arch/arm/mach-pxa/tosa-bt.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Bluetooth built-in chip control
   4  *
   5  * Copyright (c) 2008 Dmitry Baryshkov
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/gpio.h>
  12 #include <linux/delay.h>
  13 #include <linux/rfkill.h>
  14
  15 #include "tosa_bt.h"
  16
  17 static void tosa_bt_on(struct tosa_bt_data *data)
  18 {
  19         gpio_set_value(data->gpio_reset, 0);
  20         gpio_set_value(data->gpio_pwr, 1);
  21         gpio_set_value(data->gpio_reset, 1);
  22         mdelay(20);
  23         gpio_set_value(data->gpio_reset, 0);
  24 }
  25
  26 static void tosa_bt_off(struct tosa_bt_data *data)
  27 {
  28         gpio_set_value(data->gpio_reset, 1);
  29         mdelay(10);
  30         gpio_set_value(data->gpio_pwr, 0);
  31         gpio_set_value(data->gpio_reset, 0);
  32 }
  33
  34 static int tosa_bt_set_block(void *data, bool blocked)
  35 {
  36         pr_info("BT_RADIO going: %s\n", blocked ? "off" : "on");
  37
  38         if (!blocked) {
  39                 pr_info("TOSA_BT: going ON\n");
  40                 tosa_bt_on(data);
  41         } else {
  42                 pr_info("TOSA_BT: going OFF\n");
  43                 tosa_bt_off(data);
  44         }
  45
  46         return 0;
  47 }
  48
  49 static const struct rfkill_ops tosa_bt_rfkill_ops = {
  50         .set_block = tosa_bt_set_block,
  51 };
  52
  53 static int tosa_bt_probe(struct platform_device *dev)
  54 {
  55         int rc;
  56         struct rfkill *rfk;
  57
  58         struct tosa_bt_data *data = dev->dev.platform_data;
  59
  60         rc = gpio_request(data->gpio_reset, "Bluetooth reset");
  61         if (rc)
  62                 goto err_reset;
  63         rc = gpio_direction_output(data->gpio_reset, 0);
  64         if (rc)
  65                 goto err_reset_dir;
  66         rc = gpio_request(data->gpio_pwr, "Bluetooth power");
  67         if (rc)
  68                 goto err_pwr;
  69         rc = gpio_direction_output(data->gpio_pwr, 0);
  70         if (rc)
  71                 goto err_pwr_dir;
  72
  73         rfk = rfkill_alloc("tosa-bt", &dev->dev, RFKILL_TYPE_BLUETOOTH,
  74                            &tosa_bt_rfkill_ops, data);
  75         if (!rfk) {
  76                 rc = -ENOMEM;
  77                 goto err_rfk_alloc;
  78         }
  79
  80         rc = rfkill_register(rfk);
  81         if (rc)
  82                 goto err_rfkill;
  83
  84         platform_set_drvdata(dev, rfk);
  85
  86         return 0;
  87
  88 err_rfkill:
  89         rfkill_destroy(rfk);
  90 err_rfk_alloc:
  91         tosa_bt_off(data);
  92 err_pwr_dir:
  93         gpio_free(data->gpio_pwr);
  94 err_pwr:
  95 err_reset_dir:
  96         gpio_free(data->gpio_reset);
  97 err_reset:
  98         return rc;
  99 }
 100
 101 static int tosa_bt_remove(struct platform_device *dev)
 102 {
 103         struct tosa_bt_data *data = dev->dev.platform_data;
 104         struct rfkill *rfk = platform_get_drvdata(dev);
 105
 106         platform_set_drvdata(dev, NULL);
 107
 108         if (rfk) {
 109                 rfkill_unregister(rfk);
 110                 rfkill_destroy(rfk);
 111         }
 112         rfk = NULL;
 113
 114         tosa_bt_off(data);
 115
 116         gpio_free(data->gpio_pwr);
 117         gpio_free(data->gpio_reset);
 118
 119         return 0;
 120 }
 121
 122 static struct platform_driver tosa_bt_driver = {
 123         .probe = tosa_bt_probe,
 124         .remove = tosa_bt_remove,
 125
 126         .driver = {
 127                 .name = "tosa-bt",
 128         },
 129 };
 130 module_platform_driver(tosa_bt_driver);
 131
 132 MODULE_LICENSE("GPL");
 133 MODULE_AUTHOR("Dmitry Baryshkov");
 134 MODULE_DESCRIPTION("Bluetooth built-in chip control");