target/linux/xburst/patches-2.6.35/101-lcm.patch

   1 From 2e27414748a56d8583c151d926da54e7e9d2c23f 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 |  254 +++++++++++++++++++++++++++++++++++++
  10  3 files changed, 262 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 +1,254 @@
  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 +       unsigned enabled:1;
  68 +};
  69 +
  70 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
  71 +                               uint8_t data)
  72 +{
  73 +       uint8_t buf[2];
  74 +       buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
  75 +       buf[1] = data;
  76 +
  77 +       return spi_write(spi, buf, sizeof(buf));
  78 +}
  79 +
  80 +static void ili8960_power_disable(struct spi_device *spi)
  81 +{
  82 +       int ret = ili8960_write_reg(spi, 0x5, 0xc6) ;
  83 +       if (ret < 0)
  84 +               dev_err(&spi->dev, "Failed to disable power: %d\n", ret);
  85 +}
  86 +
  87 +static void ili8960_power_enable(struct spi_device *spi)
  88 +{
  89 +       ili8960_write_reg(spi, 0x5, 0xc7);
  90 +}
  91 +
  92 +
  93 +static int ili8960_set_power(struct lcd_device *lcd, int power)
  94 +{
  95 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
  96 +
  97 +       switch (power) {
  98 +       case FB_BLANK_UNBLANK:
  99 +               mdelay(20);
 100 +               ili8960->enabled = 1;
 101 +               ili8960_power_enable(ili8960->spi);
 102 +               break;
 103 +       default:
 104 +               ili8960->enabled = 0;
 105 +               ili8960_power_disable(ili8960->spi);
 106 +               mdelay(20);
 107 +               break;
 108 +       }
 109 +       return 0;
 110 +}
 111 +
 112 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
 113 +{
 114 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 115 +       ili8960_write_reg(ili8960->spi, 0x0d, contrast);
 116 +       return 0;
 117 +}
 118 +
 119 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 120 +{
 121 +       if (mode->xres != 320 && mode->yres != 240)
 122 +               return -EINVAL;
 123 +
 124 +       return 0;
 125 +}
 126 +
 127 +static ssize_t reg_write(struct device *dev, struct device_attribute *attr,
 128 +                                               const char *buf, size_t count)
 129 +{
 130 +       char *buf2;
 131 +       uint32_t reg = simple_strtoul(buf, &buf2, 10);
 132 +       uint32_t val = simple_strtoul(buf2 + 1, NULL, 10);
 133 +       struct ili8960 *ili8960 = dev_get_drvdata(dev);
 134 +
 135 +       if (reg < 0 || val < 0)
 136 +               return -EINVAL;
 137 +
 138 +       ili8960_write_reg(ili8960->spi, reg, val);
 139 +       return count;
 140 +}
 141 +
 142 +static DEVICE_ATTR(reg, 0644, NULL, reg_write);
 143 +
 144 +static ssize_t ili8960_show_brightness(struct device *dev,
 145 +               struct device_attribute *attr, char *buf)
 146 +{
 147 +       int rc = -ENXIO;
 148 +
 149 +       return rc;
 150 +}
 151 +
 152 +static ssize_t ili8960_store_brightness(struct device *dev,
 153 +               struct device_attribute *attr, const char *buf, size_t count)
 154 +{
 155 +       char *endp;
 156 +       struct lcd_device *ld = to_lcd_device(dev);
 157 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 158 +       int brightness = simple_strtoul(buf, &endp, 0);
 159 +
 160 +       if (brightness > 255 || brightness < 0)
 161 +               return -EINVAL;
 162 +
 163 +       ili8960_write_reg(ili8960->spi, 0x3, brightness);
 164 +
 165 +       return count;
 166 +}
 167 +
 168 +
 169 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
 170 +       ili8960_store_brightness);
 171 +
 172 +static struct lcd_ops ili8960_lcd_ops = {
 173 +       .set_power = ili8960_set_power,
 174 +       .set_contrast = ili8960_set_contrast,
 175 +       .set_mode = ili8960_set_mode,
 176 +};
 177 +
 178 +static int __devinit ili8960_probe(struct spi_device *spi)
 179 +{
 180 +       int ret;
 181 +       struct ili8960 *ili8960;
 182 +
 183 +       ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
 184 +
 185 +       spi->bits_per_word = 8;
 186 +       spi->mode = SPI_MODE_3 | SPI_3WIRE;
 187 +
 188 +       ret = spi_setup(spi);
 189 +       if (ret) {
 190 +               dev_err(&spi->dev, "Failed to setup spi\n");
 191 +               goto err_free_ili8960;
 192 +       }
 193 +
 194 +       ili8960->spi = spi;
 195 +
 196 +       ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
 197 +                                               &ili8960_lcd_ops);
 198 +
 199 +       if (IS_ERR(ili8960->lcd)) {
 200 +               ret = PTR_ERR(ili8960->lcd);
 201 +               dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
 202 +               goto err_free_ili8960;
 203 +       }
 204 +
 205 +       ili8960->lcd->props.max_contrast = 255;
 206 +
 207 +       ret = device_create_file(&spi->dev, &dev_attr_reg);
 208 +       if (ret)
 209 +               goto err_unregister_lcd;
 210 +
 211 +       ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
 212 +       if (ret)
 213 +               goto err_unregister_lcd;
 214 +
 215 +       ili8960->enabled = 1;
 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 +#if 0
 233 +       if (ili8960->bl)
 234 +               backlight_device_unregister(ili8960->bl);
 235 +#endif
 236 +
 237 +       lcd_device_unregister(ili8960->lcd);
 238 +
 239 +       spi_set_drvdata(spi, NULL);
 240 +       kfree(ili8960);
 241 +       return 0;
 242 +}
 243 +
 244 +#ifdef CONFIG_PM
 245 +
 246 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
 247 +{
 248 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 249 +       if (ili8960->enabled) {
 250 +               ili8960_power_disable(spi);
 251 +               mdelay(10);
 252 +       }
 253 +       return 0;
 254 +}
 255 +
 256 +static int ili8960_resume(struct spi_device *spi)
 257 +{
 258 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 259 +       if (ili8960->enabled)
 260 +               ili8960_power_enable(spi);
 261 +       return 0;
 262 +}
 263 +
 264 +#else
 265 +#define ili8960_suspend NULL
 266 +#define ili8960_resume NULL
 267 +#endif
 268 +
 269 +static struct spi_driver ili8960_driver = {
 270 +       .driver = {
 271 +               .name = "ili8960",
 272 +               .owner = THIS_MODULE,
 273 +       },
 274 +       .probe = ili8960_probe,
 275 +       .remove = __devexit_p(ili8960_remove),
 276 +       .suspend = ili8960_suspend,
 277 +       .resume = ili8960_resume,
 278 +};
 279 +
 280 +static int __init ili8960_init(void)
 281 +{
 282 +       return spi_register_driver(&ili8960_driver);
 283 +}
 284 +module_init(ili8960_init);
 285 +
 286 +static void __exit ili8960_exit(void)
 287 +{
 288 +       return spi_unregister_driver(&ili8960_driver);
 289 +}
 290 +module_exit(ili8960_exit)
 291 +
 292 +MODULE_AUTHOR("Lars-Peter Clausen");
 293 +MODULE_LICENSE("GPL v2");
 294 +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
 295 +MODULE_ALIAS("spi:ili8960");