From fb189822fcab111e55d1c7e83c482dc2c144500a Mon Sep 17 00:00:00 2001 From: lars Date: Mon, 18 May 2009 17:55:41 +0000 Subject: [s3c24xx] bump to 2.6.30-rc6 git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15918 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../arch/arm/mach-s3c2442/gta02-pm-wlan.c | 195 +++++++++++++++++++++ 1 file changed, 195 insertions(+) create mode 100644 target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-wlan.c (limited to 'target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-wlan.c') diff --git a/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-wlan.c b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-wlan.c new file mode 100644 index 000000000..5f2b159ed --- /dev/null +++ b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-wlan.c @@ -0,0 +1,195 @@ +/* + * GTA02 WLAN power management + * + * (C) 2008, 2009 by Openmoko Inc. + * Author: Andy Green + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation + * + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include + +#include +#include + + +/* ----- Module hardware reset ("power") ----------------------------------- */ + + +void gta02_wlan_reset(int assert_reset) +{ + if (assert_reset) { + s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0); + msleep(200); /* probably excessive but we don't have specs */ + } else { + s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 1); + } +} + +/* ----- 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; + + dev_info(&pdev->dev, "starting\n"); + + s3c2410_gpio_cfgpin(GTA02_GPIO_nWLAN_RESET, S3C2410_GPIO_OUTPUT); + gta02_wlan_reset(1); + gta02_wlan_reset(0); + + 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; + } + + dev_set_drvdata(&pdev->dev, rfkill); + + 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); + + return 0; +} + +static struct platform_driver gta02_wlan_driver = { + .probe = gta02_wlan_probe, + .remove = gta02_wlan_remove, + .driver = { + .name = "gta02-pm-wlan", + }, +}; + +static int __devinit gta02_wlan_init(void) +{ + return platform_driver_register(>a02_wlan_driver); +} + +static void gta02_wlan_exit(void) +{ + platform_driver_unregister(>a02_wlan_driver); +} + +module_init(gta02_wlan_init); +module_exit(gta02_wlan_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Andy Green "); +MODULE_DESCRIPTION("Openmoko GTA02 WLAN power management"); -- cgit v1.2.3