target/linux/xburst/patches-3.18/006-Add-ili8960-lcd-driver.patch

   1 From 8741ead92bc93e66740237e51b88b8690ebcbba3 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 6/7] Add ili8960 lcd driver
   5
   6 Includes the following changes from the jz-3.5 branch:
   7 - Use module_spi_driver
   8 - Use devm_kzalloc
   9 - Use kstrtoul
  10
  11 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
  12 ---
  13  drivers/video/backlight/Kconfig   |    7 +
  14  drivers/video/backlight/Makefile  |    1 +
  15  drivers/video/backlight/ili8960.c |  262 +++++++++++++++++++++++++++++++++++++
  16  3 files changed, 270 insertions(+)
  17  create mode 100644 drivers/video/backlight/ili8960.c
  18
  19 diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
  20 index 8d03924..14adcc6 100644
  21 --- a/drivers/video/backlight/Kconfig
  22 +++ b/drivers/video/backlight/Kconfig
  23 @@ -59,6 +59,13 @@ config LCD_LTV350QV
  24
  25           The LTV350QV panel is present on all ATSTK1000 boards.
  26
  27 +config LCD_ILI8960
  28 +       tristate "Ilitek ili8960 LCD driver"
  29 +       depends on LCD_CLASS_DEVICE && SPI
  30 +       default n
  31 +       help
  32 +         Driver for the Ilitek ili8960 LCD controller chip.
  33 +
  34  config LCD_ILI922X
  35         tristate "ILI Technology ILI9221/ILI9222 support"
  36         depends on SPI
  37 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
  38 index fcd50b73..1f89974 100644
  39 --- a/drivers/video/backlight/Makefile
  40 +++ b/drivers/video/backlight/Makefile
  41 @@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_CLASS_DEVICE)          += lcd.o
  42  obj-$(CONFIG_LCD_CORGI)                        += corgi_lcd.o
  43  obj-$(CONFIG_LCD_HP700)                        += jornada720_lcd.o
  44  obj-$(CONFIG_LCD_HX8357)               += hx8357.o
  45 +obj-$(CONFIG_LCD_ILI8960)              += ili8960.o
  46  obj-$(CONFIG_LCD_ILI922X)              += ili922x.o
  47  obj-$(CONFIG_LCD_ILI9320)              += ili9320.o
  48  obj-$(CONFIG_LCD_L4F00242T03)          += l4f00242t03.o
  49 diff --git a/drivers/video/backlight/ili8960.c b/drivers/video/backlight/ili8960.c
  50 new file mode 100644
  51 index 0000000..61eb815
  52 --- /dev/null
  53 +++ b/drivers/video/backlight/ili8960.c
  54 @@ -0,0 +1,262 @@
  55 +/*
  56 + *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  57 + *  Driver for Ilitek ili8960 LCD
  58 + *
  59 + *  This program is free software; you can redistribute         it and/or modify it
  60 + *  under  the terms of         the GNU General  Public License as published by the
  61 + *  Free Software Foundation;  either version 2 of the License, or (at your
  62 + *  option) any later version.
  63 + *
  64 + *  You should have received a copy of the  GNU General Public License along
  65 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  66 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  67 + *
  68 + */
  69 +
  70 +#include <linux/module.h>
  71 +#include <linux/spi/spi.h>
  72 +#include <linux/lcd.h>
  73 +#include <linux/delay.h>
  74 +
  75 +struct ili8960 {
  76 +       struct spi_device *spi;
  77 +       struct lcd_device *lcd;
  78 +       bool enabled;
  79 +       unsigned int brightness;
  80 +};
  81 +
  82 +#define ILI8960_REG_BRIGHTNESS 0x03
  83 +#define ILI8960_REG_POWER      0x05
  84 +#define ILI8960_REG_CONTRAST   0x0d
  85 +
  86 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
  87 +                               uint8_t data)
  88 +{
  89 +       uint8_t buf[2];
  90 +       buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
  91 +       buf[1] = data;
  92 +
  93 +       return spi_write(spi, buf, sizeof(buf));
  94 +}
  95 +
  96 +static int ili8960_programm_power(struct spi_device *spi, bool enabled)
  97 +{
  98 +       int ret;
  99 +
 100 +       if (enabled)
 101 +               mdelay(20);
 102 +
 103 +       ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
 104 +
 105 +       if (!enabled)
 106 +               mdelay(20);
 107 +
 108 +       return ret;
 109 +}
 110 +
 111 +static int ili8960_set_power(struct lcd_device *lcd, int power)
 112 +{
 113 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 114 +
 115 +       switch (power) {
 116 +       case FB_BLANK_UNBLANK:
 117 +               ili8960->enabled = true;
 118 +               break;
 119 +       default:
 120 +               return 0;
 121 +       }
 122 +
 123 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 124 +}
 125 +
 126 +static int ili8960_early_set_power(struct lcd_device *lcd, int power)
 127 +{
 128 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 129 +
 130 +       switch (power) {
 131 +       case FB_BLANK_UNBLANK:
 132 +               return 0;
 133 +       default:
 134 +               ili8960->enabled = false;
 135 +               break;
 136 +       }
 137 +
 138 +       return ili8960_programm_power(ili8960->spi, ili8960->enabled);
 139 +}
 140 +
 141 +static int ili8960_get_power(struct lcd_device *lcd)
 142 +{
 143 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 144 +       return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 145 +}
 146 +
