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Message-id: <4A25DB40.6010904@samsung.com>
Date: Wed, 03 Jun 2009 11:09:04 +0900
From: Minkyu Kang <mk7.kang@...sung.com>
To: linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
kyungmin.park@...sung.com
Subject: [PATCH] add MAX17040 Fuel Gauge driver
The MAX17040 is a I2C interfaced Fuel Gauge systems for lithium-ion batteries
This patch adds support the MAX17040 Fuel Gauge
Signed-off-by: Minkyu Kang <mk7.kang@...sung.com>
---
drivers/power/Kconfig | 8 +
drivers/power/Makefile | 3 +-
drivers/power/max17040_battery.c | 304 ++++++++++++++++++++++++++++++++++++++
include/linux/max17040_battery.h | 19 +++
4 files changed, 333 insertions(+), 1 deletions(-)
create mode 100644 drivers/power/max17040_battery.c
create mode 100644 include/linux/max17040_battery.h
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 33da112..6af5798 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -88,4 +88,12 @@ config CHARGER_PCF50633
help
Say Y to include support for NXP PCF50633 Main Battery Charger.
+config BATTERY_MAX17040
+ tristate "Maxim MAX17040 Fuel Gauge"
+ depends on I2C
+ help
+ MAX17040 is fuel-gauge systems for lithium-ion (Li+) batteries
+ in handheld and portable equipment. The MAX17040 is configured
+ to operate with a single lithium cell
+
endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 2fcf41d..9c48995 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -25,4 +25,5 @@ obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o
obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o
obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
-obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
\ No newline at end of file
+obj-$(CONFIG_BATTERY_MAX17040)) += max17040_battery.o
+obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
diff --git a/drivers/power/max17040_battery.c b/drivers/power/max17040_battery.c
new file mode 100644
index 0000000..9bee171
--- /dev/null
+++ b/drivers/power/max17040_battery.c
@@ -0,0 +1,304 @@
+/*
+ * max17040_battery.c
+ * fuel-gauge systems for lithium-ion (Li+) batteries
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Minkyu Kang <mk7.kang@...sung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#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/max17040_battery.h>
+
+#define MAX17040_VCELL_MSB 0x02
+#define MAX17040_VCELL_LSB 0x03
+#define MAX17040_SOC_MSB 0x04
+#define MAX17040_SOC_LSB 0x05
+#define MAX17040_MODE_MSB 0x06
+#define MAX17040_MODE_LSB 0x07
+#define MAX17040_VER_MSB 0x08
+#define MAX17040_VER_LSB 0x09
+#define MAX17040_RCOMP_MSB 0x0C
+#define MAX17040_RCOMP_LSB 0x0D
+#define MAX17040_CMD_MSB 0xFE
+#define MAX17040_CMD_LSB 0xFF
+
+#define MAX17040_DELAY 1000
+#define MAX17040_BATTERY_FULL 95
+
+struct max17040_chip {
+ struct i2c_client *client;
+ struct delayed_work work;
+
+ /* State Of Connect */
+ int online;
+ /* battery voltage */
+ int vcell;
+ /* battery capacity */
+ int soc;
+ /* State Of Charge */
+ int status;
+};
+
+static struct max17040_chip *max17040;
+static struct max17040_platform_data *pdata;
+
+static int max17040_get_property(struct power_supply *bat_ps,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = max17040->status;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = max17040->online;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = max17040->vcell;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = max17040->soc;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct power_supply bat_ps = {
+ .name = "battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = max17040_get_property,
+};
+
+static int max17040_write_reg(int reg, u8 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(max17040->client, reg, value);
+
+ if (ret < 0) {
+ dev_err(&max17040->client->dev,
+ "%s: reg 0x%x, val 0x%x, err %d\n",
+ __func__, reg, value, ret);
+ }
+
+ return ret;
+}
+
+static u8 max17040_read_reg(int reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(max17040->client, reg);
+
+ if (ret < 0) {
+ dev_err(&max17040->client->dev,
+ "%s: reg 0x%x, err %d\n",
+ __func__, reg, ret);
+ }
+
+ return ret;
+}
+
+static void max17040_reset(void)
+{
+ max17040_write_reg(MAX17040_CMD_MSB, 0x54);
+ max17040_write_reg(MAX17040_CMD_LSB, 0x00);
+}
+
+static void max17040_set_rcomp(u16 val)
+{
+ max17040_write_reg(MAX17040_RCOMP_MSB, val >> 8);
+ max17040_write_reg(MAX17040_RCOMP_LSB, (val << 8) >> 8);
