target/linux/ixp4xx/patches-2.6.25/295-latch_led_driver.patch

   1 Index: linux-2.6.25.4/drivers/leds/Kconfig
   2 ===================================================================
   3 --- linux-2.6.25.4.orig/drivers/leds/Kconfig
   4 +++ linux-2.6.25.4/drivers/leds/Kconfig
   5 @@ -125,6 +125,12 @@ config LEDS_GPIO
   6           outputs. To be useful the particular board must have LEDs
   7           and they must be connected to the GPIO lines.
   8
   9 +config LEDS_LATCH
  10 +       tristate "LED Support for Memory Latched LEDs"
  11 +       depends on LEDS_CLASS
  12 +       help
  13 +               -- To Do --
  14 +
  15  config LEDS_CM_X270
  16         tristate "LED Support for the CM-X270 LEDs"
  17         depends on LEDS_CLASS && MACH_ARMCORE
  18 Index: linux-2.6.25.4/drivers/leds/leds-latch.c
  19 ===================================================================
  20 --- /dev/null
  21 +++ linux-2.6.25.4/drivers/leds/leds-latch.c
  22 @@ -0,0 +1,141 @@
  23 +/*
  24 + * LEDs driver for Memory Latched Devices
  25 + *
  26 + * Copyright (C) 2008 Gateworks Corp.
  27 + * Chris Lang <clang@gateworks.com>
  28 + *
  29 + * This program is free software; you can redistribute it and/or modify
  30 + * it under the terms of the GNU General Public License version 2 as
  31 + * published by the Free Software Foundation.
  32 + *
  33 + */
  34 +#include <linux/kernel.h>
  35 +#include <linux/init.h>
  36 +#include <linux/platform_device.h>
  37 +#include <linux/leds.h>
  38 +#include <linux/workqueue.h>
  39 +#include <asm/io.h>
  40 +#include <linux/spinlock.h>
  41 +
  42 +static unsigned int mem_keep = 0xFF;
  43 +static spinlock_t mem_lock;
  44 +static unsigned char *iobase;
  45 +
  46 +struct latch_led_data {
  47 +       struct led_classdev cdev;
  48 +       struct work_struct work;
  49 +       u8 new_level;
  50 +       u8 bit;
  51 +};
  52 +
  53 +static void latch_led_set(struct led_classdev *led_cdev,
  54 +       enum led_brightness value)
  55 +{
  56 +       struct latch_led_data *led_dat =
  57 +               container_of(led_cdev, struct latch_led_data, cdev);
  58 +
  59 +       spin_lock(mem_lock);
  60 +
  61 +       if (value == LED_OFF)
  62 +               mem_keep |= (0x1 << led_dat->bit);
  63 +       else
  64 +               mem_keep &= ~(0x1 << led_dat->bit);
  65 +
  66 +       writeb(mem_keep, iobase);
  67 +
  68 +       spin_unlock(mem_lock);
  69 +}
  70 +
  71 +static int latch_led_probe(struct platform_device *pdev)
  72 +{
  73 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
  74 +       struct latch_led *cur_led;
  75 +       struct latch_led_data *leds_data, *led_dat;
  76 +       int i, ret = 0;
  77 +
  78 +       if (!pdata)
  79 +               return -EBUSY;
  80 +
  81 +       leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
  82 +                               GFP_KERNEL);
  83 +       if (!leds_data)
  84 +               return -ENOMEM;
  85 +
  86 +       iobase = ioremap_nocache(pdata->mem, 0x1000);
  87 +       writeb(0xFF, iobase);
  88 +
  89 +       for (i = 0; i < pdata->num_leds; i++) {
  90 +               cur_led = &pdata->leds[i];
  91 +               led_dat = &leds_data[i];
  92 +
  93 +               led_dat->cdev.name = cur_led->name;
  94 +               led_dat->cdev.default_trigger = cur_led->default_trigger;
  95 +               led_dat->cdev.brightness_set = latch_led_set;
