arch/arm/mach-pxa/hx4700/hx4700_bt.c

   1 /* Bluetooth interface driver for TI BRF6150 on HX4700
   2  *
   3  * Copyright (c) 2005 SDG Systems, LLC
   4  *
   5  * 2005-04-21   Todd Blumer             Created.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/delay.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/fs.h>
  13 #include <linux/leds.h>
  14
  15 #include <asm/hardware.h>
  16 #include <asm/arch/serial.h>
  17 #include <asm/arch/hx4700-gpio.h>
  18 #include <asm/arch/hx4700-core.h>
  19
  20 #include "hx4700_bt.h"
  21
  22 static void
  23 hx4700_bt_configure( int state )
  24 {
  25         int tries;
  26
  27         // printk( KERN_NOTICE "hx4700 configure bluetooth: %d\n", state );
  28         switch (state) {
  29
  30         case PXA_UART_CFG_PRE_STARTUP:
  31                 break;
  32
  33         case PXA_UART_CFG_POST_STARTUP:
  34                 /* pre-serial-up hardware configuration */
  35                 hx4700_egpio_enable( EGPIO5_BT_3V3_ON );
  36                 SET_HX4700_GPIO( CPU_BT_RESET_N, 0 );
  37                 mdelay(1);
  38                 SET_HX4700_GPIO( CPU_BT_RESET_N, 1 );
  39
  40                 /*
  41                  * BRF6150's RTS goes low when firmware is ready
  42                  * so check for CTS=1 (nCTS=0 -> CTS=1). Typical 150ms
  43                  */
  44                 tries = 0;
  45                 do {
  46                         mdelay(10);
  47                 } while ((BTMSR & MSR_CTS) == 0 && tries++ < 50);
  48                 led_trigger_event_shared(hx4700_radio_trig, LED_FULL);
  49                 break;
  50
  51         case PXA_UART_CFG_PRE_SHUTDOWN:
  52                 hx4700_egpio_disable( EGPIO5_BT_3V3_ON );
  53                 mdelay(1);
  54                 led_trigger_event_shared(hx4700_radio_trig, LED_OFF);
  55                 break;
  56
  57         default:
  58                 break;
  59         }
  60 }
  61
  62
  63 static int
  64 hx4700_bt_probe( struct platform_device *pdev )
  65 {
  66         struct hx4700_bt_funcs *funcs = pdev->dev.platform_data;
  67
  68         /* configure bluetooth UART */
  69         pxa_gpio_mode( GPIO_NR_HX4700_BT_RXD_MD );
  70         pxa_gpio_mode( GPIO_NR_HX4700_BT_TXD_MD );
  71         pxa_gpio_mode( GPIO_NR_HX4700_BT_UART_CTS_MD );
  72         pxa_gpio_mode( GPIO_NR_HX4700_BT_UART_RTS_MD );
  73
  74         funcs->configure = hx4700_bt_configure;
  75
  76         return 0;
  77 }
  78
  79 static int
  80 hx4700_bt_remove( struct platform_device *pdev )
  81 {
  82         struct hx4700_bt_funcs *funcs = pdev->dev.platform_data;
  83
  84         funcs->configure = NULL;
  85
  86         return 0;
  87 }
  88
  89 static struct platform_driver bt_driver = {
  90         .driver = {
  91                 .name     = "hx4700-bt",
  92         },
  93         .probe    = hx4700_bt_probe,
  94         .remove   = hx4700_bt_remove,
  95 };
  96
  97 static int __init
  98 hx4700_bt_init( void )
  99 {
 100         printk(KERN_NOTICE "hx4700 Bluetooth Driver\n");
 101         return platform_driver_register( &bt_driver );
 102 }
 103
 104 static void __exit
 105 hx4700_bt_exit( void )
 106 {
 107         platform_driver_unregister( &bt_driver );
 108 }
 109
 110 module_init( hx4700_bt_init );
 111 module_exit( hx4700_bt_exit );
 112
 113 MODULE_AUTHOR("Todd Blumer, SDG Systems, LLC");
 114 MODULE_DESCRIPTION("hx4700 Bluetooth Support Driver");
 115 MODULE_LICENSE("GPL");
 116
 117 /* vim600: set noexpandtab sw=8 ts=8 :*/
 118