x86, olpc-xo1-sci: Propagate power supply/battery events

EC events indicate change in AC power connectivity, battery state of
charge, battery error, battery presence, etc. Send notifications to
the power supply subsystem when changes are detected.

Signed-off-by: Daniel Drake <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Acked-by: Andres Salomon <[e-mail]>
Signed-off-by: H. Peter Anvin <[e-mail]>

arch/x86/Kconfig

···
 
 config OLPC_XO1_SCI
 	bool "OLPC XO-1 SCI extras"
-	depends on OLPC && OLPC_XO1_PM
+	depends on OLPC && OLPC_XO1_PM && POWER_SUPPLY
 	select GPIO_CS5535
 	select MFD_CORE
 	---help---
···
 	   - Power button
 	   - Ebook switch
 	   - Lid switch
+	   - AC adapter status updates
+	   - Battery status updates
 
 endif # X86_32
 

arch/x86/platform/olpc/olpc-xo1-sci.c

···
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/mfd/core.h>
+#include <linux/power_supply.h>
 #include <linux/suspend.h>
 #include <linux/workqueue.h>
 
···
 	[LID_WAKE_OPEN] = "open",
 	[LID_WAKE_CLOSE] = "close",
 };
+
+static void battery_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-battery");
+
+	if (psy) {
+		power_supply_changed(psy);
+		put_device(psy->dev);
+	}
+}
+
+static void ac_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-ac");
+
+	if (psy) {
+		power_supply_changed(psy);
+		put_device(psy->dev);
+	}
+}
 
 /* Report current ebook switch state through input layer */
 static void send_ebook_state(void)
···
 
 		pr_debug(PFX "SCI 0x%x received\n", data);
 
+		switch (data) {
+		case EC_SCI_SRC_BATERR:
+		case EC_SCI_SRC_BATSOC:
+		case EC_SCI_SRC_BATTERY:
+		case EC_SCI_SRC_BATCRIT:
+			battery_status_changed();
+			break;
+		case EC_SCI_SRC_ACPWR:
+			ac_status_changed();
+			break;
+		}
+
 		if (data == EC_SCI_SRC_EBOOK && propagate_events)
 			send_ebook_state();
 	} while (data);
···
 
 	/* Enable all EC events */
 	olpc_ec_mask_write(EC_SCI_SRC_ALL);
+
+	/* Power/battery status might have changed too */
+	battery_status_changed();
+	ac_status_changed();
 	return 0;
 }