drivers/video/backlight/lms283gf05.c

   1 /*
   2  * lms283gf05.c -- support for Samsung LMS283GF05 LCD
   3  *
   4  * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/kernel.h>
  13 #include <linux/delay.h>
  14 #include <linux/slab.h>
  15 #include <linux/gpio.h>
  16 #include <linux/lcd.h>
  17
  18 #include <linux/spi/spi.h>
  19 #include <linux/spi/lms283gf05.h>
  20 #include <linux/module.h>
  21
  22 struct lms283gf05_state {
  23         struct spi_device       *spi;
  24         struct lcd_device       *ld;
  25 };
  26
  27 struct lms283gf05_seq {
  28         unsigned char           reg;
  29         unsigned short          value;
  30         unsigned char           delay;
  31 };
  32
  33 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
  34 static const struct lms283gf05_seq disp_initseq[] = {
  35         /* REG, VALUE, DELAY */
  36         { 0x07, 0x0000, 0 },
  37         { 0x13, 0x0000, 10 },
  38
  39         { 0x11, 0x3004, 0 },
  40         { 0x14, 0x200F, 0 },
  41         { 0x10, 0x1a20, 0 },
  42         { 0x13, 0x0040, 50 },
  43
  44         { 0x13, 0x0060, 0 },
  45         { 0x13, 0x0070, 200 },
  46
  47         { 0x01, 0x0127, 0 },
  48         { 0x02, 0x0700, 0 },
  49         { 0x03, 0x1030, 0 },
  50         { 0x08, 0x0208, 0 },
  51         { 0x0B, 0x0620, 0 },
  52         { 0x0C, 0x0110, 0 },
  53         { 0x30, 0x0120, 0 },
  54         { 0x31, 0x0127, 0 },
  55         { 0x32, 0x0000, 0 },
  56         { 0x33, 0x0503, 0 },
  57         { 0x34, 0x0727, 0 },
  58         { 0x35, 0x0124, 0 },
  59         { 0x36, 0x0706, 0 },
  60         { 0x37, 0x0701, 0 },
  61         { 0x38, 0x0F00, 0 },
  62         { 0x39, 0x0F00, 0 },
  63         { 0x40, 0x0000, 0 },
  64         { 0x41, 0x0000, 0 },
  65         { 0x42, 0x013f, 0 },
  66         { 0x43, 0x0000, 0 },
  67         { 0x44, 0x013f, 0 },
  68         { 0x45, 0x0000, 0 },
  69         { 0x46, 0xef00, 0 },
  70         { 0x47, 0x013f, 0 },
  71         { 0x48, 0x0000, 0 },
  72         { 0x07, 0x0015, 30 },
  73
  74         { 0x07, 0x0017, 0 },
  75
  76         { 0x20, 0x0000, 0 },
  77         { 0x21, 0x0000, 0 },
  78         { 0x22, 0x0000, 0 }
  79 };
  80
  81 static const struct lms283gf05_seq disp_pdwnseq[] = {
  82         { 0x07, 0x0016, 30 },
  83
  84         { 0x07, 0x0004, 0 },
  85         { 0x10, 0x0220, 20 },
  86
  87         { 0x13, 0x0060, 50 },
  88
  89         { 0x13, 0x0040, 50 },
  90
  91         { 0x13, 0x0000, 0 },
  92         { 0x10, 0x0000, 0 }
  93 };
  94
  95
  96 static void lms283gf05_reset(unsigned long gpio, bool inverted)
  97 {
  98         gpio_set_value(gpio, !inverted);
  99         mdelay(100);
 100         gpio_set_value(gpio, inverted);
 101         mdelay(20);
 102         gpio_set_value(gpio, !inverted);
 103         mdelay(20);
 104 }
 105
 106 static void lms283gf05_toggle(struct spi_device *spi,
 107                                 const struct lms283gf05_seq *seq, int sz)
 108 {
 109         char buf[3];
 110         int i;
 111
 112         for (i = 0; i < sz; i++) {
 113                 buf[0] = 0x74;
 114                 buf[1] = 0x00;
 115                 buf[2] = seq[i].reg;
 116                 spi_write(spi, buf, 3);
 117
 118                 buf[0] = 0x76;
 119                 buf[1] = seq[i].value >> 8;
 120                 buf[2] = seq[i].value & 0xff;
 121                 spi_write(spi, buf, 3);
 122
 123                 mdelay(seq[i].delay);
 124         }
 125 }
 126
 127 static int lms283gf05_power_set(struct lcd_device *ld, int power)
 128 {
 129         struct lms283gf05_state *st = lcd_get_data(ld);
 130         struct spi_device *spi = st->spi;
 131         struct lms283gf05_pdata *pdata = spi->dev.platform_data;
 132
 133         if (power <= FB_BLANK_NORMAL) {
 134                 if (pdata)
 135                         lms283gf05_reset(pdata->reset_gpio,
 136                                         pdata->reset_inverted);
 137                 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 138         } else {
 139                 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
 140                 if (pdata)
 141                         gpio_set_value(pdata->reset_gpio,
 142                                         pdata->reset_inverted);
 143         }
 144
 145         return 0;
 146 }
 147
 148 static struct lcd_ops lms_ops = {
 149         .set_power      = lms283gf05_power_set,
 150         .get_power      = NULL,
 151 };
 152
 153 static int lms283gf05_probe(struct spi_device *spi)
 154 {
 155         struct lms283gf05_state *st;
 156         struct lms283gf05_pdata *pdata = spi->dev.platform_data;
 157         struct lcd_device *ld;
 158         int ret = 0;
 159
 160         if (pdata != NULL) {
 161                 ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
 162                                 GPIOF_DIR_OUT | (!pdata->reset_inverted ?
 163                                 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
 164                                 "LMS285GF05 RESET");
 165                 if (ret)
 166                         return ret;
 167         }
 168
 169         st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
 170                                 GFP_KERNEL);
 171         if (st == NULL) {
 172                 dev_err(&spi->dev, "No memory for device state\n");
 173                 return -ENOMEM;
 174         }
 175
 176         ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
 177         if (IS_ERR(ld))
 178                 return PTR_ERR(ld);
 179
 180         st->spi = spi;
 181         st->ld = ld;
 182
 183         spi_set_drvdata(spi, st);
 184
 185         /* kick in the LCD */
 186         if (pdata)
 187                 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
 188         lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 189
 190         return 0;
 191 }
 192
 193 static int lms283gf05_remove(struct spi_device *spi)
 194 {
 195         struct lms283gf05_state *st = spi_get_drvdata(spi);
 196
 197         lcd_device_unregister(st->ld);
 198
 199         return 0;
 200 }
 201
 202 static struct spi_driver lms283gf05_driver = {
 203         .driver = {
 204                 .name   = "lms283gf05",
 205                 .owner  = THIS_MODULE,
 206         },
 207         .probe          = lms283gf05_probe,
 208         .remove         = lms283gf05_remove,
 209 };
 210
 211 module_spi_driver(lms283gf05_driver);
 212
 213 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 214 MODULE_DESCRIPTION("LCD283GF05 LCD");
 215 MODULE_LICENSE("GPL v2");