power: bq27x00_battery: Updating driver from https://github.com/aneeshv/linux-bq27xxx/

Change-Id: I1d856187db5a95cde7e6ab817c5d95e53097e4c8

1 files changed, 1066 insertions, 162 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 26037ca7efb..98fa8abcae7 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -22,7 +22,10 @@
  * Datasheets:
  * http://focus.ti.com/docs/prod/folders/print/bq27000.html
  * http://focus.ti.com/docs/prod/folders/print/bq27500.html
+ * http://www.ti.com/product/bq27411-g1
+ * http://www.ti.com/product/bq27421-g1
  * http://www.ti.com/product/bq27425-g1
+ * http://www.ti.com/product/bq27441-g1
  */
 
 #include <linux/module.h>
@@ -41,48 +44,215 @@
 
 #define DRIVER_VERSION			"1.2.0"
 
-#define BQ27x00_REG_TEMP		0x06
-#define BQ27x00_REG_VOLT		0x08
-#define BQ27x00_REG_AI			0x14
-#define BQ27x00_REG_FLAGS		0x0A
-#define BQ27x00_REG_TTE			0x16
-#define BQ27x00_REG_TTF			0x18
-#define BQ27x00_REG_TTECP		0x26
-#define BQ27x00_REG_NAC			0x0C /* Nominal available capacity */
-#define BQ27x00_REG_LMD			0x12 /* Last measured discharge */
-#define BQ27x00_REG_CYCT		0x2A /* Cycle count total */
-#define BQ27x00_REG_AE			0x22 /* Available energy */
-#define BQ27x00_POWER_AVG		0x24
+#define INVALID_REG_ADDR		0xFF
 
-#define BQ27000_REG_RSOC		0x0B /* Relative State-of-Charge */
-#define BQ27000_REG_ILMD		0x76 /* Initial last measured discharge */
-#define BQ27000_FLAG_EDVF		BIT(0) /* Final End-of-Discharge-Voltage flag */
-#define BQ27000_FLAG_EDV1		BIT(1) /* First End-of-Discharge-Voltage flag */
-#define BQ27000_FLAG_CI			BIT(4) /* Capacity Inaccurate flag */
-#define BQ27000_FLAG_FC			BIT(5)
-#define BQ27000_FLAG_CHGS		BIT(7) /* Charge state flag */
+enum bq27xxx_reg_index {
+	BQ27XXX_REG_CTRL = 0,
+	BQ27XXX_REG_TEMP,
+	BQ27XXX_REG_INT_TEMP,
+	BQ27XXX_REG_VOLT,
+	BQ27XXX_REG_AI,
+	BQ27XXX_REG_FLAGS,
+	BQ27XXX_REG_TTE,
+	BQ27XXX_REG_TTF,
+	BQ27XXX_REG_TTES,
+	BQ27XXX_REG_TTECP,
+	BQ27XXX_REG_NAC,
+	BQ27XXX_REG_FCC,
+	BQ27XXX_REG_CYCT,
+	BQ27XXX_REG_AE,
+	BQ27XXX_REG_SOC,
+	BQ27XXX_REG_DCAP,
+	BQ27XXX_POWER_AVG,
+	NUM_REGS
+};
+
+/* bq27500 registers */
+static __initdata u8 bq27500_regs[NUM_REGS] = {
+	0x00,	/* CONTROL	*/
+	0x06,	/* TEMP		*/
+	0xFF,	/* INT TEMP -NA	*/
+	0x08,	/* VOLT		*/
+	0x14,	/* AVG CURR	*/
+	0x0A,	/* FLAGS	*/
+	0x16,	/* TTE		*/
+	0x18,	/* TTF		*/
+	0x1c,	/* TTES		*/
+	0x26,	/* TTECP	*/
+	0x0C,	/* NAC		*/
+	0x12,	/* LMD(FCC)	*/
+	0x2A,	/* CYCT		*/
+	0x22,	/* AE		*/
+	0x2C,	/* SOC(RSOC)	*/
+	0x3C,	/* DCAP(ILMD)	*/
+	0x24,	/* AP		*/
+};
+
+/* bq27520 registers */
+static __initdata u8 bq27520_regs[] = {
+	0x00,	/* CONTROL	*/
+	0x06,	/* TEMP		*/
+	0xFF,	/* INT TEMP - NA*/
+	0x08,	/* VOLT		*/
+	0x14,	/* AVG CURR	*/
+	0x0A,	/* FLAGS	*/
+	0x16,	/* TTE		*/
+	0x18,	/* TTF		*/
+	0x1c,	/* TTES		*/
+	0x26,	/* TTECP	*/
+	0x0C,	/* NAC		*/
+	0x12,	/* LMD		*/
+	0xFF,	/* CYCT - NA	*/
+	0x22,	/* AE		*/
+	0x2C,	/* SOC(RSOC	*/
+	0xFF,	/* DCAP(ILMD) - NA */
+	0x24,	/* AP		*/
+};
+
+/* bq2753x registers */
+static __initdata u8 bq2753x_regs[] = {
+	0x00,	/* CONTROL	*/
+	0x06,	/* TEMP		*/
+	0xFF,	/* INT TEMP - NA*/
+	0x08,	/* VOLT		*/
+	0x14,	/* AVG CURR	*/
+	0x0A,	/* FLAGS	*/
+	0x16,	/* TTE		*/
+	0xFF,	/* TTF - NA	*/
+	0xFF,	/* TTES - NA	*/
+	0xFF,	/* TTECP - NA	*/
+	0x0C,	/* NAC		*/
+	0x12,	/* LMD(FCC)	*/
+	0x2A,	/* CYCT		*/
+	0xFF,	/* AE - NA	*/
+	0x2C,	/* SOC(RSOC)	*/
+	0xFF,	/* DCAP(ILMD) - NA */
+	0x24,	/* AP		*/
+};
+
+/* bq27200 registers */
+static __initdata u8 bq27200_regs[NUM_REGS] = {
+	0x00,	/* CONTROL	*/
+	0x06,	/* TEMP		*/
+	0xFF,	/* INT TEMP - NA	*/
+	0x08,	/* VOLT		*/
+	0x14,	/* AVG CURR	*/
+	0x0A,	/* FLAGS	*/
+	0x16,	/* TTE		*/
+	0x18,	/* TTF		*/
+	0x1c,	/* TTES		*/
+	0x26,	/* TTECP	*/
+	0x0C,	/* NAC		*/
+	0x12,	/* LMD(FCC)	*/
+	0x2A,	/* CYCT		*/
+	0x22,	/* AE		*/
+	0x0B,	/* SOC(RSOC)	*/
+	0x76,	/* DCAP(ILMD)	*/
+	0x24,	/* AP		*/
+};
+
+/* bq274xx registers */
+static __initdata u8 bq274xx_regs[NUM_REGS] = {
+	0x00,	/* CONTROL	*/
+	0x02,	/* TEMP		*/
+	0x1e,	/* INT TEMP	*/
+	0x04,	/* VOLT		*/
+	0x10,	/* AVG CURR	*/
+	0x06,	/* FLAGS	*/
+	0xFF,	/* TTE - NA	*/
+	0xFF,	/* TTF - NA	*/
+	0xFF,	/* TTES - NA	*/
+	0xFF,	/* TTECP - NA	*/
+	0x08,	/* NAC		*/
+	0x0E,	/* FCC		*/
+	0xFF,	/* CYCT - NA	*/
+	0xFF,	/* AE - NA	*/
+	0x1C,	/* SOC		*/
+	0x3C,	/* DCAP - NA	*/
+	0x18,	/* AP		*/
+};
+
+/* bq276xx registers - same as bq274xx except CYCT */
+static __initdata u8 bq276xx_regs[NUM_REGS] = {
+	0x00,	/* CONTROL	*/
+	0x02,	/* TEMP		*/
+	0x1e,	/* INT TEMP	*/
+	0x04,	/* VOLT		*/
+	0x10,	/* AVG CURR	*/
+	0x06,	/* FLAGS	*/
+	0xFF,	/* TTE - NA	*/
+	0xFF,	/* TTF - NA	*/
+	0xFF,	/* TTES - NA	*/
+	0xFF,	/* TTECP - NA	*/
+	0x08,	/* NAC		*/
+	0x0E,	/* FCC		*/
+	0x22,	/* CYCT		*/
+	0xFF,	/* AE - NA	*/
+	0x1C,	/* SOC		*/
+	0x3C,	/* DCAP - NA	*/
+	0x18,	/* AP		*/
+};
+
+/*
+ * SBS Commands for DF access - these are pretty standard
+ * So, no need to go in the command array
+ */
+#define BLOCK_DATA_CLASS		0x3E
+#define DATA_BLOCK			0x3F
+#define BLOCK_DATA			0x40
+#define BLOCK_DATA_CHECKSUM		0x60
+#define BLOCK_DATA_CONTROL		0x61
+
+/* bq274xx/bq276xx specific command information */
+#define BQ274XX_UNSEAL_KEY		0x80008000
+#define BQ274XX_SOFT_RESET		0x43
+
+#define BQ274XX_FLAG_ITPOR				0x20
+#define BQ274XX_CTRL_STATUS_INITCOMP	0x80
 
