drivers/video/fbdev/omap2/displays-new/panel-lgphilips-lb035q02.c

   1 /*
   2  * LG.Philips LB035Q02 LCD Panel driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments
   5  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   6  * Based on a driver by: Steve Sakoman <steve@sakoman.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/delay.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/mutex.h>
  17 #include <linux/gpio.h>
  18
  19 #include <video/omapdss.h>
  20 #include <video/omap-panel-data.h>
  21
  22 static struct omap_video_timings lb035q02_timings = {
  23         .x_res = 320,
  24         .y_res = 240,
  25
  26         .pixelclock     = 6500000,
  27
  28         .hsw            = 2,
  29         .hfp            = 20,
  30         .hbp            = 68,
  31
  32         .vsw            = 2,
  33         .vfp            = 4,
  34         .vbp            = 18,
  35
  36         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  37         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  38         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  39         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  40         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
  41 };
  42
  43 struct panel_drv_data {
  44         struct omap_dss_device dssdev;
  45         struct omap_dss_device *in;
  46
  47         struct spi_device *spi;
  48
  49         int data_lines;
  50
  51         struct omap_video_timings videomode;
  52
  53         /* used for non-DT boot, to be removed */
  54         int backlight_gpio;
  55
  56         struct gpio_desc *enable_gpio;
  57 };
  58
  59 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  60
  61 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
  62 {
  63         struct spi_message msg;
  64         struct spi_transfer index_xfer = {
  65                 .len            = 3,
  66                 .cs_change      = 1,
  67         };
  68         struct spi_transfer value_xfer = {
  69                 .len            = 3,
  70         };
  71         u8      buffer[16];
  72
  73         spi_message_init(&msg);
  74
  75         /* register index */
  76         buffer[0] = 0x70;
  77         buffer[1] = 0x00;
  78         buffer[2] = reg & 0x7f;
  79         index_xfer.tx_buf = buffer;
  80         spi_message_add_tail(&index_xfer, &msg);
  81
  82         /* register value */
  83         buffer[4] = 0x72;
  84         buffer[5] = val >> 8;
  85         buffer[6] = val;
  86         value_xfer.tx_buf = buffer + 4;
  87         spi_message_add_tail(&value_xfer, &msg);
  88
  89         return spi_sync(spi, &msg);
  90 }
  91
  92 static void init_lb035q02_panel(struct spi_device *spi)
  93 {
  94         /* Init sequence from page 28 of the lb035q02 spec */
  95         lb035q02_write_reg(spi, 0x01, 0x6300);
  96         lb035q02_write_reg(spi, 0x02, 0x0200);
  97         lb035q02_write_reg(spi, 0x03, 0x0177);
  98         lb035q02_write_reg(spi, 0x04, 0x04c7);
  99         lb035q02_write_reg(spi, 0x05, 0xffc0);
 100         lb035q02_write_reg(spi, 0x06, 0xe806);
 101         lb035q02_write_reg(spi, 0x0a, 0x4008);
 102         lb035q02_write_reg(spi, 0x0b, 0x0000);
 103         lb035q02_write_reg(spi, 0x0d, 0x0030);
 104         lb035q02_write_reg(spi, 0x0e, 0x2800);
 105         lb035q02_write_reg(spi, 0x0f, 0x0000);
 106         lb035q02_write_reg(spi, 0x16, 0x9f80);
 107         lb035q02_write_reg(spi, 0x17, 0x0a0f);
 108         lb035q02_write_reg(spi, 0x1e, 0x00c1);
 109         lb035q02_write_reg(spi, 0x30, 0x0300);
 110         lb035q02_write_reg(spi, 0x31, 0x0007);
 111         lb035q02_write_reg(spi, 0x32, 0x0000);
 112         lb035q02_write_reg(spi, 0x33, 0x0000);
 113         lb035q02_write_reg(spi, 0x34, 0x0707);
 114         lb035q02_write_reg(spi, 0x35, 0x0004);
 115         lb035q02_write_reg(spi, 0x36, 0x0302);
 116         lb035q02_write_reg(spi, 0x37, 0x0202);
 117         lb035q02_write_reg(spi, 0x3a, 0x0a0d);
 118         lb035q02_write_reg(spi, 0x3b, 0x0806);
 119 }
 120
 121 static int lb035q02_connect(struct omap_dss_device *dssdev)
 122 {
 123         struct panel_drv_data *ddata = to_panel_data(dssdev);
 124         struct omap_dss_device *in = ddata->in;
 125         int r;
 126
 127         if (omapdss_device_is_connected(dssdev))
 128                 return 0;
 129
 130         r = in->ops.dpi->connect(in, dssdev);
 131         if (r)
 132                 return r;
 133
 134         init_lb035q02_panel(ddata->spi);
