drivers/video/fbdev/omap2/omapfb/displays/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/omapfb_dss.h>
  20
  21 static const struct omap_video_timings lb035q02_timings = {
  22         .x_res = 320,
  23         .y_res = 240,
  24
  25         .pixelclock     = 6500000,
  26
  27         .hsw            = 2,
  28         .hfp            = 20,
  29         .hbp            = 68,
  30
  31         .vsw            = 2,
  32         .vfp            = 4,
  33         .vbp            = 18,
  34
  35         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  36         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  37         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  38         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  39         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
  40 };
  41
  42 struct panel_drv_data {
  43         struct omap_dss_device dssdev;
  44         struct omap_dss_device *in;
  45
  46         struct spi_device *spi;
  47
  48         int data_lines;
  49
  50         struct omap_video_timings videomode;
  51
  52         /* used for non-DT boot, to be removed */
  53         int backlight_gpio;
  54
  55         struct gpio_desc *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         if (ddata->data_lines)
 162                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
 163         in->ops.dpi->set_timings(in, &ddata->videomode);
 164
 165         r = in->ops.dpi->enable(in);
 166         if (r)
 167                 return r;
 168
 169         if (ddata->enable_gpio)
 170                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 171
 172         if (gpio_is_valid(ddata->backlight_gpio))
 173                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
 174
 175         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 176
 177         return 0;
 178 }
 179
 180 static void lb035q02_disable(struct omap_dss_device *dssdev)
 181 {
 182         struct panel_drv_data *ddata = to_panel_data(dssdev);
 183         struct omap_dss_device *in = ddata->in;
 184
 185         if (!omapdss_device_is_enabled(dssdev))
 186                 return;
 187
 188         if (ddata->enable_gpio)
 189                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 190
 191         if (gpio_is_valid(ddata->backlight_gpio))
 192                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 193
 194         in->ops.dpi->disable(in);
 195
 196         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 197 }
 198
 199 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
 200                 struct omap_video_timings *timings)
 201 {
 202         struct panel_drv_data *ddata = to_panel_data(dssdev);
 203         struct omap_dss_device *in = ddata->in;
 204
 205         ddata->videomode = *timings;
 206         dssdev->panel.timings = *timings;
 207
 208         in->ops.dpi->set_timings(in, timings);
 209 }
 210
 211 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
 212                 struct omap_video_timings *timings)
 213 {
 214         struct panel_drv_data *ddata = to_panel_data(dssdev);
 215
 216         *timings = ddata->videomode;
 217 }
 218
 219 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
 220                 struct omap_video_timings *timings)
 221 {
 222         struct panel_drv_data *ddata = to_panel_data(dssdev);
 223         struct omap_dss_device *in = ddata->in;
 224
 225         return in->ops.dpi->check_timings(in, timings);
 226 }
 227
 228 static struct omap_dss_driver lb035q02_ops = {
 229         .connect        = lb035q02_connect,
 230         .disconnect     = lb035q02_disconnect,
 231
 232         .enable         = lb035q02_enable,
 233         .disable        = lb035q02_disable,
 234
 235         .set_timings    = lb035q02_set_timings,
 236         .get_timings    = lb035q02_get_timings,
 237         .check_timings  = lb035q02_check_timings,
 238
 239         .get_resolution = omapdss_default_get_resolution,
 240 };
 241
 242 static int lb035q02_probe_of(struct spi_device *spi)
 243 {
 244         struct device_node *node = spi->dev.of_node;
 245         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 246         struct omap_dss_device *in;
 247         struct gpio_desc *gpio;
 248
 249         gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
 250         if (IS_ERR(gpio)) {
 251                 dev_err(&spi->dev, "failed to parse enable gpio\n");
 252                 return PTR_ERR(gpio);
 253         }
 254
 255         ddata->enable_gpio = gpio;
 256
 257         ddata->backlight_gpio = -ENOENT;
 258
 259         in = omapdss_of_find_source_for_first_ep(node);
 260         if (IS_ERR(in)) {
 261                 dev_err(&spi->dev, "failed to find video source\n");
 262                 return PTR_ERR(in);
 263         }
 264
 265         ddata->in = in;
 266
 267         return 0;
 268 }
 269
 270 static int lb035q02_panel_spi_probe(struct spi_device *spi)
 271 {
 272         struct panel_drv_data *ddata;
 273         struct omap_dss_device *dssdev;
 274         int r;
 275
 276         if (!spi->dev.of_node)
 277                 return -ENODEV;
 278
 279         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 280         if (ddata == NULL)
 281                 return -ENOMEM;
 282
 283         dev_set_drvdata(&spi->dev, ddata);
 284
 285         ddata->spi = spi;
 286
 287         r = lb035q02_probe_of(spi);
 288         if (r)
 289                 return r;
 290
 291         if (gpio_is_valid(ddata->backlight_gpio)) {
 292                 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
 293                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 294                 if (r)
 295                         goto err_gpio;
 296         }
 297
 298         ddata->videomode = lb035q02_timings;
 299
 300         dssdev = &ddata->dssdev;
 301         dssdev->dev = &spi->dev;
 302         dssdev->driver = &lb035q02_ops;
 303         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 304         dssdev->owner = THIS_MODULE;
 305         dssdev->panel.timings = ddata->videomode;
 306         dssdev->phy.dpi.data_lines = ddata->data_lines;
 307
 308         r = omapdss_register_display(dssdev);
 309         if (r) {
 310                 dev_err(&spi->dev, "Failed to register panel\n");
 311                 goto err_reg;
 312         }
 313
 314         return 0;
 315
 316 err_reg:
 317 err_gpio:
 318         omap_dss_put_device(ddata->in);
 319         return r;
 320 }
 321
 322 static int lb035q02_panel_spi_remove(struct spi_device *spi)
 323 {
 324         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 325         struct omap_dss_device *dssdev = &ddata->dssdev;
 326         struct omap_dss_device *in = ddata->in;
 327
 328         omapdss_unregister_display(dssdev);
 329
 330         lb035q02_disable(dssdev);
 331         lb035q02_disconnect(dssdev);
 332
 333         omap_dss_put_device(in);
 334
 335         return 0;
 336 }
 337
 338 static const struct of_device_id lb035q02_of_match[] = {
 339         { .compatible = "omapdss,lgphilips,lb035q02", },
 340         {},
 341 };
 342
 343 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
 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                 .of_match_table = lb035q02_of_match,
 351                 .suppress_bind_attrs = true,
 352         },
 353 };
 354
 355 module_spi_driver(lb035q02_spi_driver);
 356
 357 MODULE_ALIAS("spi:lgphilips,lb035q02");
 358 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 359 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
 360 MODULE_LICENSE("GPL");