target/linux/xburst/patches-2.6.37/100-lcm.patch

   1 From 85061058491114869860964b73e2ae0aacce446e 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 03/23] Add ili8960 lcd driver
   5
   6 ---
   7  drivers/video/backlight/Kconfig   |    7 +
   8  drivers/video/backlight/Makefile  |    1 +
   9  drivers/video/backlight/ili8960.c |  263 +++++++++++++++++++++++++++++++++++++
  10  3 files changed, 271 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 +1,263 @@
  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 +       unsigned int brightness;
  69 +};
  70 +
  71 +#define ILI8960_REG_BRIGHTNESS 0x03
  72 +#define ILI8960_REG_POWER      0x05
  73 +#define ILI8960_REG_CONTRAST   0x0d
  74 +
  75 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
  76 +                               uint8_t data)
  77 +{
  78 +       uint8_t buf[2];
  79 +       buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
  80 +       buf[1] = data;
  81 +
  82 +       return spi_write(spi, buf, sizeof(buf));
  83 +}
  84 +
  85 +static int ili8960_programm_power(struct spi_device *spi, bool enabled)
  86 +{
  87 +       int ret;
  88 +
  89 +       if (enabled)
  90 +               mdelay(20);
  91 +
  92 +       ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
  93 +
  94 +       if (!enabled)
  95 +               mdelay(20);
  96 +
  97 +       return ret;
  98 +}
  99 +
 100 +static int ili8960_set_power(struct lcd_device *lcd, int power)
 101 +{
 102 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 103 +
 104 +       switch (power) {
 105 +       case FB_BLANK_UNBLANK:
 106 +               ili8960->enabled = true;
 107 +               break;
 108 +       default:
 109 +               ili8960->enabled = false;
 110 +               break;
 111 +       }
 112 +
 113 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 114 +}
 115 +
 116 +static int ili8960_get_power(struct lcd_device *lcd)
 117 +{
 118 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 119 +       return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 120 +}
 121 +
 122 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
 123 +{
 124 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 125 +
 126 +       return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
 127 +}
 128 +
 129 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 130 +{
 131 +       if (mode->xres != 320 && mode->yres != 240)
 132 +               return -EINVAL;
 133 +
 134 +       return 0;
 135 +}
 136 +
 137 +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
 138 +{
 139 +       int ret;
 140 +
 141 +       ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
 142 +
 143 +       if (ret == 0)
 144 +               ili8960->brightness = brightness;
 145 +
 146 +       return ret;
 147 +}
 148 +
 149 +static ssize_t ili8960_show_brightness(struct device *dev,
 150 +               struct device_attribute *attr, char *buf)
 151 +{
 152 +       struct lcd_device *ld = to_lcd_device(dev);
 153 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 154 +
 155 +       return sprintf(buf, "%u\n", ili8960->brightness);
 156 +}
 157 +
 158 +static ssize_t ili8960_store_brightness(struct device *dev,
 159 +               struct device_attribute *attr, const char *buf, size_t count)
 160 +{
 161 +       struct lcd_device *ld = to_lcd_device(dev);
 162 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 163 +       unsigned long brightness;
 164 +       int ret;
 165 +
 166 +       ret = strict_strtoul(buf, 0, &brightness);
 167 +       if (ret)
 168 +               return ret;
 169 +
 170 +       if (brightness > 255)
 171 +               return -EINVAL;
 172 +
 173 +       ili8960_set_brightness(ili8960, brightness);
 174 +
 175 +       return count;
 176 +}
 177 +
 178 +
 179 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
 180 +       ili8960_store_brightness);
 181 +
 182 +static struct lcd_ops ili8960_lcd_ops = {
 183 +       .set_power = ili8960_set_power,
 184 +       .get_power = ili8960_get_power,
 185 +       .set_contrast = ili8960_set_contrast,
 186 +       .set_mode = ili8960_set_mode,
 187 +};
 188 +
 189 +static int __devinit ili8960_probe(struct spi_device *spi)
 190 +{
 191 +       int ret;
 192 +       struct ili8960 *ili8960;
 193 +
 194 +       ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
 195 +       if (!ili8960)
 196 +               return -ENOMEM;
 197 +
 198 +       spi->bits_per_word = 8;
 199 +       spi->mode = SPI_MODE_3;
 200 +
 201 +       ret = spi_setup(spi);
 202 +       if (ret) {
 203 +               dev_err(&spi->dev, "Failed to setup spi\n");
 204 +               goto err_free_ili8960;
 205 +       }
 206 +
 207 +       ili8960->spi = spi;
 208 +
 209 +       ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
 210 +                                               &ili8960_lcd_ops);
 211 +
 212 +       if (IS_ERR(ili8960->lcd)) {
 213 +               ret = PTR_ERR(ili8960->lcd);
 214 +               dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
 215 +               goto err_free_ili8960;
 216 +       }
 217 +
 218 +       ili8960->lcd->props.max_contrast = 255;
 219 +
 220 +       ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
 221 +       if (ret)
 222 +               goto err_unregister_lcd;
 223 +
 224 +       ili8960_programm_power(ili8960->spi, true);
 225 +       ili8960->enabled = true;
 226 +
 227 +       spi_set_drvdata(spi, ili8960);
 228 +
 229 +       ili8960_write_reg(spi, 0x13, 0x01);
 230 +
 231 +       return 0;
 232 +err_unregister_lcd:
 233 +       lcd_device_unregister(ili8960->lcd);
 234 +err_free_ili8960:
 235 +       kfree(ili8960);
 236 +       return ret;
 237 +}
 238 +
 239 +static int __devexit ili8960_remove(struct spi_device *spi)
 240 +{
 241 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 242 +
 243 +       device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
 244 +       lcd_device_unregister(ili8960->lcd);
 245 +
 246 +       spi_set_drvdata(spi, NULL);
 247 +       kfree(ili8960);
 248 +       return 0;
 249 +}
 250 +
 251 +#ifdef CONFIG_PM
 252 +
 253 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
 254 +{
 255 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 256 +
 257 +       if (ili8960->enabled)
 258 +               ili8960_programm_power(ili8960->spi, false);
 259 +
 260 +       return 0;
 261 +}
 262 +
 263 +static int ili8960_resume(struct spi_device *spi)
 264 +{
 265 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 266 +
 267 +       if (ili8960->enabled)
 268 +               ili8960_programm_power(ili8960->spi, true);
 269 +
 270 +       return 0;
 271 +}
 272 +
 273 +#else
 274 +#define ili8960_suspend NULL
 275 +#define ili8960_resume NULL
 276 +#endif
 277 +
 278 +static struct spi_driver ili8960_driver = {
 279 +       .driver = {
 280 +               .name = "ili8960",
 281 +               .owner = THIS_MODULE,
 282 +       },
 283 +       .probe = ili8960_probe,
 284 +       .remove = __devexit_p(ili8960_remove),
 285 +       .suspend = ili8960_suspend,
 286 +       .resume = ili8960_resume,
 287 +};
 288 +
 289 +static int __init ili8960_init(void)
 290 +{
 291 +       return spi_register_driver(&ili8960_driver);
 292 +}
 293 +module_init(ili8960_init);
 294 +
 295 +static void __exit ili8960_exit(void)
 296 +{
 297 +       spi_unregister_driver(&ili8960_driver);
 298 +}
 299 +module_exit(ili8960_exit)
 300 +
 301 +MODULE_AUTHOR("Lars-Peter Clausen");
 302 +MODULE_LICENSE("GPL");
 303 +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
 304 +MODULE_ALIAS("spi:ili8960");