power: supply: act8945a_charger: Add max current property

Add the power supply's current max property,
POWER_SUPPLY_PROP_CURRENT_MAX.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 80 insertions, 9 deletions

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index 2f875997d97a..d1eb2e359532 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -13,7 +13,6 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
@@ -85,6 +84,7 @@ struct act8945a_charger {
 
         bool init_done;
         struct gpio_desc *lbo_gpio;
+        struct gpio_desc *chglev_gpio;
 };
 
 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -265,12 +265,80 @@ static int act8945a_get_capacity_level(struct act8945a_charger *charger,
         return 0;
 }
 
+#define MAX_CURRENT_USB_HIGH    450000
+#define MAX_CURRENT_USB_LOW     90000
+#define MAX_CURRENT_USB_PRE     45000
+/*
+ * Riset(K) = 2336 * (1V/Ichg(mA)) - 0.205
+ * Riset = 2.43K
+ */
+#define MAX_CURRENT_AC_HIGH             886527
+#define MAX_CURRENT_AC_LOW              117305
+#define MAX_CURRENT_AC_HIGH_PRE         88653
+#define MAX_CURRENT_AC_LOW_PRE          11731
+
+static int act8945a_get_current_max(struct act8945a_charger *charger,
+                                    struct regmap *regmap, int *val)
+{
+        int ret;
+        unsigned int status, state;
+        unsigned int acin_state;
+        int chgin_level = gpiod_get_value(charger->chglev_gpio);
+
+        ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+        if (ret < 0)
+                return ret;
+
+        ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+        if (ret < 0)
+                return ret;
+
+        acin_state = (state & APCH_STATE_ACINSTAT) >> 1;
+
+        state &= APCH_STATE_CSTATE;
+        state >>= APCH_STATE_CSTATE_SHIFT;
+
+        switch (state) {
+        case APCH_STATE_CSTATE_PRE:
+                if (acin_state) {
+                        if (chgin_level)
+                                *val = MAX_CURRENT_AC_HIGH_PRE;
+                        else
+                                *val = MAX_CURRENT_AC_LOW_PRE;
+                } else {
+                        *val = MAX_CURRENT_USB_PRE;
+                }
+                break;
+        case APCH_STATE_CSTATE_FAST:
+                if (acin_state) {
+                        if (chgin_level)
+                                *val = MAX_CURRENT_AC_HIGH;
+                        else
+                                *val = MAX_CURRENT_AC_LOW;
+                } else {
+                        if (chgin_level)
+                                *val = MAX_CURRENT_USB_HIGH;
+                        else
+                                *val = MAX_CURRENT_USB_LOW;
+                }
+                break;
+        case APCH_STATE_CSTATE_EOC:
+        case APCH_STATE_CSTATE_DISABLED:
+        default:
+                *val = 0;
+                break;
+        }
+
+        return 0;
+}
+
 static enum power_supply_property act8945a_charger_props[] = {
         POWER_SUPPLY_PROP_STATUS,
         POWER_SUPPLY_PROP_CHARGE_TYPE,
         POWER_SUPPLY_PROP_TECHNOLOGY,
         POWER_SUPPLY_PROP_HEALTH,
         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+        POWER_SUPPLY_PROP_CURRENT_MAX,
         POWER_SUPPLY_PROP_MODEL_NAME,
         POWER_SUPPLY_PROP_MANUFACTURER
 };
@@ -300,6 +368,10 @@ static int act8945a_charger_get_property(struct power_supply *psy,
                 ret = act8945a_get_capacity_level(charger,
                                                   regmap, &val->intval);
                 break;
+        case POWER_SUPPLY_PROP_CURRENT_MAX:
+                ret = act8945a_get_current_max(charger,
+                                               regmap, &val->intval);
+                break;
         case POWER_SUPPLY_PROP_MODEL_NAME:
                 val->strval = act8945a_charger_model;
                 break;
@@ -390,13 +462,11 @@ static int act8945a_charger_config(struct device *dev,
                                    struct act8945a_charger *charger)
 {
         struct device_node *np = dev->of_node;
-        enum of_gpio_flags flags;
         struct regmap *regmap = charger->regmap;
 
         u32 total_time_out;
         u32 pre_time_out;
         u32 input_voltage_threshold;
-        int chglev_pin;
         int err, ret;
 
         unsigned int tmp;
@@ -431,12 +501,13 @@ static int act8945a_charger_config(struct device *dev,
         if (ret)
                 dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
 
-        chglev_pin = of_get_named_gpio_flags(np,
-                                "active-semi,chglev-gpios", 0, &flags);
-
-        if (gpio_is_valid(chglev_pin)) {
-                gpio_set_value(chglev_pin,
-                               ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
+        charger->chglev_gpio = devm_gpiod_get_optional(dev,
+                                                       "active-semi,chglev",
+                                                       GPIOD_IN);
+        if (IS_ERR(charger->chglev_gpio)) {
+                err = PTR_ERR(charger->chglev_gpio);
+                dev_err(dev, "unable to claim gpio \"chglev\": %d\n", err);
+                return err;
         }
 
         if (of_property_read_u32(np,