  96 +               led_dat->cdev.brightness = LED_OFF;
  97 +               led_dat->bit = cur_led->bit;
  98 +
  99 +               ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 100 +               if (ret < 0) {
 101 +                       goto err;
 102 +               }
 103 +       }
 104 +
 105 +       platform_set_drvdata(pdev, leds_data);
 106 +
 107 +       return 0;
 108 +
 109 +err:
 110 +       if (i > 0) {
 111 +               for (i = i - 1; i >= 0; i--) {
 112 +                       led_classdev_unregister(&leds_data[i].cdev);
 113 +               }
 114 +       }
 115 +
 116 +       kfree(leds_data);
 117 +
 118 +       return ret;
 119 +}
 120 +
 121 +static int __devexit latch_led_remove(struct platform_device *pdev)
 122 +{
 123 +       int i;
 124 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
 125 +       struct latch_led_data *leds_data;
 126 +
 127 +       leds_data = platform_get_drvdata(pdev);
 128 +
 129 +       for (i = 0; i < pdata->num_leds; i++) {
 130 +               led_classdev_unregister(&leds_data[i].cdev);
 131 +               cancel_work_sync(&leds_data[i].work);
 132 +       }
 133 +
 134 +       kfree(leds_data);
 135 +
 136 +       return 0;
 137 +}
 138 +
 139 +static struct platform_driver latch_led_driver = {
 140 +       .probe          = latch_led_probe,
 141 +       .remove         = __devexit_p(latch_led_remove),
 142 +       .driver         = {
 143 +               .name   = "leds-latch",
 144 +               .owner  = THIS_MODULE,
 145 +       },
 146 +};
 147 +
 148 +static int __init latch_led_init(void)
 149 +{
 150 +       return platform_driver_register(&latch_led_driver);
 151 +}
 152 +
 153 +static void __exit latch_led_exit(void)
 154 +{
 155 +       platform_driver_unregister(&latch_led_driver);
 156 +}
 157 +
 158 +module_init(latch_led_init);
 159 +module_exit(latch_led_exit);
 160 +
 161 +MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
 162 +MODULE_DESCRIPTION("Latch LED driver");
 163 +MODULE_LICENSE("GPL");
 164 Index: linux-2.6.25.4/drivers/leds/Makefile
 165 ===================================================================
 166 --- linux-2.6.25.4.orig/drivers/leds/Makefile
 167 +++ linux-2.6.25.4/drivers/leds/Makefile
 168 @@ -19,6 +19,7 @@ obj-$(CONFIG_LEDS_H1940)              += leds-h1940.
 169  obj-$(CONFIG_LEDS_COBALT_QUBE)         += leds-cobalt-qube.o
 170  obj-$(CONFIG_LEDS_COBALT_RAQ)          += leds-cobalt-raq.o
 171  obj-$(CONFIG_LEDS_GPIO)                        += leds-gpio.o
 172 +obj-$(CONFIG_LEDS_LATCH)     += leds-latch.o
 173  obj-$(CONFIG_LEDS_CM_X270)              += leds-cm-x270.o
 174  obj-$(CONFIG_LEDS_CLEVO_MAIL)          += leds-clevo-mail.o
 175  obj-$(CONFIG_LEDS_HP6XX)               += leds-hp6xx.o
 176 Index: linux-2.6.25.4/include/linux/leds.h
 177 ===================================================================
 178 --- linux-2.6.25.4.orig/include/linux/leds.h
 179 +++ linux-2.6.25.4/include/linux/leds.h
 180 @@ -136,5 +136,18 @@ struct gpio_led_platform_data {
 181         struct gpio_led *leds;
 182  };
 183
 184 +/* For the leds-latch driver */
 185 +struct latch_led {
 186 +       const char *name;
 187 +       char *default_trigger;
 188 +       unsigned  bit;
 189 +};
 190 +
 191 +struct latch_led_platform_data {
 192 +       int     num_leds;
 193 +       u32     mem;
 194 +       struct latch_led *leds;
 195 +};
 196 +
 197
 198  #endif         /* __LINUX_LEDS_H_INCLUDED */