target/linux/xburst/patches-2.6.36/100-lcm.patch

   1 From cb0cdd5f614d723139331ecf56d28e529ff9b74c Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Sun, 1 Aug 2010 21:19:40 +0200
   4 Subject: [PATCH] Add ili8960 lcd driver
   5
   6 ---
   7  drivers/video/backlight/Kconfig   |    7 +
   8  drivers/video/backlight/Makefile  |    1 +
   9  drivers/video/backlight/ili8960.c |  253 +++++++++++++++++++++++++++++++++++++
  10  3 files changed, 261 insertions(+), 0 deletions(-)
  11  create mode 100644 drivers/video/backlight/ili8960.c
  12
  13 --- a/drivers/video/backlight/Kconfig
  14 +++ b/drivers/video/backlight/Kconfig
  15 @@ -59,6 +59,13 @@ config LCD_LTV350QV
  16
  17           The LTV350QV panel is present on all ATSTK1000 boards.
  18
  19 +config LCD_ILI8960
  20 +       tristate "Ilitek ili8960 LCD driver"
  21 +       depends on LCD_CLASS_DEVICE && SPI
  22 +       default n
  23 +       help
  24 +         Driver for the Ilitek ili8960 LCD controller chip.
  25 +
  26  config LCD_ILI9320
  27         tristate
  28         help
  29 --- a/drivers/video/backlight/Makefile
  30 +++ b/drivers/video/backlight/Makefile
  31 @@ -6,6 +6,7 @@ obj-$(CONFIG_LCD_HP700)            += jornada72
  32  obj-$(CONFIG_LCD_L4F00242T03)     += l4f00242t03.o
  33  obj-$(CONFIG_LCD_LMS283GF05)      += lms283gf05.o
  34  obj-$(CONFIG_LCD_LTV350QV)        += ltv350qv.o
  35 +obj-$(CONFIG_LCD_ILI8960)         += ili8960.o
  36  obj-$(CONFIG_LCD_ILI9320)         += ili9320.o
  37  obj-$(CONFIG_LCD_PLATFORM)        += platform_lcd.o
  38  obj-$(CONFIG_LCD_VGG2432A4)       += vgg2432a4.o
  39 --- /dev/null
  40 +++ b/drivers/video/backlight/ili8960.c
  41 @@ -0,0 +1,253 @@
  42 +/*
  43 + *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  44 + *  Driver for Ilitek ili8960 LCD
  45 + *
  46 + *  This program is free software; you can redistribute         it and/or modify it
  47 + *  under  the terms of         the GNU General  Public License as published by the
  48 + *  Free Software Foundation;  either version 2 of the License, or (at your
  49 + *  option) any later version.
  50 + *
  51 + *  You should have received a copy of the  GNU General Public License along
  52 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  53 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  54 + *
  55 + */
  56 +
  57 +#include <linux/module.h>
  58 +#include <linux/spi/spi.h>
  59 +#include <linux/lcd.h>
  60 +#include <linux/backlight.h>
  61 +#include <linux/delay.h>
  62 +
  63 +struct ili8960 {
  64 +       struct spi_device *spi;
  65 +       struct lcd_device *lcd;
  66 +       struct backlight_device *bl;
  67 +       bool enabled;
  68 +       int brightness;
  69 +};
  70 +
  71 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
  72 +                               uint8_t data)
  73 +{
  74 +       uint8_t buf[2];
  75 +       buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
  76 +       buf[1] = data;
  77 +
  78 +       return spi_write(spi, buf, sizeof(buf));
  79 +}
  80 +
  81 +static int ili8960_programm_power(struct spi_device *spi, bool enabled)
  82 +{
  83 +       int ret;
  84 +
  85 +       if (enabled)
  86 +               mdelay(20);
  87 +
  88 +       ret = ili8960_write_reg(spi, 0x5, enabled ? 0xc7 : 0xc6);
  89 +
  90 +       if (!enabled)
  91 +               mdelay(20);
  92 +
  93 +       return ret;
  94 +}
  95 +
  96 +static int ili8960_set_power(struct lcd_device *lcd, int power)
  97 +{
  98 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
  99 +
 100 +       switch (power) {
 101 +       case FB_BLANK_UNBLANK:
 102 +               ili8960->enabled = true;
 103 +               break;
 104 +       default:
 105 +               ili8960->enabled = false;
 106 +               break;
 107 +       }
 108 +
 109 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 110 +}
 111 +
 112 +static int ili8960_get_power(struct lcd_device *lcd)
 113 +{
 114 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 115 +       return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 116 +}
 117 +
 118 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
 119 +{
 120 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 121 +       ili8960_write_reg(ili8960->spi, 0x0d, contrast);
 122 +
 123 +       return 0;
 124 +}
 125 +
 126 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 127 +{
 128 +       if (mode->xres != 320 && mode->yres != 240)
 129 +               return -EINVAL;
 130 +
 131 +       return 0;
 132 +}
 133 +
 134 +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
 135 +{
 136 +       int ret;
 137 +       ret = ili8960_write_reg(ili8960->spi, 0x3, brightness);
 138 +
 139 +       if (ret == 0)
 140 +               ili8960->brightness = brightness;
