LXR linux/arch/arm/mach-s3c2410/h1940-bluetooth.c

   1/*
   2 * arch/arm/mach-s3c2410/h1940-bluetooth.c
   3 * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
   4 *
   5 * This file is subject to the terms and conditions of the GNU General Public
   6 * License.  See the file COPYING in the main directory of this archive for
   7 * more details.
   8 *
   9 *          S3C2410 bluetooth "driver"
  10 *
  11 */
  12
  13#include <linux/module.h>
  14#include <linux/platform_device.h>
  15#include <linux/delay.h>
  16#include <linux/string.h>
  17#include <linux/ctype.h>
  18#include <linux/leds.h>
  19#include <asm/arch/regs-gpio.h>
  20#include <asm/hardware.h>
  21#include <asm/arch/h1940-latch.h>
  22
  23#define DRV_NAME              "h1940-bt"
  24
  25#ifdef CONFIG_LEDS_H1940
  26DEFINE_LED_TRIGGER(bt_led_trigger);
  27#endif
  28
  29static int state;
  30
  31/* Bluetooth control */
  32static void h1940bt_enable(int on)
  33{
  34        if (on) {
  35#ifdef CONFIG_LEDS_H1940
  36                /* flashing Blue */
  37                led_trigger_event(bt_led_trigger, LED_HALF);
  38#endif
  39
  40                /* Power on the chip */
  41                h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
  42                /* Reset the chip */
  43                mdelay(10);
  44                s3c2410_gpio_setpin(S3C2410_GPH1, 1);
  45                mdelay(10);
  46                s3c2410_gpio_setpin(S3C2410_GPH1, 0);
  47
  48                state = 1;
  49        }
  50        else {
  51#ifdef CONFIG_LEDS_H1940
  52                led_trigger_event(bt_led_trigger, 0);
  53#endif
  54
  55                s3c2410_gpio_setpin(S3C2410_GPH1, 1);
  56                mdelay(10);
  57                s3c2410_gpio_setpin(S3C2410_GPH1, 0);
  58                mdelay(10);
  59                h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
  60
  61                state = 0;
  62        }
  63}
  64
  65static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
  66{
  67        return snprintf(buf, PAGE_SIZE, "%d\n", state);
  68}
  69
  70static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  71{
  72        int new_state;
  73        char *endp;
  74
  75        new_state = simple_strtoul(buf, &endp, 0);
  76        if (*endp && !isspace(*endp))
  77                return -EINVAL;
  78
  79        h1940bt_enable(new_state);
  80
  81        return count;
  82}
  83static DEVICE_ATTR(enable, 0644,
  84                h1940bt_show,
  85                h1940bt_store);
  86
  87static int __init h1940bt_probe(struct platform_device *pdev)
  88{
  89        /* Configures BT serial port GPIOs */
  90        s3c2410_gpio_cfgpin(S3C2410_GPH0, S3C2410_GPH0_nCTS0);
  91        s3c2410_gpio_pullup(S3C2410_GPH0, 1);
  92        s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
  93        s3c2410_gpio_pullup(S3C2410_GPH1, 1);
  94        s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
  95        s3c2410_gpio_pullup(S3C2410_GPH2, 1);
  96        s3c2410_gpio_cfgpin(S3C2410_GPH3, S3C2410_GPH3_RXD0);
  97        s3c2410_gpio_pullup(S3C2410_GPH3, 1);
  98
  99#ifdef CONFIG_LEDS_H1940
 100        led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
 101#endif
 102
 103        /* disable BT by default */
 104        h1940bt_enable(0);
 105
 106        return device_create_file(&pdev->dev, &dev_attr_enable);
 107}
 108
 109static int h1940bt_remove(struct platform_device *pdev)
 110{
 111#ifdef CONFIG_LEDS_H1940
 112        led_trigger_unregister_simple(bt_led_trigger);
 113#endif
 114        return 0;
 115}
 116
 117
 118static struct platform_driver h1940bt_driver = {
 119        .driver         = {
 120                .name   = DRV_NAME,
 121        },
 122        .probe          = h1940bt_probe,
 123        .remove         = h1940bt_remove,
 124};
 125
 126
 127static int __init h1940bt_init(void)
 128{
 129        return platform_driver_register(&h1940bt_driver);
 130}
 131
 132static void __exit h1940bt_exit(void)
 133{
 134        platform_driver_unregister(&h1940bt_driver);
 135}
 136
 137module_init(h1940bt_init);
 138module_exit(h1940bt_exit);
 139
 140MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 141MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 142MODULE_LICENSE("GPL");
 143