power: smb349: Addition of interrupt support

-Addition of interrupt support to update charger
properties to fuel-gauge driver.

Change-Id: If6384921247b6534f2d8142ad5fd079c5f6e0890
Signed-off-by: Syed Rafiuddin <srafiuddin@nvidia.com>
Reviewed-on: http://git-master/r/83507
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

1 files changed, 172 insertions, 49 deletions

diff --git a/drivers/power/smb349-charger.c b/drivers/power/smb349-charger.c
index b3db989fa070..6a4c738b4647 100644
--- a/drivers/power/smb349-charger.c
+++ b/drivers/power/smb349-charger.c
@@ -32,6 +32,9 @@
 #include <linux/regulator/machine.h>
 #include <linux/smb349-charger.h>
 #include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
 
 #define SMB349_CHARGE		0x00
 #define SMB349_CHRG_CRNTS	0x01
@@ -68,11 +71,14 @@
 #define SMB349_STS_REG_D	0x3E
 #define SMB349_STS_REG_E	0x3F
 
+#define SMB349_ENABLE_WRITE	1
+#define SMB349_DISABLE_WRITE	0
 #define ENABLE_WRT_ACCESS	0x80
 #define THERM_CTRL		0x10
 #define BATTERY_MISSING		0x10
 #define CHARGING		0x06
 #define DEDICATED_CHARGER	0x04
+#define CHRG_DOWNSTRM_PORT	0x08
 #define ENABLE_CHARGE		0x02
 
 static struct smb349_charger *charger;
@@ -120,21 +126,145 @@ static int smb349_update_reg(struct i2c_client *client, int reg, u8 value)
 	return ret;
 }
 
-int smb349_volatile_writes(struct i2c_client *client)
+int smb349_volatile_writes(struct i2c_client *client, uint8_t value)
 {
 	int ret = 0;
 
-	/* Enable volatile write to config registers*/
-	ret = smb349_update_reg(client, SMB349_CMD_REG, ENABLE_WRT_ACCESS);
+	if (value == SMB349_ENABLE_WRITE) {
+		/* Enable volatile write to config registers */
+		ret = smb349_update_reg(client, SMB349_CMD_REG,
+						ENABLE_WRT_ACCESS);
+		if (ret < 0) {
+			dev_err(&client->dev, "%s(): Failed in writing"
+				"register 0x%02x\n", __func__, SMB349_CMD_REG);
+			return ret;
+		}
+	} else {
+		ret = smb349_read(client, SMB349_CMD_REG);
+		if (ret < 0) {
+			dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+			return ret;
+		}
+
+		ret = smb349_write(client, SMB349_CMD_REG, ret & (~(1<<7)));
+		if (ret < 0) {
+			dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+			return ret;
+		}
+	}
+	return ret;
+}
+
+static void smb349_clear_interrupts(struct i2c_client *client)
+{
+	uint8_t val, buf[6];
+
+	val = i2c_smbus_read_i2c_block_data(client, SMB349_INTR_STS_A, 6, buf);
+	if (val < 0)
+		dev_err(&client->dev, "%s(): Failed in clearing interrupts\n",
+								__func__);
+}
+
+static int smb349_configure_charger(struct i2c_client *client)
+{
+	int ret = 0;
+
+	/* Enable volatile writes to registers */
+	ret = smb349_volatile_writes(client, SMB349_ENABLE_WRITE);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s() error in configuring charger..\n",
+								__func__);
+		goto error;
+	}
+
+	 /* Enable charging */
+	ret = smb349_update_reg(client, SMB349_CMD_REG, ENABLE_CHARGE);
 	if (ret < 0) {
 		dev_err(&client->dev, "%s(): Failed in writing register"
 				"0x%02x\n", __func__, SMB349_CMD_REG);
-		return ret;
+		goto error;
 	}
 
+	/* Configure THERM ctrl */
+	ret = smb349_update_reg(client, SMB349_THERM_CTRL, THERM_CTRL);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+		goto error;
+	}
+
+	/* Disable volatile writes to registers */
+	ret = smb349_volatile_writes(client, SMB349_DISABLE_WRITE);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s() error in configuring charger..\n",
+								__func__);
+		goto error;
+	}
+error:
 	return ret;
 }
 
