target/linux/ixp4xx/patches-2.6.30/295-latch_led_driver.patch

   1 --- a/drivers/leds/Kconfig
   2 +++ b/drivers/leds/Kconfig
   3 @@ -155,6 +155,13 @@ config LEDS_LP5521
   4           This driver can be built as a module by choosing 'M'. The module
   5           will be called leds-lp5521.
   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 && X86 && SERIO_I8042 && DMI
  17 --- /dev/null
  18 +++ b/drivers/leds/leds-latch.c
  19 @@ -0,0 +1,149 @@
  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/init.h>
  33 +#include <linux/platform_device.h>
  34 +#include <linux/leds.h>
  35 +#include <linux/workqueue.h>
  36 +#include <asm/io.h>
  37 +#include <linux/spinlock.h>
  38 +
  39 +static unsigned int mem_keep = 0xFF;
  40 +static spinlock_t mem_lock;
  41 +static unsigned char *iobase;
  42 +
  43 +struct latch_led_data {
  44 +       struct led_classdev cdev;
  45 +       struct work_struct work;
  46 +       u8 new_level;
  47 +       u8 bit;
  48 +       void (*set_led)(u8 bit, enum led_brightness value);
  49 +};
  50 +
  51 +static void latch_set_led(u8 bit, enum led_brightness value)
  52 +{
  53 +       if (value == LED_OFF)
  54 +               mem_keep |= (0x1 << bit);
  55 +       else
  56 +               mem_keep &= ~(0x1 << bit);
  57 +
  58 +       writeb(mem_keep, iobase);
  59 +}
  60 +
  61 +static void latch_led_set(struct led_classdev *led_cdev,
  62 +       enum led_brightness value)
  63 +{
  64 +       struct latch_led_data *led_dat =
  65 +               container_of(led_cdev, struct latch_led_data, cdev);
  66 +
  67 +       spin_lock(mem_lock);
  68 +
  69 +       led_dat->set_led(led_dat->bit, value);
  70 +
  71 +       spin_unlock(mem_lock);
  72 +}
  73 +
  74 +static int latch_led_probe(struct platform_device *pdev)
  75 +{
  76 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
  77 +       struct latch_led *cur_led;
  78 +       struct latch_led_data *leds_data, *led_dat;
  79 +       int i, ret = 0;
  80 +
  81 +       if (!pdata)
  82 +               return -EBUSY;
  83 +
  84 +       leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
  85 +                               GFP_KERNEL);
  86 +       if (!leds_data)
  87 +               return -ENOMEM;
  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 +               led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
  99 +
 100 +               ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 101 +               if (ret < 0) {
 102 +                       goto err;
 103 +               }
 104 +       }
 105 +
 106 +       if (!pdata->set_led) {
 107 +               iobase = ioremap_nocache(pdata->mem, 0x1000);
 108 +               writeb(0xFF, iobase);
 109 +       }
 110 +       platform_set_drvdata(pdev, leds_data);
 111 +
 112 +       return 0;
 113 +
 114 +err:
 115 +       if (i > 0) {
 116 +               for (i = i - 1; i >= 0; i--) {
 117 +                       led_classdev_unregister(&leds_data[i].cdev);
 118 +               }
 119 +       }
 120 +
 121 +       kfree(leds_data);
 122 +
 123 +       return ret;
 124 +}
 125 +
 126 +static int __devexit latch_led_remove(struct platform_device *pdev)
 127 +{
 128 +       int i;
 129 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
 130 +       struct latch_led_data *leds_data;
 131 +
 132 +       leds_data = platform_get_drvdata(pdev);
 133 +
 134 +       for (i = 0; i < pdata->num_leds; i++) {
 135 +               led_classdev_unregister(&leds_data[i].cdev);
 136 +               cancel_work_sync(&leds_data[i].work);
 137 +       }
 138 +
 139 +       kfree(leds_data);
 140 +
 141 +       return 0;
 142 +}
 143 +
 144 +static struct platform_driver latch_led_driver = {
 145 +       .probe          = latch_led_probe,
 146 +       .remove         = __devexit_p(latch_led_remove),
 147 +       .driver         = {
 148 +               .name   = "leds-latch",
 149 +               .owner  = THIS_MODULE,
 150 +       },
 151 +};
 152 +
 153 +static int __init latch_led_init(void)
 154 +{
 155 +       return platform_driver_register(&latch_led_driver);
 156 +}
 157 +
 158 +static void __exit latch_led_exit(void)
 159 +{
 160 +       platform_driver_unregister(&latch_led_driver);
 161 +}
 162 +
 163 +module_init(latch_led_init);
 164 +module_exit(latch_led_exit);
 165 +
 166 +MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
 167 +MODULE_DESCRIPTION("Latch LED driver");
 168 +MODULE_LICENSE("GPL");
 169 --- a/drivers/leds/Makefile
 170 +++ b/drivers/leds/Makefile
 171 @@ -20,6 +20,7 @@ obj-$(CONFIG_LEDS_COBALT_RAQ)         += leds-c
 172  obj-$(CONFIG_LEDS_SUNFIRE)             += leds-sunfire.o
 173  obj-$(CONFIG_LEDS_PCA9532)             += leds-pca9532.o
 174  obj-$(CONFIG_LEDS_GPIO)                        += leds-gpio.o
 175 +obj-$(CONFIG_LEDS_LATCH)               += leds-latch.o
 176  obj-$(CONFIG_LEDS_CLEVO_MAIL)          += leds-clevo-mail.o
 177  obj-$(CONFIG_LEDS_HP6XX)               += leds-hp6xx.o
 178  obj-$(CONFIG_LEDS_FSG)                 += leds-fsg.o
 179 --- a/include/linux/leds.h
 180 +++ b/include/linux/leds.h
 181 @@ -153,5 +153,19 @@ struct gpio_led_platform_data {
 182                                         unsigned long *delay_off);
 183  };
 184
 185 +/* For the leds-latch driver */
 186 +struct latch_led {
 187 +       const char *name;
 188 +       char *default_trigger;
 189 +       unsigned  bit;
 190 +};
 191 +
 192 +struct latch_led_platform_data {
 193 +       int     num_leds;
 194 +       u32     mem;
 195 +       struct latch_led *leds;
 196 +       void    (*set_led)(u8 bit, enum led_brightness value);
 197 +};
 198 +
 199
 200  #endif         /* __LINUX_LEDS_H_INCLUDED */