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Message-ID: <1310633828.284.88.camel@L-0532.kpit.com>
Date: Thu, 14 Jul 2011 14:27:08 +0530
From: ashishj3 <ashish.jangam@...tcummins.com>
To: Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC: <linaro-dev@...ts.linaro.org>, <cbou@...l.ru>,
<dwmw2@...radead.org>, <linux-kernel@...r.kernel.org>
Subject: [Patch v1 04/11]Power: DA9052 battery driver
Driver for DA9052 battery charger. This driver depends on DA9052 MFD core dirver
for definitions and methods.
Signed-off-by: David Dajun Chen <dchen@...semi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@...tcummins.com>
---
drivers/power/Kconfig | 7 +
drivers/power/Makefile | 1 +
drivers/power/da9052-battery.c | 602 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 610 insertions(+), 0 deletions(-)
create mode 100755 drivers/power/da9052-battery.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index cc019c9..0cee85a 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -142,6 +142,13 @@ config BATTERY_DA9030
Say Y here to enable support for batteries charger integrated into
DA9030 PMIC.
+config BATTERY_DA9052
+ tristate "Dialog DA9052 Battery"
+ depends on PMIC_DA9052
+ help
+ Say Y here to enable support for batteries charger integrated into
+ DA9052 PMIC.
+
config BATTERY_MAX17040
tristate "Maxim MAX17040 Fuel Gauge"
depends on I2C
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 8fcd93f..933d121 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o
obj-$(CONFIG_BATTERY_BQ20Z75) += bq20z75.o
obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
+obj-$(CONFIG_BATTERY_DA9052) += da9052-battery.o
obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
obj-$(CONFIG_BATTERY_MAX17042) += max17042_battery.o
obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
diff --git a/drivers/power/da9052-battery.c b/drivers/power/da9052-battery.c
new file mode 100755
index 0000000..7831cb3
--- /dev/null
+++ b/drivers/power/da9052-battery.c
@@ -0,0 +1,607 @@
+/*
+ * Batttery Driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+
+ * Author: Dajun Chen <dchen@...semi.com>
+ *
+ * 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; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/uaccess.h>
+#include <linux/jiffies.h>
+#include <linux/power_supply.h>
+#include <linux/platform_device.h>
+#include <linux/freezer.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+/* STATIC CONFIGURATION */
+#define DA9052_BAT_CUTOFF_VOLT 2800
+#define DA9052_BAT_THRESHOLD 62
+#define DA9052_BAT_CAPACITY_LIMIT_LOW 4
+#define DA9052_AVERAGE_SIZE 4
+#define DA9052_LOOK_UP_TABLE_SIZE 68
+#define DA9052_NO_OF_LOOKUP_TABLE 3
+#define DA9052_IRQ_DCIN 0
+#define DA9052_IRQ_VBUS 1
+#define DA9052_IRQ_DCINREM 2
+#define DA9052_IRQ_VBUSREM 3
+#define DA9052_IRQ_TBAT 12
+#define DA9052_IRQ_CHGEND 11
+
+enum charger_type_enum {
+ DA9052_NOCHARGER = 1,
+ DA9052_USB_HUB,
+ DA9052_USB_CHARGER,
+ DA9052_WALL_CHARGER,
+};
+
+static const u16 temperature_lookup_ref[3] = {10, 25, 40};
+static u32 const vbat_vs_capacity_look_up[3][68][2] = {
+ /* For temperature 10 degree celisus*/
+ {
+ {4082, 100}, {4036, 98},
+ {4020, 96}, {4008, 95},
+ {3997, 93}, {3983, 91},
+ {3964, 90}, {3943, 88},
+ {3926, 87}, {3912, 85},
+ {3900, 84}, {3890, 82},
+ {3881, 80}, {3873, 79},
+ {3865, 77}, {3857, 76},
+ {3848, 74}, {3839, 73},
