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

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DEFINITIONS

This source file includes following definitions.
  1. lb035q02_write_reg
  2. init_lb035q02_panel
  3. lb035q02_connect
  4. lb035q02_disconnect
  5. lb035q02_enable
  6. lb035q02_disable
  7. lb035q02_set_timings
  8. lb035q02_get_timings
  9. lb035q02_check_timings
  10. lb035q02_probe_of
  11. lb035q02_panel_spi_probe
  12. lb035q02_panel_spi_remove

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LG.Philips LB035Q02 LCD Panel driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments
   6  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   7  * Based on a driver by: Steve Sakoman <steve@sakoman.com>
   8  */
   9 
  10 #include <linux/module.h>
  11 #include <linux/delay.h>
  12 #include <linux/spi/spi.h>
  13 #include <linux/mutex.h>
  14 #include <linux/gpio.h>
  15 
  16 #include <video/omapfb_dss.h>
  17 
  18 static const struct omap_video_timings lb035q02_timings = {
  19         .x_res = 320,
  20         .y_res = 240,
  21 
  22         .pixelclock     = 6500000,
  23 
  24         .hsw            = 2,
  25         .hfp            = 20,
  26         .hbp            = 68,
  27 
  28         .vsw            = 2,
  29         .vfp            = 4,
  30         .vbp            = 18,
  31 
  32         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  33         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  34         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  35         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  36         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
  37 };
  38 
  39 struct panel_drv_data {
  40         struct omap_dss_device dssdev;
  41         struct omap_dss_device *in;
  42 
  43         struct spi_device *spi;
  44 
  45         int data_lines;
  46 
  47         struct omap_video_timings videomode;
  48 
  49         /* used for non-DT boot, to be removed */
  50         int backlight_gpio;
  51 
  52         struct gpio_desc *enable_gpio;
  53 };
  54 
  55 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  56 
  57 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
  58 {
  59         struct spi_message msg;
  60         struct spi_transfer index_xfer = {
  61                 .len            = 3,
  62                 .cs_change      = 1,
  63         };
  64         struct spi_transfer value_xfer = {
  65                 .len            = 3,
  66         };
  67         u8      buffer[16];
  68 
  69         spi_message_init(&msg);
  70 
  71         /* register index */
  72         buffer[0] = 0x70;
  73         buffer[1] = 0x00;
  74         buffer[2] = reg & 0x7f;
  75         index_xfer.tx_buf = buffer;
  76         spi_message_add_tail(&index_xfer, &msg);
  77 
  78         /* register value */
  79         buffer[4] = 0x72;
  80         buffer[5] = val >> 8;
  81         buffer[6] = val;
  82         value_xfer.tx_buf = buffer + 4;
  83         spi_message_add_tail(&value_xfer, &msg);
  84 
  85         return spi_sync(spi, &msg);
  86 }
  87 
  88 static void init_lb035q02_panel(struct spi_device *spi)
  89 {
  90         /* Init sequence from page 28 of the lb035q02 spec */
  91         lb035q02_write_reg(spi, 0x01, 0x6300);
  92         lb035q02_write_reg(spi, 0x02, 0x0200);
  93         lb035q02_write_reg(spi, 0x03, 0x0177);
  94         lb035q02_write_reg(spi, 0x04, 0x04c7);
  95         lb035q02_write_reg(spi, 0x05, 0xffc0);
  96         lb035q02_write_reg(spi, 0x06, 0xe806);
  97         lb035q02_write_reg(spi, 0x0a, 0x4008);
  98         lb035q02_write_reg(spi, 0x0b, 0x0000);
  99         lb035q02_write_reg(spi, 0x0d, 0x0030);
 100         lb035q02_write_reg(spi, 0x0e, 0x2800);
 101         lb035q02_write_reg(spi, 0x0f, 0x0000);
 102         lb035q02_write_reg(spi, 0x16, 0x9f80);
 103         lb035q02_write_reg(spi, 0x17, 0x0a0f);
 104         lb035q02_write_reg(spi, 0x1e, 0x00c1);
 105         lb035q02_write_reg(spi, 0x30, 0x0300);
 106         lb035q02_write_reg(spi, 0x31, 0x0007);
 107         lb035q02_write_reg(spi, 0x32, 0x0000);