-#define BQ27500_REG_SOC			0x2C
-#define BQ27500_REG_DCAP		0x3C /* Design capacity */
-#define BQ27500_FLAG_DSC		BIT(0)
-#define BQ27500_FLAG_SOCF		BIT(1) /* State-of-Charge threshold final */
-#define BQ27500_FLAG_SOC1		BIT(2) /* State-of-Charge threshold 1 */
-#define BQ27500_FLAG_FC			BIT(9)
-#define BQ27500_FLAG_OTC		BIT(15)
+#define BQ27XXX_FLAG_DSC		BIT(0)
+#define BQ27XXX_FLAG_SOCF		BIT(1) /* State-of-Charge threshold final */
+#define BQ27XXX_FLAG_SOC1		BIT(2) /* State-of-Charge threshold 1 */
+#define BQ27XXX_FLAG_FC			BIT(9)
+#define BQ27XXX_FLAG_OTD		BIT(14)
+#define BQ27XXX_FLAG_OTC		BIT(15)
 
-/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
-#define BQ27425_REG_OFFSET		0x04
-#define BQ27425_REG_SOC			0x18 /* Register address plus offset */
+/* BQ27000 has different layout for Flags register */
+#define BQ27200_FLAG_EDVF		BIT(0) /* Final End-of-Discharge-Voltage flag */
+#define BQ27200_FLAG_EDV1		BIT(1) /* First End-of-Discharge-Voltage flag */
+#define BQ27200_FLAG_CI			BIT(4) /* Capacity Inaccurate flag */
+#define BQ27200_FLAG_FC			BIT(5)
+#define BQ27200_FLAG_CHGS		BIT(7) /* Charge state flag */
 
-#define BQ27000_RS			20 /* Resistor sense */
-#define BQ27x00_POWER_CONSTANT		(256 * 29200 / 1000)
+#define BQ27200_RS			20 /* Resistor sense */
+#define BQ27200_POWER_CONSTANT		(256 * 29200 / 1000)
+
+/* Subcommands of Control() */
+#define CONTROL_STATUS_SUBCMD		0x0000
+#define DEV_TYPE_SUBCMD			0x0001
+#define FW_VER_SUBCMD			0x0002
+#define DF_VER_SUBCMD			0x001F
+#define RESET_SUBCMD			0x0041
+#define SET_CFGUPDATE_SUBCMD		0x0013
+#define SEAL_SUBCMD			0x0020
+
+/* Location of SEAL enable bit in bq276xx DM */
+#define BQ276XX_OP_CFG_B_SUBCLASS	64
+#define BQ276XX_OP_CFG_B_OFFSET		2
+#define BQ276XX_OP_CFG_B_DEF_SEAL_BIT	(1 << 5)
 
 struct bq27x00_device_info;
 struct bq27x00_access_methods {
 	int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
+	int (*write)(struct bq27x00_device_info *di, u8 reg, int value,
+			bool single);
+	int (*blk_read)(struct bq27x00_device_info *di, u8 reg, u8 *data,
+		u8 sz);
+	int (*blk_write)(struct bq27x00_device_info *di, u8 reg, u8 *data,
+		u8 sz);
 };
 
-enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
+enum bq27x00_chip { BQ27200, BQ27500, BQ27520, BQ274XX, BQ276XX, BQ2753X};
 
 struct bq27x00_reg_cache {
 	int temperature;
@@ -98,6 +268,13 @@ struct bq27x00_reg_cache {
 	int health;
 };
 
+struct dm_reg {
+	u8 subclass;
+	u8 offset;
+	u8 len;
+	u32 data;
+};
+
 struct bq27x00_device_info {
 	struct device 		*dev;
 	int			id;
@@ -114,9 +291,15 @@ struct bq27x00_device_info {
 	struct bq27x00_access_methods bus;
 
 	struct mutex lock;
+
+	int fw_ver;
+	int df_ver;
+	u8 regs[NUM_REGS];
+	struct dm_reg *dm_regs;
+	u16 dm_regs_count;
 };
 
-static enum power_supply_property bq27x00_battery_props[] = {
+static __initdata enum power_supply_property bq27x00_battery_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
@@ -137,7 +320,57 @@ static enum power_supply_property bq27x00_battery_props[] = {
 	POWER_SUPPLY_PROP_HEALTH,
 };
 