+ {3829, 71}, {3820, 70},
+ {3811, 68}, {3802, 67},
+ {3794, 65}, {3785, 64},
+ {3778, 62}, {3770, 61},
+ {3763, 59}, {3756, 58},
+ {3750, 56}, {3744, 55},
+ {3738, 53}, {3732, 52},
+ {3727, 50}, {3722, 49},
+ {3717, 47}, {3712, 46},
+ {3708, 44}, {3703, 43},
+ {3700, 41}, {3696, 40},
+ {3693, 38}, {3691, 37},
+ {3688, 35}, {3686, 34},
+ {3683, 32}, {3681, 31},
+ {3678, 29}, {3675, 28},
+ {3672, 26}, {3669, 25},
+ {3665, 23}, {3661, 22},
+ {3656, 21}, {3651, 19},
+ {3645, 18}, {3639, 16},
+ {3631, 15}, {3622, 13},
+ {3611, 12}, {3600, 10},
+ {3587, 9}, {3572, 7},
+ {3548, 6}, {3503, 5},
+ {3420, 3}, {3268, 2},
+ {2992, 1}, {2746, 0}
+ },
+ /* For temperature 25 degree celisus */
+ {
+ {4102, 100}, {4065, 98},
+ {4048, 96}, {4034, 95},
+ {4021, 93}, {4011, 92},
+ {4001, 90}, {3986, 88},
+ {3968, 87}, {3952, 85},
+ {3938, 84}, {3926, 82},
+ {3916, 81}, {3908, 79},
+ {3900, 77}, {3892, 76},
+ {3883, 74}, {3874, 73},
+ {3864, 71}, {3855, 70},
+ {3846, 68}, {3836, 67},
+ {3827, 65}, {3819, 64},
+ {3810, 62}, {3801, 61},
+ {3793, 59}, {3786, 58},
+ {3778, 56}, {3772, 55},
+ {3765, 53}, {3759, 52},
+ {3754, 50}, {3748, 49},
+ {3743, 47}, {3738, 46},
+ {3733, 44}, {3728, 43},
+ {3724, 41}, {3720, 40},
+ {3716, 38}, {3712, 37},
+ {3709, 35}, {3706, 34},
+ {3703, 33}, {3701, 31},
+ {3698, 30}, {3696, 28},
+ {3693, 27}, {3690, 25},
+ {3687, 24}, {3683, 22},
+ {3680, 21}, {3675, 19},
+ {3671, 18}, {3666, 17},
+ {3660, 15}, {3654, 14},
+ {3647, 12}, {3639, 11},
+ {3630, 9}, {3621, 8},
+ {3613, 6}, {3606, 5},
+ {3597, 4}, {3582, 2},
+ {3546, 1}, {2747, 0}
+ },
+ /* For temperature 40 degree celisus*/
+ {
+ {4114, 100}, {4081, 98},
+ {4065, 96}, {4050, 95},
+ {4036, 93}, {4024, 92},
+ {4013, 90}, {4002, 88},
+ {3990, 87}, {3976, 85},
+ {3962, 84}, {3950, 82},
+ {3939, 81}, {3930, 79},
+ {3921, 77}, {3912, 76},
+ {3902, 74}, {3893, 73},
+ {3883, 71}, {3874, 70},
+ {3865, 68}, {3856, 67},
+ {3847, 65}, {3838, 64},
+ {3829, 62}, {3820, 61},
+ {3812, 59}, {3803, 58},
+ {3795, 56}, {3787, 55},
+ {3780, 53}, {3773, 52},
+ {3767, 50}, {3761, 49},
+ {3756, 47}, {3751, 46},
+ {3746, 44}, {3741, 43},
+ {3736, 41}, {3732, 40},
+ {3728, 38}, {3724, 37},
+ {3720, 35}, {3716, 34},
+ {3713, 33}, {3710, 31},
+ {3707, 30}, {3704, 28},
+ {3701, 27}, {3698, 25},
+ {3695, 24}, {3691, 22},
+ {3686, 21}, {3681, 19},
+ {3676, 18}, {3671, 17},
+ {3666, 15}, {3661, 14},
+ {3655, 12}, {3648, 11},
+ {3640, 9}, {3632, 8},
+ {3622, 6}, {3616, 5},
+ {3611, 4}, {3604, 2},
+ {3594, 1}, {2747, 0}
+ }
+};
+
+struct da9052_battery {
+ struct da9052 *da9052;
+ struct power_supply psy;
+ int charger_type;
+ int status;
+ int health;
+};
+
+static inline int volt_reg_to_mV(int value)
+ { return ((value*1000) / 512) + 2500; }
+static inline int ichg_reg_to_mA(int value)
+ { return ((value * 3900) / 1000); }
+
+static int da9052_average_calcuation(int *avg_value)
+{
+ int count, sum = 0;
+
+ if (avg_value == NULL)
+ return -EINVAL;
+
+ for (count = 0; count < DA9052_AVERAGE_SIZE; count++)
+ sum += *(avg_value + count);
+
+ return sum / DA9052_AVERAGE_SIZE;
+}
+
+static int da9052_battery_read_temperature(struct da9052_battery *battery,
+ int *bat_temp)
+{
+ int count, avg_value[DA9052_AVERAGE_SIZE];
+
+ for (count = 0; count < DA9052_AVERAGE_SIZE; count++)
+ avg_value[count] = da9052_adc_temperature_read(battery->da9052);
