target/linux/generic-2.6/patches-2.6.23/922-w1_gpio_driver_backport.patch

   1 Index: linux-2.6.23.17/drivers/w1/masters/Kconfig
   2 ===================================================================
   3 --- linux-2.6.23.17.orig/drivers/w1/masters/Kconfig
   4 +++ linux-2.6.23.17/drivers/w1/masters/Kconfig
   5 @@ -42,5 +42,15 @@ config W1_MASTER_DS1WM
   6           in HP iPAQ devices like h5xxx, h2200, and ASIC3-based like
   7           hx4700.
   8
   9 +config W1_MASTER_GPIO
  10 +       tristate "GPIO 1-wire busmaster"
  11 +       depends on GENERIC_GPIO
  12 +       help
  13 +         Say Y here if you want to communicate with your 1-wire devices using
  14 +         GPIO pins. This driver uses the GPIO API to control the wire.
  15 +
  16 +         This support is also available as a module.  If so, the module
  17 +         will be called w1-gpio.ko.
  18 +
  19  endmenu
  20
  21 Index: linux-2.6.23.17/drivers/w1/masters/Makefile
  22 ===================================================================
  23 --- linux-2.6.23.17.orig/drivers/w1/masters/Makefile
  24 +++ linux-2.6.23.17/drivers/w1/masters/Makefile
  25 @@ -6,3 +6,4 @@ obj-$(CONFIG_W1_MASTER_MATROX)          += matro
  26  obj-$(CONFIG_W1_MASTER_DS2490)         += ds2490.o
  27  obj-$(CONFIG_W1_MASTER_DS2482)         += ds2482.o
  28  obj-$(CONFIG_W1_MASTER_DS1WM)          += ds1wm.o
  29 +obj-$(CONFIG_W1_MASTER_GPIO)           += w1-gpio.o
  30 Index: linux-2.6.23.17/drivers/w1/masters/w1-gpio.c
  31 ===================================================================
  32 --- /dev/null
  33 +++ linux-2.6.23.17/drivers/w1/masters/w1-gpio.c
  34 @@ -0,0 +1,124 @@
  35 +/*
  36 + * w1-gpio - GPIO w1 bus master driver
  37 + *
  38 + * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
  39 + *
  40 + * This program is free software; you can redistribute it and/or modify
  41 + * it under the terms of the GNU General Public License version 2
  42 + * as published by the Free Software Foundation.
  43 + */
  44 +
  45 +#include <linux/init.h>
  46 +#include <linux/module.h>
  47 +#include <linux/platform_device.h>
  48 +#include <linux/w1-gpio.h>
  49 +
  50 +#include "../w1.h"
  51 +#include "../w1_int.h"
  52 +
  53 +#include <asm/gpio.h>
  54 +
  55 +static void w1_gpio_write_bit_dir(void *data, u8 bit)
  56 +{
  57 +       struct w1_gpio_platform_data *pdata = data;
  58 +
  59 +       if (bit)
  60 +               gpio_direction_input(pdata->pin);
  61 +       else
  62 +               gpio_direction_output(pdata->pin, 0);
  63 +}
  64 +
  65 +static void w1_gpio_write_bit_val(void *data, u8 bit)
  66 +{
  67 +       struct w1_gpio_platform_data *pdata = data;
  68 +
  69 +       gpio_set_value(pdata->pin, bit);
  70 +}
  71 +
  72 +static u8 w1_gpio_read_bit(void *data)
  73 +{
  74 +       struct w1_gpio_platform_data *pdata = data;
  75 +
  76 +       return gpio_get_value(pdata->pin);
  77 +}
  78 +
  79 +static int __init w1_gpio_probe(struct platform_device *pdev)
  80 +{
  81 +       struct w1_bus_master *master;
  82 +       struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
  83 +       int err;
  84 +
  85 +       if (!pdata)
  86 +               return -ENXIO;
  87 +
  88 +       master = kzalloc(sizeof(struct w1_bus_master), GFP_KERNEL);
  89 +       if (!master)
  90 +               return -ENOMEM;
  91 +
  92 +       err = gpio_request(pdata->pin, "w1");
  93 +       if (err)
  94 +               goto free_master;
  95 +
  96 +       master->data = pdata;
  97 +       master->read_bit = w1_gpio_read_bit;
  98 +
  99 +       if (pdata->is_open_drain) {
 100 +               gpio_direction_output(pdata->pin, 1);
 101 +               master->write_bit = w1_gpio_write_bit_val;
 102 +       } else {
 103 +               gpio_direction_input(pdata->pin);
 104 +               master->write_bit = w1_gpio_write_bit_dir;
 105 +       }
 106 +
 107 +       err = w1_add_master_device(master);
 108 +       if (err)
 109 +               goto free_gpio;
 110 +
 111 +       platform_set_drvdata(pdev, master);
 112 +
 113 +       return 0;
 114 +
 115 + free_gpio:
 116 +       gpio_free(pdata->pin);
 117 + free_master:
 118 +       kfree(master);
 119 +
 120 +       return err;
 121 +}
 122 +
 123 +static int __exit w1_gpio_remove(struct platform_device *pdev)
 124 +{
 125 +       struct w1_bus_master *master = platform_get_drvdata(pdev);
 126 +       struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
 127 +
 128 +       w1_remove_master_device(master);
 129 +       gpio_free(pdata->pin);
 130 +       kfree(master);
 131 +
 132 +       return 0;
 133 +}
 134 +
 135 +static struct platform_driver w1_gpio_driver = {
 136 +       .driver = {
 137 +               .name   = "w1-gpio",
 138 +               .owner  = THIS_MODULE,
 139 +       },
 140 +       .remove = __exit_p(w1_gpio_remove),
 141 +};
 142 +
 143 +static int __init w1_gpio_init(void)
 144 +{
 145 +       return platform_driver_probe(&w1_gpio_driver, w1_gpio_probe);
 146 +}
 147 +
 148 +static void __exit w1_gpio_exit(void)
 149 +{
 150 +       platform_driver_unregister(&w1_gpio_driver);
 151 +}
 152 +
 153 +module_init(w1_gpio_init);
 154 +module_exit(w1_gpio_exit);
 155 +
 156 +MODULE_DESCRIPTION("GPIO w1 bus master driver");
 157 +MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
 158 +MODULE_LICENSE("GPL");
 159 Index: linux-2.6.23.17/include/linux/w1-gpio.h
 160 ===================================================================
 161 --- /dev/null
 162 +++ linux-2.6.23.17/include/linux/w1-gpio.h
 163 @@ -0,0 +1,23 @@
 164 +/*
 165 + * w1-gpio interface to platform code
 166 + *
 167 + * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
 168 + *
 169 + * This program is free software; you can redistribute it and/or modify
 170 + * it under the terms of the GNU General Public License version 2
 171 + * as published by the Free Software Foundation.
 172 + */
 173 +#ifndef _LINUX_W1_GPIO_H
 174 +#define _LINUX_W1_GPIO_H
 175 +
 176 +/**
 177 + * struct w1_gpio_platform_data - Platform-dependent data for w1-gpio
 178 + * @pin: GPIO pin to use
 179 + * @is_open_drain: GPIO pin is configured as open drain
 180 + */
 181 +struct w1_gpio_platform_data {
 182 +       unsigned int pin;
 183 +       unsigned int is_open_drain:1;
 184 +};
 185 +
 186 +#endif /* _LINUX_W1_GPIO_H */