 108         lb035q02_write_reg(spi, 0x33, 0x0000);
 109         lb035q02_write_reg(spi, 0x34, 0x0707);
 110         lb035q02_write_reg(spi, 0x35, 0x0004);
 111         lb035q02_write_reg(spi, 0x36, 0x0302);
 112         lb035q02_write_reg(spi, 0x37, 0x0202);
 113         lb035q02_write_reg(spi, 0x3a, 0x0a0d);
 114         lb035q02_write_reg(spi, 0x3b, 0x0806);
 115 }
 116 
 117 static int lb035q02_connect(struct omap_dss_device *dssdev)
 118 {
 119         struct panel_drv_data *ddata = to_panel_data(dssdev);
 120         struct omap_dss_device *in = ddata->in;
 121         int r;
 122 
 123         if (omapdss_device_is_connected(dssdev))
 124                 return 0;
 125 
 126         r = in->ops.dpi->connect(in, dssdev);
 127         if (r)
 128                 return r;
 129 
 130         init_lb035q02_panel(ddata->spi);
 131 
 132         return 0;
 133 }
 134 
 135 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
 136 {
 137         struct panel_drv_data *ddata = to_panel_data(dssdev);
 138         struct omap_dss_device *in = ddata->in;
 139 
 140         if (!omapdss_device_is_connected(dssdev))
 141                 return;
 142 
 143         in->ops.dpi->disconnect(in, dssdev);
 144 }
 145 
 146 static int lb035q02_enable(struct omap_dss_device *dssdev)
 147 {
 148         struct panel_drv_data *ddata = to_panel_data(dssdev);
 149         struct omap_dss_device *in = ddata->in;
 150         int r;
 151 
 152         if (!omapdss_device_is_connected(dssdev))
 153                 return -ENODEV;
 154 
 155         if (omapdss_device_is_enabled(dssdev))
 156                 return 0;
 157 
 158         if (ddata->data_lines)
 159                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
 160         in->ops.dpi->set_timings(in, &ddata->videomode);
 161 
 162         r = in->ops.dpi->enable(in);
 163         if (r)
 164                 return r;
 165 
 166         if (ddata->enable_gpio)
 167                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 168 
 169         if (gpio_is_valid(ddata->backlight_gpio))
 170                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
 171 
 172         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 173 
 174         return 0;
 175 }
 176 
 177 static void lb035q02_disable(struct omap_dss_device *dssdev)
 178 {
 179         struct panel_drv_data *ddata = to_panel_data(dssdev);
 180         struct omap_dss_device *in = ddata->in;
 181 
 182         if (!omapdss_device_is_enabled(dssdev))
 183                 return;
 184 
 185         if (ddata->enable_gpio)
 186                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 187 
 188         if (gpio_is_valid(ddata->backlight_gpio))
 189                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 190 
 191         in->ops.dpi->disable(in);
 192 
 193         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 194 }
 195 
 196 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
 197                 struct omap_video_timings *timings)
 198 {
 199         struct panel_drv_data *ddata = to_panel_data(dssdev);
 200         struct omap_dss_device *in = ddata->in;
 201 
 202         ddata->videomode = *timings;
 203         dssdev->panel.timings = *timings;
 204 
 205         in->ops.dpi->set_timings(in, timings);
 206 }
 207 
 208 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
 209                 struct omap_video_timings *timings)
 210 {
 211         struct panel_drv_data *ddata = to_panel_data(dssdev);
 212 
 213         *timings = ddata->videomode;
 214 }
 215 
 216 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
 217                 struct omap_video_timings *timings)
 218 {
 219         struct panel_drv_data *ddata = to_panel_data(dssdev);
 220         struct omap_dss_device *in = ddata->in;
 221 
 222         return in->ops.dpi->check_timings(in, timings);
 223 }
 224 
 225 static struct omap_dss_driver lb035q02_ops = {
 226         .connect        = lb035q02_connect,
 227         .disconnect     = lb035q02_disconnect,
 228 
 229         .enable         = lb035q02_enable,
 230         .disable        = lb035q02_disable,
 231 