+ if (avg_value[count] < 0)
+ return avg_value[count];
+
+ *bat_temp = da9052_average_calcuation(avg_value);
+
+ return 0;
+}
+
+static int da9052_battery_read_current(struct da9052_battery *battery,
+ int *current_mA)
+{
+ int ret;
+
+ if (battery->status == POWER_SUPPLY_STATUS_DISCHARGING)
+ return -EBUSY;
+
+ ret = da9052_adc_manual_read(battery->da9052, DA9052_ADC_MAN_MUXSEL_ICH);
+ if (ret < 0)
+ return ret;
+
+ *current_mA = ichg_reg_to_mA(ret);
+
+ return 0;
+}
+
+static int da9052_battery_read_volt(struct da9052_battery *battery,
+ int *volt_mV)
+{
+ int ret, count, avg_value[DA9052_AVERAGE_SIZE], avg;
+
+ for (count = 0; count < DA9052_AVERAGE_SIZE; count++) {
+ ret = da9052_adc_manual_read(battery->da9052,
+ DA9052_ADC_MAN_MUXSEL_VBAT);
+ if (ret < 0)
+ return ret;
+ avg_value[count] = ret;
+ }
+
+ avg = da9052_average_calcuation(avg_value);
+ *volt_mV = volt_reg_to_mV(avg);
+
+ return 0;
+}
+
+static int da9052_battery_check_presence(struct da9052_battery *battery,
+ int *illegal)
+{
+ int ret, bat_temp;
+
+ ret = da9052_battery_read_temperature(battery, &bat_temp);
+ if (ret < 0)
+ return ret;
+
+ if (bat_temp > DA9052_BAT_THRESHOLD)
+ *illegal = 1;
+ else
+ *illegal = 0;
+
+ return 0;
+}
+
+static int interpolated(int vbat_lower, int vbat_upper, int level_lower,
+ int level_upper, int bat_voltage)
+{
+ int temp;
+
+ temp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
+ temp = level_lower + (((bat_voltage - vbat_lower) * temp) / 1000);
+
+ return temp;
+}
+
+unsigned char select_temperature(unsigned char temp_index, int bat_temperature)
+{
+ int temp_temperature;
+
+ temp_temperature = (temperature_lookup_ref[temp_index] +
+ temperature_lookup_ref[temp_index + 1]) / 2;
+
+ if (bat_temperature >= temp_temperature) {
+ temp_index += 1;
+ return temp_index;
+ } else
+ return temp_index;
+}
+
+static int da9052_battery_read_capacity(struct da9052_battery *battery,
+ int *capacity)
+{
+ int bat_temperature, bat_voltage;
+ int vbat_lower, vbat_upper, level_upper, level_lower;
+ int ret, flag, index, access_index = 0;
+
+ ret = da9052_battery_read_volt(battery, &bat_voltage);
+ if (ret < 0)
+ return ret;
+
+ ret = da9052_battery_read_temperature(battery, &bat_temperature);
+ if (ret < 0)
+ return ret;
+
+ for (index = 0; index < (DA9052_NO_OF_LOOKUP_TABLE - 1); index++) {
+ if (bat_temperature <= temperature_lookup_ref[0]) {
+ access_index = 0;
+ break;
+ } else if (bat_temperature >
+ temperature_lookup_ref[DA9052_NO_OF_LOOKUP_TABLE]){
+ access_index = DA9052_NO_OF_LOOKUP_TABLE - 1;
+ break;
+ } else if ((bat_temperature >= temperature_lookup_ref[index]) &&
+ (bat_temperature >= temperature_lookup_ref[index + 1])) {
+ access_index = select_temperature(index,
+ bat_temperature);
+ break;
+ }
+ }
+ if (bat_voltage >= vbat_vs_capacity_look_up[access_index][0][0]) {
+ *capacity = 100;
+ return 0;
+ }
+ if (bat_voltage <= vbat_vs_capacity_look_up[access_index]
+ [DA9052_LOOK_UP_TABLE_SIZE - 1][0]) {
+ *capacity = 0;
+ return 0;
+ }
+ flag = 0;
+
+ for (index = 0; index < (DA9052_LOOK_UP_TABLE_SIZE-1); index++) {
+ if ((bat_voltage <=
+ vbat_vs_capacity_look_up[access_index][index][0]) &&
+ (bat_voltage >=
+ vbat_vs_capacity_look_up[access_index][index + 1][0])) {
+ vbat_upper =
+ vbat_vs_capacity_look_up[access_index][index][0];
+ vbat_lower =
+ vbat_vs_capacity_look_up[access_index][index + 1][0];
