target/linux/xburst/patches-3.10/009-Add-ili8960-lcd-driver.patch

   1 From ee3a5c779be4d1d270388203cd1c6a734a0bf4ed 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 09/16] Add ili8960 lcd driver
   5
   6 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
   7 ---
   8  drivers/video/backlight/Kconfig   |    7 +
   9  drivers/video/backlight/Makefile  |    1 +
  10  drivers/video/backlight/ili8960.c |  262 +++++++++++++++++++++++++++++++++++++
  11  3 files changed, 270 insertions(+)
  12  create mode 100644 drivers/video/backlight/ili8960.c
  13
  14 diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
  15 index d5ab658..7cd68d0 100644
  16 --- a/drivers/video/backlight/Kconfig
  17 +++ b/drivers/video/backlight/Kconfig
  18 @@ -59,6 +59,13 @@ config LCD_LTV350QV
  19
  20           The LTV350QV panel is present on all ATSTK1000 boards.
  21
  22 +config LCD_ILI8960
  23 +       tristate "Ilitek ili8960 LCD driver"
  24 +       depends on LCD_CLASS_DEVICE && SPI
  25 +       default n
  26 +       help
  27 +         Driver for the Ilitek ili8960 LCD controller chip.
  28 +
  29  config LCD_ILI922X
  30         tristate "ILI Technology ILI9221/ILI9222 support"
  31         depends on SPI
  32 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
  33 index 92711fe..81d3e93 100644
  34 --- a/drivers/video/backlight/Makefile
  35 +++ b/drivers/video/backlight/Makefile
  36 @@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_CLASS_DEVICE)          += lcd.o
  37  obj-$(CONFIG_LCD_CORGI)                        += corgi_lcd.o
  38  obj-$(CONFIG_LCD_HP700)                        += jornada720_lcd.o
  39  obj-$(CONFIG_LCD_HX8357)               += hx8357.o
  40 +obj-$(CONFIG_LCD_ILI8960)              += ili8960.o
  41  obj-$(CONFIG_LCD_ILI922X)              += ili922x.o
  42  obj-$(CONFIG_LCD_ILI9320)              += ili9320.o
  43  obj-$(CONFIG_LCD_L4F00242T03)          += l4f00242t03.o
  44 diff --git a/drivers/video/backlight/ili8960.c b/drivers/video/backlight/ili8960.c
  45 new file mode 100644
  46 index 0000000..61eb815
  47 --- /dev/null
  48 +++ b/drivers/video/backlight/ili8960.c
  49 @@ -0,0 +1,262 @@
  50 +/*
  51 + *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  52 + *  Driver for Ilitek ili8960 LCD
  53 + *
  54 + *  This program is free software; you can redistribute         it and/or modify it
  55 + *  under  the terms of         the GNU General  Public License as published by the
  56 + *  Free Software Foundation;  either version 2 of the License, or (at your
  57 + *  option) any later version.
  58 + *
  59 + *  You should have received a copy of the  GNU General Public License along
  60 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  61 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  62 + *
  63 + */
  64 +
  65 +#include <linux/module.h>
  66 +#include <linux/spi/spi.h>
  67 +#include <linux/lcd.h>
  68 +#include <linux/delay.h>
  69 +
  70 +struct ili8960 {
  71 +       struct spi_device *spi;
  72 +       struct lcd_device *lcd;
  73 +       bool enabled;
  74 +       unsigned int brightness;
  75 +};
  76 +
  77 +#define ILI8960_REG_BRIGHTNESS 0x03
  78 +#define ILI8960_REG_POWER      0x05
  79 +#define ILI8960_REG_CONTRAST   0x0d
  80 +
  81 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
  82 +                               uint8_t data)
  83 +{
  84 +       uint8_t buf[2];
  85 +       buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
  86 +       buf[1] = data;
  87 +
  88 +       return spi_write(spi, buf, sizeof(buf));
  89 +}
  90 +
  91 +static int ili8960_programm_power(struct spi_device *spi, bool enabled)
  92 +{
  93 +       int ret;
  94 +
  95 +       if (enabled)
  96 +               mdelay(20);
  97 +
  98 +       ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
  99 +
 100 +       if (!enabled)
 101 +               mdelay(20);
 102 +
 103 +       return ret;
 104 +}
 105 +
 106 +static int ili8960_set_power(struct lcd_device *lcd, int power)
 107 +{
 108 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 109 +
 110 +       switch (power) {
 111 +       case FB_BLANK_UNBLANK:
 112 +               ili8960->enabled = true;
 113 +               break;
 114 +       default:
 115 +               return 0;
 116 +       }
 117 +
 118 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 119 +}
 120 +
 121 +static int ili8960_early_set_power(struct lcd_device *lcd, int power)
 122 +{
 123 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 124 +
 125 +       switch (power) {
 126 +       case FB_BLANK_UNBLANK:
 127 +               return 0;
 128 +       default:
 129 +               ili8960->enabled = false;
 130 +               break;
 131 +       }
 132 +
 133 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 134 +}
 135 +
 136 +static int ili8960_get_power(struct lcd_device *lcd)
 137 +{
 138 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 139 +       return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 140 +}
 141 +
 142 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
 143 +{
