target/linux/xburst/patches-3.2/0007-Add-ili8960-lcd-driver.patch

   1 From 2248fb9c47fe7e72c735d6c16aba27bf92e1673a 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 07/21] 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 diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
  14 index 278aeaa..f617883 100644
  15 --- a/drivers/video/backlight/Kconfig
  16 +++ b/drivers/video/backlight/Kconfig
  17 @@ -59,6 +59,13 @@ config LCD_LTV350QV
  18
  19           The LTV350QV panel is present on all ATSTK1000 boards.
  20
  21 +config LCD_ILI8960
  22 +       tristate "Ilitek ili8960 LCD driver"
  23 +       depends on LCD_CLASS_DEVICE && SPI
  24 +       default n
  25 +       help
  26 +         Driver for the Ilitek ili8960 LCD controller chip.
  27 +
  28  config LCD_ILI9320
  29         tristate
  30         help
  31 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
  32 index fdd1fc4..01ec378 100644
  33 --- a/drivers/video/backlight/Makefile
  34 +++ b/drivers/video/backlight/Makefile
  35 @@ -6,6 +6,7 @@ obj-$(CONFIG_LCD_HP700)            += jornada720_lcd.o
  36  obj-$(CONFIG_LCD_L4F00242T03)     += l4f00242t03.o
  37  obj-$(CONFIG_LCD_LMS283GF05)      += lms283gf05.o
  38  obj-$(CONFIG_LCD_LTV350QV)        += ltv350qv.o
  39 +obj-$(CONFIG_LCD_ILI8960)         += ili8960.o
  40  obj-$(CONFIG_LCD_ILI9320)         += ili9320.o
  41  obj-$(CONFIG_LCD_PLATFORM)        += platform_lcd.o
  42  obj-$(CONFIG_LCD_VGG2432A4)       += vgg2432a4.o
  43 diff --git a/drivers/video/backlight/ili8960.c b/drivers/video/backlight/ili8960.c
  44 new file mode 100644
  45 index 0000000..1438e92
  46 --- /dev/null
  47 +++ b/drivers/video/backlight/ili8960.c
  48 @@ -0,0 +1,263 @@
  49 +/*
  50 + *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  51 + *  Driver for Ilitek ili8960 LCD
  52 + *
  53 + *  This program is free software; you can redistribute         it and/or modify it
  54 + *  under  the terms of         the GNU General  Public License as published by the
  55 + *  Free Software Foundation;  either version 2 of the License, or (at your
  56 + *  option) any later version.
  57 + *
  58 + *  You should have received a copy of the  GNU General Public License along
  59 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  60 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  61 + *
  62 + */
  63 +
  64 +#include <linux/module.h>
  65 +#include <linux/spi/spi.h>
  66 +#include <linux/lcd.h>
  67 +#include <linux/backlight.h>
  68 +#include <linux/delay.h>
  69 +
  70 +struct ili8960 {
  71 +       struct spi_device *spi;
  72 +       struct lcd_device *lcd;
  73 +       struct backlight_device *bl;
  74 +       bool enabled;
  75 +       unsigned int brightness;
  76 +};
  77 +
  78 +#define ILI8960_REG_BRIGHTNESS 0x03
  79 +#define ILI8960_REG_POWER      0x05
  80 +#define ILI8960_REG_CONTRAST   0x0d
  81 +
  82 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
  83 +                               uint8_t data)
  84 +{
  85 +       uint8_t buf[2];
  86 +       buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
  87 +       buf[1] = data;
  88 +
  89 +       return spi_write(spi, buf, sizeof(buf));
  90 +}
  91 +
  92 +static int ili8960_programm_power(struct spi_device *spi, bool enabled)
  93 +{
  94 +       int ret;
  95 +
  96 +       if (enabled)
  97 +               mdelay(20);
  98 +
  99 +       ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
 100 +
 101 +       if (!enabled)
 102 +               mdelay(20);
 103 +
 104 +       return ret;
 105 +}
 106 +
 107 +static int ili8960_set_power(struct lcd_device *lcd, int power)
 108 +{
 109 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 110 +
 111 +       switch (power) {
 112 +       case FB_BLANK_UNBLANK:
 113 +               ili8960->enabled = true;
 114 +               break;
 115 +       default:
 116 +               ili8960->enabled = false;
 117 +               break;
 118 +       }
 119 +
 120 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 121 +}
 122 +
 123 +static int ili8960_get_power(struct lcd_device *lcd)
 124 +{
 125 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 126 +       return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 127 +}
 128 +
 129 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
 130 +{
 131 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 132 +
 133 +       return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
 134 +}
 135 +
 136 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 137 +{
 138 +       if (mode->xres != 320 && mode->yres != 240)
 139 +               return -EINVAL;
 140 +
 141 +       return 0;
 142 +}
 143 +
 144 +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
 145 +{
 146 +       int ret;
 147 +
 148 +       ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
