISE_T1_MAX_US 10000 |
| 41 | #define PS8622_RST_HIGH_T2_MIN_US 3000 |
| 42 | #define PS8622_RST_HIGH_T2_MAX_US 30000 |
| 43 | #define PS8622_PWMO_END_T12_MS 200 |
| 44 | #define PS8622_POWER_FALL_T16_MAX_US 10000 |
| 45 | #define PS8622_POWER_OFF_T17_MS 500 |
| 46 | |
| 47 | #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ |
| 48 | (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) |
| 49 | #error "T2.min + T1.max must be less than T2.max + T1.min" |
| 50 | #endif |
| 51 | |
| 52 | struct ps8622_bridge { |
| 53 | struct drm_connector connector; |
| 54 | struct i2c_client *client; |
| 55 | struct drm_bridge bridge; |
| 56 | struct drm_panel *panel; |
| 57 | struct regulator *v12; |
| 58 | struct backlight_device *bl; |
| 59 | |
| 60 | struct gpio_desc *gpio_slp; |
| 61 | struct gpio_desc *gpio_rst; |
| 62 | |
| 63 | u32 max_lane_count; |
| 64 | u32 lane_count; |
| 65 | |
| 66 | bool enabled; |
| 67 | }; |
| 68 | |
| 69 | static inline struct ps8622_bridge * |
| 70 | bridge_to_ps8622(struct drm_bridge *bridge) |
| 71 | { |
| 72 | return container_of(bridge, struct ps8622_bridge, bridge); |
| 73 | } |
| 74 | |
| 75 | static inline struct ps8622_bridge * |
| 76 | connector_to_ps8622(struct drm_connector *connector) |
| 77 | { |
| 78 | return container_of(connector, struct ps8622_bridge, connector); |
| 79 | } |
| 80 | |
| 81 | static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) |
| 82 | { |
| 83 | int ret; |
| 84 | struct i2c_adapter *adap = client->adapter; |
| 85 | struct i2c_msg msg; |
| 86 | u8 data[] = {reg, val}; |
| 87 | |
| 88 | msg.addr = client->addr + page; |
| 89 | msg.flags = 0; |
| 90 | msg.len = sizeof(data); |
| 91 | msg.buf = data; |
| 92 | |
| 93 | ret = i2c_transfer(adap, &msg, 1); |
| 94 | if (ret != 1) |
| 95 | pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", |
| 96 | client->addr + page, reg, val, ret); |
| 97 | return !(ret == 1); |
| 98 | } |
| 99 | |
| 100 | static int ps8622_send_config(struct ps8622_bridge *ps8622) |
| 101 | { |
| 102 | struct i2c_client *cl = ps8622->client; |
| 103 | int err = 0; |
| 104 | |
| 105 | /* HPD low */ |
| 106 | err = ps8622_set(cl, 0x02, 0xa1, 0x01); |
| 107 | if (err) |
| 108 | goto error; |
| 109 | |
| 110 | /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ |
| 111 | err = ps8622_set(cl, 0x04, 0x14, 0x01); |
| 112 | if (err) |
| 113 | goto error; |
| 114 | |
| 115 | /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ |
| 116 | err = ps8622_set(cl, 0x04, 0xe3, 0x20); |
| 117 | if (err) |
| 118 | goto error; |
| 119 | |
| 120 | /* [7] RCO SS enable */ |
| 121 | err = ps8622_set(cl, 0x04, 0xe2, 0x80); |
| 122 | if (err) |
| 123 | goto error; |
| 124 | |
| 125 | /* RPHY Setting |
| 126 | * [3:2] CDR tune wait cycle before measure for fine tune |
| 127 | * b00: 1us b01: 0.5us b10:2us, b11: 4us |
| 128 | */ |
| 129 | err = ps8622_set(cl, 0x04, 0x8a, 0x0c); |
| 130 | if (err) |
| 131 | goto error; |
| 132 | |
| 133 | /* [3] RFD always on */ |
| 134 | err = ps8622_set(cl, 0x04, 0x89, 0x08); |
| 135 | if (err) |
| 136 | goto error; |
| 137 | |
| 138 | /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ |
| 139 | err = ps8622_set(cl, 0x04, 0x71, 0x2d); |
| 140 | if (err) |
| 141 | goto error; |
| 142 | |
| 143 | /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ |
| 144 | err = ps8622_set(cl, 0x04, 0x7d, 0x07); |
| 145 | if (err) |
| 146 | goto error; |
| 147 | |
| 148 | /* [1:0] Fmin=+4bands */ |
| 149 | err = ps8622_set(cl, 0x04, 0x7b, 0x00); |
