drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/device.h>
   4 #include <linux/module.h>
   5 #include <linux/spi/spi.h>
   6 #include <linux/delay.h>
   7
   8 #include <drm/drm_mipi_dbi.h>
   9 #include <drm/drm_print.h>
  10
  11 #include "panel-samsung-s6e63m0.h"
  12
  13 static const u8 s6e63m0_dbi_read_commands[] = {
  14         MCS_READ_ID1,
  15         MCS_READ_ID2,
  16         MCS_READ_ID3,
  17         0, /* sentinel */
  18 };
  19
  20 static int s6e63m0_spi_dcs_read(struct device *dev, void *trsp,
  21                                 const u8 cmd, u8 *data)
  22 {
  23         struct mipi_dbi *dbi = trsp;
  24         int ret;
  25
  26         ret = mipi_dbi_command_read(dbi, cmd, data);
  27         if (ret)
  28                 dev_err(dev, "error on DBI read command %02x\n", cmd);
  29
  30         return ret;
  31 }
  32
  33 static int s6e63m0_spi_dcs_write(struct device *dev, void *trsp,
  34                                  const u8 *data, size_t len)
  35 {
  36         struct mipi_dbi *dbi = trsp;
  37         int ret;
  38
  39         ret = mipi_dbi_command_stackbuf(dbi, data[0], (data + 1), (len - 1));
  40         usleep_range(300, 310);
  41
  42         return ret;
  43 }
  44
  45 static int s6e63m0_spi_probe(struct spi_device *spi)
  46 {
  47         struct device *dev = &spi->dev;
  48         struct mipi_dbi *dbi;
  49         int ret;
  50
  51         dbi = devm_kzalloc(dev, sizeof(*dbi), GFP_KERNEL);
  52         if (!dbi)
  53                 return -ENOMEM;
  54
  55         ret = mipi_dbi_spi_init(spi, dbi, NULL);
  56         if (ret)
  57                 return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
  58         /* Register our custom MCS read commands */
  59         dbi->read_commands = s6e63m0_dbi_read_commands;
  60
  61         return s6e63m0_probe(dev, dbi, s6e63m0_spi_dcs_read,
  62                              s6e63m0_spi_dcs_write, false);
  63 }
  64
  65 static void s6e63m0_spi_remove(struct spi_device *spi)
  66 {
  67         s6e63m0_remove(&spi->dev);
  68 }
  69
  70 static const struct of_device_id s6e63m0_spi_of_match[] = {
  71         { .compatible = "samsung,s6e63m0" },
  72         { /* sentinel */ }
  73 };
  74 MODULE_DEVICE_TABLE(of, s6e63m0_spi_of_match);
  75
  76 static struct spi_driver s6e63m0_spi_driver = {
  77         .probe                  = s6e63m0_spi_probe,
  78         .remove                 = s6e63m0_spi_remove,
  79         .driver                 = {
  80                 .name           = "panel-samsung-s6e63m0",
  81                 .of_match_table = s6e63m0_spi_of_match,
  82         },
  83 };
  84 module_spi_driver(s6e63m0_spi_driver);
  85
  86 MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
  87 MODULE_DESCRIPTION("s6e63m0 LCD SPI Driver");
  88 MODULE_LICENSE("GPL v2");