-static enum power_supply_property bq27425_battery_props[] = {
+static __initdata enum power_supply_property bq27520_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_ENERGY_NOW,
+	POWER_SUPPLY_PROP_POWER_AVG,
+	POWER_SUPPLY_PROP_HEALTH,
+};
+
+static __initdata enum power_supply_property bq2753x_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_POWER_AVG,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_CYCLE_COUNT,
+};
+
+static __initdata enum power_supply_property bq274xx_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+};
+
+static __initdata enum power_supply_property bq276xx_battery_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
@@ -149,6 +382,31 @@ static enum power_supply_property bq27425_battery_props[] = {
 	POWER_SUPPLY_PROP_CHARGE_FULL,
 	POWER_SUPPLY_PROP_CHARGE_NOW,
 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CYCLE_COUNT,
+};
+
+/*
+ * Ordering the parameters based on subclass and then offset will help in
+ * having fewer flash writes while updating.
+ * Customize these values and, if necessary, add more based on system needs.
+ */
+static struct dm_reg bq274xx_dm_regs[] = {
+	{82, 0, 2, 1000},	/* Qmax */
+	{82, 5, 1, 0x81},	/* Load Select */
+	{82, 10, 2, 1340},	/* Design Capacity */
+	{82, 12, 2, 3700},	/* Design Energy */
+	{82, 16, 2, 3250},	/* Terminate Voltage */
+	{82, 27, 2, 110},	/* Taper rate */
+};
+
+static struct dm_reg bq276xx_dm_regs[] = {
+	{64, 2, 1, 0x2C},	/* Op Config B */
+	{82, 0, 2, 1000},	/* Qmax */
+	{82, 2, 1, 0x81},	/* Load Select */
+	{82, 3, 2, 1340},	/* Design Capacity */
+	{82, 5, 2, 3700},	/* Design Energy */
+	{82, 9, 2, 3250},	/* Terminate Voltage */
+	{82, 20, 2, 110},	/* Taper rate */
 };
 
 static unsigned int poll_interval = 360;
@@ -157,48 +415,319 @@ MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 				"0 disables polling");
 
 /*
+ * Forward Declarations
+ */
+static int read_dm_block(struct bq27x00_device_info *di, u8 subclass,
+	u8 offset, u8 *data);
+
+
+/*
  * Common code for BQ27x00 devices
  */
 
-static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
+static inline int bq27xxx_read(struct bq27x00_device_info *di, int reg_index,
 		bool single)
 {
-	if (di->chip == BQ27425)
-		return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
-	return di->bus.read(di, reg, single);
+	int val;
+
+	/* Reports 0 for invalid/missing registers */
+	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
+		return 0;
+
+	val = di->bus.read(di, di->regs[reg_index], single);
+
+	return val;
 }
 
+static inline int bq27xxx_write(struct bq27x00_device_info *di, int reg_index,
+		int value, bool single)
+{
+	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
+		return -1;
+
+	return di->bus.write(di, di->regs[reg_index], value, single);
+}
+
+static int control_cmd_wr(struct bq27x00_device_info *di, u16 cmd)
+{
+	dev_dbg(di->dev, "%s: cmd - %04x\n", __func__, cmd);
+
+	return di->bus.write(di, BQ27XXX_REG_CTRL, cmd, false);
+}
+
+static int control_cmd_read(struct bq27x00_device_info *di, u16 cmd)
+{
+	dev_dbg(di->dev, "%s: cmd - %04x\n", __func__, cmd);
+
+	di->bus.write(di, BQ27XXX_REG_CTRL, cmd, false);
+
+	msleep(5);
+
+	return di->bus.read(di, BQ27XXX_REG_CTRL, false);
+}
 /*
- * Higher versions of the chip like BQ27425 and BQ27500
- * differ from BQ27000 and BQ27200 in calculation of certain
- * parameters. Hence we need to check for the chip type.
+ * It is assumed that the gauge is in unsealed mode when this function
+ * is called
  */
-static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
+static int bq276xx_seal_enabled(struct bq27x00_device_info *di)
 {
-	if (di->chip == BQ27425 || di->chip == BQ27500)
-		return true;
-	return false;
+	u8 buf[32];
+	u8 op_cfg_b;
+
+	if (!read_dm_block(di, BQ276XX_OP_CFG_B_SUBCLASS,
+		BQ276XX_OP_CFG_B_OFFSET, buf)) {
+		return 1; /* Err on the side of caution and try to seal */
+	}
+
+	op_cfg_b = buf[BQ276XX_OP_CFG_B_OFFSET & 0x1F];
+
+	if (op_cfg_b & BQ276XX_OP_CFG_B_DEF_SEAL_BIT)
+		return 1;
+
+	return 0;
+}
+
+#define SEAL_UNSEAL_POLLING_RETRY_LIMIT	1000
+
+static inline int sealed(struct bq27x00_device_info *di)
+{
+	return control_cmd_read(di, CONTROL_STATUS_SUBCMD) & (1 << 13);
+}
+
+static int unseal(struct bq27x00_device_info *di, u32 key)
+{
+	int i = 0;
+
+	dev_dbg(di->dev, "%s: key - %08x\n", __func__, key);
+
+	if (!sealed(di))
+		goto out;
+
+	di->bus.write(di, BQ27XXX_REG_CTRL, key & 0xFFFF, false);
+	msleep(5);
+	di->bus.write(di, BQ27XXX_REG_CTRL, (key & 0xFFFF0000) >> 16, false);
+	msleep(5);
+
+	while (i < SEAL_UNSEAL_POLLING_RETRY_LIMIT) {
+		i++;
+		if (!sealed(di))
+			break;
+		msleep(10);
+	}
+
+out:
+	if (i == SEAL_UNSEAL_POLLING_RETRY_LIMIT) {
+		dev_err(di->dev, "%s: failed\n", __func__);
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+static int seal(struct bq27x00_device_info *di)
+{
+	int i = 0;
+	int is_sealed;
+
+	dev_dbg(di->dev, "%s:\n", __func__);
+
+	is_sealed = sealed(di);
+	if (is_sealed)
+		return is_sealed;
+
+	if (di->chip == BQ276XX && !bq276xx_seal_enabled(di)) {
+		dev_dbg(di->dev, "%s: sealing is not enabled\n", __func__);
+		return is_sealed;
+	}
+
+	di->bus.write(di, BQ27XXX_REG_CTRL, SEAL_SUBCMD, false);
+
+	while (i < SEAL_UNSEAL_POLLING_RETRY_LIMIT) {
+		i++;
+		is_sealed = sealed(di);
+		if (is_sealed)
+			break;
+		msleep(10);
+	}
+
+	if (!is_sealed)
+		dev_err(di->dev, "%s: failed\n", __func__);
+
+	return is_sealed;
+}
+
+#define CFG_UPDATE_POLLING_RETRY_LIMIT 50
+static int enter_cfg_update_mode(struct bq27x00_device_info *di)
+{
+	int i = 0;
+	u16 flags;
+
+	dev_dbg(di->dev, "%s:\n", __func__);
+
+	if (!unseal(di, BQ274XX_UNSEAL_KEY))
+		return 0;
+
+	control_cmd_wr(di, SET_CFGUPDATE_SUBCMD);
+	msleep(5);
+
+	while (i < CFG_UPDATE_POLLING_RETRY_LIMIT) {
+		i++;
+		flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+		if (flags & (1 << 4))
+			break;
+		msleep(100);
+	}
+
+	if (i == CFG_UPDATE_POLLING_RETRY_LIMIT) {
+		dev_err(di->dev, "%s: failed %04x\n", __func__, flags);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int exit_cfg_update_mode(struct bq27x00_device_info *di)
+{
+	int i = 0;
+	u16 flags;
+
+	dev_dbg(di->dev, "%s:\n", __func__);
+
+	control_cmd_wr(di, BQ274XX_SOFT_RESET);
+
+	while (i < CFG_UPDATE_POLLING_RETRY_LIMIT) {
+		i++;
+		flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+		if (!(flags & (1 << 4)))
+			break;
+		msleep(100);
+	}
+
+	if (i == CFG_UPDATE_POLLING_RETRY_LIMIT) {
+		dev_err(di->dev, "%s: failed %04x\n", __func__, flags);
+		return 0;
+	}
+
+	if (seal(di))
+		return 1;
+	else
+		return 0;
+}
+static u8 checksum(u8 *data)
+{
+	u16 sum = 0;
+	int i;
+
+	for (i = 0; i < 32; i++)
+		sum += data[i];
+
+	sum &= 0xFF;
+
+	return 0xFF - sum;
+}
+
+#ifdef DEBUG
+static void print_buf(const char *msg, u8 *buf)
+{
+	int i;
+
+	printk("\nbq: %s buf: ", msg);
+	for (i = 0; i < 32; i++)
+		printk("%02x ", buf[i]);
+
+	printk("\n");
+}
+#else
+#define print_buf(a, b)
+#endif
+
+static int update_dm_block(struct bq27x00_device_info *di, u8 subclass,
+	u8 offset, u8 *data)
+{
+	u8 buf[32];
+	u8 cksum;
+	u8 blk_offset = offset >> 5;
+
+	dev_dbg(di->dev, "%s: subclass %d offset %d\n",
+		__func__, subclass, offset);
+
+	di->bus.write(di, BLOCK_DATA_CONTROL, 0, true);
+	msleep(5);
+
+	di->bus.write(di, BLOCK_DATA_CLASS, subclass, true);
+	msleep(5);
+
+	di->bus.write(di, DATA_BLOCK, blk_offset, true);
+	msleep(5);
+
+	di->bus.blk_write(di, BLOCK_DATA, data, 32);
+	msleep(5);
+	print_buf(__func__, data);
+
+	cksum = checksum(data);
+	di->bus.write(di, BLOCK_DATA_CHECKSUM, cksum, true);
+	msleep(5);
+
+	/* Read back and compare to make sure write is successful */
+	di->bus.write(di, DATA_BLOCK, blk_offset, true);
+	msleep(5);
+	di->bus.blk_read(di, BLOCK_DATA, buf, 32);
+	if (memcmp(data, buf, 32)) {
+		dev_err(di->dev, "%s: error updating subclass %d offset %d\n",
+			__func__, subclass, offset);
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+static int read_dm_block(struct bq27x00_device_info *di, u8 subclass,
+	u8 offset, u8 *data)
+{
+	u8 cksum_calc, cksum;
+	u8 blk_offset = offset >> 5;
+
+	dev_dbg(di->dev, "%s: subclass %d offset %d\n",
+		__func__, subclass, offset);
+
+	di->bus.write(di, BLOCK_DATA_CONTROL, 0, true);
+	msleep(5);
+
+	di->bus.write(di, BLOCK_DATA_CLASS, subclass, true);
+	msleep(5);
+
+	di->bus.write(di, DATA_BLOCK, blk_offset, true);
+	msleep(5);
+
+	di->bus.blk_read(di, BLOCK_DATA, data, 32);
+
+	cksum_calc = checksum(data);
+	cksum = di->bus.read(di, BLOCK_DATA_CHECKSUM, true);
+	if (cksum != cksum_calc) {
+		dev_err(di->dev, "%s: error reading subclass %d offset %d\n",
+			__func__, subclass, offset);
+		return 0;
+	}
+
+	print_buf(__func__, data);
+
+	return 1;
 }
 