| 150 | if (err) |
| 151 | goto error; |
| 152 | |
| 153 | /* [7:5] DCO_FTRNG=+-40% */ |
| 154 | err = ps8622_set(cl, 0x04, 0x7a, 0xfd); |
| 155 | if (err) |
| 156 | goto error; |
| 157 | |
| 158 | /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ |
| 159 | err = ps8622_set(cl, 0x04, 0xc0, 0x12); |
| 160 | if (err) |
| 161 | goto error; |
| 162 | |
| 163 | /* Gitune=-37% */ |
| 164 | err = ps8622_set(cl, 0x04, 0xc1, 0x92); |
| 165 | if (err) |
| 166 | goto error; |
| 167 | |
| 168 | /* Fbstep=100% */ |
| 169 | err = ps8622_set(cl, 0x04, 0xc2, 0x1c); |
| 170 | if (err) |
| 171 | goto error; |
| 172 | |
| 173 | /* [7] LOS signal disable */ |
| 174 | err = ps8622_set(cl, 0x04, 0x32, 0x80); |
| 175 | if (err) |
| 176 | goto error; |
| 177 | |
| 178 | /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ |
| 179 | err = ps8622_set(cl, 0x04, 0x00, 0xb0); |
| 180 | if (err) |
| 181 | goto error; |
| 182 | |
| 183 | /* [7:6] Right-bar GPIO output strength is 8mA */ |
| 184 | err = ps8622_set(cl, 0x04, 0x15, 0x40); |
| 185 | if (err) |
| 186 | goto error; |
| 187 | |
| 188 | /* EQ Training State Machine Setting, RCO calibration start */ |
| 189 | err = ps8622_set(cl, 0x04, 0x54, 0x10); |
| 190 | if (err) |
| 191 | goto error; |
| 192 | |
| 193 | /* Logic, needs more than 10 I2C command */ |
| 194 | /* [4:0] MAX_LANE_COUNT set to max supported lanes */ |
| 195 | err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); |
| 196 | if (err) |
| 197 | goto error; |
| 198 | |
| 199 | /* [4:0] LANE_COUNT_SET set to chosen lane count */ |
| 200 | err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); |
| 201 | if (err) |
| 202 | goto error; |
| 203 | |
| 204 | err = ps8622_set(cl, 0x00, 0x52, 0x20); |
| 205 | if (err) |
| 206 | goto error; |
| 207 | |
| 208 | /* HPD CP toggle enable */ |
| 209 | err = ps8622_set(cl, 0x00, 0xf1, 0x03); |
| 210 | if (err) |
| 211 | goto error; |
| 212 | |
| 213 | err = ps8622_set(cl, 0x00, 0x62, 0x41); |
| 214 | if (err) |
| 215 | goto error; |
| 216 | |
| 217 | /* Counter number, add 1ms counter delay */ |
| 218 | err = ps8622_set(cl, 0x00, 0xf6, 0x01); |
| 219 | if (err) |
| 220 | goto error; |
| 221 | |
| 222 | /* [6]PWM function control by DPCD0040f[7], default is PWM block */ |
| 223 | err = ps8622_set(cl, 0x00, 0x77, 0x06); |
| 224 | if (err) |
| 225 | goto error; |
| 226 | |
| 227 | /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ |
| 228 | err = ps8622_set(cl, 0x00, 0x4c, 0x04); |
| 229 | if (err) |
| 230 | goto error; |
| 231 | |
| 232 | /* DPCD00400='h00, Parade OUI ='h001cf8 */ |
| 233 | err = ps8622_set(cl, 0x01, 0xc0, 0x00); |
| 234 | if (err) |
| 235 | goto error; |
| 236 | |
| 237 | /* DPCD00401='h1c */ |
| 238 | err = ps8622_set(cl, 0x01, 0xc1, 0x1c); |
| 239 | if (err) |
| 240 | goto error; |
| 241 | |
| 242 | /* DPCD00402='hf8 */ |
| 243 | err = ps8622_set(cl, 0x01, 0xc2, 0xf8); |
| 244 | if (err) |
| 245 | goto error; |
| 246 | |
| 247 | /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ |
| 248 | err = ps8622_set(cl, 0x01, 0xc3, 0x44); |
| 249 | if (err) |
| 250 | goto error; |
| 251 | |
| 252 | /* DPCD404 */ |
| 253 | err = ps8622_set(cl, 0x01, 0xc4, 0x32); |
| 254 | if (err) |
| 255 | goto error; |
| 256 | |
| 257 | /* DPCD405 */ |
| 258 | err = ps8622_set(cl, 0x01, 0xc5, 0x53); |
| 259 | if (err) |
| 260 | goto error; |
| 261 | |
| 262 | /* DPCD406 */ |
| 263 | err = ps8622_set(cl, 0x01, 0xc6, 0x4c); |
| 264 | if (err) |
| 265 | goto error; |
| 266 | |
