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
  28 DEFINE_LED_TRIGGER(bt_led_trigger);
  29 #endif
  30
  31 static int state;
  32
  33 /* Bluetooth control */
  34 static 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
  67 static 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
  72 static 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 }
  85 static DEVICE_ATTR(enable, 0644,
  86                 h1940bt_show,
  87                 h1940bt_store);
  88
  89 static 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
 111 static 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
 120 static struct platform_driver h1940bt_driver = {
 121         .driver         = {
 122                 .name   = DRV_NAME,
 123         },
 124         .probe          = h1940bt_probe,
 125         .remove         = h1940bt_remove,
 126 };
 127
 128
 129 static int __init h1940bt_init(void)
 130 {
 131         return platform_driver_register(&h1940bt_driver);
 132 }
 133
 134 static void __exit h1940bt_exit(void)
 135 {
 136         platform_driver_unregister(&h1940bt_driver);
 137 }
 138
 139 module_init(h1940bt_init);
 140 module_exit(h1940bt_exit);
 141
 142 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 143 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 144 MODULE_LICENSE("GPL");