power_supply: Add support for WM8350 PMU

This patch adds support for the PMU provided by the WM8350 which
implements battery, line and USB supplies including a battery charger.
The hardware functions largely autonomously, with minimal software
control required to initiate fast charging.

Support for configuration of the USB supply is not yet implemented.
This means that the hardware will remain in the mode configured at
startup, by default limiting the current drawn from USB to 100mA.

This driver was originally written by Liam Girdwood with subsequent
updates for submission by Mark Brown.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

2 files changed, 48 insertions, 1 deletions

diff --git a/include/linux/mfd/wm8350/core.h b/include/linux/mfd/wm8350/core.h
index cc190055b9c4..d2614dfc9397 100644
--- a/include/linux/mfd/wm8350/core.h
+++ b/include/linux/mfd/wm8350/core.h
@@ -57,6 +57,9 @@
 #define WM8350_OVER_CURRENT_INT_STATUS_MASK     0x25
 #define WM8350_GPIO_INT_STATUS_MASK             0x26
 #define WM8350_COMPARATOR_INT_STATUS_MASK       0x27
+#define WM8350_MISC_OVERRIDES                   0xE3
+#define WM8350_COMPARATOR_OVERRIDES             0xE7
+#define WM8350_STATE_MACHINE_STATUS             0xE9
 
 #define WM8350_MAX_REGISTER                     0xFF
 
@@ -523,6 +526,29 @@
 #define WM8350_DC2_STS                          0x0002
 #define WM8350_DC1_STS                          0x0001
 
+/*
+ * R227 (0xE3) - Misc Overrides
+ */
+#define WM8350_USB_LIMIT_OVRDE                  0x0400
+
+/*
+ * R227 (0xE7) - Comparator Overrides
+ */
+#define WM8350_USB_FB_OVRDE                     0x8000
+#define WM8350_WALL_FB_OVRDE                    0x4000
+#define WM8350_BATT_FB_OVRDE                    0x2000
+
+
+/*
+ * R233 (0xE9) - State Machinine Status
+ */
+#define WM8350_USB_SM_MASK                      0x0700
+#define WM8350_USB_SM_SHIFT                     8
+
+#define WM8350_USB_SM_100_SLV   1
+#define WM8350_USB_SM_500_SLV   5
+#define WM8350_USB_SM_STDBY_SLV 7
+
 /* WM8350 wake up conditions */
 #define WM8350_IRQ_WKUP_OFF_STATE               43
 #define WM8350_IRQ_WKUP_HIB_STATE               44
diff --git a/include/linux/mfd/wm8350/supply.h b/include/linux/mfd/wm8350/supply.h
index 1c8f3cde79b0..79721513fa9f 100644
--- a/include/linux/mfd/wm8350/supply.h
+++ b/include/linux/mfd/wm8350/supply.h
@@ -13,7 +13,8 @@
 #ifndef __LINUX_MFD_WM8350_SUPPLY_H_
 #define __LINUX_MFD_WM8350_SUPPLY_H_
 
-#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/power_supply.h>
 
 /*
  * Charger registers
@@ -104,8 +105,28 @@
 #define WM8350_IRQ_EXT_WALL_FB                  37
 #define WM8350_IRQ_EXT_BAT_FB                   38
 
+/*
+ * Policy to control charger state machine.
+ */
+struct wm8350_charger_policy {
+
+        /* charger state machine policy  - set in machine driver */
+        int eoc_mA;             /* end of charge current (mA)  */
+        int charge_mV;          /* charge voltage */
+        int fast_limit_mA;      /* fast charge current limit */
+        int fast_limit_USB_mA;  /* USB fast charge current limit */
+        int charge_timeout;     /* charge timeout (mins) */
+        int trickle_start_mV;   /* trickle charge starts at mV */
+        int trickle_charge_mA;  /* trickle charge current */
+        int trickle_charge_USB_mA;      /* USB trickle charge current */
+};
+
 struct wm8350_power {
         struct platform_device *pdev;
+        struct power_supply battery;
+        struct power_supply usb;
+        struct power_supply ac;
+        struct wm8350_charger_policy *policy;
 };
 
 #endif