+ level_upper =
+ vbat_vs_capacity_look_up[access_index][index][1];
+ level_lower =
+ vbat_vs_capacity_look_up[access_index][index + 1][1];
+ flag = 1;
+ break;
+ }
+ }
+ if (!flag)
+ return -EIO;
+
+ *capacity = interpolated(vbat_lower, vbat_upper, level_lower,
+ level_upper, bat_voltage);
+
+ return 0;
+}
+
+static int da9052_battery_check_health(struct da9052_battery *battery,
+ int *health)
+{
+ int ret, bat_illegal, capacity;
+
+ ret = da9052_battery_check_presence(battery, &bat_illegal);
+ if (ret < 0)
+ return ret;
+
+ if (bat_illegal) {
+ battery->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+ return 0;
+ }
+
+ if (battery->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
+ ret = da9052_battery_read_capacity(battery, &capacity);
+ if (ret < 0)
+ return ret;
+ if (capacity < DA9052_BAT_CAPACITY_LIMIT_LOW)
+ battery->health = POWER_SUPPLY_HEALTH_DEAD;
+ else
+ battery->health = POWER_SUPPLY_HEALTH_GOOD;
+ }
+
+ *health = battery->health;
+
+ return 0;
+}
+
+static irqreturn_t da9052_bat_irq(int irq, void *data)
+{
+ int status;
+ struct da9052_battery *battery = (struct da9052_battery *)data;
+
+ switch (irq) {
+ case DA9052_IRQ_TBAT:
+ battery->health = POWER_SUPPLY_HEALTH_OVERHEAT;
+ break;
+ case DA9052_IRQ_DCIN:
+ battery->charger_type = DA9052_WALL_CHARGER;
+ battery->status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case DA9052_IRQ_DCINREM:
+ status = da9052_reg_read(battery->da9052, DA9052_STATUS_A_REG);
+ if ((status & DA9052_STATUSA_VBUSDET) &&
+ (status & DA9052_STATUSA_VBUSSEL)) {
+ battery->charger_type = DA9052_USB_CHARGER;
+ battery->status = POWER_SUPPLY_STATUS_CHARGING;
+ } else {
+ battery->charger_type = DA9052_NOCHARGER;
+ battery->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+ break;
+ case DA9052_IRQ_VBUS:
+ status = da9052_reg_read(battery->da9052, DA9052_STATUS_A_REG);
+ if ((status & DA9052_STATUSA_DCINDET) &&
+ (status & DA9052_STATUSA_DCINSEL))
+ battery->charger_type = DA9052_WALL_CHARGER;
+ else
+ battery->charger_type = DA9052_USB_CHARGER;
+ battery->status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case DA9052_IRQ_VBUSREM:
+ battery->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ status = da9052_reg_read(battery->da9052, DA9052_STATUS_A_REG);
+ if ((status & DA9052_STATUSA_DCINDET) &&
+ (status & DA9052_STATUSA_DCINSEL)) {
+ battery->charger_type = DA9052_WALL_CHARGER;
+ battery->status = POWER_SUPPLY_STATUS_CHARGING;
+ } else {
+ battery->charger_type = DA9052_NOCHARGER;
+ battery->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+ break;
+ case DA9052_IRQ_CHGEND:
+ battery->status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ default:
+ dev_err(battery->da9052->dev, "DA9052 Unknown interrupt %d\n",
+ irq);
+ }
+ power_supply_changed(&battery->psy);
+ return IRQ_HANDLED;
+}
+
+static int da9052_bat_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret, illegal;
+ struct da9052_battery *battery =
+ container_of(psy, struct da9052_battery, psy);
+
+ ret = da9052_battery_check_presence(battery, &illegal);
+ if (ret < 0)
+ return ret;
+
+ if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
+ return -ENODEV;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = battery->status;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval =
