target/linux/s3c24xx/patches-2.6.24/1017-gta01-backlight.patch.patch

   1 From e6e1c20bc96cc397812ab07f0ccd0a16360f2e24 Mon Sep 17 00:00:00 2001
   2 From: mokopatches <mokopatches@openmoko.org>
   3 Date: Fri, 4 Apr 2008 11:32:08 +0100
   4 Subject: [PATCH] gta01-backlight.patch
   5  This is a backlight driver for the FIC/OpenMoko Neo1973 GTA01 GSM Phone
   6
   7 Signed-off-by: Harald Welte <laforge@openmoko.org>
   8 ---
   9  drivers/video/backlight/Kconfig    |    8 +
  10  drivers/video/backlight/Makefile   |    1 +
  11  drivers/video/backlight/gta01_bl.c |  255 ++++++++++++++++++++++++++++++++++++
  12  3 files changed, 264 insertions(+), 0 deletions(-)
  13  create mode 100644 drivers/video/backlight/gta01_bl.c
  14
  15 diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
  16 index 9609a6c..b954d15 100644
  17 --- a/drivers/video/backlight/Kconfig
  18 +++ b/drivers/video/backlight/Kconfig
  19 @@ -67,6 +67,14 @@ config BACKLIGHT_LOCOMO
  20           If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to
  21           enable the LCD/backlight driver.
  22
  23 +config BACKLIGHT_GTA01
  24 +       tristate "FIC Neo1973 GTA01 Backlight Driver"
  25 +       depends on BACKLIGHT_CLASS_DEVICE && MACH_NEO1973_GTA01
  26 +       default y
  27 +       help
  28 +         If you have a FIC Neo1973 GTA01, say y to enable the backlight driver.
  29 +
  30 +
  31  config BACKLIGHT_HP680
  32         tristate "HP Jornada 680 Backlight Driver"
  33         depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX
  34 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
  35 index 965a78b..8b489f2 100644
  36 --- a/drivers/video/backlight/Makefile
  37 +++ b/drivers/video/backlight/Makefile
  38 @@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_LTV350QV)      += ltv350qv.o
  39
  40  obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
  41  obj-$(CONFIG_BACKLIGHT_CORGI)  += corgi_bl.o
  42 +obj-$(CONFIG_BACKLIGHT_GTA01)  += gta01_bl.o
  43  obj-$(CONFIG_BACKLIGHT_HP680)  += hp680_bl.o
  44  obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
  45  obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
  46 diff --git a/drivers/video/backlight/gta01_bl.c b/drivers/video/backlight/gta01_bl.c
  47 new file mode 100644
  48 index 0000000..c2bf0c9
  49 --- /dev/null
  50 +++ b/drivers/video/backlight/gta01_bl.c
  51 @@ -0,0 +1,255 @@
  52 +/*
  53 + *  Backlight Driver for FIC GTA01 (Neo1973) GSM Phone
  54 + *
  55 + * Copyright (C) 2006-2007 by OpenMoko, Inc.
  56 + * Author: Harald Welte <laforge@openmoko.org>
  57 + * All rights reserved.
  58 + *
  59 + *  based on corgi_cl.c, Copyright (c) 2004-2006 Richard Purdie
  60 + *
  61 + * This program is free software; you can redistribute it and/or
  62 + * modify it under the terms of the GNU General Public License as
  63 + * published by the Free Software Foundation, version 2.
  64 + *
  65 + * This program is distributed in the hope that it will be useful,
  66 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  67 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  68 + * GNU General Public License for more details.