| 267 | /* DPCD407 */ |
| 268 | err = ps8622_set(cl, 0x01, 0xc7, 0x56); |
| 269 | if (err) |
| 270 | goto error; |
| 271 | |
| 272 | /* DPCD408 */ |
| 273 | err = ps8622_set(cl, 0x01, 0xc8, 0x35); |
| 274 | if (err) |
| 275 | goto error; |
| 276 | |
| 277 | /* DPCD40A, Initial Code major revision '01' */ |
| 278 | err = ps8622_set(cl, 0x01, 0xca, 0x01); |
| 279 | if (err) |
| 280 | goto error; |
| 281 | |
| 282 | /* DPCD40B, Initial Code minor revision '05' */ |
| 283 | err = ps8622_set(cl, 0x01, 0xcb, 0x05); |
| 284 | if (err) |
| 285 | goto error; |
| 286 | |
| 287 | |
| 288 | if (ps8622->bl) { |
| 289 | /* DPCD720, internal PWM */ |
| 290 | err = ps8622_set(cl, 0x01, 0xa5, 0xa0); |
| 291 | if (err) |
| 292 | goto error; |
| 293 | |
| 294 | /* FFh for 100% brightness, 0h for 0% brightness */ |
| 295 | err = ps8622_set(cl, 0x01, 0xa7, |
| 296 | ps8622->bl->props.brightness); |
| 297 | if (err) |
| 298 | goto error; |
| 299 | } else { |
| 300 | /* DPCD720, external PWM */ |
| 301 | err = ps8622_set(cl, 0x01, 0xa5, 0x80); |
| 302 | if (err) |
| 303 | goto error; |
| 304 | } |
| 305 | |
| 306 | /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ |
| 307 | err = ps8622_set(cl, 0x01, 0xcc, 0x13); |
| 308 | if (err) |
| 309 | goto error; |
| 310 | |
| 311 | /* Enable SSC set by register */ |
| 312 | err = ps8622_set(cl, 0x02, 0xb1, 0x20); |
| 313 | if (err) |
| 314 | goto error; |
| 315 | |
| 316 | /* Set SSC enabled and +/-1% central spreading */ |
| 317 | err = ps8622_set(cl, 0x04, 0x10, 0x16); |
| 318 | if (err) |
| 319 | goto error; |
| 320 | |
| 321 | /* Logic end */ |
| 322 | /* MPU Clock source: LC => RCO */ |
| 323 | err = ps8622_set(cl, 0x04, 0x59, 0x60); |
| 324 | if (err) |
| 325 | goto error; |
| 326 | |
| 327 | /* LC -> RCO */ |
| 328 | err = ps8622_set(cl, 0x04, 0x54, 0x14); |
| 329 | if (err) |
| 330 | goto error; |
| 331 | |
| 332 | /* HPD high */ |
| 333 | err = ps8622_set(cl, 0x02, 0xa1, 0x91); |
| 334 | |
| 335 | error: |
| 336 | return err ? -EIO : 0; |
| 337 | } |
| 338 | |
| 339 | static int ps8622_backlight_update(struct backlight_device *bl) |
| 340 | { |
| 341 | struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); |
| 342 | int ret, brightness = bl->props.brightness; |
| 343 | |
| 344 | if (bl->props.power != FB_BLANK_UNBLANK || |
| 345 | bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) |
| 346 | brightness = 0; |
| 347 | |
| 348 | if (!ps8622->enabled) |
| 349 | return -EINVAL; |
| 350 | |
| 351 | ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); |
| 352 | |
| 353 | return ret; |
| 354 | } |
| 355 | |
| 356 | static const struct backlight_ops ps8622_backlight_ops = { |
| 357 | .update_status = ps8622_backlight_update, |
| 358 | }; |
| 359 | |
| 360 | static void ps8622_pre_enable(struct drm_bridge *bridge) |
| 361 | { |
| 362 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 363 | int ret; |
| 364 | |
| 365 | if (ps8622->enabled) |
| 366 | return; |
| 367 | |
| 368 | gpiod_set_value(ps8622->gpio_rst, 0); |
| 369 | |
| 370 | if (ps8622->v12) { |
| 371 | ret = regulator_enable(ps8622->v12); |
| 372 | if (ret) |
| 373 | DRM_ERROR("fails to enable ps8622->v12"); |
| 374 | } |
| 375 | |
| 376 | if (drm_panel_prepare(ps8622->panel)) { |
| 377 | DRM_ERROR("failed to prepare panel\n"); |
| 378 | return; |
| 379 | } |
| 380 | |
| 381 | gpiod_set_value(ps8622->gpio_slp, 1); |
| 382 | |
| 383 | /* |
| 384 | * T1 is the range of time that it takes for the power to rise after we |
