diff options
Diffstat (limited to 'arch/arm/plat-s3c24xx/gta02_pm_wlan.c')
| -rw-r--r-- | arch/arm/plat-s3c24xx/gta02_pm_wlan.c | 126 |
1 files changed, 123 insertions, 3 deletions
diff --git a/arch/arm/plat-s3c24xx/gta02_pm_wlan.c b/arch/arm/plat-s3c24xx/gta02_pm_wlan.c index 3a0d24079da..419b3f77403 100644 --- a/arch/arm/plat-s3c24xx/gta02_pm_wlan.c +++ b/arch/arm/plat-s3c24xx/gta02_pm_wlan.c @@ -1,7 +1,7 @@ /* * GTA02 WLAN power management * - * (C) 2008 by Openmoko Inc. + * (C) 2008, 2009 by Openmoko Inc. * Author: Andy Green <andy@openmoko.com> * All rights reserved. * @@ -27,6 +27,10 @@ #include <mach/regs-gpioj.h> #include <linux/delay.h> +#include <linux/rfkill.h> + + +/* ----- Module hardware reset ("power") ----------------------------------- */ static void __gta02_wlan_power(int on) @@ -109,10 +113,94 @@ static struct attribute_group gta02_wlan_attr_group = { .attrs = gta02_wlan_sysfs_entries, }; + +/* ----- rfkill ------------------------------------------------------------ */ + +/* + * S3C MCI handles suspend/resume through device removal/insertion. In order to + * preserve rfkill state, as required in clause 7 of section 3.1 in rfkill.txt, + * we therefore need to maintain rfkill state outside the driver. + * + * This platform driver is as good a place as any other. + */ + +static int (*gta02_wlan_rfkill_cb)(void *user, int on); +static void *gta02_wlan_rfkill_user; +static DEFINE_MUTEX(gta02_wlan_rfkill_lock); +static int gta02_wlan_rfkill_on; + + +/* + * gta02_wlan_query_rfkill_lock is used to obtain the rfkill state before the + * driver is ready to process rfkill callbacks. To prevent the state from + * changing until the driver has completed its initialization, we grab and hold + * the rfkill lock. + * + * A call to gta02_wlan_query_rfkill_lock must be followed by either + * - a call to gta02_wlan_set_rfkill_cb, to complete the setup, or + * - a call to gta02_wlan_query_rfkill_unlock to abort the setup process. + */ + +int gta02_wlan_query_rfkill_lock(void) +{ + mutex_lock(>a02_wlan_rfkill_lock); + return gta02_wlan_rfkill_on; +} +EXPORT_SYMBOL_GPL(gta02_wlan_query_rfkill_lock); + +void gta02_wlan_query_rfkill_unlock(void) +{ + mutex_unlock(>a02_wlan_rfkill_lock); +} +EXPORT_SYMBOL_GPL(gta02_wlan_query_rfkill_unlock); + + +void gta02_wlan_set_rfkill_cb(int (*cb)(void *user, int on), void *user) +{ + BUG_ON(!mutex_is_locked(>a02_wlan_rfkill_lock)); + BUG_ON(gta02_wlan_rfkill_cb); + gta02_wlan_rfkill_cb = cb; + gta02_wlan_rfkill_user = user; + mutex_unlock(>a02_wlan_rfkill_lock); +} +EXPORT_SYMBOL_GPL(gta02_wlan_set_rfkill_cb); + +void gta02_wlan_clear_rfkill_cb(void) +{ + mutex_lock(>a02_wlan_rfkill_lock); + BUG_ON(!gta02_wlan_rfkill_cb); + gta02_wlan_rfkill_cb = NULL; + mutex_unlock(>a02_wlan_rfkill_lock); +} +EXPORT_SYMBOL_GPL(gta02_wlan_clear_rfkill_cb); + +static int gta02_wlan_toggle_radio(void *data, enum rfkill_state state) +{ + struct device *dev = data; + int on = state == RFKILL_STATE_UNBLOCKED; + int res = 0; + + dev_dbg(dev, "gta02_wlan_toggle_radio: state %d (%p)\n", + state, gta02_wlan_rfkill_cb); + mutex_lock(>a02_wlan_rfkill_lock); + if (gta02_wlan_rfkill_cb) + res = gta02_wlan_rfkill_cb(gta02_wlan_rfkill_user, on); + if (!res) + gta02_wlan_rfkill_on = on; + mutex_unlock(>a02_wlan_rfkill_lock); + return res; +} + + +/* ----- Initialization/removal -------------------------------------------- */ + + static int __init gta02_wlan_probe(struct platform_device *pdev) { /* default-on for now */ const int default_state = 1; + struct rfkill *rfkill; + int error; if (!machine_is_neo1973_gta02()) return -EINVAL; @@ -121,13 +209,45 @@ static int __init gta02_wlan_probe(struct platform_device *pdev) s3c2410_gpio_cfgpin(GTA02_CHIP_PWD, S3C2410_GPIO_OUTPUT); s3c2410_gpio_cfgpin(GTA02_GPIO_nWLAN_RESET, S3C2410_GPIO_OUTPUT); - gta02_wlan_power(default_state); + gta02_wlan_power(1); + + rfkill = rfkill_allocate(&pdev->dev, RFKILL_TYPE_WLAN); + rfkill->name = "ar6000"; + rfkill->data = &pdev->dev; + rfkill->state = default_state ? RFKILL_STATE_ON : RFKILL_STATE_OFF; + /* + * If the WLAN driver somehow managed to get activated before we're + * ready, the driver is now in an unknown state, which isn't something + * we're prepared to handle. This can't happen, so just fail hard. + */ + BUG_ON(gta02_wlan_rfkill_cb); + gta02_wlan_rfkill_on = default_state; + rfkill->toggle_radio = gta02_wlan_toggle_radio; + + error = rfkill_register(rfkill); + if (error) { + rfkill_free(rfkill); + return error; + } + + error = sysfs_create_group(&pdev->dev.kobj, >a02_wlan_attr_group); + if (error) { + rfkill_free(rfkill); + return error; + } + + dev_set_drvdata(&pdev->dev, rfkill); - return sysfs_create_group(&pdev->dev.kobj, >a02_wlan_attr_group); + return 0; } static int gta02_wlan_remove(struct platform_device *pdev) { + struct rfkill *rfkill = dev_get_drvdata(&pdev->dev); + + rfkill_unregister(rfkill); + rfkill_free(rfkill); + sysfs_remove_group(&pdev->dev.kobj, >a02_wlan_attr_group); return 0; |