  69 + *
  70 + * You should have received a copy of the GNU General Public License
  71 + * along with this program; if not, write to the Free Software
  72 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  73 + * MA 02111-1307 USA
  74 + *
  75 + * Javi Roman <javiroman@kernel-labs.org>:
  76 + *     implement PWM, instead of simple on/off switching
  77 + *
  78 + */
  79 +
  80 +#include <linux/module.h>
  81 +#include <linux/kernel.h>
  82 +#include <linux/init.h>
  83 +#include <linux/platform_device.h>
  84 +#include <linux/mutex.h>
  85 +#include <linux/fb.h>
  86 +#include <linux/backlight.h>
  87 +#include <linux/clk.h>
  88 +
  89 +#include <asm/arch/hardware.h>
  90 +#include <asm/arch/gta01.h>
  91 +#include <asm/arch/pwm.h>
  92 +
  93 +#include <asm/plat-s3c/regs-timer.h>
  94 +
  95 +static struct backlight_properties gta01bl_prop;
  96 +static struct backlight_device *gta01_backlight_device;
  97 +static struct gta01bl_machinfo *bl_machinfo;
  98 +
  99 +static unsigned long gta01bl_flags;
 100 +
 101 +struct gta01bl_data {
 102 +       int intensity;
 103 +       struct mutex mutex;
 104 +       struct clk *clk;
 105 +       struct s3c2410_pwm pwm;
 106 +};
 107 +
 108 +static struct gta01bl_data gta01bl;
 109 +
 110 +#define GTA01BL_SUSPENDED     0x01
 111 +#define GTA01BL_BATTLOW       0x02
 112 +
 113 +/* On the GTA01 / Neo1973, we use a 50 or 66MHz PCLK, which gives
 114 + * us a 6.25..8.25MHz DIV8 clock, which is further divided by a
 115 + * prescaler of 4, resulting in a 1.56..2.06MHz tick.  This results in a
 116 + * minimum frequency of 24..31Hz.  At 400Hz, we need to set the count
 117 + * to something like 3906..5156, providing us a way sufficient resolution
 118 + * for display brightness adjustment. */
 119 +#define GTA01BL_COUNTER 5156
 120 +
 121 +static int gta01bl_send_intensity(struct backlight_device *bd)
 122 +{
 123 +       int intensity = bd->props.brightness;
 124 +
 125 +       if (bd->props.power != FB_BLANK_UNBLANK)
 126 +               intensity = 0;
 127 +       if (bd->props.fb_blank != FB_BLANK_UNBLANK)
 128 +               intensity = 0;
 129 +       if (gta01bl_flags & GTA01BL_SUSPENDED)
 130 +               intensity = 0;
 131 +       if (gta01bl_flags & GTA01BL_BATTLOW)
 132 +               intensity &= bl_machinfo->limit_mask;
 133 +
 134 +       mutex_lock(&gta01bl.mutex);
 135 +#ifdef GTA01_BACKLIGHT_ONOFF_ONLY
 136 +       if (intensity)
 137 +               s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
 138 +       else
 139 +               s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 0);
 140 +#else
 141 +       if (intensity == bd->props.max_brightness) {
 142 +               s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
 143 +               s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
 144 +       } else  {
 145 +               s3c2410_pwm_duty_cycle(intensity & 0xffff, &gta01bl.pwm);
 146 +               s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPB0_TOUT0);
 147 +       }
 148 +#endif
 149 +       mutex_unlock(&gta01bl.mutex);
 150 +
 151 +       gta01bl.intensity = intensity;
 152 +       return 0;
 153 +}
 154 +
 155 +static int gta01bl_init_hw(void)
 156 +{
 157 +       int rc;
 158 +
 159 +       rc = s3c2410_pwm_init(&gta01bl.pwm);
 160 +       if (rc)
 161 +               return rc;
 162 +
 163 +       gta01bl.pwm.timerid = PWM0;
 164 +       gta01bl.pwm.prescaler = (4 - 1);
 165 +       gta01bl.pwm.divider = S3C2410_TCFG1_MUX0_DIV8;
 166 +       gta01bl.pwm.counter = GTA01BL_COUNTER;
 167 +       gta01bl.pwm.comparer = gta01bl.pwm.counter;
 168 +
 169 +       rc = s3c2410_pwm_enable(&gta01bl.pwm);
 170 +       if (rc)
 171 +               return rc;
 172 +
 173 +       s3c2410_pwm_start(&gta01bl.pwm);
 174 +
 175 +       gta01bl_prop.max_brightness = gta01bl.pwm.counter;
 176 +
 177 +       return 0;
 178 +}
 179 +
 180 +#ifdef CONFIG_PM
 181 +static int gta01bl_suspend(struct platform_device *dev, pm_message_t state)
 182 +{
 183 +       gta01bl_flags |= GTA01BL_SUSPENDED;
 184 +       gta01bl_send_intensity(gta01_backlight_device);
 185 +       return 0;
 186 +}
 187 +
 188 +static int gta01bl_resume(struct platform_device *dev)
 189 +{
 190 +       mutex_lock(&gta01bl.mutex);
 191 +       gta01bl_init_hw();
 192 +       mutex_unlock(&gta01bl.mutex);
 193 +
 194 +       gta01bl_flags &= ~GTA01BL_SUSPENDED;
 195 +       gta01bl_send_intensity(gta01_backlight_device);
 196 +       return 0;
 197 +}
 198 +#else
 199 +#define gta01bl_suspend        NULL
 200 +#define gta01bl_resume NULL
 201 +#endif
 202 +
 203 +static int gta01bl_get_intensity(struct backlight_device *bd)
 204 +{
 205 +       return gta01bl.intensity;
 206 +}
 207 +
 208 +static int gta01bl_set_intensity(struct backlight_device *bd)
 209 +{
 210 +       gta01bl_send_intensity(gta01_backlight_device);
 211 +       return 0;
 212 +}
 213 +
 214 +/*
 215 + * Called when the battery is low to limit the backlight intensity.