 /*
- * Return the battery Relative State-of-Charge
+ * Return the battery State-of-Charge
  * Or < 0 if something fails.
  */
-static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
+static int bq27x00_battery_read_soc(struct bq27x00_device_info *di)
 {
-	int rsoc;
+	int soc;
 
-	if (di->chip == BQ27500)
-		rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
-	else if (di->chip == BQ27425)
-		rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
-	else
-		rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
+	soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 
-	if (rsoc < 0)
+	if (soc < 0)
 		dev_dbg(di->dev, "error reading relative State-of-Charge\n");
 
-	return rsoc;
+	return soc;
 }
 
 /*
@@ -209,17 +738,17 @@ static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 {
 	int charge;
 
-	charge = bq27x00_read(di, reg, false);
+	charge = bq27xxx_read(di, reg, false);
 	if (charge < 0) {
 		dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 			reg, charge);
 		return charge;
 	}
 
-	if (bq27xxx_is_chip_version_higher(di))
-		charge *= 1000;
+	if (di->chip == BQ27200)
+		charge = charge * 3570 / BQ27200_RS;
 	else
-		charge = charge * 3570 / BQ27000_RS;
+		charge *= 1000;
 
 	return charge;
 }
@@ -231,49 +760,46 @@ static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 {
 	int flags;
-	bool is_bq27500 = di->chip == BQ27500;
-	bool is_higher = bq27xxx_is_chip_version_higher(di);
 
-	flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
-	if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
-		return -ENODATA;
+	if (di->chip == BQ27200) {
+		flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
+		if (flags >= 0 && (flags & BQ27200_FLAG_CI))
+			return -ENODATA;
+	}
 
-	return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
+	return bq27x00_battery_read_charge(di, BQ27XXX_REG_NAC);
 }
 
 /*
  * Return the battery Last measured discharge in µAh
  * Or < 0 if something fails.
  */
-static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
+static inline int bq27x00_battery_read_fcc(struct bq27x00_device_info *di)
 {
-	return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
+	return bq27x00_battery_read_charge(di, BQ27XXX_REG_FCC);
 }
 
 /*
- * Return the battery Initial last measured discharge in µAh
+ * Return the Design Capacity in µAh
  * Or < 0 if something fails.
  */
-static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
+static int bq27x00_battery_read_dcap(struct bq27x00_device_info *di)
 {
-	int ilmd;
+	int dcap;
 
-	if (bq27xxx_is_chip_version_higher(di))
-		ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
-	else
-		ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
+	dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 
-	if (ilmd < 0) {
+	if (dcap < 0) {
 		dev_dbg(di->dev, "error reading initial last measured discharge\n");
-		return ilmd;
+		return dcap;
 	}
 
-	if (bq27xxx_is_chip_version_higher(di))
-		ilmd *= 1000;
+	if (di->chip == BQ27200)
+		dcap = dcap * 256 * 3570 / BQ27200_RS;
 	else
-		ilmd = ilmd * 256 * 3570 / BQ27000_RS;
+		dcap *= 1000;
 
