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         int reset_gpio;
  54         int backlight_gpio;
  55         int enable_gpio;
  56 };
  57
  58 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  59
  60 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
  61 {
  62         struct spi_message msg;
  63         struct spi_transfer index_xfer = {
  64                 .len            = 3,
  65                 .cs_change      = 1,
  66         };
  67         struct spi_transfer value_xfer = {
  68                 .len            = 3,
  69         };
  70         u8      buffer[16];
  71
  72         spi_message_init(&msg);
  73
  74         /* register index */
  75         buffer[0] = 0x70;
  76         buffer[1] = 0x00;
  77         buffer[2] = reg & 0x7f;
  78         index_xfer.tx_buf = buffer;
  79         spi_message_add_tail(&index_xfer, &msg);
  80
  81         /* register value */
  82         buffer[4] = 0x72;
  83         buffer[5] = val >> 8;
  84         buffer[6] = val;
  85         value_xfer.tx_buf = buffer + 4;
  86         spi_message_add_tail(&value_xfer, &msg);
  87
  88         return spi_sync(spi, &msg);
  89 }
  90
  91 static void init_lb035q02_panel(struct spi_device *spi)
  92 {
  93         /* Init sequence from page 28 of the lb035q02 spec */
  94         lb035q02_write_reg(spi, 0x01, 0x6300);
  95         lb035q02_write_reg(spi, 0x02, 0x0200);
  96         lb035q02_write_reg(spi, 0x03, 0x0177);
  97         lb035q02_write_reg(spi, 0x04, 0x04c7);
  98         lb035q02_write_reg(spi, 0x05, 0xffc0);
  99         lb035q02_write_reg(spi, 0x06, 0xe806);
 100         lb035q02_write_reg(spi, 0x0a, 0x4008);
 101         lb035q02_write_reg(spi, 0x0b, 0x0000);
 102         lb035q02_write_reg(spi, 0x0d, 0x0030);
 103         lb035q02_write_reg(spi, 0x0e, 0x2800);
 104         lb035q02_write_reg(spi, 0x0f, 0x0000);
 105         lb035q02_write_reg(spi, 0x16, 0x9f80);
 106         lb035q02_write_reg(spi, 0x17, 0x0a0f);
 107         lb035q02_write_reg(spi, 0x1e, 0x00c1);
 108         lb035q02_write_reg(spi, 0x30, 0x0300);
 109         lb035q02_write_reg(spi, 0x31, 0x0007);
 110         lb035q02_write_reg(spi, 0x32, 0x0000);
 111         lb035q02_write_reg(spi, 0x33, 0x0000);
 112         lb035q02_write_reg(spi, 0x34, 0x0707);
 113         lb035q02_write_reg(spi, 0x35, 0x0004);
 114         lb035q02_write_reg(spi, 0x36, 0x0302);
 115         lb035q02_write_reg(spi, 0x37, 0x0202);
 116         lb035q02_write_reg(spi, 0x3a, 0x0a0d);
 117         lb035q02_write_reg(spi, 0x3b, 0x0806);
 118 }
 119
 120 static int lb035q02_connect(struct omap_dss_device *dssdev)
 121 {
 122         struct panel_drv_data *ddata = to_panel_data(dssdev);
 123         struct omap_dss_device *in = ddata->in;
 124         int r;
 125
 126         if (omapdss_device_is_connected(dssdev))
 127                 return 0;
 128
 129         r = in->ops.dpi->connect(in, dssdev);
 130         if (r)
 131                 return r;
 132
 133         init_lb035q02_panel(ddata->spi);
 134
 135         return 0;
 136 }
 137
 138 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
 139 {
 140         struct panel_drv_data *ddata = to_panel_data(dssdev);
 141         struct omap_dss_device *in = ddata->in;
 142
 143         if (!omapdss_device_is_connected(dssdev))
 144                 return;
 145
 146         in->ops.dpi->disconnect(in, dssdev);
 147 }
 148
 149 static int lb035q02_enable(struct omap_dss_device *dssdev)
 150 {
 151         struct panel_drv_data *ddata = to_panel_data(dssdev);
 152         struct omap_dss_device *in = ddata->in;
 153         int r;
 154
 155         if (!omapdss_device_is_connected(dssdev))
 156                 return -ENODEV;
 157
 158         if (omapdss_device_is_enabled(dssdev))
 159                 return 0;
 160
 161         in->ops.dpi->set_data_lines(in, ddata->data_lines);
 162         in->ops.dpi->set_timings(in, &ddata->videomode);
 163
 164         r = in->ops.dpi->enable(in);
 165         if (r)
 166                 return r;
 167
 168         if (gpio_is_valid(ddata->enable_gpio))
 169                 gpio_set_value_cansleep(ddata->enable_gpio, 1);
 170
 171         if (gpio_is_valid(ddata->backlight_gpio))
 172                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
 173
 174         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 175
 176         return 0;
 177 }
 178
 179 static void lb035q02_disable(struct omap_dss_device *dssdev)
 180 {
 181         struct panel_drv_data *ddata = to_panel_data(dssdev);
 182         struct omap_dss_device *in = ddata->in;
 183
 184         if (!omapdss_device_is_enabled(dssdev))
 185                 return;
 186
 187         if (gpio_is_valid(ddata->enable_gpio))
 188                 gpio_set_value_cansleep(ddata->enable_gpio, 0);
 189
 190         if (gpio_is_valid(ddata->backlight_gpio))
 191                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 192
 193         in->ops.dpi->disable(in);
 194
 195         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 196 }
 197
 198 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
 199                 struct omap_video_timings *timings)
 200 {
 201         struct panel_drv_data *ddata = to_panel_data(dssdev);
