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