+}
+
+static void max17040_get_vcell(void)
+{
+ u8 msb;
+ u8 lsb;
+
+ msb = max17040_read_reg(MAX17040_VCELL_MSB);
+ lsb = max17040_read_reg(MAX17040_VCELL_LSB);
+
+ max17040->vcell = (msb << 4) + (lsb >> 4);
+}
+
+static void max17040_get_soc(void)
+{
+ u8 msb;
+ u8 lsb;
+
+ msb = max17040_read_reg(MAX17040_SOC_MSB);
+ lsb = max17040_read_reg(MAX17040_SOC_LSB);
+
+ max17040->soc = msb;
+}
+
+static void max17040_get_version(void)
+{
+ u8 msb;
+ u8 lsb;
+
+ msb = max17040_read_reg(MAX17040_VER_MSB);
+ lsb = max17040_read_reg(MAX17040_VER_LSB);
+
+ dev_info(&max17040->client->dev,
+ "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb);
+}
+
+static void max17040_get_online(void)
+{
+ if (pdata->battery_online)
+ max17040->online = pdata->battery_online();
+ else
+ max17040->online = 1;
+}
+
+static void max17040_get_status(void)
+{
+ if (!pdata->charger_online || !pdata->charger_enable) {
+ max17040->status = POWER_SUPPLY_STATUS_UNKNOWN;
+ return;
+ }
+
+ if (pdata->charger_online()) {
+ if (pdata->charger_enable())
+ max17040->status = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ max17040->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ } else {
+ max17040->status = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+
+ if (max17040->soc > MAX17040_BATTERY_FULL)
+ max17040->status = POWER_SUPPLY_STATUS_FULL;
+}
+
+static void max17040_work(struct work_struct *work)
+{
+ max17040_get_vcell();
+ max17040_get_soc();
+ max17040_get_online();
+ max17040_get_status();
+
+ schedule_delayed_work(&max17040->work, MAX17040_DELAY);
+}
+
+static enum power_supply_property max17040_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+};
+
+static int __devinit max17040_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max17040_chip *chip;
+ int ret;
+
+ chip = kzalloc(sizeof(struct max17040_chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+ pdata = client->dev.platform_data;
+
+ i2c_set_clientdata(client, chip);
+ max17040 = chip;
+
+ max17040_reset();
+
+ max17040_get_version();
+
+ INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17040_work);
+ schedule_delayed_work(&chip->work, MAX17040_DELAY);
+
+ bat_ps.properties = max17040_battery_props;
+ bat_ps.num_properties = ARRAY_SIZE(max17040_battery_props);
+
+ ret = power_supply_register(&client->dev, &bat_ps);
+ if (ret) {
+ dev_err(&max17040->client->dev,
+ "failed: power supply register\n");
+ kfree(chip);
+ max17040 = NULL;
+ i2c_set_clientdata(client, NULL);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int __devexit max17040_remove(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ kfree(chip);
+ max17040 = NULL;
+ i2c_set_clientdata(client, NULL);
+ power_supply_unregister(&bat_ps);
+ return 0;
+}
+
+static int max17040_suspend(struct i2c_client *client,
+ pm_message_t state)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ cancel_delayed_work(&chip->work);
+ return 0;
+}
+
+static int max17040_resume(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ schedule_delayed_work(&chip->work, MAX17040_DELAY);
+ return 0;
+}
+
+static const struct i2c_device_id max17040_id[] = {
+ { "max17040", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max17040_id);
+
+static struct i2c_driver max17040_i2c_driver = {
+ .driver = {
+ .name = "max17040",
+ },
+ .probe = max17040_probe,
+ .remove = __devexit_p(max17040_remove),
+ .suspend = max17040_suspend,
+ .resume = max17040_resume,
+ .id_table = max17040_id,
+};
+
+static int __init max17040_init(void)
+{
+ return i2c_add_driver(&max17040_i2c_driver);
+}
+module_init(max17040_init);
+
+static void __exit max17040_exit(void)
+{
+ i2c_del_driver(&max17040_i2c_driver);
+}
+module_exit(max17040_exit);
+
+MODULE_AUTHOR("Minkyu Kang <mk7.kang@...sung.com>");
+MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/max17040_battery.h b/include/linux/max17040_battery.h
new file mode 100644
index 0000000..ad97b06
--- /dev/null
+++ b/include/linux/max17040_battery.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2009 Samsung Electronics
+ * Minkyu Kang <mk7.kang@...sung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __MAX17040_BATTERY_H_
+#define __MAX17040_BATTERY_H_
+
+struct max17040_platform_data {
+ int (*battery_online)(void);
+ int (*charger_online)(void);
+ int (*charger_enable)(void);
+};
+
+#endif
--
1.5.4.3
--
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