+ (battery->charger_type == DA9052_NOCHARGER) ? 0 : 1;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ ret = da9052_battery_check_presence(battery, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = da9052_battery_check_health(battery, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ ret = da9052_battery_read_volt(battery, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ ret = da9052_battery_read_current(battery, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = da9052_battery_read_capacity(battery, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = da9052_adc_temperature_read(battery->da9052);
+ ret = val->intval;
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return ret;
+}
+
+static enum power_supply_property da9052_bat_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+};
+
+static struct power_supply template_battery = {
+ .name = "da9052-bat",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = da9052_bat_props,
+ .num_properties = ARRAY_SIZE(da9052_bat_props),
+ .get_property = da9052_bat_get_property,
+ .use_for_apm = 1,
+};
+
+static const char *da9052_bat_irqs[] = {
+ "BATT TEMP",
+ "DCIN DET",
+ "DCIN REM",
+ "VBUS DET",
+ "VBUS REM",
+ "CHG END",
+};
+
+static s32 __devinit da9052_bat_probe(struct platform_device *pdev)
+{
+ struct da9052_battery *battery;
+ int ret, irq, i;
+
+ battery = kzalloc(sizeof(*battery), GFP_KERNEL);
+ if (!battery)
+ return -ENOMEM;
+
+ battery->da9052 = dev_get_drvdata(pdev->dev.parent);
+
+ battery->psy = template_battery;
+ battery->charger_type = DA9052_NOCHARGER;
+ battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
+ battery->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+
+ for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
+ irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
+ ret = request_threaded_irq(battery->da9052->irq_base + irq,
+ NULL, da9052_bat_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ da9052_bat_irqs[i], battery);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request %s IRQ %d: %d\n",
+ da9052_bat_irqs[i], irq, ret);
+ goto err_bat_irq;
+ }
+ }
+
+ ret = power_supply_register(&pdev->dev, &battery->psy);
+ if (ret)
+ goto err_mem;
+
+ return 0;
+
+err_bat_irq:
+ for (; i >= 0; i--) {
+ irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
+ free_irq(irq, battery);
+ }
+err_mem:
+ kfree(battery);
+ return ret;
+}
+static int __devexit da9052_bat_remove(struct platform_device *pdev)
+{
+ int i, irq;
+ struct da9052_battery *battery = platform_get_drvdata(pdev);
+
+ for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
+ irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
+ free_irq(irq, battery);
+ }
+ power_supply_unregister(&battery->psy);
+
+ return 0;
+}
+
+static struct platform_driver da9052_bat_driver = {
+ .probe = da9052_bat_probe,
+ .remove = __devexit_p(da9052_bat_remove),
+ .driver = {
+ .name = "da9052-bat",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init da9052_bat_init(void)
+{
+ return platform_driver_register(&da9052_bat_driver);
+}
+module_init(da9052_bat_init);
+
+static void __exit da9052_bat_exit(void)
+{
+ platform_driver_unregister(&da9052_bat_driver);
+}
+module_exit(da9052_bat_exit);
+
+MODULE_DESCRIPTION("DA9052 BAT Device Driver");
+MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-bat");
--
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