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authorLinus Torvalds <torvalds@linux-foundation.org>2012-06-03 23:15:57 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-03 23:15:57 -0400
commit4d578573b8328ce5aa6500b955444b89afa3c72c (patch)
tree13b839d10dfc7e886515e2ef9e91fe7881700545
parent68e3e92620c323703bc7db75c2ba15239ee85c39 (diff)
parentdbe9a2edd17d843d80faf2b99f20a691c1853418 (diff)
Merge branch 'pm-acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull some left-over PM patches from Rafael J. Wysocki. * 'pm-acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI / PM: Make acpi_pm_device_sleep_state() follow the specification ACPI / PM: Make __acpi_bus_get_power() cover D3cold correctly ACPI / PM: Fix error messages in drivers/acpi/bus.c rtc-cmos / PM: report wakeup event on ACPI RTC alarm ACPI / PM: Generate wakeup events on fixed power button
-rw-r--r--drivers/acpi/bus.c88
-rw-r--r--drivers/acpi/power.c2
-rw-r--r--drivers/acpi/scan.c1
-rw-r--r--drivers/acpi/sleep.c49
-rw-r--r--drivers/rtc/rtc-cmos.c9
5 files changed, 110 insertions, 39 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 3188da3df8da..adceafda9c17 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -182,41 +182,66 @@ EXPORT_SYMBOL(acpi_bus_get_private_data);
182 Power Management 182 Power Management
183 -------------------------------------------------------------------------- */ 183 -------------------------------------------------------------------------- */
184 184
185static const char *state_string(int state)
186{
187 switch (state) {
188 case ACPI_STATE_D0:
189 return "D0";
190 case ACPI_STATE_D1:
191 return "D1";
192 case ACPI_STATE_D2:
193 return "D2";
194 case ACPI_STATE_D3_HOT:
195 return "D3hot";
196 case ACPI_STATE_D3_COLD:
197 return "D3";
198 default:
199 return "(unknown)";
200 }
201}
202
185static int __acpi_bus_get_power(struct acpi_device *device, int *state) 203static int __acpi_bus_get_power(struct acpi_device *device, int *state)
186{ 204{
187 int result = 0; 205 int result = ACPI_STATE_UNKNOWN;
188 acpi_status status = 0;
189 unsigned long long psc = 0;
190 206
191 if (!device || !state) 207 if (!device || !state)
192 return -EINVAL; 208 return -EINVAL;
193 209
194 *state = ACPI_STATE_UNKNOWN; 210 if (!device->flags.power_manageable) {
195
196 if (device->flags.power_manageable) {
197 /*
198 * Get the device's power state either directly (via _PSC) or
199 * indirectly (via power resources).
200 */
201 if (device->power.flags.power_resources) {
202 result = acpi_power_get_inferred_state(device, state);
203 if (result)
204 return result;
205 } else if (device->power.flags.explicit_get) {
206 status = acpi_evaluate_integer(device->handle, "_PSC",
207 NULL, &psc);
208 if (ACPI_FAILURE(status))
209 return -ENODEV;
210 *state = (int)psc;
211 }
212 } else {
213 /* TBD: Non-recursive algorithm for walking up hierarchy. */ 211 /* TBD: Non-recursive algorithm for walking up hierarchy. */
214 *state = device->parent ? 212 *state = device->parent ?
215 device->parent->power.state : ACPI_STATE_D0; 213 device->parent->power.state : ACPI_STATE_D0;
214 goto out;
215 }
216
217 /*
218 * Get the device's power state either directly (via _PSC) or
219 * indirectly (via power resources).