 147 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
 148 +{
 149 +       struct ili8960 *ili8960 = lcd_get_data(lcd);
 150 +
 151 +       return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
 152 +}
 153 +
 154 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 155 +{
 156 +       if (mode->xres != 320 && mode->yres != 240)
 157 +               return -EINVAL;
 158 +
 159 +       return 0;
 160 +}
 161 +
 162 +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
 163 +{
 164 +       int ret;
 165 +
 166 +       ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
 167 +
 168 +       if (ret == 0)
 169 +               ili8960->brightness = brightness;
 170 +
 171 +       return ret;
 172 +}
 173 +
 174 +static ssize_t ili8960_show_brightness(struct device *dev,
 175 +               struct device_attribute *attr, char *buf)
 176 +{
 177 +       struct lcd_device *ld = to_lcd_device(dev);
 178 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 179 +
 180 +       return sprintf(buf, "%u\n", ili8960->brightness);
 181 +}
 182 +
 183 +static ssize_t ili8960_store_brightness(struct device *dev,
 184 +               struct device_attribute *attr, const char *buf, size_t count)
 185 +{
 186 +       struct lcd_device *ld = to_lcd_device(dev);
 187 +       struct ili8960 *ili8960 = lcd_get_data(ld);
 188 +       unsigned long brightness;
 189 +       int ret;
 190 +
 191 +       ret = kstrtoul(buf, 0, &brightness);
 192 +       if (ret)
 193 +               return ret;
 194 +
 195 +       if (brightness > 255)
 196 +               return -EINVAL;
 197 +
 198 +       ili8960_set_brightness(ili8960, brightness);
 199 +
 200 +       return count;
 201 +}
 202 +
 203 +
 204 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
 205 +       ili8960_store_brightness);
 206 +
 207 +static struct lcd_ops ili8960_lcd_ops = {
 208 +       .set_power = ili8960_set_power,
 209 +       .early_set_power = ili8960_early_set_power,
 210 +       .get_power = ili8960_get_power,
 211 +       .set_contrast = ili8960_set_contrast,
 212 +       .set_mode = ili8960_set_mode,
 213 +};
 214 +
 215 +static int ili8960_probe(struct spi_device *spi)
 216 +{
 217 +       int ret;
 218 +       struct ili8960 *ili8960;
 219 +
 220 +       ili8960 = devm_kzalloc(&spi->dev, sizeof(*ili8960), GFP_KERNEL);
 221 +       if (!ili8960)
 222 +               return -ENOMEM;
 223 +
 224 +       spi->bits_per_word = 8;
 225 +       spi->mode = SPI_MODE_3;
 226 +
 227 +       ret = spi_setup(spi);
 228 +       if (ret) {
 229 +               dev_err(&spi->dev, "Failed to setup spi\n");
 230 +               return ret;
 231 +       }
 232 +
 233 +       ili8960->spi = spi;
 234 +
 235 +       ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
 236 +                                               &ili8960_lcd_ops);
 237 +
 238 +       if (IS_ERR(ili8960->lcd)) {
 239 +               ret = PTR_ERR(ili8960->lcd);
 240 +               dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
 241 +               return ret;
 242 +       }
 243 +
 244 +       ili8960->lcd->props.max_contrast = 255;
 245 +
 246 +       ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
 247 +       if (ret)
 248 +               goto err_unregister_lcd;
 249 +
 250 +       ili8960_programm_power(ili8960->spi, true);
 251 +       ili8960->enabled = true;
 252 +
 253 +       spi_set_drvdata(spi, ili8960);
 254 +
 255 +       ili8960_write_reg(spi, 0x13, 0x01);
 256 +
 257 +       return 0;
 258 +err_unregister_lcd:
 259 +       lcd_device_unregister(ili8960->lcd);
 260 +       return ret;
 261 +}
 262 +
 263 +static int ili8960_remove(struct spi_device *spi)
 264 +{
 265 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 266 +
 267 +       device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
 268 +       lcd_device_unregister(ili8960->lcd);
 269 +
 270 +       spi_set_drvdata(spi, NULL);
 271 +       return 0;
 272 +}
 273 +
 274 +#ifdef CONFIG_PM
 275 +
 276 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
 277 +{
 278 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 279 +
 280 +       if (ili8960->enabled)
 281 +               ili8960_programm_power(ili8960->spi, false);
 282 +
 283 +       return 0;
 284 +}
 285 +
 286 +static int ili8960_resume(struct spi_device *spi)
 287 +{
 288 +       struct ili8960 *ili8960 = spi_get_drvdata(spi);
 289 +
 290 +       if (ili8960->enabled)
 291 +               ili8960_programm_power(ili8960->spi, true);
 292 +
 293 +       return 0;
 294 +}
 295 +
 296 +#else
 297 +#define ili8960_suspend NULL
 298 +#define ili8960_resume NULL
 299 +#endif
 300 +
 301 +static struct spi_driver ili8960_driver = {
 302 +       .driver = {
 303 +               .name = "ili8960",
 304 +               .owner = THIS_MODULE,
 305 +       },
 306 +       .probe = ili8960_probe,
 307 +       .remove = ili8960_remove,
 308 +       .suspend = ili8960_suspend,
 309 +       .resume = ili8960_resume,
 310 +};
 311 +module_spi_driver(ili8960_driver);
 312 +
 313 +MODULE_AUTHOR("Lars-Peter Clausen");
 314 +MODULE_LICENSE("GPL");
 315 +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
 316 +MODULE_ALIAS("spi:ili8960");
 317 --
 318 1.7.10.4
 319