| 385 | * enable the lcd/ps8622 fet. T2 is the range of time in which the |
| 386 | * data sheet specifies we should deassert the reset pin. |
| 387 | * |
| 388 | * If it takes T1.max for the power to rise, we need to wait atleast |
| 389 | * T2.min before deasserting the reset pin. If it takes T1.min for the |
| 390 | * power to rise, we need to wait at most T2.max before deasserting the |
| 391 | * reset pin. |
| 392 | */ |
| 393 | usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, |
| 394 | PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); |
| 395 | |
| 396 | gpiod_set_value(ps8622->gpio_rst, 1); |
| 397 | |
| 398 | /* wait 20ms after RST high */ |
| 399 | usleep_range(20000, 30000); |
| 400 | |
| 401 | ret = ps8622_send_config(ps8622); |
| 402 | if (ret) { |
| 403 | DRM_ERROR("Failed to send config to bridge (%d)\n", ret); |
| 404 | return; |
| 405 | } |
| 406 | |
| 407 | ps8622->enabled = true; |
| 408 | } |
| 409 | |
| 410 | static void ps8622_enable(struct drm_bridge *bridge) |
| 411 | { |
| 412 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 413 | |
| 414 | if (drm_panel_enable(ps8622->panel)) { |
| 415 | DRM_ERROR("failed to enable panel\n"); |
| 416 | return; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | static void ps8622_disable(struct drm_bridge *bridge) |
| 421 | { |
| 422 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 423 | |
| 424 | if (drm_panel_disable(ps8622->panel)) { |
| 425 | DRM_ERROR("failed to disable panel\n"); |
| 426 | return; |
| 427 | } |
| 428 | msleep(PS8622_PWMO_END_T12_MS); |
| 429 | } |
| 430 | |
| 431 | static void ps8622_post_disable(struct drm_bridge *bridge) |
| 432 | { |
| 433 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 434 | |
| 435 | if (!ps8622->enabled) |
| 436 | return; |
| 437 | |
| 438 | ps8622->enabled = false; |
| 439 | |
| 440 | /* |
| 441 | * This doesn't matter if the regulators are turned off, but something |
| 442 | * else might keep them on. In that case, we want to assert the slp gpio |
| 443 | * to lower power. |
| 444 | */ |
| 445 | gpiod_set_value(ps8622->gpio_slp, 0); |
| 446 | |
| 447 | if (drm_panel_unprepare(ps8622->panel)) { |
| 448 | DRM_ERROR("failed to unprepare panel\n"); |
| 449 | return; |
| 450 | } |
| 451 | |
| 452 | if (ps8622->v12) |
| 453 | regulator_disable(ps8622->v12); |
| 454 | |
| 455 | /* |
| 456 | * Sleep for at least the amount of time that it takes the power rail to |
| 457 | * fall to prevent asserting the rst gpio from doing anything. |
| 458 | */ |
| 459 | usleep_range(PS8622_POWER_FALL_T16_MAX_US, |
| 460 | 2 * PS8622_POWER_FALL_T16_MAX_US); |
| 461 | gpiod_set_value(ps8622->gpio_rst, 0); |
| 462 | |
| 463 | msleep(PS8622_POWER_OFF_T17_MS); |
| 464 | } |
| 465 | |
| 466 | static int ps8622_get_modes(struct drm_connector *connector) |
| 467 | { |
| 468 | struct ps8622_bridge *ps8622; |
| 469 | |
| 470 | ps8622 = connector_to_ps8622(connector); |
| 471 | |
| 472 | return drm_panel_get_modes(ps8622->panel); |
| 473 | } |
| 474 | |
| 475 | static struct drm_encoder *ps8622_best_encoder(struct drm_connector *connector) |
| 476 | { |
| 477 | struct ps8622_bridge *ps8622; |
| 478 | |
| 479 | ps8622 = connector_to_ps8622(connector); |
| 480 | |
| 481 | return ps8622->bridge.encoder; |
| 482 | } |
| 483 | |
| 484 | static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { |
| 485 | .get_modes = ps8622_get_modes, |
| 486 | .best_encoder = ps8622_best_encoder, |
| 487 | }; |
| 488 | |
