target/linux/ixp4xx/patches-2.6.37/295-latch_led_driver.patch

   1 --- a/drivers/leds/Kconfig
   2 +++ b/drivers/leds/Kconfig
   3 @@ -210,6 +210,13 @@ 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 +1,150 @@
  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 +
  41 +static unsigned int mem_keep = 0xFF;
  42 +static spinlock_t mem_lock;
  43 +static unsigned char *iobase;
  44 +
  45 +struct latch_led_data {
  46 +       struct led_classdev cdev;
  47 +       struct work_struct work;
  48 +       u8 new_level;
  49 +       u8 bit;
  50 +       void (*set_led)(u8 bit, enum led_brightness value);
  51 +};
  52 +
  53 +static void latch_set_led(u8 bit, enum led_brightness value)
  54 +{
  55 +       if (value == LED_OFF)
  56 +               mem_keep |= (0x1 << bit);
  57 +       else
  58 +               mem_keep &= ~(0x1 << bit);
  59 +
  60 +       writeb(mem_keep, iobase);
  61 +}
  62 +
  63 +static void latch_led_set(struct led_classdev *led_cdev,
  64 +       enum led_brightness value)
  65 +{
  66 +       struct latch_led_data *led_dat =
  67 +               container_of(led_cdev, struct latch_led_data, cdev);
  68 +
  69 +       raw_spin_lock(mem_lock);
  70 +
  71 +       led_dat->set_led(led_dat->bit, value);
  72 +
  73 +       raw_spin_unlock(mem_lock);
  74 +}
  75 +
  76 +static int latch_led_probe(struct platform_device *pdev)
  77 +{
  78 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
  79 +       struct latch_led *cur_led;
  80 +       struct latch_led_data *leds_data, *led_dat;
  81 +       int i, ret = 0;
  82 +
  83 +       if (!pdata)
  84 +               return -EBUSY;
  85 +
  86 +       leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
  87 +                               GFP_KERNEL);
  88 +       if (!leds_data)
  89 +               return -ENOMEM;
  90 +
  91 +       for (i = 0; i < pdata->num_leds; i++) {
  92 +               cur_led = &pdata->leds[i];
  93 +               led_dat = &leds_data[i];
  94 +
  95 +               led_dat->cdev.name = cur_led->name;
  96 +               led_dat->cdev.default_trigger = cur_led->default_trigger;
  97 +               led_dat->cdev.brightness_set = latch_led_set;
  98 +               led_dat->cdev.brightness = LED_OFF;
  99 +               led_dat->bit = cur_led->bit;
 100 +               led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
 101 +
 102 +               ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 103 +               if (ret < 0) {
 104 +                       goto err;
 105 +               }
 106 +       }
 107 +
 108 +       if (!pdata->set_led) {
 109 +               iobase = ioremap_nocache(pdata->mem, 0x1000);
 110 +               writeb(0xFF, iobase);
 111 +       }
 112 +       platform_set_drvdata(pdev, leds_data);
 113 +
 114 +       return 0;
 115 +
 116 +err:
 117 +       if (i > 0) {
 118 +               for (i = i - 1; i >= 0; i--) {
 119 +                       led_classdev_unregister(&leds_data[i].cdev);
 120 +               }
 121 +       }
 122 +
 123 +       kfree(leds_data);
 124 +
 125 +       return ret;
 126 +}
 127 +
 128 +static int __devexit latch_led_remove(struct platform_device *pdev)
 129 +{
 130 +       int i;
 131 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
 132 +       struct latch_led_data *leds_data;
 133 +
 134 +       leds_data = platform_get_drvdata(pdev);
 135 +
 136 +       for (i = 0; i < pdata->num_leds; i++) {
 137 +               led_classdev_unregister(&leds_data[i].cdev);
 138 +               cancel_work_sync(&leds_data[i].work);
 139 +       }
 140 +
 141 +       kfree(leds_data);
 142 +
 143 +       return 0;
 144 +}
 145 +
 146 +static struct platform_driver latch_led_driver = {
 147 +       .probe          = latch_led_probe,
 148 +       .remove         = __devexit_p(latch_led_remove),
 149 +       .driver         = {
 150 +               .name   = "leds-latch",
 151 +               .owner  = THIS_MODULE,
 152 +       },
 153 +};
 154 +
 155 +static int __init latch_led_init(void)
 156 +{
 157 +       return platform_driver_register(&latch_led_driver);
 158 +}
 159 +
 160 +static void __exit latch_led_exit(void)
 161 +{
 162 +       platform_driver_unregister(&latch_led_driver);
 163 +}
 164 +
 165 +module_init(latch_led_init);
 166 +module_exit(latch_led_exit);
 167 +
 168 +MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
 169 +MODULE_DESCRIPTION("Latch LED driver");
 170 --- a/drivers/leds/Makefile
 171 +++ b/drivers/leds/Makefile
 172 @@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_COBALT_RAQ)         += leds-c
 173  obj-$(CONFIG_LEDS_SUNFIRE)             += leds-sunfire.o
 174  obj-$(CONFIG_LEDS_PCA9532)             += leds-pca9532.o
 175  obj-$(CONFIG_LEDS_GPIO)                        += leds-gpio.o
 176 +obj-$(CONFIG_LEDS_LATCH)               += leds-latch.o
 177  obj-$(CONFIG_LEDS_LP3944)              += leds-lp3944.o
 178  obj-$(CONFIG_LEDS_LP5521)              += leds-lp5521.o
 179  obj-$(CONFIG_LEDS_LP5523)              += leds-lp5523.o
 180 --- a/include/linux/leds.h
 181 +++ b/include/linux/leds.h
 182 @@ -204,5 +204,19 @@ struct gpio_led_platform_data {
 183                                         unsigned long *delay_off);
 184  };
 185
 186 +/* For the leds-latch driver */
 187 +struct latch_led {
 188 +       const char *name;
 189 +       char *default_trigger;
 190 +       unsigned  bit;
 191 +};
 192 +
 193 +struct latch_led_platform_data {
 194 +       int     num_leds;
 195 +       u32     mem;
 196 +       struct latch_led *leds;
 197 +       void    (*set_led)(u8 bit, enum led_brightness value);
 198 +};
 199 +
 200
 201  #endif         /* __LINUX_LEDS_H_INCLUDED */