target/linux/s3c24xx/patches-2.6.26/0013-gta01-backlight.patch.patch

   1 From deee418974cd5cc3b1aa9b1329d91b50f8bb7baf Mon Sep 17 00:00:00 2001
   2 From: mokopatches <mokopatches@openmoko.org>
   3 Date: Wed, 16 Jul 2008 14:44:49 +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    |    7 +
  10  drivers/video/backlight/Makefile   |    1 +
  11  drivers/video/backlight/gta01_bl.c |  255 ++++++++++++++++++++++++++++++++++++
  12  3 files changed, 263 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 dcd8073..475db76 100644
  17 --- a/drivers/video/backlight/Kconfig
  18 +++ b/drivers/video/backlight/Kconfig
  19 @@ -89,6 +89,13 @@ config BACKLIGHT_OMAP1
  20           the PWL module of OMAP1 processors.  Say Y if your board
  21           uses this hardware.
  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  config BACKLIGHT_HP680
  31         tristate "HP Jornada 680 Backlight Driver"
  32         depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX
  33 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
  34 index 33f6c7c..aee9f46 100644
  35 --- a/drivers/video/backlight/Makefile
  36 +++ b/drivers/video/backlight/Makefile
  37 @@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_LTV350QV)      += ltv350qv.o
  38
  39  obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
  40  obj-$(CONFIG_BACKLIGHT_CORGI)  += corgi_bl.o
  41 +obj-$(CONFIG_BACKLIGHT_GTA01)  += gta01_bl.o
  42  obj-$(CONFIG_BACKLIGHT_HP680)  += hp680_bl.o
  43  obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
  44  obj-$(CONFIG_BACKLIGHT_OMAP1)  += omap1_bl.o
  45 diff --git a/drivers/video/backlight/gta01_bl.c b/drivers/video/backlight/gta01_bl.c
  46 new file mode 100644
  47 index 0000000..c2bf0c9
  48 --- /dev/null
  49 +++ b/drivers/video/backlight/gta01_bl.c
  50 @@ -0,0 +1,255 @@
  51 +/*
  52 + *  Backlight Driver for FIC GTA01 (Neo1973) GSM Phone
  53 + *
  54 + * Copyright (C) 2006-2007 by OpenMoko, Inc.
  55 + * Author: Harald Welte <laforge@openmoko.org>
  56 + * All rights reserved.
  57 + *
  58 + *  based on corgi_cl.c, Copyright (c) 2004-2006 Richard Purdie
  59 + *
  60 + * This program is free software; you can redistribute it and/or
  61 + * modify it under the terms of the GNU General Public License as
  62 + * published by the Free Software Foundation, version 2.
  63 + *
  64 + * This program is distributed in the hope that it will be useful,
  65 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  66 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  67 + * GNU General Public License for more details.
  68 + *
  69 + * You should have received a copy of the GNU General Public License
  70 + * along with this program; if not, write to the Free Software
  71 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  72 + * MA 02111-1307 USA
  73 + *
  74 + * Javi Roman <javiroman@kernel-labs.org>:
  75 + *     implement PWM, instead of simple on/off switching
  76 + *
  77 + */
  78 +
  79 +#include <linux/module.h>
  80 +#include <linux/kernel.h>
  81 +#include <linux/init.h>
  82 +#include <linux/platform_device.h>
  83 +#include <linux/mutex.h>
  84 +#include <linux/fb.h>
  85 +#include <linux/backlight.h>
  86 +#include <linux/clk.h>
  87 +
  88 +#include <asm/arch/hardware.h>
  89 +#include <asm/arch/gta01.h>
  90 +#include <asm/arch/pwm.h>
  91 +
  92 +#include <asm/plat-s3c/regs-timer.h>
  93 +
  94 +static struct backlight_properties gta01bl_prop;
  95 +static struct backlight_device *gta01_backlight_device;
  96 +static struct gta01bl_machinfo *bl_machinfo;
  97 +
  98 +static unsigned long gta01bl_flags;
  99 +
 100 +struct gta01bl_data {
 101 +       int intensity;
 102 +       struct mutex mutex;
 103 +       struct clk *clk;
 104 +       struct s3c2410_pwm pwm;
 105 +};
 106 +