-	return ilmd;
+	return dcap;
 }
 
 /*
@@ -284,16 +810,16 @@ static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 {
 	int ae;
 
-	ae = bq27x00_read(di, BQ27x00_REG_AE, false);
+	ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 	if (ae < 0) {
 		dev_dbg(di->dev, "error reading available energy\n");
 		return ae;
 	}
 
-	if (di->chip == BQ27500)
-		ae *= 1000;
+	if (di->chip == BQ27200)
+		ae = ae * 29200 / BQ27200_RS;
 	else
-		ae = ae * 29200 / BQ27000_RS;
+		ae *= 1000;
 
 	return ae;
 }
@@ -306,13 +832,13 @@ static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 {
 	int temp;
 
-	temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
+	temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 	if (temp < 0) {
 		dev_err(di->dev, "error reading temperature\n");
 		return temp;
 	}
 
-	if (!bq27xxx_is_chip_version_higher(di))
+	if (di->chip == BQ27200)
 		temp = 5 * temp / 2;
 
 	return temp;
@@ -326,7 +852,7 @@ static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 {
 	int cyct;
 
-	cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
+	cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 	if (cyct < 0)
 		dev_err(di->dev, "error reading cycle count total\n");
 
@@ -341,7 +867,7 @@ static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 {
 	int tval;
 
-	tval = bq27x00_read(di, reg, false);
+	tval = bq27xxx_read(di, reg, false);
 	if (tval < 0) {
 		dev_dbg(di->dev, "error reading time register %02x: %d\n",
 			reg, tval);
@@ -362,17 +888,25 @@ static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 {
 	int tval;
 
-	tval = bq27x00_read(di, reg, false);
+	tval = bq27xxx_read(di, reg, false);
 	if (tval < 0) {
 		dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 			reg, tval);
 		return tval;
 	}
 
-	if (di->chip == BQ27500)
+	if (di->chip == BQ27200)
+		return (tval * BQ27200_POWER_CONSTANT) / BQ27200_RS;
+	else
 		return tval;
+}
+
+static int overtemperature(struct bq27x00_device_info *di, u16 flags)
+{
+	if (di->chip == BQ27520)
+		return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 	else
-		return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
+		return flags & BQ27XXX_FLAG_OTC;
 }
 
 /*
@@ -381,25 +915,25 @@ static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
  */
 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 {
-	int tval;
+	u16 tval;
 
-	tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
+	tval = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 	if (tval < 0) {
 		dev_err(di->dev, "error reading flag register:%d\n", tval);
 		return tval;
 	}
 
-	if ((di->chip == BQ27500)) {
-		if (tval & BQ27500_FLAG_SOCF)
+	if ((di->chip == BQ27200)) {
+		if (tval & BQ27200_FLAG_EDV1)
 			tval = POWER_SUPPLY_HEALTH_DEAD;
-		else if (tval & BQ27500_FLAG_OTC)
-			tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 		else
 			tval = POWER_SUPPLY_HEALTH_GOOD;
 		return tval;
 	} else {
-		if (tval & BQ27000_FLAG_EDV1)
+		if (tval & BQ27XXX_FLAG_SOCF)
 			tval = POWER_SUPPLY_HEALTH_DEAD;
+		else if (overtemperature(di, tval))
+			tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 		else
 			tval = POWER_SUPPLY_HEALTH_GOOD;
 		return tval;
@@ -411,13 +945,14 @@ static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 static void bq27x00_update(struct bq27x00_device_info *di)
 {
 	struct bq27x00_reg_cache cache = {0, };
+	bool is_bq27200 = di->chip == BQ27200;
 	bool is_bq27500 = di->chip == BQ27500;
-	bool is_bq27425 = di->chip == BQ27425;
+	bool is_bq274xx = di->chip == BQ274XX;
+	bool is_bq276xx = di->chip == BQ276XX;
 
-	cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
+	cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, !is_bq27500);
 	if (cache.flags >= 0) {
-		if (!is_bq27500 && !is_bq27425
-				&& (cache.flags & BQ27000_FLAG_CI)) {
+		if (is_bq27200 && (cache.flags & BQ27200_FLAG_CI)) {
 			dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 			cache.capacity = -ENODATA;
 			cache.energy = -ENODATA;
@@ -427,31 +962,31 @@ static void bq27x00_update(struct bq27x00_device_info *di)
 			cache.charge_full = -ENODATA;
 			cache.health = -ENODATA;
 		} else {
-			cache.capacity = bq27x00_battery_read_rsoc(di);
-			if (!is_bq27425) {
+			cache.capacity = bq27x00_battery_read_soc(di);
+			if (!(is_bq274xx || is_bq276xx)) {
 				cache.energy = bq27x00_battery_read_energy(di);
 				cache.time_to_empty =
 					bq27x00_battery_read_time(di,
-							BQ27x00_REG_TTE);
+							BQ27XXX_REG_TTE);
 				cache.time_to_empty_avg =
 					bq27x00_battery_read_time(di,
-							BQ27x00_REG_TTECP);
+							BQ27XXX_REG_TTECP);
 				cache.time_to_full =
 					bq27x00_battery_read_time(di,
-							BQ27x00_REG_TTF);
+							BQ27XXX_REG_TTF);
 			}
-			cache.charge_full = bq27x00_battery_read_lmd(di);
+			cache.charge_full = bq27x00_battery_read_fcc(di);
 			cache.health = bq27x00_battery_read_health(di);
 		}
 		cache.temperature = bq27x00_battery_read_temperature(di);
-		if (!is_bq27425)
+		if (!is_bq274xx)
 			cache.cycle_count = bq27x00_battery_read_cyct(di);
 		cache.power_avg =
-			bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
+			bq27x00_battery_read_pwr_avg(di, BQ27XXX_POWER_AVG);
 
 		/* We only have to read charge design full once */
 		if (di->charge_design_full <= 0)
-			di->charge_design_full = bq27x00_battery_read_ilmd(di);
+			di->charge_design_full = bq27x00_battery_read_dcap(di);
 	}
 
 	if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
@@ -462,11 +997,131 @@ static void bq27x00_update(struct bq27x00_device_info *di)
 	di->last_update = jiffies;
 }
 
