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