+static irqreturn_t smb349_status_isr(int irq, void *dev_id)
+{
+	struct i2c_client *client = charger->client;
+	int ret, val;
+
+	val =  smb349_read(client, SMB349_STS_REG_D);
+	if (val < 0) {
+		dev_err(&client->dev, "%s(): Failed in reading register"
+				"0x%02x\n", __func__, SMB349_STS_REG_D);
+		goto irq_error;
+	} else if (val != 0) {
+
+		if (val & DEDICATED_CHARGER)
+			charger->chrg_type = AC;
+		else if (val & CHRG_DOWNSTRM_PORT)
+			charger->chrg_type = USB;
+
+		/* configure charger */
+		ret = smb349_configure_charger(client);
+		if (ret < 0) {
+			dev_err(&client->dev, "%s() error in configuring"
+				"charger..\n", __func__);
+			goto irq_error;
+		}
+
+		charger->state = progress;
+	} else {
+		charger->state = stopped;
+
+		ret = smb349_read(client, SMB349_CMD_REG);
+		if (ret < 0) {
+			dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+			goto irq_error;
+		}
+
+		ret = smb349_write(client, SMB349_CMD_REG, (ret & (~(1<<1))));
+		if (ret < 0) {
+			dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+			goto irq_error;
+		}
+	}
+
+	if (charger->charger_cb)
+		charger->charger_cb(charger->state, charger->chrg_type,
+						charger->charger_cb_data);
+irq_error:
+	smb349_clear_interrupts(client);
+	return IRQ_HANDLED;
+}
+
+int register_callback(charging_callback_t cb, void *args)
+{
+	struct smb349_charger *charger_data = charger;
+	if (!charger_data)
+		return -ENODEV;
+
+	charger_data->charger_cb = cb;
+	charger_data->charger_cb_data = args;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(register_callback);
+
 int smb349_battery_online(void)
 {
 	int val;
@@ -151,50 +281,49 @@ int smb349_battery_online(void)
 	else
 		return 1;
 }
-EXPORT_SYMBOL_GPL(smb349_battery_online);
 
-int smb349_charging_status(void)
+static int smb349_configure_interrupts(struct i2c_client *client)
 {
-	int val;
-	struct i2c_client *client = charger->client;
+	int ret = 0;
 
-	val = smb349_read(charger->client, SMB349_STS_REG_C);
-	if (val < 0) {
-		dev_err(&client->dev, "%s(): Failed in reading register"
-				"0x%02x\n", __func__, SMB349_STS_REG_C);
-		return val;
+	/* Enable volatile writes to registers */
+	ret = smb349_volatile_writes(client, SMB349_ENABLE_WRITE);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s() error in configuring charger..\n",
+								__func__);
+		goto error;
 	}
-	if (val & CHARGING)
-		return 1;
-	else
-		return 0;
-}
-EXPORT_SYMBOL_GPL(smb349_charging_status);
 
-int smb349_charger_type(void)
-{
-	int val;
-	struct i2c_client *client = charger->client;
+	ret = smb349_update_reg(client, SMB349_FAULT_INTR, 0xff);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s(): Failed in writing register"
+				"0x%02x\n", __func__, SMB349_CMD_REG);
+		goto error;
+	}
 
-	val = smb349_read(charger->client, SMB349_STS_REG_D);
-	if (val < 0) {
-		dev_err(&client->dev, "%s(): Failed in reading register"
-				"0x%02x\n", __func__, SMB349_STS_REG_D);
-		return val;
+	ret = smb349_update_reg(client, SMB349_STS_INTR_1, 0xff);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+		goto error;
+	}
+
+	 /* Disable volatile writes to registers */
+	ret = smb349_volatile_writes(client, SMB349_DISABLE_WRITE);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s() error in configuring charger..\n",
+								__func__);
+		goto error;
 	}
-	if (val & DEDICATED_CHARGER)
-		return 1;
-	else
-		return 0;
 
+error:
+	return ret;
 }
-EXPORT_SYMBOL_GPL(smb349_charger_type);
 
 static int __devinit smb349_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
-	int ret;
+	int ret, irq_num;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
 		return -EIO;
@@ -207,33 +336,27 @@ static int __devinit smb349_probe(struct i2c_client *client,
 	charger->dev = &client->dev;
 	i2c_set_clientdata(client, charger);
 
-	/* Check battery presence*/
+	/* Check battery presence */
 	if (!smb349_battery_online()) {
 		dev_err(&client->dev, "%s() No Battery present, exiting..\n",
 					__func__);
 		goto error;
 	}
 
-	/*Enable volatile writes to registers*/
-	ret = smb349_volatile_writes(client);
+	ret = smb349_configure_interrupts(client);
 	if (ret < 0) {
 		dev_err(&client->dev, "%s() error in configuring charger..\n",
 								__func__);
 		goto error;
 	}
 
-	/* Configure THERM ctrl*/
-	smb349_update_reg(client, SMB349_THERM_CTRL, THERM_CTRL);
-	if (ret < 0) {
-		dev_err(&client->dev, "%s: err %d\n", __func__, ret);
-		goto error;
-	}
-
-	/* Enable charging*/
-	ret = smb349_update_reg(client, SMB349_CMD_REG, ENABLE_CHARGE);
-	if (ret < 0) {
-		dev_err(&client->dev, "%s(): Failed in writing register"
-				"0x%02x\n", __func__, SMB349_CMD_REG);
+	irq_num = gpio_to_irq(client->irq);
+	ret = request_threaded_irq(irq_num,
+			NULL, smb349_status_isr, IRQ_TYPE_EDGE_FALLING,
+				"smb349", charger);
+	if (ret) {
+		dev_err(&client->dev, "%s(): Failed in requesting isr\n",
+				__func__);
 		goto error;
 	}