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 <linux/gpio.h>
  20
  21#include <mach/regs-gpio.h>
  22#include <mach/hardware.h>
  23#include <mach/h1940-latch.h>
  24
  25#define DRV_NAME              "h1940-bt"
  26
  27#ifdef CONFIG_LEDS_H1940
  28DEFINE_LED_TRIGGER(bt_led_trigger);
  29#endif
  30
  31static int state;
  32
  33/* Bluetooth control */
  34static void h1940bt_enable(int on)
  35{
  36        if (on) {
  37#ifdef CONFIG_LEDS_H1940
  38                /* flashing Blue */
  39                led_trigger_event(bt_led_trigger, LED_HALF);
  40#endif
  41
  42                /* Power on the chip */
  43                h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
  44                /* Reset the chip */
  45                mdelay(10);
  46                s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
  47                mdelay(10);
  48                s3c2410_gpio_setpin(S3C2410_GPH(1), 0);
  49
  50                state = 1;
  51        }
  52        else {
  53#ifdef CONFIG_LEDS_H1940
  54                led_trigger_event(bt_led_trigger, 0);
  55#endif
  56
  57                s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
  58                mdelay(10);
  59                s3c2410_gpio_setpin(S3C2410_GPH(1), 0);
  60                mdelay(10);
  61                h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
  62
  63                state = 0;
  64        }
  65}
  66
  67static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
  68{
  69        return snprintf(buf, PAGE_SIZE, "%d\n", state);
  70}
  71
  72static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  73{
  74        int new_state;
  75        char *endp;
  76
  77        new_state = simple_strtoul(buf, &endp, 0);
  78        if (*endp && !isspace(*endp))
  79                return -EINVAL;
  80
  81        h1940bt_enable(new_state);
  82
  83        return count;
  84}
  85static DEVICE_ATTR(enable, 0644,
  86                h1940bt_show,
  87                h1940bt_store);
  88
  89static int __init h1940bt_probe(struct platform_device *pdev)
  90{
  91        /* Configures BT serial port GPIOs */
  92        s3c2410_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  93        s3c2410_gpio_pullup(S3C2410_GPH(0), 1);
  94        s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  95        s3c2410_gpio_pullup(S3C2410_GPH(1), 1);
  96        s3c2410_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  97        s3c2410_gpio_pullup(S3C2410_GPH(2), 1);
  98        s3c2410_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  99        s3c2410_gpio_pullup(S3C2410_GPH(3), 1);
 100
 101#ifdef CONFIG_LEDS_H1940
 102        led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
 103#endif
 104
 105        /* disable BT by default */
 106        h1940bt_enable(0);
 107
 108        return device_create_file(&pdev->dev, &dev_attr_enable);
 109}
 110
 111static int h1940bt_remove(struct platform_device *pdev)
 112{
 113#ifdef CONFIG_LEDS_H1940
 114        led_trigger_unregister_simple(bt_led_trigger);
 115#endif
 116        return 0;
 117}
 118
 119
 120static struct platform_driver h1940bt_driver = {
 121        .driver         = {
 122                .name   = DRV_NAME,
 123        },
 124        .probe          = h1940bt_probe,
 125        .remove         = h1940bt_remove,
 126};
 127
 128
 129static int __init h1940bt_init(void)
 130{
 131        return platform_driver_register(&h1940bt_driver);
 132}
 133
 134static void __exit h1940bt_exit(void)
 135{
 136        platform_driver_unregister(&h1940bt_driver);
 137}
 138
 139module_init(h1940bt_init);
 140module_exit(h1940bt_exit);
 141
 142MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 143MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 144MODULE_LICENSE("GPL");
 145