drivers/gpu/drm/omapdrm/displays/panel-lgphilips-lb035q02.c

   1 /*
   2  * LG.Philips LB035Q02 LCD Panel driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   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 const struct videomode lb035q02_vm = {
  23         .hactive = 320,
  24         .vactive = 240,
  25
  26         .pixelclock     = 6500000,
  27
  28         .hsync_len      = 2,
  29         .hfront_porch   = 20,
  30         .hback_porch    = 68,
  31
  32         .vsync_len      = 2,
  33         .vfront_porch   = 4,
  34         .vback_porch    = 18,
  35
  36         .flags          = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
  37                           DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_SYNC_NEGEDGE |
  38                           DISPLAY_FLAGS_PIXDATA_POSEDGE,
  39         /*
  40          * Note: According to the panel documentation:
  41          * DE is active LOW
  42          * DATA needs to be driven on the FALLING edge
  43          */
  44 };
  45
  46 struct panel_drv_data {
  47         struct omap_dss_device dssdev;
  48         struct omap_dss_device *in;
  49
  50         struct spi_device *spi;
  51
  52         struct videomode vm;
  53
  54         struct gpio_desc *enable_gpio;
  55 };
  56
  57 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  58
  59 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
  60 {
  61         struct spi_message msg;
  62         struct spi_transfer index_xfer = {
  63                 .len            = 3,
  64                 .cs_change      = 1,
  65         };
  66         struct spi_transfer value_xfer = {
  67                 .len            = 3,
  68         };
  69         u8      buffer[16];
  70
  71         spi_message_init(&msg);
  72
  73         /* register index */
  74         buffer[0] = 0x70;
  75         buffer[1] = 0x00;
  76         buffer[2] = reg & 0x7f;
  77         index_xfer.tx_buf = buffer;
  78         spi_message_add_tail(&index_xfer, &msg);
  79
  80         /* register value */
  81         buffer[4] = 0x72;
  82         buffer[5] = val >> 8;
  83         buffer[6] = val;
  84         value_xfer.tx_buf = buffer + 4;
  85         spi_message_add_tail(&value_xfer, &msg);
  86
  87         return spi_sync(spi, &msg);
  88 }
  89
  90 static void init_lb035q02_panel(struct spi_device *spi)
  91 {
  92         /* Init sequence from page 28 of the lb035q02 spec */
  93         lb035q02_write_reg(spi, 0x01, 0x6300);
  94         lb035q02_write_reg(spi, 0x02, 0x0200);
  95         lb035q02_write_reg(spi, 0x03, 0x0177);
  96         lb035q02_write_reg(spi, 0x04, 0x04c7);
  97         lb035q02_write_reg(spi, 0x05, 0xffc0);
  98         lb035q02_write_reg(spi, 0x06, 0xe806);
  99         lb035q02_write_reg(spi, 0x0a, 0x4008);
 100         lb035q02_write_reg(spi, 0x0b, 0x0000);
 101         lb035q02_write_reg(spi, 0x0d, 0x0030);
 102         lb035q02_write_reg(spi, 0x0e, 0x2800);
 103         lb035q02_write_reg(spi, 0x0f, 0x0000);
 104         lb035q02_write_reg(spi, 0x16, 0x9f80);
 105         lb035q02_write_reg(spi, 0x17, 0x0a0f);
 106         lb035q02_write_reg(spi, 0x1e, 0x00c1);
 107         lb035q02_write_reg(spi, 0x30, 0x0300);
 108         lb035q02_write_reg(spi, 0x31, 0x0007);
 109         lb035q02_write_reg(spi, 0x32, 0x0000);
 110         lb035q02_write_reg(spi, 0x33, 0x0000);
 111         lb035q02_write_reg(spi, 0x34, 0x0707);
 112         lb035q02_write_reg(spi, 0x35, 0x0004);
 113         lb035q02_write_reg(spi, 0x36, 0x0302);
 114         lb035q02_write_reg(spi, 0x37, 0x0202);
 115         lb035q02_write_reg(spi, 0x3a, 0x0a0d);
 116         lb035q02_write_reg(spi, 0x3b, 0x0806);
 117 }
 118
 119 static int lb035q02_connect(struct omap_dss_device *dssdev)
 120 {
 121         struct panel_drv_data *ddata = to_panel_data(dssdev);
 122         struct omap_dss_device *in = ddata->in;
 123         int r;
 124
 125         if (omapdss_device_is_connected(dssdev))
 126                 return 0;
 127
 128         r = in->ops.dpi->connect(in, dssdev);
 129         if (r)
 130                 return r;
 131
 132         init_lb035q02_panel(ddata->spi);
 133
 134         return 0;
 135 }
 136
 137 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
 138 {
 139         struct panel_drv_data *ddata = to_panel_data(dssdev);
 140         struct omap_dss_device *in = ddata->in;
 141
 142         if (!omapdss_device_is_connected(dssdev))
 143                 return;
 144
 145         in->ops.dpi->disconnect(in, dssdev);
 146 }
 147
 148 static int lb035q02_enable(struct omap_dss_device *dssdev)
 149 {
 150         struct panel_drv_data *ddata = to_panel_data(dssdev);
 151         struct omap_dss_device *in = ddata->in;
 152         int r;
 153
 154         if (!omapdss_device_is_connected(dssdev))
 155                 return -ENODEV;
 156
 157         if (omapdss_device_is_enabled(dssdev))
 158                 return 0;
 159
 160         in->ops.dpi->set_timings(in, &ddata->vm);
 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         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 170
 171         return 0;
 172 }
 173
 174 static void lb035q02_disable(struct omap_dss_device *dssdev)
 175 {
