power: smb349: smb349 charger driver

Smb349 battery charger driver for kai platform.

Signed-off-by: Syed Rafiuddin <srafiuddin@nvidia.com>
Reviewed-on: http://git-master/r/78211
(cherry picked from commit f059c9db2735a6e0088dd9cd61a623b13b5d717e)

Change-Id: Ifa401713928d29bb4235353e50b66e632c7625ba
Signed-off-by: Pritesh Raithatha <praithatha@nvidia.com>
Reviewed-on: http://git-master/r/79980
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>

1 files changed, 283 insertions, 0 deletions

diff --git a/drivers/power/smb349-charger.c b/drivers/power/smb349-charger.c
new file mode 100644
index 000000000000..b3db989fa070
--- /dev/null
+++ b/drivers/power/smb349-charger.c
@@ -0,0 +1,283 @@
+/*
+ * drivers/power/smb349-charger.c
+ *
+ * Battery charger driver for smb349 from summit microelectronics
+ *
+ * Copyright (c) 2012, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/power_supply.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/smb349-charger.h>
+#include <linux/slab.h>
+
+#define SMB349_CHARGE		0x00
+#define SMB349_CHRG_CRNTS	0x01
+#define SMB349_VRS_FUNC		0x02
+#define SMB349_FLOAT_VLTG	0x03
+#define SMB349_CHRG_CTRL	0x04
+#define SMB349_STAT_TIME_CTRL	0x05
+#define SMB349_PIN_CTRL		0x06
+#define SMB349_THERM_CTRL	0x07
+#define SMB349_CTRL_REG		0x09
+
+#define SMB349_OTG_TLIM_REG	0x0A
+#define SMB349_HRD_SFT_TEMP	0x0B
+#define SMB349_FAULT_INTR	0x0C
+#define SMB349_STS_INTR_1	0x0D
+#define SMB349_SYSOK_USB3	0x0E
+#define SMB349_IN_CLTG_DET	0x10
+#define SMB349_STS_INTR_2	0x11
+
+#define SMB349_CMD_REG		0x30
+#define SMB349_CMD_REG_B	0x31
+#define SMB349_CMD_REG_c	0x33
+
+#define SMB349_INTR_STS_A	0x35
+#define SMB349_INTR_STS_B	0x36
+#define SMB349_INTR_STS_C	0x37
+#define SMB349_INTR_STS_D	0x38
+#define SMB349_INTR_STS_E	0x39
+#define SMB349_INTR_STS_F	0x3A
+
+#define SMB349_STS_REG_A	0x3B
+#define SMB349_STS_REG_B	0x3C
+#define SMB349_STS_REG_C	0x3D
+#define SMB349_STS_REG_D	0x3E
+#define SMB349_STS_REG_E	0x3F
+
+#define ENABLE_WRT_ACCESS	0x80
+#define THERM_CTRL		0x10
+#define BATTERY_MISSING		0x10
+#define CHARGING		0x06
+#define DEDICATED_CHARGER	0x04
+#define ENABLE_CHARGE		0x02
+
+static struct smb349_charger *charger;
+
+static int smb349_read(struct i2c_client *client, int reg)
+{
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(client, reg);
+
+	if (ret < 0)
+		dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+	return ret;
+}
+
+static int smb349_write(struct i2c_client *client, int reg, u8 value)
+{
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client, reg, value);
+
+	if (ret < 0)
+		dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+	return ret;
+}
+
+static int smb349_update_reg(struct i2c_client *client, int reg, u8 value)
+{
+	int ret, retval;
+
+	retval = smb349_read(client, reg);
+	if (retval < 0) {
+		dev_err(&client->dev, "%s: err %d\n", __func__, retval);
+		return retval;
+	}
+
+	ret = smb349_write(client, reg, retval | value);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+int smb349_volatile_writes(struct i2c_client *client)
+{
+	int ret = 0;
+
+	/* 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;
+	}
+
+	return ret;
+}
+
+int smb349_battery_online(void)
+{
+	int val;
+	struct i2c_client *client = charger->client;
+
+	val = smb349_read(charger->client, SMB349_INTR_STS_B);
+	if (val < 0) {
+		dev_err(&client->dev, "%s(): Failed in reading register"
+				"0x%02x\n", __func__, SMB349_INTR_STS_B);
+		return val;
+	}
+	if (val & BATTERY_MISSING)
+		return 0;
+	else
+		return 1;
+}
+EXPORT_SYMBOL_GPL(smb349_battery_online);
+
+int smb349_charging_status(void)
+{
+	int val;
+	struct i2c_client *client = charger->client;
+
+	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;
+	}
+	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;
+
+	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;
+	}
+	if (val & DEDICATED_CHARGER)
+		return 1;
+	else
+		return 0;
+
+}
+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;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+		return -EIO;
+
+	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	charger->client = client;
+	charger->dev = &client->dev;
+	i2c_set_clientdata(client, charger);
+
+	/* 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);
+	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);
+		goto error;
+	}
+
+	return 0;
+error:
+	kfree(charger);
+	return ret;
+}
+
+static int __devexit smb349_remove(struct i2c_client *client)
+{
+	struct smb349_charger *charger = i2c_get_clientdata(client);
+
+	kfree(charger);
+	return 0;
+}
+
+static const struct i2c_device_id smb349_id[] = {
+	{ "smb349", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, smb349_id);
+
+static struct i2c_driver smb349_i2c_driver = {
+	.driver	= {
+		.name	= "smb349",
+	},
+	.probe		= smb349_probe,
+	.remove		= __devexit_p(smb349_remove),
+	.id_table	= smb349_id,
+};
+
+static int __init smb349_init(void)
+{
+	return i2c_add_driver(&smb349_i2c_driver);
+}
+module_init(smb349_init);
+
+static void __exit smb349_exit(void)
+{
+	i2c_del_driver(&smb349_i2c_driver);
+}
+module_exit(smb349_exit);
+
+MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
+MODULE_DESCRIPTION("SMB349 Battery-Charger");
+MODULE_LICENSE("GPL");