 144 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 145 +
 146 +       return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
 147 +}
 148 +
 149 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 150 +{
 151 +       if (mode->xres != 320 && mode->yres != 240)
 152 +               return -EINVAL;
 153 +
 154 +       return 0;
 155 +}
 156 +
 157 +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
 158 +{
 159 +       int ret;
 160 +
 161 +       ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
 162 +
 163 +       if (ret == 0)
 164 +               ili8960->brightness = brightness;
 165 +
 166 +       return ret;
 167 +}
 168 +
 169 +static ssize_t ili8960_show_brightness(struct device *dev,
 170 +               struct device_attribute *attr, char *buf)
 171 +{
 172 +       struct lcd_device *ld = to_lcd_device(dev);
 173 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 174 +
 175 +       return sprintf(buf, "%u\n", ili8960->brightness);
 176 +}
 177 +
 178 +static ssize_t ili8960_store_brightness(struct device *dev,
 179 +               struct device_attribute *attr, const char *buf, size_t count)
 180 +{
 181 +       struct lcd_device *ld = to_lcd_device(dev);
 182 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 183 +       unsigned long brightness;
 184 +       int ret;
 185 +
 186 +       ret = kstrtoul(buf, 0, &brightness);
 187 +       if (ret)
 188 +               return ret;
 189 +
 190 +       if (brightness > 255)
 191 +               return -EINVAL;
 192 +
 193 +       ili8960_set_brightness(ili8960, brightness);
 194 +
 195 +       return count;
 196 +}
 197 +
 198 +
 199 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
 200 +       ili8960_store_brightness);
 201 +
 202 +static struct lcd_ops ili8960_lcd_ops = {
 203 +       .set_power = ili8960_set_power,
 204 +       .early_set_power = ili8960_early_set_power,
 205 +       .get_power = ili8960_get_power,
 206 +       .set_contrast = ili8960_set_contrast,
 207 +       .set_mode = ili8960_set_mode,
 208 +};
 209 +
 210 +static int ili8960_probe(struct spi_device *spi)
 211 +{
 212 +       int ret;
 213 +       struct ili8960 *ili8960;
 214 +
 215 +       ili8960 = devm_kzalloc(&spi->dev, sizeof(*ili8960), GFP_KERNEL);
 216 +       if (!ili8960)
 217 +               return -ENOMEM;
 218 +
 219 +       spi->bits_per_word = 8;
 220 +       spi->mode = SPI_MODE_3;
 221 +
 222 +       ret = spi_setup(spi);
 223 +       if (ret) {
 224 +               dev_err(&spi->dev, "Failed to setup spi\n");
 225 +               return ret;
 226 +       }
 227 +
 228 +       ili8960->spi = spi;
 229 +
 230 +       ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
 231 +                                               &ili8960_lcd_ops);
 232 +
 233 +       if (IS_ERR(ili8960->lcd)) {
 234 +               ret = PTR_ERR(ili8960->lcd);
 235 +               dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
 236 +               return ret;
 237 +       }
 238 +
 239 +       ili8960->lcd->props.max_contrast = 255;
 240 +
 241 +       ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
 242 +       if (ret)
 243 +               goto err_unregister_lcd;
 244 +
 245 +       ili8960_programm_power(ili8960->spi, true);
 246 +       ili8960->enabled = true;
 247 +
 248 +       spi_set_drvdata(spi, ili8960);
 249 +
 250 +       ili8960_write_reg(spi, 0x13, 0x01);
 251 +
 252 +       return 0;
 253 +err_unregister_lcd:
 254 +       lcd_device_unregister(ili8960->lcd);
 255 +       return ret;
 256 +}
 257 +
 258 +static int ili8960_remove(struct spi_device *spi)
 259 +{
 260 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 261 +
 262 +       device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
 263 +       lcd_device_unregister(ili8960->lcd);
 264 +
 265 +       spi_set_drvdata(spi, NULL);
 266 +       return 0;
 267 +}
 268 +
 269 +#ifdef CONFIG_PM
 270 +
 271 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
 272 +{
 273 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 274 +
 275 +       if (ili8960->enabled)
 276 +               ili8960_programm_power(ili8960->spi, false);
 277 +
 278 +       return 0;
 279 +}
 280 +
 281 +static int ili8960_resume(struct spi_device *spi)
 282 +{
 283 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 284 +
 285 +       if (ili8960->enabled)
 286 +               ili8960_programm_power(ili8960->spi, true);
 287 +
 288 +       return 0;
 289 +}
 290 +
 291 +#else
 292 +#define ili8960_suspend NULL
 293 +#define ili8960_resume NULL
 294 +#endif
 295 +
 296 +static struct spi_driver ili8960_driver = {
 297 +       .driver = {
 298 +               .name = "ili8960",
 299 +               .owner = THIS_MODULE,
 300 +       },
 301 +       .probe = ili8960_probe,
 302 +       .remove = ili8960_remove,
 303 +       .suspend = ili8960_suspend,
 304 +       .resume = ili8960_resume,
 305 +};
 306 +module_spi_driver(ili8960_driver);
 307 +
 308 +MODULE_AUTHOR("Lars-Peter Clausen");
 309 +MODULE_LICENSE("GPL");
 310 +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
 311 +MODULE_ALIAS("spi:ili8960");
 312 --
 313 1.7.10.4
 314