 107 +static struct gta01bl_data gta01bl;
 108 +
 109 +#define GTA01BL_SUSPENDED     0x01
 110 +#define GTA01BL_BATTLOW       0x02
 111 +
 112 +/* On the GTA01 / Neo1973, we use a 50 or 66MHz PCLK, which gives
 113 + * us a 6.25..8.25MHz DIV8 clock, which is further divided by a
 114 + * prescaler of 4, resulting in a 1.56..2.06MHz tick.  This results in a
 115 + * minimum frequency of 24..31Hz.  At 400Hz, we need to set the count
 116 + * to something like 3906..5156, providing us a way sufficient resolution
 117 + * for display brightness adjustment. */
 118 +#define GTA01BL_COUNTER 5156
 119 +
 120 +static int gta01bl_send_intensity(struct backlight_device *bd)
 121 +{
 122 +       int intensity = bd->props.brightness;
 123 +
 124 +       if (bd->props.power != FB_BLANK_UNBLANK)
 125 +               intensity = 0;
 126 +       if (bd->props.fb_blank != FB_BLANK_UNBLANK)
 127 +               intensity = 0;
 128 +       if (gta01bl_flags & GTA01BL_SUSPENDED)
 129 +               intensity = 0;
 130 +       if (gta01bl_flags & GTA01BL_BATTLOW)
 131 +               intensity &= bl_machinfo->limit_mask;
 132 +
 133 +       mutex_lock(&gta01bl.mutex);
 134 +#ifdef GTA01_BACKLIGHT_ONOFF_ONLY
 135 +       if (intensity)
 136 +               s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
 137 +       else
 138 +               s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 0);
 139 +#else
 140 +       if (intensity == bd->props.max_brightness) {
 141 +               s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
 142 +               s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
 143 +       } else  {
 144 +               s3c2410_pwm_duty_cycle(intensity & 0xffff, &gta01bl.pwm);
 145 +               s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPB0_TOUT0);
 146 +       }
 147 +#endif
 148 +       mutex_unlock(&gta01bl.mutex);
 149 +
 150 +       gta01bl.intensity = intensity;
 151 +       return 0;
 152 +}
 153 +
 154 +static int gta01bl_init_hw(void)
 155 +{
 156 +       int rc;
 157 +
 158 +       rc = s3c2410_pwm_init(&gta01bl.pwm);
 159 +       if (rc)
 160 +               return rc;
 161 +
 162 +       gta01bl.pwm.timerid = PWM0;
 163 +       gta01bl.pwm.prescaler = (4 - 1);
 164 +       gta01bl.pwm.divider = S3C2410_TCFG1_MUX0_DIV8;
 165 +       gta01bl.pwm.counter = GTA01BL_COUNTER;
 166 +       gta01bl.pwm.comparer = gta01bl.pwm.counter;
 167 +
 168 +       rc = s3c2410_pwm_enable(&gta01bl.pwm);
 169 +       if (rc)
 170 +               return rc;
 171 +
 172 +       s3c2410_pwm_start(&gta01bl.pwm);
 173 +
 174 +       gta01bl_prop.max_brightness = gta01bl.pwm.counter;
 175 +
 176 +       return 0;
 177 +}
 178 +
 179 +#ifdef CONFIG_PM
 180 +static int gta01bl_suspend(struct platform_device *dev, pm_message_t state)
 181 +{
 182 +       gta01bl_flags |= GTA01BL_SUSPENDED;
 183 +       gta01bl_send_intensity(gta01_backlight_device);
 184 +       return 0;
 185 +}
 186 +
 187 +static int gta01bl_resume(struct platform_device *dev)
 188 +{
 189 +       mutex_lock(&gta01bl.mutex);
 190 +       gta01bl_init_hw();
 191 +       mutex_unlock(&gta01bl.mutex);
 192 +
 193 +       gta01bl_flags &= ~GTA01BL_SUSPENDED;
 194 +       gta01bl_send_intensity(gta01_backlight_device);
 195 +       return 0;
 196 +}
 197 +#else
 198 +#define gta01bl_suspend        NULL
 199 +#define gta01bl_resume NULL
 200 +#endif
 201 +
 202 +static int gta01bl_get_intensity(struct backlight_device *bd)
 203 +{
 204 +       return gta01bl.intensity;
 205 +}
 206 +
 207 +static int gta01bl_set_intensity(struct backlight_device *bd)
 208 +{
 209 +       gta01bl_send_intensity(gta01_backlight_device);
 210 +       return 0;
 211 +}
 212 +
 213 +/*
 214 + * Called when the battery is low to limit the backlight intensity.
