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
  26 DEFINE_LED_TRIGGER(bt_led_trigger);
  27 #endif
  28
  29 static int state;
  30
  31 /* Bluetooth control */
  32 static 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
  65 static 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
  70 static 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 }
  83 static DEVICE_ATTR(enable, 0644,
  84                 h1940bt_show,
  85                 h1940bt_store);
  86
  87 static 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
 109 static 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
 118 static struct platform_driver h1940bt_driver = {
 119         .driver         = {
 120                 .name   = DRV_NAME,
 121         },
 122         .probe          = h1940bt_probe,
 123         .remove         = h1940bt_remove,
 124 };
 125
 126
 127 static int __init h1940bt_init(void)
 128 {
 129         return platform_driver_register(&h1940bt_driver);
 130 }
 131
 132 static void __exit h1940bt_exit(void)
 133 {
 134         platform_driver_unregister(&h1940bt_driver);
 135 }
 136
 137 module_init(h1940bt_init);
 138 module_exit(h1940bt_exit);
 139
 140 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 141 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 142 MODULE_LICENSE("GPL");