misc: nct: error handling for no regulator
[linux-2.6.git] / drivers / misc / wl127x-rfkill.c
1 /*
2  * Bluetooth TI wl127x rfkill power control via GPIO
3  *
4  * Copyright (C) 2009 Motorola, Inc.
5  * Copyright (C) 2008 Texas Instruments
6  * Initial code: Pavan Savoy <pavan.savoy@gmail.com> (wl127x_power.c)
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  *
22  */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/gpio.h>
27 #include <linux/rfkill.h>
28 #include <linux/platform_device.h>
29 #include <linux/wl127x-rfkill.h>
30
31 static int wl127x_rfkill_set_power(void *data, enum rfkill_state state)
32 {
33         int nshutdown_gpio = (int) data;
34
35         switch (state) {
36         case RFKILL_STATE_UNBLOCKED:
37                 gpio_set_value(nshutdown_gpio, 1);
38                 break;
39         case RFKILL_STATE_SOFT_BLOCKED:
40                 gpio_set_value(nshutdown_gpio, 0);
41                 break;
42         default:
43                 printk(KERN_ERR "invalid bluetooth rfkill state %d\n", state);
44         }
45         return 0;
46 }
47
48 static int wl127x_rfkill_probe(struct platform_device *pdev)
49 {
50         int rc = 0;
51         struct wl127x_rfkill_platform_data *pdata = pdev->dev.platform_data;
52         enum rfkill_state default_state = RFKILL_STATE_SOFT_BLOCKED;  /* off */
53
54         rc = gpio_request(pdata->nshutdown_gpio, "wl127x_nshutdown_gpio");
55         if (unlikely(rc))
56                 return rc;
57
58         rc = gpio_direction_output(pdata->nshutdown_gpio, 0);
59         if (unlikely(rc))
60                 return rc;
61
62         rfkill_set_default(RFKILL_TYPE_BLUETOOTH, default_state);
63         wl127x_rfkill_set_power(NULL, default_state);
64
65         pdata->rfkill = rfkill_allocate(&pdev->dev, RFKILL_TYPE_BLUETOOTH);
66         if (unlikely(!pdata->rfkill))
67                 return -ENOMEM;
68
69         pdata->rfkill->name = "wl127x";
70         pdata->rfkill->state = default_state;
71         /* userspace cannot take exclusive control */
72         pdata->rfkill->user_claim_unsupported = 1;
73         pdata->rfkill->user_claim = 0;
74         pdata->rfkill->data = (void *) pdata->nshutdown_gpio;
75         pdata->rfkill->toggle_radio = wl127x_rfkill_set_power;
76
77         rc = rfkill_register(pdata->rfkill);
78
79         if (unlikely(rc))
80                 rfkill_free(pdata->rfkill);
81
82         return 0;
83 }
84
85 static int wl127x_rfkill_remove(struct platform_device *pdev)
86 {
87         struct wl127x_rfkill_platform_data *pdata = pdev->dev.platform_data;
88
89         rfkill_unregister(pdata->rfkill);
90         rfkill_free(pdata->rfkill);
91         gpio_free(pdata->nshutdown_gpio);
92
93         return 0;
94 }
95
96 static struct platform_driver wl127x_rfkill_platform_driver = {
97         .probe = wl127x_rfkill_probe,
98         .remove = wl127x_rfkill_remove,
99         .driver = {
100                    .name = "wl127x-rfkill",
101                    .owner = THIS_MODULE,
102                    },
103 };
104
105 static int __init wl127x_rfkill_init(void)
106 {
107         return platform_driver_register(&wl127x_rfkill_platform_driver);
108 }
109
110 static void __exit wl127x_rfkill_exit(void)
111 {
112         platform_driver_unregister(&wl127x_rfkill_platform_driver);
113 }
114
115 module_init(wl127x_rfkill_init);
116 module_exit(wl127x_rfkill_exit);
117
118 MODULE_ALIAS("platform:wl127x");
119 MODULE_DESCRIPTION("wl127x-rfkill");
120 MODULE_AUTHOR("Motorola");
121 MODULE_LICENSE("GPL");