target/linux/ixp4xx/patches-3.3/295-latch_led_driver.patch

   1 --- a/drivers/leds/Kconfig
   2 +++ b/drivers/leds/Kconfig
   3 @@ -204,6 +204,13 @@ config LEDS_LP5523
   4           Driver provides direct control via LED class and interface for
   5           programming the engines.
   6
   7 +config LEDS_LATCH
   8 +       tristate "LED Support for Memory Latched LEDs"
   9 +       depends on LEDS_CLASS
  10 +       help
  11 +               -- To Do --
  12 +
  13 +
  14  config LEDS_CLEVO_MAIL
  15         tristate "Mail LED on Clevo notebook"
  16         depends on LEDS_CLASS
  17 --- /dev/null
  18 +++ b/drivers/leds/leds-latch.c
  19 @@ -0,0 +1,152 @@
  20 +/*
  21 + * LEDs driver for Memory Latched Devices
  22 + *
  23 + * Copyright (C) 2008 Gateworks Corp.
  24 + * Chris Lang <clang@gateworks.com>
  25 + *
  26 + * This program is free software; you can redistribute it and/or modify
  27 + * it under the terms of the GNU General Public License version 2 as
  28 + * published by the Free Software Foundation.
  29 + *
  30 + */
  31 +#include <linux/kernel.h>
  32 +#include <linux/slab.h>
  33 +#include <linux/init.h>
  34 +#include <linux/platform_device.h>
  35 +#include <linux/leds.h>
  36 +#include <linux/workqueue.h>
  37 +#include <asm/io.h>
  38 +#include <linux/spinlock.h>
  39 +#include <linux/slab.h>
  40 +#include <linux/module.h>
  41 +#include <linux/export.h>
  42 +
  43 +static unsigned int mem_keep = 0xFF;
  44 +static spinlock_t mem_lock;
  45 +static unsigned char *iobase;
  46 +
  47 +struct latch_led_data {
  48 +       struct led_classdev cdev;
  49 +       struct work_struct work;
  50 +       u8 new_level;
  51 +       u8 bit;
  52 +       void (*set_led)(u8 bit, enum led_brightness value);
  53 +};
  54 +
  55 +static void latch_set_led(u8 bit, enum led_brightness value)
  56 +{
  57 +       if (value == LED_OFF)
  58 +               mem_keep |= (0x1 << bit);
  59 +       else
  60 +               mem_keep &= ~(0x1 << bit);
  61 +
  62 +       writeb(mem_keep, iobase);
  63 +}
  64 +
  65 +static void latch_led_set(struct led_classdev *led_cdev,
  66 +       enum led_brightness value)
  67 +{
  68 +       struct latch_led_data *led_dat =
  69 +               container_of(led_cdev, struct latch_led_data, cdev);
  70 +
  71 +       raw_spin_lock(mem_lock);
  72 +
  73 +       led_dat->set_led(led_dat->bit, value);
  74 +
  75 +       raw_spin_unlock(mem_lock);
  76 +}
  77 +
  78 +static int latch_led_probe(struct platform_device *pdev)
  79 +{
  80 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
  81 +       struct latch_led *cur_led;
  82 +       struct latch_led_data *leds_data, *led_dat;
  83 +       int i, ret = 0;
  84 +
  85 +       if (!pdata)
  86 +               return -EBUSY;
  87 +
  88 +       leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
  89 +                               GFP_KERNEL);
  90 +       if (!leds_data)
  91 +               return -ENOMEM;
  92 +
  93 +       for (i = 0; i < pdata->num_leds; i++) {
  94 +               cur_led = &pdata->leds[i];
  95 +               led_dat = &leds_data[i];
  96 +
  97 +               led_dat->cdev.name = cur_led->name;
  98 +               led_dat->cdev.default_trigger = cur_led->default_trigger;
  99 +               led_dat->cdev.brightness_set = latch_led_set;
 100 +               led_dat->cdev.brightness = LED_OFF;
 101 +               led_dat->bit = cur_led->bit;
