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