| 489 | static enum drm_connector_status ps8622_detect(struct drm_connector *connector, |
| 490 | bool force) |
| 491 | { |
| 492 | return connector_status_connected; |
| 493 | } |
| 494 | |
| 495 | static void ps8622_connector_destroy(struct drm_connector *connector) |
| 496 | { |
| 497 | drm_connector_cleanup(connector); |
| 498 | } |
| 499 | |
| 500 | static const struct drm_connector_funcs ps8622_connector_funcs = { |
| 501 | .dpms = drm_helper_connector_dpms, |
| 502 | .fill_modes = drm_helper_probe_single_connector_modes, |
| 503 | .detect = ps8622_detect, |
| 504 | .destroy = ps8622_connector_destroy, |
| 505 | }; |
| 506 | |
Thierry Reding | 8a7d56b | 2015-01-30 12:29:09 +0100 | [diff] [blame] | 507 | static int ps8622_attach(struct drm_bridge *bridge) |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 508 | { |
| 509 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 510 | int ret; |
| 511 | |
| 512 | if (!bridge->encoder) { |
| 513 | DRM_ERROR("Parent encoder object not found"); |
| 514 | return -ENODEV; |
| 515 | } |
| 516 | |
| 517 | ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; |
| 518 | ret = drm_connector_init(bridge->dev, &ps8622->connector, |
| 519 | &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); |
| 520 | if (ret) { |
| 521 | DRM_ERROR("Failed to initialize connector with drm\n"); |
| 522 | return ret; |
| 523 | } |
| 524 | drm_connector_helper_add(&ps8622->connector, |
| 525 | &ps8622_connector_helper_funcs); |
| 526 | drm_connector_register(&ps8622->connector); |
| 527 | drm_mode_connector_attach_encoder(&ps8622->connector, |
| 528 | bridge->encoder); |
| 529 | |
| 530 | if (ps8622->panel) |
| 531 | drm_panel_attach(ps8622->panel, &ps8622->connector); |
| 532 | |
| 533 | drm_helper_hpd_irq_event(ps8622->connector.dev); |
| 534 | |
| 535 | return ret; |
| 536 | } |
| 537 | |
| 538 | static const struct drm_bridge_funcs ps8622_bridge_funcs = { |
| 539 | .pre_enable = ps8622_pre_enable, |
| 540 | .enable = ps8622_enable, |
| 541 | .disable = ps8622_disable, |
| 542 | .post_disable = ps8622_post_disable, |
| 543 | .attach = ps8622_attach, |
| 544 | }; |
| 545 | |
| 546 | static const struct of_device_id ps8622_devices[] = { |
| 547 | {.compatible = "parade,ps8622",}, |
| 548 | {.compatible = "parade,ps8625",}, |
| 549 | {} |
| 550 | }; |
| 551 | MODULE_DEVICE_TABLE(of, ps8622_devices); |
| 552 | |
| 553 | static int ps8622_probe(struct i2c_client *client, |
| 554 | const struct i2c_device_id *id) |
| 555 | { |
| 556 | struct device *dev = &client->dev; |
| 557 | struct device_node *endpoint, *panel_node; |
| 558 | struct ps8622_bridge *ps8622; |
| 559 | int ret; |
| 560 | |
| 561 | ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); |
| 562 | if (!ps8622) |
| 563 | return -ENOMEM; |
| 564 | |
| 565 | endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); |
| 566 | if (endpoint) { |
| 567 | panel_node = of_graph_get_remote_port_parent(endpoint); |
| 568 | if (panel_node) { |
| 569 | ps8622->panel = of_drm_find_panel(panel_node); |
| 570 | of_node_put(panel_node); |
| 571 | if (!ps8622->panel) |
| 572 | return -EPROBE_DEFER; |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | ps8622->client = client; |
| 577 | |
| 578 | ps8622->v12 = devm_regulator_get(dev, "vdd12"); |
| 579 | if (IS_ERR(ps8622->v12)) { |
| 580 | dev_info(dev, "no 1.2v regulator found for PS8622\n"); |
| 581 | ps8622->v12 = NULL; |
| 582 | } |
| 583 | |