 232         .set_timings    = lb035q02_set_timings,
 233         .get_timings    = lb035q02_get_timings,
 234         .check_timings  = lb035q02_check_timings,
 235 
 236         .get_resolution = omapdss_default_get_resolution,
 237 };
 238 
 239 static int lb035q02_probe_of(struct spi_device *spi)
 240 {
 241         struct device_node *node = spi->dev.of_node;
 242         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 243         struct omap_dss_device *in;
 244         struct gpio_desc *gpio;
 245 
 246         gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
 247         if (IS_ERR(gpio)) {
 248                 dev_err(&spi->dev, "failed to parse enable gpio\n");
 249                 return PTR_ERR(gpio);
 250         }
 251 
 252         ddata->enable_gpio = gpio;
 253 
 254         ddata->backlight_gpio = -ENOENT;
 255 
 256         in = omapdss_of_find_source_for_first_ep(node);
 257         if (IS_ERR(in)) {
 258                 dev_err(&spi->dev, "failed to find video source\n");
 259                 return PTR_ERR(in);
 260         }
 261 
 262         ddata->in = in;
 263 
 264         return 0;
 265 }
 266 
 267 static int lb035q02_panel_spi_probe(struct spi_device *spi)
 268 {
 269         struct panel_drv_data *ddata;
 270         struct omap_dss_device *dssdev;
 271         int r;
 272 
 273         if (!spi->dev.of_node)
 274                 return -ENODEV;
 275 
 276         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 277         if (ddata == NULL)
 278                 return -ENOMEM;
 279 
 280         dev_set_drvdata(&spi->dev, ddata);
 281 
 282         ddata->spi = spi;
 283 
 284         r = lb035q02_probe_of(spi);
 285         if (r)
 286                 return r;
 287 
 288         if (gpio_is_valid(ddata->backlight_gpio)) {
 289                 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
 290                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 291                 if (r)
 292                         goto err_gpio;
 293         }
 294 
 295         ddata->videomode = lb035q02_timings;
 296 
 297         dssdev = &ddata->dssdev;
 298         dssdev->dev = &spi->dev;
 299         dssdev->driver = &lb035q02_ops;
 300         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 301         dssdev->owner = THIS_MODULE;
 302         dssdev->panel.timings = ddata->videomode;
 303         dssdev->phy.dpi.data_lines = ddata->data_lines;
 304 
 305         r = omapdss_register_display(dssdev);
 306         if (r) {
 307                 dev_err(&spi->dev, "Failed to register panel\n");
 308                 goto err_reg;
 309         }
 310 
 311         return 0;
 312 
 313 err_reg:
 314 err_gpio:
 315         omap_dss_put_device(ddata->in);
 316         return r;
 317 }
 318 
 319 static int lb035q02_panel_spi_remove(struct spi_device *spi)
 320 {
 321         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 322         struct omap_dss_device *dssdev = &ddata->dssdev;
 323         struct omap_dss_device *in = ddata->in;
 324 
 325         omapdss_unregister_display(dssdev);
 326 
 327         lb035q02_disable(dssdev);
 328         lb035q02_disconnect(dssdev);
 329 
 330         omap_dss_put_device(in);
 331 
 332         return 0;
 333 }
 334 
 335 static const struct of_device_id lb035q02_of_match[] = {
 336         { .compatible = "omapdss,lgphilips,lb035q02", },
 337         {},
 338 };
 339 
 340 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
 341 
 342 static struct spi_driver lb035q02_spi_driver = {
 343         .probe          = lb035q02_panel_spi_probe,
 344         .remove         = lb035q02_panel_spi_remove,
 345         .driver         = {
 346                 .name   = "panel_lgphilips_lb035q02",
 347                 .of_match_table = lb035q02_of_match,
 348                 .suppress_bind_attrs = true,
 349         },
 350 };
 351 
 352 module_spi_driver(lb035q02_spi_driver);
 353 
 354 MODULE_ALIAS("spi:lgphilips,lb035q02");
 355 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 356 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
 357 MODULE_LICENSE("GPL");

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