target/linux/ixp4xx/patches-4.1/295-latch_led_driver.patch

   1 --- a/drivers/leds/Kconfig
   2 +++ b/drivers/leds/Kconfig
   3 @@ -271,6 +271,12 @@ config LEDS_LP8860
   4           on the LP8860 4 channel LED driver using the I2C communication
   5           bus.
   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  config LEDS_CLEVO_MAIL
  14         tristate "Mail LED on Clevo notebook"
  15         depends on LEDS_CLASS
  16 --- a/drivers/leds/Makefile
  17 +++ b/drivers/leds/Makefile
  18 @@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_SUNFIRE)            += leds-sunf
  19  obj-$(CONFIG_LEDS_PCA9532)             += leds-pca9532.o
  20  obj-$(CONFIG_LEDS_GPIO_REGISTER)       += leds-gpio-register.o
  21  obj-$(CONFIG_LEDS_GPIO)                        += leds-gpio.o
  22 +obj-$(CONFIG_LEDS_LATCH)               += leds-latch.o
  23  obj-$(CONFIG_LEDS_LP3944)              += leds-lp3944.o
  24  obj-$(CONFIG_LEDS_LP55XX_COMMON)       += leds-lp55xx-common.o
  25  obj-$(CONFIG_LEDS_LP5521)              += leds-lp5521.o
  26 --- /dev/null
  27 +++ b/drivers/leds/leds-latch.c
  28 @@ -0,0 +1,152 @@
  29 +/*
  30 + * LEDs driver for Memory Latched Devices
  31 + *
  32 + * Copyright (C) 2008 Gateworks Corp.
  33 + * Chris Lang <clang@gateworks.com>
  34 + *
  35 + * This program is free software; you can redistribute it and/or modify
  36 + * it under the terms of the GNU General Public License version 2 as
  37 + * published by the Free Software Foundation.
  38 + *
  39 + */
  40 +#include <linux/kernel.h>
  41 +#include <linux/slab.h>
  42 +#include <linux/init.h>
  43 +#include <linux/platform_device.h>
  44 +#include <linux/leds.h>
  45 +#include <linux/workqueue.h>
  46 +#include <asm/io.h>
  47 +#include <linux/spinlock.h>
  48 +#include <linux/slab.h>
  49 +#include <linux/module.h>
  50 +#include <linux/export.h>
  51 +
  52 +static unsigned int mem_keep = 0xFF;
  53 +static spinlock_t mem_lock;
  54 +static unsigned char *iobase;
  55 +
  56 +struct latch_led_data {
  57 +       struct led_classdev cdev;
  58 +       struct work_struct work;
  59 +       u8 new_level;
  60 +       u8 bit;
  61 +       void (*set_led)(u8 bit, enum led_brightness value);
  62 +};
  63 +
  64 +static void latch_set_led(u8 bit, enum led_brightness value)
  65 +{
  66 +       if (value == LED_OFF)
  67 +               mem_keep |= (0x1 << bit);
  68 +       else
  69 +               mem_keep &= ~(0x1 << bit);
  70 +
  71 +       writeb(mem_keep, iobase);
  72 +}
  73 +
  74 +static void latch_led_set(struct led_classdev *led_cdev,
  75 +       enum led_brightness value)
  76 +{
  77 +       struct latch_led_data *led_dat =
  78 +               container_of(led_cdev, struct latch_led_data, cdev);
  79 +
  80 +       raw_spin_lock(mem_lock);
  81 +
  82 +       led_dat->set_led(led_dat->bit, value);
  83 +
  84 +       raw_spin_unlock(mem_lock);
  85 +}
  86 +
  87 +static int latch_led_probe(struct platform_device *pdev)
  88 +{
  89 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
  90 +       struct latch_led *cur_led;
  91 +       struct latch_led_data *leds_data, *led_dat;
  92 +       int i, ret = 0;
  93 +
  94 +       if (!pdata)
  95 +               return -EBUSY;
  96 +
  97 +       leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
  98 +                               GFP_KERNEL);
  99 +       if (!leds_data)
 100 +               return -ENOMEM;
 101 +
 102 +       for (i = 0; i < pdata->num_leds; i++) {
 103 +               cur_led = &pdata->leds[i];
 104 +               led_dat = &leds_data[i];
 105 +
 106 +               led_dat->cdev.name = cur_led->name;
 107 +               led_dat->cdev.default_trigger = cur_led->default_trigger;
 108 +               led_dat->cdev.brightness_set = latch_led_set;
 109 +               led_dat->cdev.brightness = LED_OFF;
 110 +               led_dat->bit = cur_led->bit;
 111 +               led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
 112 +
 113 +               ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 114 +               if (ret < 0) {
 115 +                       goto err;
 116 +               }
 117 +       }
 118 +
 119 +       if (!pdata->set_led) {
 120 +               iobase = ioremap_nocache(pdata->mem, 0x1000);
 121 +               writeb(0xFF, iobase);
 122 +       }
 123 +       platform_set_drvdata(pdev, leds_data);
 124 +
 125 +       return 0;
 126 +
 127 +err:
 128 +       if (i > 0) {
 129 +               for (i = i - 1; i >= 0; i--) {
 130 +                       led_classdev_unregister(&leds_data[i].cdev);
 131 +               }
 132 +       }
 133 +
 134 +       kfree(leds_data);
 135 +
 136 +       return ret;
 137 +}
 138 +
 139 +static int latch_led_remove(struct platform_device *pdev)
 140 +{
 141 +       int i;
 142 +       struct latch_led_platform_data *pdata = pdev->dev.platform_data;
 143 +       struct latch_led_data *leds_data;
 144 +
 145 +       leds_data = platform_get_drvdata(pdev);
 146 +
 147 +       for (i = 0; i < pdata->num_leds; i++) {
 148 +               led_classdev_unregister(&leds_data[i].cdev);
 149 +               cancel_work_sync(&leds_data[i].work);
 150 +       }
 151 +
 152 +       kfree(leds_data);
 153 +
 154 +       return 0;
 155 +}
 156 +
 157 +static struct platform_driver latch_led_driver = {
 158 +       .probe          = latch_led_probe,
 159 +       .remove         = latch_led_remove,
 160 +       .driver         = {
 161 +               .name   = "leds-latch",
 162 +               .owner  = THIS_MODULE,
 163 +       },
 164 +};
 165 +
 166 +static int __init latch_led_init(void)
 167 +{
 168 +       return platform_driver_register(&latch_led_driver);
 169 +}
 170 +
 171 +static void __exit latch_led_exit(void)
 172 +{
 173 +       platform_driver_unregister(&latch_led_driver);
 174 +}
 175 +
 176 +module_init(latch_led_init);
 177 +module_exit(latch_led_exit);
 178 +
 179 +MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
 180 +MODULE_DESCRIPTION("Latch LED driver");
 181 --- a/include/linux/leds.h
 182 +++ b/include/linux/leds.h
 183 @@ -344,4 +344,18 @@ static inline void ledtrig_cpu(enum cpu_
 184  }
 185  #endif
 186
 187 +/* For the leds-latch driver */
 188 +struct latch_led {
 189 +       const char *name;
 190 +       char *default_trigger;
 191 +       unsigned  bit;
 192 +};
 193 +
 194 +struct latch_led_platform_data {
 195 +       int     num_leds;
 196 +       u32     mem;
 197 +       struct latch_led *leds;
 198 +       void    (*set_led)(u8 bit, enum led_brightness value);
 199 +};
 200 +
 201  #endif         /* __LINUX_LEDS_H_INCLUDED */