 102 +               led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
 103 +
 104 +               ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 105 +               if (ret < 0) {
 106 +                       goto err;
 107 +               }
 108 +       }
 109 +
 110 +       if (!pdata->set_led) {
 111 +               iobase = ioremap_nocache(pdata->mem, 0x1000);
 112 +               writeb(0xFF, iobase);
 113 +       }
 114 +       platform_set_drvdata(pdev, leds_data);
 115 +
 116 +       return 0;
 117 +
 118 +err:
 119 +       if (i > 0) {
 120 +               for (i = i - 1; i >= 0; i--) {
 121 +                       led_classdev_unregister(&leds_data[i].cdev);
 122 +               }
 123 +       }
 124 +
 125 +       kfree(leds_data);
 126 +
 127 +       return ret;
 128 +}
 129 +
 130 +static int __devexit latch_led_remove(struct platform_device *pdev)
 131 +{
 132 +       int i;
 133 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
 134 +       struct latch_led_data *leds_data;
 135 +
 136 +       leds_data = platform_get_drvdata(pdev);
 137 +
 138 +       for (i = 0; i < pdata->num_leds; i++) {
 139 +               led_classdev_unregister(&leds_data[i].cdev);
 140 +               cancel_work_sync(&leds_data[i].work);
 141 +       }
 142 +
 143 +       kfree(leds_data);
 144 +
 145 +       return 0;
 146 +}
 147 +
 148 +static struct platform_driver latch_led_driver = {
 149 +       .probe          = latch_led_probe,
 150 +       .remove         = __devexit_p(latch_led_remove),
 151 +       .driver         = {
 152 +               .name   = "leds-latch",
 153 +               .owner  = THIS_MODULE,
 154 +       },
 155 +};
 156 +
 157 +static int __init latch_led_init(void)
 158 +{
 159 +       return platform_driver_register(&latch_led_driver);
 160 +}
 161 +
 162 +static void __exit latch_led_exit(void)
 163 +{
 164 +       platform_driver_unregister(&latch_led_driver);
 165 +}
 166 +
 167 +module_init(latch_led_init);
 168 +module_exit(latch_led_exit);
 169 +
 170 +MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
 171 +MODULE_DESCRIPTION("Latch LED driver");
 172 --- a/drivers/leds/Makefile
 173 +++ b/drivers/leds/Makefile
 174 @@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_SUNFIRE)            += leds-sunf
 175  obj-$(CONFIG_LEDS_PCA9532)             += leds-pca9532.o
 176  obj-$(CONFIG_LEDS_GPIO_REGISTER)       += leds-gpio-register.o
 177  obj-$(CONFIG_LEDS_GPIO)                        += leds-gpio.o
 178 +obj-$(CONFIG_LEDS_LATCH)               += leds-latch.o
 179  obj-$(CONFIG_LEDS_LP3944)              += leds-lp3944.o
 180  obj-$(CONFIG_LEDS_LP5521)              += leds-lp5521.o
 181  obj-$(CONFIG_LEDS_LP5523)              += leds-lp5523.o
 182 --- a/include/linux/leds.h
 183 +++ b/include/linux/leds.h
 184 @@ -210,4 +210,18 @@ struct gpio_led_platform_data {
 185  struct platform_device *gpio_led_register_device(
 186                 int id, const struct gpio_led_platform_data *pdata);
 187
 188 +/* For the leds-latch driver */
 189 +struct latch_led {
 190 +       const char *name;
 191 +       char *default_trigger;
 192 +       unsigned  bit;
 193 +};
 194 +
 195 +struct latch_led_platform_data {
 196 +       int     num_leds;
 197 +       u32     mem;
 198 +       struct latch_led *leds;
 199 +       void    (*set_led)(u8 bit, enum led_brightness value);
 200 +};
 201 +
 202  #endif         /* __LINUX_LEDS_H_INCLUDED */