220 */
221 if (device->power.flags.explicit_get) {
222 unsigned long long psc;
223 acpi_status status = acpi_evaluate_integer(device->handle,
224 "_PSC", NULL, &psc);
225 if (ACPI_FAILURE(status))
226 return -ENODEV;
227
228 result = psc;
229 }
230 /* The test below covers ACPI_STATE_UNKNOWN too. */
231 if (result <= ACPI_STATE_D2) {
232 ; /* Do nothing. */
233 } else if (device->power.flags.power_resources) {
234 int error = acpi_power_get_inferred_state(device, &result);
235 if (error)
236 return error;
237 } else if (result == ACPI_STATE_D3_HOT) {
238 result = ACPI_STATE_D3;
216 } 239 }
240 *state = result;
217 241
218 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", 242 out:
219 device->pnp.bus_id, *state)); 243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
244 device->pnp.bus_id, state_string(*state)));
220 245
221 return 0; 246 return 0;
222} 247}
@@ -234,13 +259,14 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
234 /* Make sure this is a valid target state */ 259 /* Make sure this is a valid target state */
235 260
236 if (state == device->power.state) { 261 if (state == device->power.state) {
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", 262 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
238 state)); 263 state_string(state)));
239 return 0; 264 return 0;
240 } 265 }
241 266
242 if (!device->power.states[state].flags.valid) { 267 if (!device->power.states[state].flags.valid) {
243 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state); 268 printk(KERN_WARNING PREFIX "Device does not support %s\n",
269 state_string(state));
244 return -ENODEV; 270 return -ENODEV;
245 } 271 }
246 if (device->parent && (state < device->parent->power.state)) { 272 if (device->parent && (state < device->parent->power.state)) {
@@ -294,13 +320,13 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
294 end: 320 end:
295 if (result) 321 if (result)
296 printk(KERN_WARNING PREFIX 322 printk(KERN_WARNING PREFIX
297 "Device [%s] failed to transition to D%d\n", 323 "Device [%s] failed to transition to %s\n",
298 device->pnp.bus_id, state); 324 device->pnp.bus_id, state_string(state));
299 else { 325 else {
300 device->power.state = state; 326 device->power.state = state;
301 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 327 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
302 "Device [%s] transitioned to D%d\n", 328 "Device [%s] transitioned to %s\n",
303 device->pnp.bus_id, state)); 329 device->pnp.bus_id, state_string(state)));
304 } 330 }
305 331
306 return result; 332 return result;
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 0500f719f63e..dd6d6a3c6780 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -631,7 +631,7 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
631 * We know a device's inferred power state when all the resources 631 * We know a device's inferred power state when all the resources
632 * required for a given D-state are 'on'. 632 * required for a given D-state are 'on'.
633 */ 633 */
634 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) { 634 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
635 list = &device->power.states[i].resources; 635 list = &device->power.states[i].resources;
636 if (list->count < 1) 636 if (list->count < 1)
637 continue; 637 continue;
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 85cbfdccc97c..c8a1f3b68110 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1567,6 +1567,7 @@ static int acpi_bus_scan_fixed(void)
1567 ACPI_BUS_TYPE_POWER_BUTTON, 1567 ACPI_BUS_TYPE_POWER_BUTTON,
1568 ACPI_STA_DEFAULT, 1568 ACPI_STA_DEFAULT,
1569 &ops); 1569 &ops);
1570 device_init_wakeup(&device->dev, true);
1570 } 1571 }
1571 1572
1572 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { 1573 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 74ee4ab577b6..88561029cca8 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -57,6 +57,7 @@ MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
57MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".); 57MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
58 58
59static u8 sleep_states[ACPI_S_STATE_COUNT]; 59static u8 sleep_states[ACPI_S_STATE_COUNT];
60static bool pwr_btn_event_pending;
60 61
61static void acpi_sleep_tts_switch(u32 acpi_state) 62static void acpi_sleep_tts_switch(u32 acpi_state)
62{ 63{
@@ -184,6 +185,14 @@ static int acpi_pm_prepare(void)
184 return error; 185 return error;
185} 186}
186 187
188static int find_powerf_dev(struct device *dev, void *data)
189{
190 struct acpi_device *device = to_acpi_device(dev);
191 const char *hid = acpi_device_hid(device);
192
193 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
194}
195
187/** 196/**
188 * acpi_pm_finish - Instruct the platform to leave a sleep state. 197 * acpi_pm_finish - Instruct the platform to leave a sleep state.
