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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2009-01-11 03:01:02 -0200
committerLen Brown <len.brown@intel.com>2009-01-15 13:36:25 -0500
commit90d9d3c79c44bcf95bc487e9bbceaff2de370310 (patch)
tree3cb097801f97c106bef5cc743db86bc665a15ccb /drivers
parent153f82207c51193e4d6a7e6f0e3f9442eabeba1c (diff)
ACPI: thinkpad-acpi: preserve radio state across shutdown
Store in firmware NVRAM the radio state on machine shutdown for WWAN and bluetooth. Also, try to set the initial boot state of these radios as the rfkill default state for their respective classes. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c59
1 files changed, 55 insertions, 4 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index b2c5913ff72..27d709bac98 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -222,6 +222,7 @@ struct ibm_struct {
void (*exit) (void);
void (*resume) (void);
void (*suspend) (pm_message_t state);
+ void (*shutdown) (void);
struct list_head all_drivers;
@@ -759,6 +760,18 @@ static int tpacpi_resume_handler(struct platform_device *pdev)
return 0;
}
+static void tpacpi_shutdown_handler(struct platform_device *pdev)
+{
+ struct ibm_struct *ibm, *itmp;
+
+ list_for_each_entry_safe(ibm, itmp,
+ &tpacpi_all_drivers,
+ all_drivers) {
+ if (ibm->shutdown)
+ (ibm->shutdown)();
+ }
+}
+
static struct platform_driver tpacpi_pdriver = {
.driver = {
.name = TPACPI_DRVR_NAME,
@@ -766,6 +779,7 @@ static struct platform_driver tpacpi_pdriver = {
},
.suspend = tpacpi_suspend_handler,
.resume = tpacpi_resume_handler,
+ .shutdown = tpacpi_shutdown_handler,
};
static struct platform_driver tpacpi_hwmon_pdriver = {
@@ -957,7 +971,22 @@ static int __init tpacpi_new_rfkill(const unsigned int id,
int (*get_state)(void *, enum rfkill_state *))
{
int res;
- enum rfkill_state initial_state;
+ enum rfkill_state initial_state = RFKILL_STATE_SOFT_BLOCKED;
+
+ res = get_state(NULL, &initial_state);
+ if (res < 0) {
+ printk(TPACPI_ERR
+ "failed to read initial state for %s, error %d; "
+ "will turn radio off\n", name, res);
+ } else {
+ /* try to set the initial state as the default for the rfkill
+ * type, since we ask the firmware to preserve it across S5 in
+ * NVRAM */
+ rfkill_set_default(rfktype,
+ (initial_state == RFKILL_STATE_UNBLOCKED) ?
+ RFKILL_STATE_UNBLOCKED :
+ RFKILL_STATE_SOFT_BLOCKED);
+ }
*rfk = rfkill_allocate(&tpacpi_pdev->dev, rfktype);
if (!*rfk) {
@@ -969,9 +998,7 @@ static int __init tpacpi_new_rfkill(const unsigned int id,
(*rfk)->name = name;
(*rfk)->get_state = get_state;
(*rfk)->toggle_radio = toggle_radio;
-
- if (!get_state(NULL, &initial_state))
- (*rfk)->state = initial_state;
+ (*rfk)->state = initial_state;
res = rfkill_register(*rfk);
if (res < 0) {
@@ -2943,8 +2970,19 @@ static int tpacpi_bluetooth_rfk_set(void *data, enum rfkill_state state)
return bluetooth_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
}
+static void bluetooth_shutdown(void)
+{
+ /* Order firmware to save current state to NVRAM */
+ if (!acpi_evalf(NULL, NULL, "\\BLTH", "vd",
+ TP_ACPI_BLTH_SAVE_STATE))
+ printk(TPACPI_NOTICE
+ "failed to save bluetooth state to NVRAM\n");
+}
+
static void bluetooth_exit(void)
{
+ bluetooth_shutdown();
+
if (tpacpi_bluetooth_rfkill)
rfkill_unregister(tpacpi_bluetooth_rfkill);
@@ -3050,6 +3088,7 @@ static struct ibm_struct bluetooth_driver_data = {
.write = bluetooth_write,
.exit = bluetooth_exit,
.suspend = bluetooth_suspend,
+ .shutdown = bluetooth_shutdown,
};
/*************************************************************************
@@ -3207,8 +3246,19 @@ static int tpacpi_wan_rfk_set(void *data, enum rfkill_state state)
return wan_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
}
+static void wan_shutdown(void)
+{
+ /* Order firmware to save current state to NVRAM */
+ if (!acpi_evalf(NULL, NULL, "\\WGSV", "vd",
+ TP_ACPI_WGSV_SAVE_STATE))
+ printk(TPACPI_NOTICE
+ "failed to save WWAN state to NVRAM\n");
+}
+
static void wan_exit(void)
{
+ wan_shutdown();
+
if (tpacpi_wan_rfkill)
rfkill_unregister(tpacpi_wan_rfkill);
@@ -3312,6 +3362,7 @@ static struct ibm_struct wan_driver_data = {
.write = wan_write,
.exit = wan_exit,
.suspend = wan_suspend,
+ .shutdown = wan_shutdown,
};
/*************************************************************************