 215 + * If limit==0 clear any limit, otherwise limit the intensity
 216 + */
 217 +void gta01bl_limit_intensity(int limit)
 218 +{
 219 +       if (limit)
 220 +               gta01bl_flags |= GTA01BL_BATTLOW;
 221 +       else
 222 +               gta01bl_flags &= ~GTA01BL_BATTLOW;
 223 +       gta01bl_send_intensity(gta01_backlight_device);
 224 +}
 225 +EXPORT_SYMBOL_GPL(gta01bl_limit_intensity);
 226 +
 227 +
 228 +static struct backlight_ops gta01bl_ops = {
 229 +       .get_brightness = gta01bl_get_intensity,
 230 +       .update_status  = gta01bl_set_intensity,
 231 +};
 232 +
 233 +static int __init gta01bl_probe(struct platform_device *pdev)
 234 +{
 235 +       struct gta01bl_machinfo *machinfo = pdev->dev.platform_data;
 236 +       int rc;
 237 +
 238 +#ifdef GTA01_BACKLIGHT_ONOFF_ONLY
 239 +       s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
 240 +       gta01bl_prop.max_brightness = 1;
 241 +#else
 242 +       rc = gta01bl_init_hw();
 243 +       if (rc < 0)
 244 +               return rc;
 245 +#endif
 246 +       mutex_init(&gta01bl.mutex);
 247 +
 248 +       if (!machinfo->limit_mask)
 249 +               machinfo->limit_mask = -1;
 250 +
 251 +       gta01_backlight_device = backlight_device_register("gta01-bl",
 252 +                                                          &pdev->dev, NULL,
 253 +                                                          &gta01bl_ops);
 254 +       if (IS_ERR(gta01_backlight_device))
 255 +               return PTR_ERR(gta01_backlight_device);
 256 +
 257 +       gta01bl_prop.power = FB_BLANK_UNBLANK;
 258 +       gta01bl_prop.brightness = gta01bl_prop.max_brightness;
 259 +       memcpy(&gta01_backlight_device->props,
 260 +              &gta01bl_prop, sizeof(gta01bl_prop));
 261 +       gta01bl_send_intensity(gta01_backlight_device);
 262 +
 263 +       return 0;
 264 +}
 265 +
 266 +static int gta01bl_remove(struct platform_device *dev)
 267 +{
 268 +#ifndef GTA01_BACKLIGHT_ONOFF_ONLY
 269 +       s3c2410_pwm_disable(&gta01bl.pwm);
 270 +#endif
 271 +       backlight_device_unregister(gta01_backlight_device);
 272 +       mutex_destroy(&gta01bl.mutex);
 273 +
 274 +       s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
 275 +       s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
 276 +
 277 +       return 0;
 278 +}
 279 +
 280 +static struct platform_driver gta01bl_driver = {
 281 +       .probe          = gta01bl_probe,
 282 +       .remove         = gta01bl_remove,
 283 +       .suspend        = gta01bl_suspend,
 284 +       .resume         = gta01bl_resume,
 285 +       .driver         = {
 286 +               .name   = "gta01-bl",
 287 +       },
 288 +};
 289 +
 290 +static int __init gta01bl_init(void)
 291 +{
 292 +       return platform_driver_register(&gta01bl_driver);
 293 +}
 294 +
 295 +static void __exit gta01bl_exit(void)
 296 +{
 297 +       platform_driver_unregister(&gta01bl_driver);
 298 +}
 299 +
 300 +module_init(gta01bl_init);
 301 +module_exit(gta01bl_exit);
 302 +
 303 +MODULE_DESCRIPTION("FIC GTA01 (Neo1973) Backlight Driver");
 304 +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 305 +MODULE_LICENSE("GPL");
 306 --
 307 1.5.6.3
 308