 216 + * If limit==0 clear any limit, otherwise limit the intensity
 217 + */
 218 +void gta01bl_limit_intensity(int limit)
 219 +{
 220 +       if (limit)
 221 +               gta01bl_flags |= GTA01BL_BATTLOW;
 222 +       else
 223 +               gta01bl_flags &= ~GTA01BL_BATTLOW;
 224 +       gta01bl_send_intensity(gta01_backlight_device);
 225 +}
 226 +EXPORT_SYMBOL_GPL(gta01bl_limit_intensity);
 227 +
 228 +
 229 +static struct backlight_ops gta01bl_ops = {
 230 +       .get_brightness = gta01bl_get_intensity,
 231 +       .update_status  = gta01bl_set_intensity,
 232 +};
 233 +
 234 +static int __init gta01bl_probe(struct platform_device *pdev)
 235 +{
 236 +       struct gta01bl_machinfo *machinfo = pdev->dev.platform_data;
 237 +       int rc;
 238 +
 239 +#ifdef GTA01_BACKLIGHT_ONOFF_ONLY
 240 +       s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
 241 +       gta01bl_prop.max_brightness = 1;
 242 +#else
 243 +       rc = gta01bl_init_hw();
 244 +       if (rc < 0)
 245 +               return rc;
 246 +#endif
 247 +       mutex_init(&gta01bl.mutex);
 248 +
 249 +       if (!machinfo->limit_mask)
 250 +               machinfo->limit_mask = -1;
 251 +
 252 +       gta01_backlight_device = backlight_device_register("gta01-bl",
 253 +                                                          &pdev->dev, NULL,
 254 +                                                          &gta01bl_ops);
 255 +       if (IS_ERR(gta01_backlight_device))
 256 +               return PTR_ERR(gta01_backlight_device);
 257 +
 258 +       gta01bl_prop.power = FB_BLANK_UNBLANK;
 259 +       gta01bl_prop.brightness = gta01bl_prop.max_brightness;
 260 +       memcpy(&gta01_backlight_device->props,
 261 +              &gta01bl_prop, sizeof(gta01bl_prop));
 262 +       gta01bl_send_intensity(gta01_backlight_device);
 263 +
 264 +       return 0;
 265 +}
 266 +
 267 +static int gta01bl_remove(struct platform_device *dev)
 268 +{
 269 +#ifndef GTA01_BACKLIGHT_ONOFF_ONLY
 270 +       s3c2410_pwm_disable(&gta01bl.pwm);
 271 +#endif
 272 +       backlight_device_unregister(gta01_backlight_device);
 273 +       mutex_destroy(&gta01bl.mutex);
 274 +
 275 +       s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
 276 +       s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
 277 +
 278 +       return 0;
 279 +}
 280 +
 281 +static struct platform_driver gta01bl_driver = {
 282 +       .probe          = gta01bl_probe,
 283 +       .remove         = gta01bl_remove,
 284 +       .suspend        = gta01bl_suspend,
 285 +       .resume         = gta01bl_resume,
 286 +       .driver         = {
 287 +               .name   = "gta01-bl",
 288 +       },
 289 +};
 290 +
 291 +static int __init gta01bl_init(void)
 292 +{
 293 +       return platform_driver_register(&gta01bl_driver);
 294 +}
 295 +
 296 +static void __exit gta01bl_exit(void)
 297 +{
 298 +       platform_driver_unregister(&gta01bl_driver);
 299 +}
 300 +
 301 +module_init(gta01bl_init);
 302 +module_exit(gta01bl_exit);
 303 +
 304 +MODULE_DESCRIPTION("FIC GTA01 (Neo1973) Backlight Driver");
 305 +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 306 +MODULE_LICENSE("GPL");
 307 --
 308 1.5.6.5
 309