+static void copy_to_dm_buf_big_endian(struct bq27x00_device_info *di,
+	u8 *buf, u8 offset, u8 sz, u32 val)
+{
+	dev_dbg(di->dev, "%s: offset %d sz %d val %d\n",
+		__func__, offset, sz, val);
+
+	switch (sz) {
+	case 1:
+		buf[offset] = (u8) val;
+		break;
+	case 2:
+		put_unaligned_be16((u16) val, &buf[offset]);
+		break;
+	case 4:
+		put_unaligned_be32(val, &buf[offset]);
+		break;
+	default:
+		dev_err(di->dev, "%s: bad size for dm parameter - %d",
+			__func__, sz);
+		break;
+	}
+}
+
+static int rom_mode_gauge_init_completed(struct bq27x00_device_info *di)
+{
+	dev_dbg(di->dev, "%s:\n", __func__);
+
+	return control_cmd_read(di, CONTROL_STATUS_SUBCMD) &
+		BQ274XX_CTRL_STATUS_INITCOMP;
+}
+
+static bool rom_mode_gauge_dm_initialized(struct bq27x00_device_info *di)
+{
+	u16 flags;
+
+	flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+
+	dev_dbg(di->dev, "%s: flags - 0x%04x\n", __func__, flags);
+
+	if (flags & BQ274XX_FLAG_ITPOR)
+		return false;
+	else
+		return true;
+}
+
+#define INITCOMP_TIMEOUT_MS		10000
+static void rom_mode_gauge_dm_init(struct bq27x00_device_info *di)
+{
+	int i;
+	int timeout = INITCOMP_TIMEOUT_MS;
+	u8 subclass, offset;
+	u32 blk_number;
+	u32 blk_number_prev = 0;
+	u8 buf[32];
+	bool buf_valid = false;
+	struct dm_reg *dm_reg;
+
+	dev_dbg(di->dev, "%s:\n", __func__);
+
+	while (!rom_mode_gauge_init_completed(di) && timeout > 0) {
+		msleep(100);
+		timeout -= 100;
+	}
+
+	if (timeout <= 0) {
+		dev_err(di->dev, "%s: INITCOMP not set after %d seconds\n",
+			__func__, INITCOMP_TIMEOUT_MS/100);
+		return;
+	}
+
+	if (!di->dm_regs || !di->dm_regs_count) {
+		dev_err(di->dev, "%s: Data not available for DM initialization\n",
+			__func__);
+		return;
+	}
+
+	enter_cfg_update_mode(di);
+	for (i = 0; i < di->dm_regs_count; i++) {
+		dm_reg = &di->dm_regs[i];
+		subclass = dm_reg->subclass;
+		offset = dm_reg->offset;
+
+		/*
+		 * Create a composite block number to see if the subsequent
+		 * register also belongs to the same 32 btye block in the DM
+		 */
+		blk_number = subclass << 8;
+		blk_number |= offset >> 5;
+
+		if (blk_number == blk_number_prev) {
+			copy_to_dm_buf_big_endian(di, buf, offset,
+				dm_reg->len, dm_reg->data);
+		} else {
+
+			if (buf_valid)
+				update_dm_block(di, blk_number_prev >> 8,
+					(blk_number_prev << 5) & 0xFF , buf);
+			else
+				buf_valid = true;
+
+			read_dm_block(di, dm_reg->subclass, dm_reg->offset,
+				buf);
+			copy_to_dm_buf_big_endian(di, buf, offset,
+				dm_reg->len, dm_reg->data);
+		}
+		blk_number_prev = blk_number;
+	}
+
+	/* Last buffer to be written */
+	if (buf_valid)
+		update_dm_block(di, subclass, offset, buf);
+
+	exit_cfg_update_mode(di);
+}
+
 static void bq27x00_battery_poll(struct work_struct *work)
 {
 	struct bq27x00_device_info *di =
 		container_of(work, struct bq27x00_device_info, work.work);
 
+	if (((di->chip == BQ274XX) || (di->chip == BQ276XX)) &&
+		!rom_mode_gauge_dm_initialized(di)) {
+		rom_mode_gauge_dm_init(di);
+	}
+
 	bq27x00_update(di);
 
 	if (poll_interval > 0) {
@@ -487,23 +1142,23 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di,
 	int curr;
 	int flags;
 
-	curr = bq27x00_read(di, BQ27x00_REG_AI, false);
+	curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 	if (curr < 0) {
 		dev_err(di->dev, "error reading current\n");
 		return curr;
 	}
 
-	if (bq27xxx_is_chip_version_higher(di)) {
-		/* bq27500 returns signed value */
-		val->intval = (int)((s16)curr) * 1000;
-	} else {
-		flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
-		if (flags & BQ27000_FLAG_CHGS) {
+	if (di->chip == BQ27200) {
+		flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+		if (flags & BQ27200_FLAG_CHGS) {
 			dev_dbg(di->dev, "negative current!\n");
 			curr = -curr;
 		}
 
-		val->intval = curr * 3570 / BQ27000_RS;
+		val->intval = curr * 3570 / BQ27200_RS;
+	} else {
+		/* Other gauges return signed value */
+		val->intval = (int)((s16)curr) * 1000;
 	}
 
 	return 0;
@@ -514,22 +1169,22 @@ static int bq27x00_battery_status(struct bq27x00_device_info *di,
 {
 	int status;
 
-	if (bq27xxx_is_chip_version_higher(di)) {
-		if (di->cache.flags & BQ27500_FLAG_FC)
-			status = POWER_SUPPLY_STATUS_FULL;
-		else if (di->cache.flags & BQ27500_FLAG_DSC)
-			status = POWER_SUPPLY_STATUS_DISCHARGING;
-		else
-			status = POWER_SUPPLY_STATUS_CHARGING;
-	} else {
-		if (di->cache.flags & BQ27000_FLAG_FC)
+	if (di->chip == BQ27200) {
+		if (di->cache.flags & BQ27200_FLAG_FC)
 			status = POWER_SUPPLY_STATUS_FULL;
-		else if (di->cache.flags & BQ27000_FLAG_CHGS)
+		else if (di->cache.flags & BQ27200_FLAG_CHGS)
 			status = POWER_SUPPLY_STATUS_CHARGING;
 		else if (power_supply_am_i_supplied(&di->bat))
 			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 		else
 			status = POWER_SUPPLY_STATUS_DISCHARGING;
+	} else {
+		if (di->cache.flags & BQ27XXX_FLAG_FC)
+			status = POWER_SUPPLY_STATUS_FULL;
+		else if (di->cache.flags & BQ27XXX_FLAG_DSC)
+			status = POWER_SUPPLY_STATUS_DISCHARGING;
+		else
+			status = POWER_SUPPLY_STATUS_CHARGING;
 	}
 
 	val->intval = status;
@@ -542,21 +1197,21 @@ static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 {
 	int level;
 
-	if (bq27xxx_is_chip_version_higher(di)) {
-		if (di->cache.flags & BQ27500_FLAG_FC)
+	if (di->chip == BQ27200) {
+		if (di->cache.flags & BQ27200_FLAG_FC)
 			level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
-		else if (di->cache.flags & BQ27500_FLAG_SOC1)
+		else if (di->cache.flags & BQ27200_FLAG_EDV1)
 			level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
-		else if (di->cache.flags & BQ27500_FLAG_SOCF)
+		else if (di->cache.flags & BQ27200_FLAG_EDVF)
 			level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 		else
 			level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 	} else {
-		if (di->cache.flags & BQ27000_FLAG_FC)
+		if (di->cache.flags & BQ27XXX_FLAG_FC)
 			level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
-		else if (di->cache.flags & BQ27000_FLAG_EDV1)
+		else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 			level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
-		else if (di->cache.flags & BQ27000_FLAG_EDVF)
+		else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 			level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 		else
 			level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
@@ -576,7 +1231,7 @@ static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 {
 	int volt;
 
