2 * GTA02 WLAN power management
4 * (C) 2008, 2009 by Openmoko Inc.
5 * Author: Andy Green <andy@openmoko.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/mutex.h>
18 #include <linux/platform_device.h>
20 #include <mach/hardware.h>
21 #include <asm/mach-types.h>
23 #include <mach/gta02.h>
24 #include <mach/gta02-pm-wlan.h>
25 #include <mach/regs-gpio.h>
26 #include <mach/regs-gpioj.h>
27 #include <mach/gpio-fns.h>
29 #include <linux/delay.h>
30 #include <linux/rfkill.h>
33 /* ----- Module hardware reset ("power") ----------------------------------- */
36 void gta02_wlan_reset(int assert_reset)
39 s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
40 msleep(200); /* probably excessive but we don't have specs */
42 s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 1);
46 /* ----- rfkill ------------------------------------------------------------ */
49 * S3C MCI handles suspend/resume through device removal/insertion. In order to
50 * preserve rfkill state, as required in clause 7 of section 3.1 in rfkill.txt,
51 * we therefore need to maintain rfkill state outside the driver.
53 * This platform driver is as good a place as any other.
56 static int (*gta02_wlan_rfkill_cb)(void *user, int on);
57 static void *gta02_wlan_rfkill_user;
58 static DEFINE_MUTEX(gta02_wlan_rfkill_lock);
59 static int gta02_wlan_rfkill_on;
62 * gta02_wlan_query_rfkill_lock is used to obtain the rfkill state before the
63 * driver is ready to process rfkill callbacks. To prevent the state from
64 * changing until the driver has completed its initialization, we grab and hold
67 * A call to gta02_wlan_query_rfkill_lock must be followed by either
68 * - a call to gta02_wlan_set_rfkill_cb, to complete the setup, or
69 * - a call to gta02_wlan_query_rfkill_unlock to abort the setup process.
72 int gta02_wlan_query_rfkill_lock(void)
74 mutex_lock(>a02_wlan_rfkill_lock);
75 return gta02_wlan_rfkill_on;
77 EXPORT_SYMBOL_GPL(gta02_wlan_query_rfkill_lock);
79 void gta02_wlan_query_rfkill_unlock(void)
81 mutex_unlock(>a02_wlan_rfkill_lock);
83 EXPORT_SYMBOL_GPL(gta02_wlan_query_rfkill_unlock);
85 void gta02_wlan_set_rfkill_cb(int (*cb)(void *user, int on), void *user)
87 BUG_ON(!mutex_is_locked(>a02_wlan_rfkill_lock));
88 BUG_ON(gta02_wlan_rfkill_cb);
89 gta02_wlan_rfkill_cb = cb;
90 gta02_wlan_rfkill_user = user;
91 mutex_unlock(>a02_wlan_rfkill_lock);
93 EXPORT_SYMBOL_GPL(gta02_wlan_set_rfkill_cb);
95 void gta02_wlan_clear_rfkill_cb(void)
97 mutex_lock(>a02_wlan_rfkill_lock);
98 BUG_ON(!gta02_wlan_rfkill_cb);
99 gta02_wlan_rfkill_cb = NULL;
100 mutex_unlock(>a02_wlan_rfkill_lock);
102 EXPORT_SYMBOL_GPL(gta02_wlan_clear_rfkill_cb);
104 static int gta02_wlan_set_radio_block(void *data, bool blocked)
106 struct device *dev = data;
109 dev_dbg(dev, "gta02_wlan_toggle_radio: blocked %d (%p)\n",
110 blocked, gta02_wlan_rfkill_cb);
111 mutex_lock(>a02_wlan_rfkill_lock);
112 if (gta02_wlan_rfkill_cb)
113 res = gta02_wlan_rfkill_cb(gta02_wlan_rfkill_user, !blocked);
115 gta02_wlan_rfkill_on = !blocked;
116 mutex_unlock(>a02_wlan_rfkill_lock);
120 static const struct rfkill_ops gta02_wlan_rfkill_ops = {
121 .set_block = gta02_wlan_set_radio_block,
124 /* ----- Initialization/removal -------------------------------------------- */
127 static int __init gta02_wlan_probe(struct platform_device *pdev)
129 /* default-on for now */
130 const int default_state = 1;
131 struct rfkill *rfkill;
134 dev_info(&pdev->dev, "starting\n");
136 s3c2410_gpio_cfgpin(GTA02_GPIO_nWLAN_RESET, S3C2410_GPIO_OUTPUT);
140 rfkill = rfkill_alloc("ar6000", &pdev->dev, RFKILL_TYPE_WLAN,
141 >a02_wlan_rfkill_ops, &pdev->dev);
145 dev_err(&pdev->dev, "Failed to allocate rfkill\n");
149 rfkill_init_sw_state(rfkill, default_state);
151 * If the WLAN driver somehow managed to get activated before we're
152 * ready, the driver is now in an unknown state, which isn't something
153 * we're prepared to handle. This can't happen, so just fail hard.
155 BUG_ON(gta02_wlan_rfkill_cb);
156 gta02_wlan_rfkill_on = default_state;
158 ret = rfkill_register(rfkill);
160 rfkill_destroy(rfkill);
161 dev_err(&pdev->dev, "Failed to register rfkill\n");
165 dev_set_drvdata(&pdev->dev, rfkill);
170 static int gta02_wlan_remove(struct platform_device *pdev)
172 struct rfkill *rfkill = dev_get_drvdata(&pdev->dev);
174 rfkill_destroy(rfkill);
179 static struct platform_driver gta02_wlan_driver = {
180 .probe = gta02_wlan_probe,
181 .remove = gta02_wlan_remove,
183 .name = "gta02-pm-wlan",
187 static int __devinit gta02_wlan_init(void)
189 return platform_driver_register(>a02_wlan_driver);
192 static void gta02_wlan_exit(void)
194 platform_driver_unregister(>a02_wlan_driver);
197 module_init(gta02_wlan_init);
198 module_exit(gta02_wlan_exit);
200 MODULE_LICENSE("GPL");
201 MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
202 MODULE_DESCRIPTION("Openmoko GTA02 WLAN power management");