 135
 136         return 0;
 137 }
 138
 139 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
 140 {
 141         struct panel_drv_data *ddata = to_panel_data(dssdev);
 142         struct omap_dss_device *in = ddata->in;
 143
 144         if (!omapdss_device_is_connected(dssdev))
 145                 return;
 146
 147         in->ops.dpi->disconnect(in, dssdev);
 148 }
 149
 150 static int lb035q02_enable(struct omap_dss_device *dssdev)
 151 {
 152         struct panel_drv_data *ddata = to_panel_data(dssdev);
 153         struct omap_dss_device *in = ddata->in;
 154         int r;
 155
 156         if (!omapdss_device_is_connected(dssdev))
 157                 return -ENODEV;
 158
 159         if (omapdss_device_is_enabled(dssdev))
 160                 return 0;
 161
 162         if (ddata->data_lines)
 163                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
 164         in->ops.dpi->set_timings(in, &ddata->videomode);
 165
 166         r = in->ops.dpi->enable(in);
 167         if (r)
 168                 return r;
 169
 170         if (ddata->enable_gpio)
 171                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 172
 173         if (gpio_is_valid(ddata->backlight_gpio))
 174                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
 175
 176         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 177
 178         return 0;
 179 }
 180
 181 static void lb035q02_disable(struct omap_dss_device *dssdev)
 182 {
 183         struct panel_drv_data *ddata = to_panel_data(dssdev);
 184         struct omap_dss_device *in = ddata->in;
 185
 186         if (!omapdss_device_is_enabled(dssdev))
 187                 return;
 188
 189         if (ddata->enable_gpio)
 190                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 191
 192         if (gpio_is_valid(ddata->backlight_gpio))
 193                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 194
 195         in->ops.dpi->disable(in);
 196
 197         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 198 }
 199
 200 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
 201                 struct omap_video_timings *timings)
 202 {
 203         struct panel_drv_data *ddata = to_panel_data(dssdev);
 204         struct omap_dss_device *in = ddata->in;
 205
 206         ddata->videomode = *timings;
 207         dssdev->panel.timings = *timings;
 208
 209         in->ops.dpi->set_timings(in, timings);
 210 }
 211
 212 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
 213                 struct omap_video_timings *timings)
 214 {
 215         struct panel_drv_data *ddata = to_panel_data(dssdev);
 216
 217         *timings = ddata->videomode;
 218 }
 219
 220 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
 221                 struct omap_video_timings *timings)
 222 {
 223         struct panel_drv_data *ddata = to_panel_data(dssdev);
 224         struct omap_dss_device *in = ddata->in;
 225
 226         return in->ops.dpi->check_timings(in, timings);
 227 }
 228
 229 static struct omap_dss_driver lb035q02_ops = {
 230         .connect        = lb035q02_connect,
 231         .disconnect     = lb035q02_disconnect,
 232
 233         .enable         = lb035q02_enable,
 234         .disable        = lb035q02_disable,
 235
 236         .set_timings    = lb035q02_set_timings,
 237         .get_timings    = lb035q02_get_timings,
 238         .check_timings  = lb035q02_check_timings,
 239
 240         .get_resolution = omapdss_default_get_resolution,
 241 };
 242
 243 static int lb035q02_probe_pdata(struct spi_device *spi)
 244 {
 245         const struct panel_lb035q02_platform_data *pdata;
 246         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 247         struct omap_dss_device *dssdev, *in;
 248         int r;
 249
 250         pdata = dev_get_platdata(&spi->dev);
 251
 252         in = omap_dss_find_output(pdata->source);
 253         if (in == NULL) {
 254                 dev_err(&spi->dev, "failed to find video source '%s'\n",
 255                                 pdata->source);
 256                 return -EPROBE_DEFER;
 257         }
 258
 259         ddata->in = in;
 260
 261         ddata->data_lines = pdata->data_lines;
 262
 263         dssdev = &ddata->dssdev;
 264         dssdev->name = pdata->name;
 265
 266         r = devm_gpio_request_one(&spi->dev, pdata->enable_gpio,
 267                                         GPIOF_OUT_INIT_LOW, "panel enable");
 268         if (r)
