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/gpio.h>
  15 #include <linux/lcd.h>
  16
  17 #include <linux/spi/spi.h>
  18 #include <linux/spi/lms283gf05.h>
  19
  20 struct lms283gf05_state {
  21         struct spi_device       *spi;
  22         struct lcd_device       *ld;
  23 };
  24
  25 struct lms283gf05_seq {
  26         unsigned char           reg;
  27         unsigned short          value;
  28         unsigned char           delay;
  29 };
  30
  31 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
  32 static struct lms283gf05_seq disp_initseq[] = {
  33         /* REG, VALUE, DELAY */
  34         { 0x07, 0x0000, 0 },
  35         { 0x13, 0x0000, 10 },
  36
  37         { 0x11, 0x3004, 0 },
  38         { 0x14, 0x200F, 0 },
  39         { 0x10, 0x1a20, 0 },
  40         { 0x13, 0x0040, 50 },
  41
  42         { 0x13, 0x0060, 0 },
  43         { 0x13, 0x0070, 200 },
  44
  45         { 0x01, 0x0127, 0 },
  46         { 0x02, 0x0700, 0 },
  47         { 0x03, 0x1030, 0 },
  48         { 0x08, 0x0208, 0 },
  49         { 0x0B, 0x0620, 0 },
  50         { 0x0C, 0x0110, 0 },
  51         { 0x30, 0x0120, 0 },
  52         { 0x31, 0x0127, 0 },
  53         { 0x32, 0x0000, 0 },
  54         { 0x33, 0x0503, 0 },
  55         { 0x34, 0x0727, 0 },
  56         { 0x35, 0x0124, 0 },
  57         { 0x36, 0x0706, 0 },
  58         { 0x37, 0x0701, 0 },
  59         { 0x38, 0x0F00, 0 },
  60         { 0x39, 0x0F00, 0 },
  61         { 0x40, 0x0000, 0 },
  62         { 0x41, 0x0000, 0 },
  63         { 0x42, 0x013f, 0 },
  64         { 0x43, 0x0000, 0 },
  65         { 0x44, 0x013f, 0 },
  66         { 0x45, 0x0000, 0 },
  67         { 0x46, 0xef00, 0 },
  68         { 0x47, 0x013f, 0 },
  69         { 0x48, 0x0000, 0 },
  70         { 0x07, 0x0015, 30 },
  71
  72         { 0x07, 0x0017, 0 },
  73
  74         { 0x20, 0x0000, 0 },
  75         { 0x21, 0x0000, 0 },
  76         { 0x22, 0x0000, 0 }
  77 };
  78
  79 static struct lms283gf05_seq disp_pdwnseq[] = {
  80         { 0x07, 0x0016, 30 },
  81
  82         { 0x07, 0x0004, 0 },
  83         { 0x10, 0x0220, 20 },
  84
  85         { 0x13, 0x0060, 50 },
  86
  87         { 0x13, 0x0040, 50 },
  88
  89         { 0x13, 0x0000, 0 },
  90         { 0x10, 0x0000, 0 }
  91 };
  92
  93
  94 static void lms283gf05_reset(unsigned long gpio, bool inverted)
  95 {
  96         gpio_set_value(gpio, !inverted);
  97         mdelay(100);
  98         gpio_set_value(gpio, inverted);
  99         mdelay(20);
 100         gpio_set_value(gpio, !inverted);
 101         mdelay(20);
 102 }
 103
 104 static void lms283gf05_toggle(struct spi_device *spi,
 105                         struct lms283gf05_seq *seq, int sz)
 106 {
 107         char buf[3];
 108         int i;
 109
 110         for (i = 0; i < sz; i++) {
 111                 buf[0] = 0x74;
 112                 buf[1] = 0x00;
 113                 buf[2] = seq[i].reg;
 114                 spi_write(spi, buf, 3);
 115
 116                 buf[0] = 0x76;
 117                 buf[1] = seq[i].value >> 8;
 118                 buf[2] = seq[i].value & 0xff;
 119                 spi_write(spi, buf, 3);
 120
 121                 mdelay(seq[i].delay);
 122         }
 123 }
 124
 125 static int lms283gf05_power_set(struct lcd_device *ld, int power)
 126 {
 127         struct lms283gf05_state *st = lcd_get_data(ld);
 128         struct spi_device *spi = st->spi;
 129         struct lms283gf05_pdata *pdata = spi->dev.platform_data;
 130
 131         if (power) {
 132                 if (pdata)
 133                         lms283gf05_reset(pdata->reset_gpio,
 134                                         pdata->reset_inverted);
 135                 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 136         } else {
 137                 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
 138                 if (pdata)
 139                         gpio_set_value(pdata->reset_gpio,
 140                                         pdata->reset_inverted);
 141         }
 142
 143         return 0;
 144 }
 145
 146 static struct lcd_ops lms_ops = {
 147         .set_power      = lms283gf05_power_set,
 148         .get_power      = NULL,
 149 };
 150
 151 static int __devinit lms283gf05_probe(struct spi_device *spi)
 152 {
 153         struct lms283gf05_state *st;
 154         struct lms283gf05_pdata *pdata = spi->dev.platform_data;
 155         struct lcd_device *ld;
 156         int ret = 0;
 157
 158         if (pdata != NULL) {
 159                 ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
 160                 if (ret)
 161                         return ret;
 162
 163                 ret = gpio_direction_output(pdata->reset_gpio,
 164                                                 !pdata->reset_inverted);
 165                 if (ret)
 166                         goto err;
 167         }
 168
 169         st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
 170         if (st == NULL) {
 171                 dev_err(&spi->dev, "No memory for device state\n");
 172                 ret = -ENOMEM;
 173                 goto err;
 174         }
 175
 176         ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
 177         if (IS_ERR(ld)) {
 178                 ret = PTR_ERR(ld);
 179                 goto err2;
 180         }
 181
 182         st->spi = spi;
 183         st->ld = ld;
 184
 185         dev_set_drvdata(&spi->dev, st);
 186
 187         /* kick in the LCD */
 188         if (pdata)
 189                 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
 190         lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 191
 192         return 0;
 193
 194 err2:
 195         kfree(st);
 196 err:
 197         if (pdata != NULL)
 198                 gpio_free(pdata->reset_gpio);
 199
 200         return ret;
 201 }
 202
 203 static int __devexit lms283gf05_remove(struct spi_device *spi)
 204 {
 205         struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
 206         struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
 207
 208         lcd_device_unregister(st->ld);
 209
 210         if (pdata != NULL)
 211                 gpio_free(pdata->reset_gpio);
 212
 213         kfree(st);
 214
 215         return 0;
 216 }
 217
 218 static struct spi_driver lms283gf05_driver = {
 219         .driver = {
 220                 .name   = "lms283gf05",
 221                 .owner  = THIS_MODULE,
 222         },
 223         .probe          = lms283gf05_probe,
 224         .remove         = __devexit_p(lms283gf05_remove),
 225 };
 226
 227 static __init int lms283gf05_init(void)
 228 {
 229         return spi_register_driver(&lms283gf05_driver);
 230 }
 231
 232 static __exit void lms283gf05_exit(void)
 233 {
 234         spi_unregister_driver(&lms283gf05_driver);
 235 }
 236
 237 module_init(lms283gf05_init);
 238 module_exit(lms283gf05_exit);
 239
 240 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 241 MODULE_DESCRIPTION("LCD283GF05 LCD");
 242 MODULE_LICENSE("GPL v2");