Uwe Kleine-König | a92bf30 | 2015-05-19 09:03:49 +0200 | [diff] [blame^] | 584 | ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 585 | if (IS_ERR(ps8622->gpio_slp)) { |
| 586 | ret = PTR_ERR(ps8622->gpio_slp); |
| 587 | dev_err(dev, "cannot get gpio_slp %d\n", ret); |
| 588 | return ret; |
| 589 | } |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 590 | |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 591 | /* |
| 592 | * Assert the reset pin high to avoid the bridge being |
| 593 | * initialized prematurely |
| 594 | */ |
Uwe Kleine-König | a92bf30 | 2015-05-19 09:03:49 +0200 | [diff] [blame^] | 595 | ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); |
| 596 | if (IS_ERR(ps8622->gpio_rst)) { |
| 597 | ret = PTR_ERR(ps8622->gpio_rst); |
| 598 | dev_err(dev, "cannot get gpio_rst %d\n", ret); |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 599 | return ret; |
| 600 | } |
| 601 | |
| 602 | ps8622->max_lane_count = id->driver_data; |
| 603 | |
| 604 | if (of_property_read_u32(dev->of_node, "lane-count", |
| 605 | &ps8622->lane_count)) { |
| 606 | ps8622->lane_count = ps8622->max_lane_count; |
| 607 | } else if (ps8622->lane_count > ps8622->max_lane_count) { |
| 608 | dev_info(dev, "lane-count property is too high," |
| 609 | "using max_lane_count\n"); |
| 610 | ps8622->lane_count = ps8622->max_lane_count; |
| 611 | } |
| 612 | |
| 613 | if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { |
| 614 | ps8622->bl = backlight_device_register("ps8622-backlight", |
| 615 | dev, ps8622, &ps8622_backlight_ops, |
| 616 | NULL); |
| 617 | if (IS_ERR(ps8622->bl)) { |
| 618 | DRM_ERROR("failed to register backlight\n"); |
| 619 | ret = PTR_ERR(ps8622->bl); |
| 620 | ps8622->bl = NULL; |
| 621 | return ret; |
| 622 | } |
| 623 | ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; |
| 624 | ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; |
| 625 | } |
| 626 | |
| 627 | ps8622->bridge.funcs = &ps8622_bridge_funcs; |
| 628 | ps8622->bridge.of_node = dev->of_node; |
| 629 | ret = drm_bridge_add(&ps8622->bridge); |
| 630 | if (ret) { |
| 631 | DRM_ERROR("Failed to add bridge\n"); |
| 632 | return ret; |
| 633 | } |
| 634 | |
| 635 | i2c_set_clientdata(client, ps8622); |
| 636 | |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | static int ps8622_remove(struct i2c_client *client) |
| 641 | { |
| 642 | struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); |
| 643 | |
| 644 | if (ps8622->bl) |
| 645 | backlight_device_unregister(ps8622->bl); |
| 646 | |
| 647 | drm_bridge_remove(&ps8622->bridge); |
| 648 | |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | static const struct i2c_device_id ps8622_i2c_table[] = { |
| 653 | /* Device type, max_lane_count */ |
| 654 | {"ps8622", 1}, |
| 655 | {"ps8625", 2}, |
| 656 | {}, |
| 657 | }; |
| 658 | MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); |
| 659 | |
Thierry Reding | 8a7d56b | 2015-01-30 12:29:09 +0100 | [diff] [blame] | 660 | static struct i2c_driver ps8622_driver = { |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 661 | .id_table = ps8622_i2c_table, |
| 662 | .probe = ps8622_probe, |
| 663 | .remove = ps8622_remove, |
| 664 | .driver = { |
| 665 | .name = "ps8622", |
| 666 | .owner = THIS_MODULE, |
| 667 | .of_match_table = ps8622_devices, |
| 668 | }, |
| 669 | }; |
| 670 | module_i2c_driver(ps8622_driver); |
| 671 | |
| 672 | MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); |
| 673 | MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); |
| 674 | MODULE_LICENSE("GPL v2"); |