 269                 goto err_gpio;
 270
 271         ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
 272
 273         ddata->backlight_gpio = pdata->backlight_gpio;
 274
 275         return 0;
 276 err_gpio:
 277         omap_dss_put_device(ddata->in);
 278         return r;
 279 }
 280
 281 static int lb035q02_probe_of(struct spi_device *spi)
 282 {
 283         struct device_node *node = spi->dev.of_node;
 284         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 285         struct omap_dss_device *in;
 286         struct gpio_desc *gpio;
 287
 288         gpio = devm_gpiod_get(&spi->dev, "enable");
 289         if (IS_ERR(gpio)) {
 290                 dev_err(&spi->dev, "failed to parse enable gpio\n");
 291                 return PTR_ERR(gpio);
 292         } else {
 293                 gpiod_direction_output(gpio, 0);
 294                 ddata->enable_gpio = gpio;
 295         }
 296
 297         ddata->backlight_gpio = -ENOENT;
 298
 299         in = omapdss_of_find_source_for_first_ep(node);
 300         if (IS_ERR(in)) {
 301                 dev_err(&spi->dev, "failed to find video source\n");
 302                 return PTR_ERR(in);
 303         }
 304
 305         ddata->in = in;
 306
 307         return 0;
 308 }
 309
 310 static int lb035q02_panel_spi_probe(struct spi_device *spi)
 311 {
 312         struct panel_drv_data *ddata;
 313         struct omap_dss_device *dssdev;
 314         int r;
 315
 316         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 317         if (ddata == NULL)
 318                 return -ENOMEM;
 319
 320         dev_set_drvdata(&spi->dev, ddata);
 321
 322         ddata->spi = spi;
 323
 324         if (dev_get_platdata(&spi->dev)) {
 325                 r = lb035q02_probe_pdata(spi);
 326                 if (r)
 327                         return r;
 328         } else if (spi->dev.of_node) {
 329                 r = lb035q02_probe_of(spi);
 330                 if (r)
 331                         return r;
 332         } else {
 333                 return -ENODEV;
 334         }
 335
 336         if (gpio_is_valid(ddata->backlight_gpio)) {
 337                 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
 338                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 339                 if (r)
 340                         goto err_gpio;
 341         }
 342
 343         ddata->videomode = lb035q02_timings;
 344
 345         dssdev = &ddata->dssdev;
 346         dssdev->dev = &spi->dev;
 347         dssdev->driver = &lb035q02_ops;
 348         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 349         dssdev->owner = THIS_MODULE;
 350         dssdev->panel.timings = ddata->videomode;
 351         dssdev->phy.dpi.data_lines = ddata->data_lines;
 352
 353         r = omapdss_register_display(dssdev);
 354         if (r) {
 355                 dev_err(&spi->dev, "Failed to register panel\n");
 356                 goto err_reg;
 357         }
 358
 359         return 0;
 360
 361 err_reg:
 362 err_gpio:
 363         omap_dss_put_device(ddata->in);
 364         return r;
 365 }
 366
 367 static int lb035q02_panel_spi_remove(struct spi_device *spi)
 368 {
 369         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 370         struct omap_dss_device *dssdev = &ddata->dssdev;
 371         struct omap_dss_device *in = ddata->in;
 372
 373         omapdss_unregister_display(dssdev);
 374
 375         lb035q02_disable(dssdev);
 376         lb035q02_disconnect(dssdev);
 377
 378         omap_dss_put_device(in);
 379
 380         return 0;
 381 }
 382
 383 static const struct of_device_id lb035q02_of_match[] = {
 384         { .compatible = "omapdss,lgphilips,lb035q02", },
 385         {},
 386 };
 387
 388 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
 389
 390 static struct spi_driver lb035q02_spi_driver = {
 391         .probe          = lb035q02_panel_spi_probe,
 392         .remove         = lb035q02_panel_spi_remove,
 393         .driver         = {
 394                 .name   = "panel_lgphilips_lb035q02",
 395                 .owner  = THIS_MODULE,
 396                 .of_match_table = lb035q02_of_match,
 397                 .suppress_bind_attrs = true,
 398         },
 399 };
 400
 401 module_spi_driver(lb035q02_spi_driver);
 402
 403 MODULE_ALIAS("spi:lgphilips,lb035q02");
 404 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 405 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
 406 MODULE_LICENSE("GPL");