 176         struct panel_drv_data *ddata = to_panel_data(dssdev);
 177         struct omap_dss_device *in = ddata->in;
 178
 179         if (!omapdss_device_is_enabled(dssdev))
 180                 return;
 181
 182         if (ddata->enable_gpio)
 183                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 184
 185         in->ops.dpi->disable(in);
 186
 187         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 188 }
 189
 190 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
 191                                  struct videomode *vm)
 192 {
 193         struct panel_drv_data *ddata = to_panel_data(dssdev);
 194         struct omap_dss_device *in = ddata->in;
 195
 196         ddata->vm = *vm;
 197         dssdev->panel.vm = *vm;
 198
 199         in->ops.dpi->set_timings(in, vm);
 200 }
 201
 202 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
 203                                  struct videomode *vm)
 204 {
 205         struct panel_drv_data *ddata = to_panel_data(dssdev);
 206
 207         *vm = ddata->vm;
 208 }
 209
 210 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
 211                                   struct videomode *vm)
 212 {
 213         struct panel_drv_data *ddata = to_panel_data(dssdev);
 214         struct omap_dss_device *in = ddata->in;
 215
 216         return in->ops.dpi->check_timings(in, vm);
 217 }
 218
 219 static struct omap_dss_driver lb035q02_ops = {
 220         .connect        = lb035q02_connect,
 221         .disconnect     = lb035q02_disconnect,
 222
 223         .enable         = lb035q02_enable,
 224         .disable        = lb035q02_disable,
 225
 226         .set_timings    = lb035q02_set_timings,
 227         .get_timings    = lb035q02_get_timings,
 228         .check_timings  = lb035q02_check_timings,
 229 };
 230
 231 static int lb035q02_probe_of(struct spi_device *spi)
 232 {
 233         struct device_node *node = spi->dev.of_node;
 234         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 235         struct omap_dss_device *in;
 236         struct gpio_desc *gpio;
 237
 238         gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
 239         if (IS_ERR(gpio)) {
 240                 dev_err(&spi->dev, "failed to parse enable gpio\n");
 241                 return PTR_ERR(gpio);
 242         }
 243
 244         ddata->enable_gpio = gpio;
 245
 246         in = omapdss_of_find_source_for_first_ep(node);
 247         if (IS_ERR(in)) {
 248                 dev_err(&spi->dev, "failed to find video source\n");
 249                 return PTR_ERR(in);
 250         }
 251
 252         ddata->in = in;
 253
 254         return 0;
 255 }
 256
 257 static int lb035q02_panel_spi_probe(struct spi_device *spi)
 258 {
 259         struct panel_drv_data *ddata;
 260         struct omap_dss_device *dssdev;
 261         int r;
 262
 263         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 264         if (ddata == NULL)
 265                 return -ENOMEM;
 266
 267         dev_set_drvdata(&spi->dev, ddata);
 268
 269         ddata->spi = spi;
 270
 271         if (!spi->dev.of_node)
 272                 return -ENODEV;
 273
 274         r = lb035q02_probe_of(spi);
 275         if (r)
 276                 return r;
 277
 278         ddata->vm = lb035q02_vm;
 279
 280         dssdev = &ddata->dssdev;
 281         dssdev->dev = &spi->dev;
 282         dssdev->driver = &lb035q02_ops;
 283         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 284         dssdev->owner = THIS_MODULE;
 285         dssdev->panel.vm = ddata->vm;
 286
 287         r = omapdss_register_display(dssdev);
 288         if (r) {
 289                 dev_err(&spi->dev, "Failed to register panel\n");
 290                 goto err_reg;
 291         }
 292
 293         return 0;
 294
 295 err_reg:
 296         omap_dss_put_device(ddata->in);
 297         return r;
 298 }
 299
 300 static int lb035q02_panel_spi_remove(struct spi_device *spi)
 301 {
 302         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 303         struct omap_dss_device *dssdev = &ddata->dssdev;
 304         struct omap_dss_device *in = ddata->in;
 305
 306         omapdss_unregister_display(dssdev);
 307
 308         lb035q02_disable(dssdev);
 309         lb035q02_disconnect(dssdev);
 310
 311         omap_dss_put_device(in);
 312
 313         return 0;
 314 }
 315
 316 static const struct of_device_id lb035q02_of_match[] = {
 317         { .compatible = "omapdss,lgphilips,lb035q02", },
 318         {},
 319 };
 320
 321 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
 322
 323 static struct spi_driver lb035q02_spi_driver = {
 324         .probe          = lb035q02_panel_spi_probe,
 325         .remove         = lb035q02_panel_spi_remove,
 326         .driver         = {
 327                 .name   = "panel_lgphilips_lb035q02",
 328                 .of_match_table = lb035q02_of_match,
 329                 .suppress_bind_attrs = true,
 330         },
 331 };
 332
 333 module_spi_driver(lb035q02_spi_driver);
 334
 335 MODULE_ALIAS("spi:lgphilips,lb035q02");
 336 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 337 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
 338 MODULE_LICENSE("GPL");