-	volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
+	volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 	if (volt < 0) {
 		dev_err(di->dev, "error reading voltage\n");
 		return volt;
@@ -690,17 +1345,41 @@ static void bq27x00_external_power_changed(struct power_supply *psy)
 	schedule_delayed_work(&di->work, 0);
 }
 
-static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
+static void __init set_properties_array(struct bq27x00_device_info *di,
+	enum power_supply_property *props, int num_props)
+{
+	int tot_sz = num_props * sizeof(enum power_supply_property);
+
+	di->bat.properties = devm_kzalloc(di->dev, tot_sz, GFP_KERNEL);
+
+	if (di->bat.properties) {
+		memcpy(di->bat.properties, props, tot_sz);
+		di->bat.num_properties = num_props;
+	} else {
+		di->bat.num_properties = 0;
+	}
+}
+
+static int __init bq27x00_powersupply_init(struct bq27x00_device_info *di)
 {
 	int ret;
 
 	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
-	if (di->chip == BQ27425) {
-		di->bat.properties = bq27425_battery_props;
-		di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
+	if (di->chip == BQ274XX) {
+		set_properties_array(di, bq274xx_battery_props,
+			ARRAY_SIZE(bq274xx_battery_props));
+	} else if (di->chip == BQ276XX) {
+		set_properties_array(di, bq276xx_battery_props,
+			ARRAY_SIZE(bq276xx_battery_props));
+	} else if (di->chip == BQ27520) {
+		set_properties_array(di, bq27520_battery_props,
+			ARRAY_SIZE(bq27520_battery_props));
+	} else if (di->chip == BQ2753X) {
+		set_properties_array(di, bq2753x_battery_props,
+			ARRAY_SIZE(bq2753x_battery_props));
 	} else {
-		di->bat.properties = bq27x00_battery_props;
-		di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
+		set_properties_array(di, bq27x00_battery_props,
+			ARRAY_SIZE(bq27x00_battery_props));
 	}
 	di->bat.get_property = bq27x00_battery_get_property;
 	di->bat.external_power_changed = bq27x00_external_power_changed;
@@ -748,7 +1427,7 @@ static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 static DEFINE_IDR(battery_id);
 static DEFINE_MUTEX(battery_mutex);
 
-static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
+static int bq27xxx_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 {
 	struct i2c_client *client = to_i2c_client(di->dev);
 	struct i2c_msg msg[2];
@@ -782,20 +1461,205 @@ static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 	return ret;
 }
 
-static int bq27x00_battery_probe(struct i2c_client *client,
+static int bq27xxx_write_i2c(struct bq27x00_device_info *di, u8 reg, int value, bool single)
+{
+	struct i2c_client *client = to_i2c_client(di->dev);
+	struct i2c_msg msg;
+	unsigned char data[4];
+	int ret;
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	data[0] = reg;
+	if (single) {
+		data[1] = (unsigned char)value;
+		msg.len = 2;
+	} else {
+		put_unaligned_le16(value, &data[1]);
+		msg.len = 3;
+	}
+
+	msg.buf = data;
+	msg.addr = client->addr;
+	msg.flags = 0;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int bq27xxx_read_i2c_blk(struct bq27x00_device_info *di, u8 reg,
+	u8 *data, u8 len)
+{
+	struct i2c_client *client = to_i2c_client(di->dev);
+	struct i2c_msg msg[2];
+	int ret;
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	msg[0].addr = client->addr;
+	msg[0].flags = 0;
+	msg[0].buf = &reg;
+	msg[0].len = 1;
+
+	msg[1].addr = client->addr;
+	msg[1].flags = I2C_M_RD;
+	msg[1].buf = data;
+	msg[1].len = len;
+
+	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+	if (ret < 0)
+		return ret;
+
+	return ret;
+}
+
+static int bq27xxx_write_i2c_blk(struct bq27x00_device_info *di, u8 reg,
+	u8 *data, u8 sz)
+{
+	struct i2c_client *client = to_i2c_client(di->dev);
+	struct i2c_msg msg;
+	int ret;
+	u8 buf[33];
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	buf[0] = reg;
+	memcpy(&buf[1], data, sz);
+
+	msg.buf = buf;
+	msg.addr = client->addr;
+	msg.flags = 0;
+	msg.len = sz + 1;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int bq27x00_battery_reset(struct bq27x00_device_info *di)
+{
+	dev_info(di->dev, "Gas Gauge Reset\n");
+
+	bq27xxx_write(di, BQ27XXX_REG_CTRL, RESET_SUBCMD, false);
+
+	msleep(10);
+
+	return bq27xxx_read(di, BQ27XXX_REG_CTRL, false);
+}
+
+static int bq27x00_battery_read_fw_version(struct bq27x00_device_info *di)
+{
+	bq27xxx_write(di, BQ27XXX_REG_CTRL, FW_VER_SUBCMD, false);
+
+	msleep(10);
+
+	return bq27xxx_read(di, BQ27XXX_REG_CTRL, false);
+}
+
+static int bq27x00_battery_read_device_type(struct bq27x00_device_info *di)
+{
+	bq27xxx_write(di, BQ27XXX_REG_CTRL, DEV_TYPE_SUBCMD, false);
+
+	msleep(10);
+
+	return bq27xxx_read(di, BQ27XXX_REG_CTRL, false);
+}
+
+static int bq27x00_battery_read_dataflash_version(struct bq27x00_device_info *di)
+{
+	bq27xxx_write(di, BQ27XXX_REG_CTRL, DF_VER_SUBCMD, false);
+
+	msleep(10);
+
+	return bq27xxx_read(di, BQ27XXX_REG_CTRL, false);
+}
+
+static ssize_t show_firmware_version(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct bq27x00_device_info *di = dev_get_drvdata(dev);
+	int ver;
+
+	ver = bq27x00_battery_read_fw_version(di);
+
+	return sprintf(buf, "%d\n", ver);
+}
+
+static ssize_t show_dataflash_version(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct bq27x00_device_info *di = dev_get_drvdata(dev);
+	int ver;
+
+	ver = bq27x00_battery_read_dataflash_version(di);
+
+	return sprintf(buf, "%d\n", ver);
+}
+
+static ssize_t show_device_type(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct bq27x00_device_info *di = dev_get_drvdata(dev);
+	int dev_type;
+
+	dev_type = bq27x00_battery_read_device_type(di);
+
+	return sprintf(buf, "%d\n", dev_type);
+}
+
+static ssize_t show_reset(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct bq27x00_device_info *di = dev_get_drvdata(dev);
+
+	bq27x00_battery_reset(di);
+
+	return sprintf(buf, "okay\n");
+}
+
+static DEVICE_ATTR(fw_version, S_IRUGO, show_firmware_version, NULL);
+static DEVICE_ATTR(df_version, S_IRUGO, show_dataflash_version, NULL);
+static DEVICE_ATTR(device_type, S_IRUGO, show_device_type, NULL);
+static DEVICE_ATTR(reset, S_IRUGO, show_reset, NULL);
+
+static struct attribute *bq27x00_attributes[] = {
+	&dev_attr_fw_version.attr,
+	&dev_attr_df_version.attr,
+	&dev_attr_device_type.attr,
+	&dev_attr_reset.attr,
+	NULL
+};
+
+static const struct attribute_group bq27x00_attr_group = {
+	.attrs = bq27x00_attributes,
+};
+
+static int __init bq27x00_battery_probe(struct i2c_client *client,
 				 const struct i2c_device_id *id)
 {
 	char *name;
 	struct bq27x00_device_info *di;
 	int num;
 	int retval = 0;
+	u8 *regs;
 
