diff options
| author | Zhang Jiejing <jiejing.zhang@freescale.com> | 2011-04-06 13:05:20 +0800 |
|---|---|---|
| committer | Zhang Jiejing <jiejing.zhang@freescale.com> | 2011-04-06 13:09:23 +0800 |
| commit | 74362fa3d1057ba1975e52191fcd22bb7c2a6d3b (patch) | |
| tree | 1b20a2a321c68cf7f52311fb3c92082f2012400e /arch | |
| parent | 44dd20d75fd807cb26f951e535773e6d8dabd2fd (diff) | |
ENGR00141652 MX53_SMD: BT: don't reset BT chip during system suspend & resume.
Bluez stack layer will call rfkill to enable/disable BT chip.
This will cause AR3001 chip reset during resume, bluez layer
need to re-init all the BT stuff.
Add this code to let BT not reset during suspend/resume.
Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-mx5/mx53_smd_rfkill.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm/mach-mx5/mx53_smd_rfkill.c b/arch/arm/mach-mx5/mx53_smd_rfkill.c index f0f95a839381..f669dd0acd06 100644 --- a/arch/arm/mach-mx5/mx53_smd_rfkill.c +++ b/arch/arm/mach-mx5/mx53_smd_rfkill.c @@ -30,16 +30,24 @@ #include <linux/platform_device.h> #include <linux/device.h> #include <linux/kernel.h> +#include <linux/suspend.h> #include <linux/init.h> #include <linux/rfkill.h> #include <mach/hardware.h> #include <mach/mxc_rfkill.h> +static int system_in_suspend; + static int mxc_bt_set_block(void *rfkdata, bool blocked) { struct mxc_bt_rfkill_platform_data *data = rfkdata; int ret; + /* Bluetooth stack will reset the bluetooth chip during + * resume, since we keep bluetooth's power during suspend, + * don't let rfkill to actually reset the chip. */ + if (system_in_suspend) + return 0; pr_info("rfkill: BT RF going to : %s\n", blocked ? "off" : "on"); if (!blocked) ret = data->power_change(1); @@ -53,6 +61,28 @@ static const struct rfkill_ops mxc_bt_rfkill_ops = { .set_block = mxc_bt_set_block, }; +static int mxc_bt_power_event(struct notifier_block *this, + unsigned long event, void *dummy) +{ + switch (event) { + case PM_SUSPEND_PREPARE: + system_in_suspend = 1; + /* going to suspend, don't reset chip */ + break; + case PM_POST_SUSPEND: + system_in_suspend = 0; + /* System is resume, can reset chip */ + break; + default: + break; + } + return NOTIFY_DONE; +} + +static struct notifier_block mxc_bt_power_notifier = { + .notifier_call = mxc_bt_power_event, +}; + static int mxc_bt_rfkill_probe(struct platform_device *dev) { int rc; @@ -66,6 +96,10 @@ static int mxc_bt_rfkill_probe(struct platform_device *dev) goto error_check_func; } + rc = register_pm_notifier(&mxc_bt_power_notifier); + if (rc) + goto error_check_func; + rfk = rfkill_alloc("mxc-bt", &dev->dev, RFKILL_TYPE_BLUETOOTH, &mxc_bt_rfkill_ops, data); |