 141 +
 142 +       return ret;
 143 +}
 144 +
 145 +static ssize_t ili8960_show_brightness(struct device *dev,
 146 +               struct device_attribute *attr, char *buf)
 147 +{
 148 +       struct lcd_device *ld = to_lcd_device(dev);
 149 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 150 +
 151 +       return sprintf(buf, "%d\n", ili8960->brightness);
 152 +}
 153 +
 154 +static ssize_t ili8960_store_brightness(struct device *dev,
 155 +               struct device_attribute *attr, const char *buf, size_t count)
 156 +{
 157 +       char *endp;
 158 +       struct lcd_device *ld = to_lcd_device(dev);
 159 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 160 +       int brightness = simple_strtoul(buf, &endp, 0);
 161 +
 162 +       if (brightness > 255 || brightness < 0)
 163 +               return -EINVAL;
 164 +
 165 +       ili8960_set_brightness(ili8960, brightness);
 166 +
 167 +       return count;
 168 +}
 169 +
 170 +
 171 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
 172 +       ili8960_store_brightness);
 173 +
 174 +static struct lcd_ops ili8960_lcd_ops = {
 175 +       .set_power = ili8960_set_power,
 176 +       .get_power = ili8960_get_power,
 177 +       .set_contrast = ili8960_set_contrast,
 178 +       .set_mode = ili8960_set_mode,
 179 +};
 180 +
 181 +static int __devinit ili8960_probe(struct spi_device *spi)
 182 +{
 183 +       int ret;
 184 +       struct ili8960 *ili8960;
 185 +
 186 +       ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
 187 +
 188 +       spi->bits_per_word = 8;
 189 +       spi->mode = SPI_MODE_3;
 190 +
 191 +       ret = spi_setup(spi);
 192 +       if (ret) {
 193 +               dev_err(&spi->dev, "Failed to setup spi\n");
 194 +               goto err_free_ili8960;
 195 +       }
 196 +
 197 +       ili8960->spi = spi;
 198 +
 199 +       ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
 200 +                                               &ili8960_lcd_ops);
 201 +
 202 +       if (IS_ERR(ili8960->lcd)) {
 203 +               ret = PTR_ERR(ili8960->lcd);
 204 +               dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
 205 +               goto err_free_ili8960;
 206 +       }
 207 +
 208 +       ili8960->lcd->props.max_contrast = 255;
 209 +
 210 +       ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
 211 +       if (ret)
 212 +               goto err_unregister_lcd;
 213 +
 214 +       ili8960_programm_power(ili8960->spi, true);
 215 +       ili8960->enabled = true;
 216 +       dev_set_drvdata(&spi->dev, ili8960);
 217 +
 218 +       ili8960_write_reg(spi, 0x13, 0x01);
 219 +       ili8960_write_reg(spi, 0x5, 0xc7);
 220 +
 221 +       return 0;
 222 +err_unregister_lcd:
 223 +       lcd_device_unregister(ili8960->lcd);
 224 +err_free_ili8960:
 225 +       kfree(ili8960);
 226 +       return ret;
 227 +}
 228 +
 229 +static int __devexit ili8960_remove(struct spi_device *spi)
 230 +{
 231 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 232 +
 233 +       device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
 234 +       lcd_device_unregister(ili8960->lcd);
 235 +
 236 +       spi_set_drvdata(spi, NULL);
 237 +       kfree(ili8960);
 238 +       return 0;
 239 +}
 240 +
 241 +#ifdef CONFIG_PM
 242 +
 243 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
 244 +{
 245 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 246 +
 247 +       if (ili8960->enabled)
 248 +               ili8960_programm_power(ili8960->spi, false);
 249 +
 250 +       return 0;
 251 +}
 252 +
 253 +static int ili8960_resume(struct spi_device *spi)
 254 +{
 255 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 256 +
 257 +       if (ili8960->enabled)
 258 +               ili8960_programm_power(ili8960->spi, true);
 259 +
 260 +       return 0;
 261 +}
 262 +
 263 +#else
 264 +#define ili8960_suspend NULL
 265 +#define ili8960_resume NULL
 266 +#endif
 267 +
 268 +static struct spi_driver ili8960_driver = {
 269 +       .driver = {
 270 +               .name = "ili8960",
 271 +               .owner = THIS_MODULE,
 272 +       },
 273 +       .probe = ili8960_probe,
 274 +       .remove = __devexit_p(ili8960_remove),
 275 +       .suspend = ili8960_suspend,
 276 +       .resume = ili8960_resume,
 277 +};
 278 +
 279 +static int __init ili8960_init(void)
 280 +{
 281 +       return spi_register_driver(&ili8960_driver);
 282 +}
 283 +module_init(ili8960_init);
 284 +
 285 +static void __exit ili8960_exit(void)
 286 +{
 287 +       spi_unregister_driver(&ili8960_driver);
 288 +}
 289 +module_exit(ili8960_exit)
 290 +
 291 +MODULE_AUTHOR("Lars-Peter Clausen");
 292 +MODULE_LICENSE("GPL");
 293 +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
 294 +MODULE_ALIAS("spi:ili8960");