 202         struct omap_dss_device *in = ddata->in;
 203
 204         ddata->videomode = *timings;
 205         dssdev->panel.timings = *timings;
 206
 207         in->ops.dpi->set_timings(in, timings);
 208 }
 209
 210 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
 211                 struct omap_video_timings *timings)
 212 {
 213         struct panel_drv_data *ddata = to_panel_data(dssdev);
 214
 215         *timings = ddata->videomode;
 216 }
 217
 218 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
 219                 struct omap_video_timings *timings)
 220 {
 221         struct panel_drv_data *ddata = to_panel_data(dssdev);
 222         struct omap_dss_device *in = ddata->in;
 223
 224         return in->ops.dpi->check_timings(in, timings);
 225 }
 226
 227 static struct omap_dss_driver lb035q02_ops = {
 228         .connect        = lb035q02_connect,
 229         .disconnect     = lb035q02_disconnect,
 230
 231         .enable         = lb035q02_enable,
 232         .disable        = lb035q02_disable,
 233
 234         .set_timings    = lb035q02_set_timings,
 235         .get_timings    = lb035q02_get_timings,
 236         .check_timings  = lb035q02_check_timings,
 237
 238         .get_resolution = omapdss_default_get_resolution,
 239 };
 240
 241 static int lb035q02_probe_pdata(struct spi_device *spi)
 242 {
 243         const struct panel_lb035q02_platform_data *pdata;
 244         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 245         struct omap_dss_device *dssdev, *in;
 246
 247         pdata = dev_get_platdata(&spi->dev);
 248
 249         in = omap_dss_find_output(pdata->source);
 250         if (in == NULL) {
 251                 dev_err(&spi->dev, "failed to find video source '%s'\n",
 252                                 pdata->source);
 253                 return -EPROBE_DEFER;
 254         }
 255
 256         ddata->in = in;
 257
 258         ddata->data_lines = pdata->data_lines;
 259
 260         dssdev = &ddata->dssdev;
 261         dssdev->name = pdata->name;
 262
 263         ddata->enable_gpio = pdata->enable_gpio;
 264         ddata->backlight_gpio = pdata->backlight_gpio;
 265
 266         return 0;
 267 }
 268
 269 static int lb035q02_panel_spi_probe(struct spi_device *spi)
 270 {
 271         struct panel_drv_data *ddata;
 272         struct omap_dss_device *dssdev;
 273         int r;
 274
 275         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 276         if (ddata == NULL)
 277                 return -ENOMEM;
 278
 279         dev_set_drvdata(&spi->dev, ddata);
 280
 281         ddata->spi = spi;
 282
 283         if (dev_get_platdata(&spi->dev)) {
 284                 r = lb035q02_probe_pdata(spi);
 285                 if (r)
 286                         return r;
 287         } else {
 288                 return -ENODEV;
 289         }
 290
 291         if (gpio_is_valid(ddata->enable_gpio)) {
 292                 r = devm_gpio_request_one(&spi->dev, ddata->enable_gpio,
 293                                 GPIOF_OUT_INIT_LOW, "panel enable");
 294                 if (r)
 295                         goto err_gpio;
 296         }
 297
 298         if (gpio_is_valid(ddata->backlight_gpio)) {
 299                 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
 300                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 301                 if (r)
 302                         goto err_gpio;
 303         }
 304
 305         ddata->videomode = lb035q02_timings;
 306
 307         dssdev = &ddata->dssdev;
 308         dssdev->dev = &spi->dev;
 309         dssdev->driver = &lb035q02_ops;
 310         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 311         dssdev->owner = THIS_MODULE;
 312         dssdev->panel.timings = ddata->videomode;
 313         dssdev->phy.dpi.data_lines = ddata->data_lines;
 314
 315         r = omapdss_register_display(dssdev);
 316         if (r) {
 317                 dev_err(&spi->dev, "Failed to register panel\n");
 318                 goto err_reg;
 319         }
 320
 321         return 0;
 322
 323 err_reg:
 324 err_gpio:
 325         omap_dss_put_device(ddata->in);
 326         return r;
 327 }
 328
 329 static int lb035q02_panel_spi_remove(struct spi_device *spi)
 330 {
 331         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 332         struct omap_dss_device *dssdev = &ddata->dssdev;
 333         struct omap_dss_device *in = ddata->in;
 334
 335         omapdss_unregister_display(dssdev);
 336
 337         lb035q02_disable(dssdev);
 338         lb035q02_disconnect(dssdev);
 339
 340         omap_dss_put_device(in);
 341
 342         return 0;
 343 }
 344
 345 static struct spi_driver lb035q02_spi_driver = {
 346         .probe          = lb035q02_panel_spi_probe,
 347         .remove         = lb035q02_panel_spi_remove,
 348         .driver         = {
 349                 .name   = "panel_lgphilips_lb035q02",
 350                 .owner  = THIS_MODULE,
 351         },
 352 };
 353
 354 module_spi_driver(lb035q02_spi_driver);
 355
 356 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 357 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
 358 MODULE_LICENSE("GPL");