189 * 198 *
@@ -192,6 +201,7 @@ static int acpi_pm_prepare(void)
192 */ 201 */
193static void acpi_pm_finish(void) 202static void acpi_pm_finish(void)
194{ 203{
204 struct device *pwr_btn_dev;
195 u32 acpi_state = acpi_target_sleep_state; 205 u32 acpi_state = acpi_target_sleep_state;
196 206
197 acpi_ec_unblock_transactions(); 207 acpi_ec_unblock_transactions();
@@ -209,6 +219,23 @@ static void acpi_pm_finish(void)
209 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 219 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
210 220
211 acpi_target_sleep_state = ACPI_STATE_S0; 221 acpi_target_sleep_state = ACPI_STATE_S0;
222
223 /* If we were woken with the fixed power button, provide a small
224 * hint to userspace in the form of a wakeup event on the fixed power
225 * button device (if it can be found).
226 *
227 * We delay the event generation til now, as the PM layer requires
228 * timekeeping to be running before we generate events. */
229 if (!pwr_btn_event_pending)
230 return;
231
232 pwr_btn_event_pending = false;
233 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
234 find_powerf_dev);
235 if (pwr_btn_dev) {
236 pm_wakeup_event(pwr_btn_dev, 0);
237 put_device(pwr_btn_dev);
238 }
212} 239}
213 240
214/** 241/**
@@ -298,9 +325,23 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
298 /* ACPI 3.0 specs (P62) says that it's the responsibility 325 /* ACPI 3.0 specs (P62) says that it's the responsibility
299 * of the OSPM to clear the status bit [ implying that the 326 * of the OSPM to clear the status bit [ implying that the
300 * POWER_BUTTON event should not reach userspace ] 327 * POWER_BUTTON event should not reach userspace ]
328 *
329 * However, we do generate a small hint for userspace in the form of
330 * a wakeup event. We flag this condition for now and generate the
331 * event later, as we're currently too early in resume to be able to
332 * generate wakeup events.
301 */ 333 */
302 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) 334 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
303 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 335 acpi_event_status pwr_btn_status;
336
337 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
338
339 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
340 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
341 /* Flag for later */
342 pwr_btn_event_pending = true;
343 }
344 }
304 345
305 /* 346 /*
306 * Disable and clear GPE status before interrupt is enabled. Some GPEs 347 * Disable and clear GPE status before interrupt is enabled. Some GPEs
@@ -730,8 +771,8 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
730 * can wake the system. _S0W may be valid, too. 771 * can wake the system. _S0W may be valid, too.
731 */ 772 */
732 if (acpi_target_sleep_state == ACPI_STATE_S0 || 773 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
733 (device_may_wakeup(dev) && 774 (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
734 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 775 adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
735 acpi_status status; 776 acpi_status status;
736 777
737 acpi_method[3] = 'W'; 778 acpi_method[3] = 'W';
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 7d5f56edb8ef..4267789ca995 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -910,14 +910,17 @@ static inline int cmos_poweroff(struct device *dev)
910 910
911static u32 rtc_handler(void *context) 911static u32 rtc_handler(void *context)
912{ 912{
913 struct device *dev = context;
914
915 pm_wakeup_event(dev, 0);
913 acpi_clear_event(ACPI_EVENT_RTC); 916 acpi_clear_event(ACPI_EVENT_RTC);
914 acpi_disable_event(ACPI_EVENT_RTC, 0); 917 acpi_disable_event(ACPI_EVENT_RTC, 0);
915 return ACPI_INTERRUPT_HANDLED; 918 return ACPI_INTERRUPT_HANDLED;
916} 919}
917 920
918static inline void rtc_wake_setup(void) 921static inline void rtc_wake_setup(struct device *dev)
919{ 922{
920 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL); 923 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
921 /* 924 /*
922 * After the RTC handler is installed, the Fixed_RTC event should 925 * After the RTC handler is installed, the Fixed_RTC event should
923 * be disabled. Only when the RTC alarm is set will it be enabled. 926 * be disabled. Only when the RTC alarm is set will it be enabled.
@@ -950,7 +953,7 @@ cmos_wake_setup(struct device *dev)
950 if (acpi_disabled) 953 if (acpi_disabled)
951 return; 954 return;
952 955
953 rtc_wake_setup(); 956 rtc_wake_setup(dev);
954 acpi_rtc_info.wake_on = rtc_wake_on; 957 acpi_rtc_info.wake_on = rtc_wake_on;
955 acpi_rtc_info.wake_off = rtc_wake_off; 958 acpi_rtc_info.wake_off = rtc_wake_off;
956 959