release/src-rt-6.x.4708/linux/linux-2.6.36/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
  21 struct lms283gf05_state {
  22         struct spi_device       *spi;
  23         struct lcd_device       *ld;
  24 };
  25
  26 struct lms283gf05_seq {
  27         unsigned char           reg;
  28         unsigned short          value;
  29         unsigned char           delay;
  30 };
  31
  32 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
  33 static struct lms283gf05_seq disp_initseq[] = {
  34         /* REG, VALUE, DELAY */
  35         { 0x07, 0x0000, 0 },
  36         { 0x13, 0x0000, 10 },
  37
  38         { 0x11, 0x3004, 0 },
  39         { 0x14, 0x200F, 0 },
  40         { 0x10, 0x1a20, 0 },
  41         { 0x13, 0x0040, 50 },
  42
  43         { 0x13, 0x0060, 0 },
  44         { 0x13, 0x0070, 200 },
  45
  46         { 0x01, 0x0127, 0 },
  47         { 0x02, 0x0700, 0 },
  48         { 0x03, 0x1030, 0 },
  49         { 0x08, 0x0208, 0 },
  50         { 0x0B, 0x0620, 0 },
  51         { 0x0C, 0x0110, 0 },
  52         { 0x30, 0x0120, 0 },
  53         { 0x31, 0x0127, 0 },
  54         { 0x32, 0x0000, 0 },
  55         { 0x33, 0x0503, 0 },
  56         { 0x34, 0x0727, 0 },
  57         { 0x35, 0x0124, 0 },
  58         { 0x36, 0x0706, 0 },
  59         { 0x37, 0x0701, 0 },
  60         { 0x38, 0x0F00, 0 },
  61         { 0x39, 0x0F00, 0 },
  62         { 0x40, 0x0000, 0 },
  63         { 0x41, 0x0000, 0 },
  64         { 0x42, 0x013f, 0 },
  65         { 0x43, 0x0000, 0 },
  66         { 0x44, 0x013f, 0 },
  67         { 0x45, 0x0000, 0 },
  68         { 0x46, 0xef00, 0 },
  69         { 0x47, 0x013f, 0 },
  70         { 0x48, 0x0000, 0 },
  71         { 0x07, 0x0015, 30 },
  72
  73         { 0x07, 0x0017, 0 },
  74
  75         { 0x20, 0x0000, 0 },
  76         { 0x21, 0x0000, 0 },
  77         { 0x22, 0x0000, 0 }
  78 };
  79
  80 static struct lms283gf05_seq disp_pdwnseq[] = {
  81         { 0x07, 0x0016, 30 },
  82
  83         { 0x07, 0x0004, 0 },
  84         { 0x10, 0x0220, 20 },
  85
  86         { 0x13, 0x0060, 50 },
  87
  88         { 0x13, 0x0040, 50 },
  89
  90         { 0x13, 0x0000, 0 },
  91         { 0x10, 0x0000, 0 }
  92 };
  93
  94
  95 static void lms283gf05_reset(unsigned long gpio, bool inverted)
  96 {
  97         gpio_set_value(gpio, !inverted);
  98         mdelay(100);
  99         gpio_set_value(gpio, inverted);
 100         mdelay(20);
 101         gpio_set_value(gpio, !inverted);
 102         mdelay(20);
 103 }
 104
 105 static void lms283gf05_toggle(struct spi_device *spi,
 106                         struct lms283gf05_seq *seq, int sz)
 107 {
 108         char buf[3];
 109         int i;
 110
 111         for (i = 0; i < sz; i++) {
 112                 buf[0] = 0x74;
 113                 buf[1] = 0x00;
 114                 buf[2] = seq[i].reg;
 115                 spi_write(spi, buf, 3);
 116
 117                 buf[0] = 0x76;
 118                 buf[1] = seq[i].value >> 8;
 119                 buf[2] = seq[i].value & 0xff;
 120                 spi_write(spi, buf, 3);
 121
 122                 mdelay(seq[i].delay);
 123         }
 124 }
 125
 126 static int lms283gf05_power_set(struct lcd_device *ld, int power)
 127 {
 128         struct lms283gf05_state *st = lcd_get_data(ld);
 129         struct spi_device *spi = st->spi;
 130         struct lms283gf05_pdata *pdata = spi->dev.platform_data;
 131
 132         if (power) {
 133                 if (pdata)
 134                         lms283gf05_reset(pdata->reset_gpio,
 135                                         pdata->reset_inverted);
 136                 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 137         } else {
 138                 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
 139                 if (pdata)
 140                         gpio_set_value(pdata->reset_gpio,
 141                                         pdata->reset_inverted);
 142         }
 143
 144         return 0;
 145 }
 146
 147 static struct lcd_ops lms_ops = {
 148         .set_power      = lms283gf05_power_set,
 149         .get_power      = NULL,
 150 };
 151
 152 static int __devinit lms283gf05_probe(struct spi_device *spi)
 153 {
 154         struct lms283gf05_state *st;
 155         struct lms283gf05_pdata *pdata = spi->dev.platform_data;
 156         struct lcd_device *ld;
 157         int ret = 0;
 158
 159         if (pdata != NULL) {
 160                 ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
 161                 if (ret)
 162                         return ret;
 163
 164                 ret = gpio_direction_output(pdata->reset_gpio,
 165                                                 !pdata->reset_inverted);
 166                 if (ret)
 167                         goto err;
 168         }
 169
 170         st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
 171         if (st == NULL) {
 172                 dev_err(&spi->dev, "No memory for device state\n");
 173                 ret = -ENOMEM;
 174                 goto err;
 175         }
 176
 177         ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
 178         if (IS_ERR(ld)) {
 179                 ret = PTR_ERR(ld);
 180                 goto err2;
 181         }
 182
 183         st->spi = spi;
 184         st->ld = ld;
 185
 186         dev_set_drvdata(&spi->dev, st);
 187
 188         /* kick in the LCD */
 189         if (pdata)
 190                 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
 191         lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 192
 193         return 0;
 194
 195 err2:
 196         kfree(st);
 197 err:
 198         if (pdata != NULL)
 199                 gpio_free(pdata->reset_gpio);
 200
 201         return ret;
 202 }
 203
 204 static int __devexit lms283gf05_remove(struct spi_device *spi)
 205 {
 206         struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
 207         struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
 208
 209         lcd_device_unregister(st->ld);
 210
 211         if (pdata != NULL)
 212                 gpio_free(pdata->reset_gpio);
 213
 214         kfree(st);
 215
 216         return 0;
 217 }
 218
 219 static struct spi_driver lms283gf05_driver = {
 220         .driver = {
 221                 .name   = "lms283gf05",
 222                 .owner  = THIS_MODULE,
 223         },
 224         .probe          = lms283gf05_probe,
 225         .remove         = __devexit_p(lms283gf05_remove),
 226 };
 227
 228 static __init int lms283gf05_init(void)
 229 {
 230         return spi_register_driver(&lms283gf05_driver);
 231 }
 232
 233 static __exit void lms283gf05_exit(void)
 234 {
 235         spi_unregister_driver(&lms283gf05_driver);
 236 }
 237
 238 module_init(lms283gf05_init);
 239 module_exit(lms283gf05_exit);
 240
 241 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 242 MODULE_DESCRIPTION("LCD283GF05 LCD");
 243 MODULE_LICENSE("GPL v2");