 149 +
 150 +       if (ret == 0)
 151 +               ili8960->brightness = brightness;
 152 +
 153 +       return ret;
 154 +}
 155 +
 156 +static ssize_t ili8960_show_brightness(struct device *dev,
 157 +               struct device_attribute *attr, char *buf)
 158 +{
 159 +       struct lcd_device *ld = to_lcd_device(dev);
 160 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 161 +
 162 +       return sprintf(buf, "%u\n", ili8960->brightness);
 163 +}
 164 +
 165 +static ssize_t ili8960_store_brightness(struct device *dev,
 166 +               struct device_attribute *attr, const char *buf, size_t count)
 167 +{
 168 +       struct lcd_device *ld = to_lcd_device(dev);
 169 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 170 +       unsigned long brightness;
 171 +       int ret;
 172 +
 173 +       ret = strict_strtoul(buf, 0, &brightness);
 174 +       if (ret)
 175 +               return ret;
 176 +
 177 +       if (brightness > 255)
 178 +               return -EINVAL;
 179 +
 180 +       ili8960_set_brightness(ili8960, brightness);
 181 +
 182 +       return count;
 183 +}
 184 +
 185 +
 186 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
 187 +       ili8960_store_brightness);
 188 +
 189 +static struct lcd_ops ili8960_lcd_ops = {
 190 +       .set_power = ili8960_set_power,
 191 +       .get_power = ili8960_get_power,
 192 +       .set_contrast = ili8960_set_contrast,
 193 +       .set_mode = ili8960_set_mode,
 194 +};
 195 +
 196 +static int __devinit ili8960_probe(struct spi_device *spi)
 197 +{
 198 +       int ret;
 199 +       struct ili8960 *ili8960;
 200 +
 201 +       ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
 202 +       if (!ili8960)
 203 +               return -ENOMEM;
 204 +
 205 +       spi->bits_per_word = 8;
 206 +       spi->mode = SPI_MODE_3;
 207 +
 208 +       ret = spi_setup(spi);
 209 +       if (ret) {
 210 +               dev_err(&spi->dev, "Failed to setup spi\n");
 211 +               goto err_free_ili8960;
 212 +       }
 213 +
 214 +       ili8960->spi = spi;
 215 +
 216 +       ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
 217 +                                               &ili8960_lcd_ops);
 218 +
 219 +       if (IS_ERR(ili8960->lcd)) {
 220 +               ret = PTR_ERR(ili8960->lcd);
 221 +               dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
 222 +               goto err_free_ili8960;
 223 +       }
 224 +
 225 +       ili8960->lcd->props.max_contrast = 255;
 226 +
 227 +       ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
 228 +       if (ret)
 229 +               goto err_unregister_lcd;
 230 +
 231 +       ili8960_programm_power(ili8960->spi, true);
 232 +       ili8960->enabled = true;
 233 +
 234 +       spi_set_drvdata(spi, ili8960);
 235 +
 236 +       ili8960_write_reg(spi, 0x13, 0x01);
 237 +
 238 +       return 0;
 239 +err_unregister_lcd:
 240 +       lcd_device_unregister(ili8960->lcd);
 241 +err_free_ili8960:
 242 +       kfree(ili8960);
 243 +       return ret;
 244 +}
 245 +
 246 +static int __devexit ili8960_remove(struct spi_device *spi)
 247 +{
 248 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 249 +
 250 +       device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
 251 +       lcd_device_unregister(ili8960->lcd);
 252 +
 253 +       spi_set_drvdata(spi, NULL);
 254 +       kfree(ili8960);
 255 +       return 0;
 256 +}
 257 +
 258 +#ifdef CONFIG_PM
 259 +
 260 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
 261 +{
 262 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 263 +
 264 +       if (ili8960->enabled)
 265 +               ili8960_programm_power(ili8960->spi, false);
 266 +
 267 +       return 0;
 268 +}
 269 +
 270 +static int ili8960_resume(struct spi_device *spi)
 271 +{
 272 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 273 +
 274 +       if (ili8960->enabled)
 275 +               ili8960_programm_power(ili8960->spi, true);
 276 +
 277 +       return 0;
 278 +}
 279 +
 280 +#else
 281 +#define ili8960_suspend NULL
 282 +#define ili8960_resume NULL
 283 +#endif
 284 +
 285 +static struct spi_driver ili8960_driver = {
 286 +       .driver = {
 287 +               .name = "ili8960",
 288 +               .owner = THIS_MODULE,
 289 +       },
 290 +       .probe = ili8960_probe,
 291 +       .remove = __devexit_p(ili8960_remove),
 292 +       .suspend = ili8960_suspend,
 293 +       .resume = ili8960_resume,
 294 +};
 295 +
 296 +static int __init ili8960_init(void)
 297 +{
 298 +       return spi_register_driver(&ili8960_driver);
 299 +}
 300 +module_init(ili8960_init);
 301 +
 302 +static void __exit ili8960_exit(void)
 303 +{
 304 +       spi_unregister_driver(&ili8960_driver);
 305 +}
 306 +module_exit(ili8960_exit)
 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 1.7.5.4
 314