From 04750447124143dfc9444a0c3335ffc9636e1df8 Mon Sep 17 00:00:00 2001
From: Piotr Wilczek <p.wilczek@samsung.com>
Date: Tue, 24 Sep 2013 16:31:22 +0200
Subject: drivers:power:max77693: add support for new multi function pmic
 max77693

This patch add support for new multi function pmic max77693.
The driver is split into three modules: pmic, muic and fuelgage.

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
---
 drivers/power/mfd/fg_max77693.c | 139 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 drivers/power/mfd/fg_max77693.c

(limited to 'drivers/power/mfd/fg_max77693.c')

diff --git a/drivers/power/mfd/fg_max77693.c b/drivers/power/mfd/fg_max77693.c
new file mode 100644
index 0000000..4519fed
--- /dev/null
+++ b/drivers/power/mfd/fg_max77693.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics
+ * Piotr Wilczek <p.wilczek@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <power/pmic.h>
+#include <power/max77693_fg.h>
+#include <i2c.h>
+#include <power/power_chrg.h>
+#include <power/battery.h>
+#include <power/fg_battery_cell_params.h>
+#include <errno.h>
+
+static int max77693_get_vcell(u32 *vcell)
+{
+	u16 value;
+	u8 ret;
+
+	ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VCELL, 1,
+		       (u8 *)&value, 2);
+	if (ret)
+		return ret;
+
+	*vcell = (u32)(value >> 3);
+	*vcell = *vcell * 625;
+
+	return 0;
+}
+
+static int max77693_get_soc(u32 *soc)
+{
+	u16 value;
+	u8 ret;
+
+	ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VFSOC, 1,
+		       (u8 *)&value, 2);
+	if (ret)
+		return ret;
+
+	*soc = (u32)(value >> 8);
+
+	return 0;
+}
+
+static int power_update_battery(struct pmic *p, struct pmic *bat)
+{
+	struct power_battery *pb = bat->pbat;
+	int ret;
+
+	if (pmic_probe(p)) {
+		puts("Can't find max77693 fuel gauge\n");
+		return -1;
+	}
+
+	ret = max77693_get_soc(&pb->bat->state_of_chrg);
+	if (ret)
+		return ret;
+
+	max77693_get_vcell(&pb->bat->voltage_uV);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int power_check_battery(struct pmic *p, struct pmic *bat)
+{
+	struct power_battery *pb = bat->pbat;
+	unsigned int val;
+	int ret = 0;
+
+	if (pmic_probe(p)) {
+		puts("Can't find max77693 fuel gauge\n");
+		return -1;
+	}
+
+	ret = pmic_reg_read(p, MAX77693_STATUS, &val);
+	if (ret)
+		return ret;
+	debug("fg status: 0x%x\n", val);
+
+	ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version);
+	if (ret)
+		return ret;
+
+	ret = power_update_battery(p, bat);
+	if (ret)
+		return ret;
+	debug("fg ver: 0x%x\n", pb->bat->version);
+	printf("BAT: state_of_charge(SOC):%d%%\n",
+	       pb->bat->state_of_chrg);
+
+	printf("     voltage: %d.%6.6d [V] (expected to be %d [mAh])\n",
+	       pb->bat->voltage_uV / 1000000,
+	       pb->bat->voltage_uV % 1000000,
+	       pb->bat->capacity);
+
+	if (pb->bat->voltage_uV > 3850000)
+		pb->bat->state = EXT_SOURCE;
+	else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5)
+		pb->bat->state = CHARGE;
+	else
+		pb->bat->state = NORMAL;
+
+	return 0;
+}
+
+static struct power_fg power_fg_ops = {
+	.fg_battery_check = power_check_battery,
+	.fg_battery_update = power_update_battery,
+};
+
+int power_fg_init(unsigned char bus)
+{
+	static const char name[] = "MAX77693_FG";
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	debug("Board Fuel Gauge init\n");
+
+	p->name = name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = FG_NUM_OF_REGS;
+	p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR;
+	p->hw.i2c.tx_num = 2;
+	p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG;
+	p->bus = bus;
+
+	p->fg = &power_fg_ops;
+
+	return 0;
+}
-- 
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