 	/* Get new ID for the new battery device */
+	retval = idr_pre_get(&battery_id, GFP_KERNEL);
+	if (retval == 0)
+		return -ENOMEM;
 	mutex_lock(&battery_mutex);
-	num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
+	retval = idr_get_new(&battery_id, client, &num);
 	mutex_unlock(&battery_mutex);
-	if (num < 0)
-		return num;
+	if (retval < 0)
+		return retval;
 
 	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 	if (!name) {
@@ -815,13 +1679,52 @@ static int bq27x00_battery_probe(struct i2c_client *client,
 	di->dev = &client->dev;
 	di->chip = id->driver_data;
 	di->bat.name = name;
-	di->bus.read = &bq27x00_read_i2c;
+	di->bus.read = &bq27xxx_read_i2c;
+	di->bus.write = &bq27xxx_write_i2c;
+	di->bus.blk_read = bq27xxx_read_i2c_blk;
+	di->bus.blk_write = bq27xxx_write_i2c_blk;
+	di->dm_regs = NULL;
+	di->dm_regs_count = 0;
+
+	if (di->chip == BQ27200)
+		regs = bq27200_regs;
+	else if (di->chip == BQ27500)
+		regs = bq27500_regs;
+	else if (di->chip == BQ27520)
+		regs = bq27520_regs;
+	else if (di->chip == BQ2753X)
+		regs = bq2753x_regs;
+	else if (di->chip == BQ274XX) {
+		regs = bq274xx_regs;
+		di->dm_regs = bq274xx_dm_regs;
+		di->dm_regs_count = ARRAY_SIZE(bq274xx_dm_regs);
+	} else if (di->chip == BQ276XX) {
+		/* commands are same as bq274xx, only DM is different */
+		regs = bq276xx_regs;
+		di->dm_regs = bq276xx_dm_regs;
+		di->dm_regs_count = ARRAY_SIZE(bq276xx_dm_regs);
+	} else {
+		dev_err(&client->dev,
+			"Unexpected gas gague: %d\n", di->chip);
+		regs = bq27520_regs;
+	}
+
+	memcpy(di->regs, regs, NUM_REGS);
+
+	di->fw_ver = bq27x00_battery_read_fw_version(di);
+	dev_info(&client->dev, "Gas Guage fw version is 0x%04x\n", di->fw_ver);
 
 	retval = bq27x00_powersupply_init(di);
 	if (retval)
 		goto batt_failed_3;
 
+	/* Schedule a polling after about 1 min */
+	schedule_delayed_work(&di->work, 60 * HZ);
+
 	i2c_set_clientdata(client, di);
+	retval = sysfs_create_group(&client->dev.kobj, &bq27x00_attr_group);
+	if (retval)
+		dev_err(&client->dev, "could not create sysfs files\n");
 
 	return 0;
 
@@ -855,9 +1758,12 @@ static int bq27x00_battery_remove(struct i2c_client *client)
 }
 
 static const struct i2c_device_id bq27x00_id[] = {
-	{ "bq27200", BQ27000 },	/* bq27200 is same as bq27000, but with i2c */
+	{ "bq27200", BQ27200 },
 	{ "bq27500", BQ27500 },
-	{ "bq27425", BQ27425 },
+	{ "bq27520", BQ27520 },
+	{ "bq274xx", BQ274XX },
+	{ "bq276xx", BQ276XX },
+	{ "bq2753x", BQ2753X },
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
@@ -871,7 +1777,7 @@ static struct i2c_driver bq27x00_battery_driver = {
 	.id_table = bq27x00_id,
 };
 
-static inline int bq27x00_battery_i2c_init(void)
+static inline int __init bq27x00_battery_i2c_init(void)
 {
 	int ret = i2c_add_driver(&bq27x00_battery_driver);
 	if (ret)
@@ -880,7 +1786,7 @@ static inline int bq27x00_battery_i2c_init(void)
 	return ret;
 }
 
-static inline void bq27x00_battery_i2c_exit(void)
+static inline void __exit bq27x00_battery_i2c_exit(void)
 {
 	i2c_del_driver(&bq27x00_battery_driver);
 }
@@ -929,7 +1835,7 @@ static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 	return pdata->read(dev, reg);
 }
 
-static int bq27000_battery_probe(struct platform_device *pdev)
+static int __devinit bq27000_battery_probe(struct platform_device *pdev)
 {
 	struct bq27x00_device_info *di;
 	struct bq27000_platform_data *pdata = pdev->dev.platform_data;
@@ -954,7 +1860,7 @@ static int bq27000_battery_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, di);
 
 	di->dev = &pdev->dev;
-	di->chip = BQ27000;
+	di->chip = BQ27200;
 
 	di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 	di->bus.read = &bq27000_read_platform;
@@ -966,27 +1872,25 @@ static int bq27000_battery_probe(struct platform_device *pdev)
 	return 0;
 
 err_free:
-	platform_set_drvdata(pdev, NULL);
 	kfree(di);
 
 	return ret;
 }
 
-static int bq27000_battery_remove(struct platform_device *pdev)
+static int __devexit bq27000_battery_remove(struct platform_device *pdev)
 {
 	struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 
 	bq27x00_powersupply_unregister(di);
 
-	platform_set_drvdata(pdev, NULL);
 	kfree(di);
 
 	return 0;
 }
 
-static struct platform_driver bq27000_battery_driver = {
+static struct platform_driver __initdata bq27000_battery_driver = {
 	.probe	= bq27000_battery_probe,
-	.remove = bq27000_battery_remove,
+	.remove = __devexit_p(bq27000_battery_remove),
 	.driver = {
 		.name = "bq27000-battery",
 		.owner = THIS_MODULE,
@@ -997,7 +1901,7 @@ static inline int bq27x00_battery_platform_init(void)
 {
 	int ret = platform_driver_register(&bq27000_battery_driver);
 	if (ret)
-		printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
+		printk(KERN_ERR "Unable to register BQ27200 platform driver\n");
 
 	return ret;
 }