[PATCH v7 3/6] power: Add support for DA9150 Fuel-Gauge

Adam Thomson
2015-10-07T13:54:29Z

This adds power supply driver support for the Fuel-Gauge part of
the DA9150 combined Charger and Fuel-Gauge device.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
---

Changes in v7:
- Fix return code handling for platform_get_irq_byname() call.

Changes in v6:
- Rebase to v4.3-rc4

Changes in v5:
- Rebase to v4.2

Changes in v4:
- Update compatible string of fuel-gauge to "dlg,da9150-fuel-gauge".
Also updated driver name string to keep consistency.
- Update Kconfig and Makefile to use BATTERY_* for config entry instead of
FG_*. Also fuel-gauge module now depends on MFD not Charger.
- Added helper function to simplify single attribute accesses using QIF
interface of fuel-gauge.
- Use of devm_* functions for IRQ and power_supply registration.
- Added checking of result from platform_get_irq_byname().

Changes in v3:
- Removed use of temp callback function, at request of Lee Jones.
- Comment added to clarify limitation of temperature reading functionality
that remains.

Changes in v2:
- Moved temp callback function prototype to be part of power fuel-gauge patch,
rather than MFD, as requested by Lee Jones.

drivers/power/Kconfig | 10 +
drivers/power/Makefile | 1 +
drivers/power/da9150-fg.c | 579 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 590 insertions(+)
create mode 100644 drivers/power/da9150-fg.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index f8758d6..8d53f58 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -204,6 +204,16 @@ config CHARGER_DA9150
This driver can also be built as a module. If so, the module will be
called da9150-charger.

+config BATTERY_DA9150
+ tristate "Dialog Semiconductor DA9150 Fuel Gauge support"
+ depends on MFD_DA9150
+ help
+ Say Y here to enable support for the Fuel-Gauge unit of the DA9150
+ Integrated Charger & Fuel-Gauge IC
+
+ This driver can also be built as a module. If so, the module will be
+ called da9150-fg.
+
config AXP288_CHARGER
tristate "X-Powers AXP288 Charger"
depends on MFD_AXP20X && EXTCON_AXP288
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 5752ce8..cbdf89d 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
obj-$(CONFIG_BATTERY_DA9052) += da9052-battery.o
obj-$(CONFIG_CHARGER_DA9150) += da9150-charger.o
+obj-$(CONFIG_BATTERY_DA9150) += da9150-fg.o
obj-$(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/da9150-fg.c b/drivers/power/da9150-fg.c
new file mode 100644
index 0000000..8b8ce97
--- /dev/null
+++ b/drivers/power/da9150-fg.c
@@ -0,0 +1,579 @@
+/*
+ * DA9150 Fuel-Gauge Driver
+ *
+ * Copyright (c) 2015 Dialog Semiconductor
+ *
+ * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.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/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/power_supply.h>
+#include <linux/list.h>
+#include <asm/div64.h>
+#include <linux/mfd/da9150/core.h>
+#include <linux/mfd/da9150/registers.h>
+
+/* Core2Wire */
+#define DA9150_QIF_READ (0x0 << 7)
+#define DA9150_QIF_WRITE (0x1 << 7)
+#define DA9150_QIF_CODE_MASK 0x7F
+
+#define DA9150_QIF_BYTE_SIZE 8
+#define DA9150_QIF_BYTE_MASK 0xFF
+#define DA9150_QIF_SHORT_SIZE 2
+#define DA9150_QIF_LONG_SIZE 4
+
+/* QIF Codes */
+#define DA9150_QIF_UAVG 6
+#define DA9150_QIF_UAVG_SIZE DA9150_QIF_LONG_SIZE
+#define DA9150_QIF_IAVG 8
+#define DA9150_QIF_IAVG_SIZE DA9150_QIF_LONG_SIZE
+#define DA9150_QIF_NTCAVG 12
+#define DA9150_QIF_NTCAVG_SIZE DA9150_QIF_LONG_SIZE
+#define DA9150_QIF_SHUNT_VAL 36
+#define DA9150_QIF_SHUNT_VAL_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_SD_GAIN 38
+#define DA9150_QIF_SD_GAIN_SIZE DA9150_QIF_LONG_SIZE
+#define DA9150_QIF_FCC_MAH 40
+#define DA9150_QIF_FCC_MAH_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_SOC_PCT 43
+#define DA9150_QIF_SOC_PCT_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_CHARGE_LIMIT 44
+#define DA9150_QIF_CHARGE_LIMIT_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_DISCHARGE_LIMIT 45
+#define DA9150_QIF_DISCHARGE_LIMIT_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_FW_MAIN_VER 118
+#define DA9150_QIF_FW_MAIN_VER_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_E_FG_STATUS 126
+#define DA9150_QIF_E_FG_STATUS_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_SYNC 127
+#define DA9150_QIF_SYNC_SIZE DA9150_QIF_SHORT_SIZE
+#define DA9150_QIF_MAX_CODES 128
+
+/* QIF Sync Timeout */
+#define DA9150_QIF_SYNC_TIMEOUT 1000
+#define DA9150_QIF_SYNC_RETRIES 10
+
+/* QIF E_FG_STATUS */
+#define DA9150_FG_IRQ_LOW_SOC_MASK (1 << 0)
+#define DA9150_FG_IRQ_HIGH_SOC_MASK (1 << 1)
+#define DA9150_FG_IRQ_SOC_MASK \
+ (DA9150_FG_IRQ_LOW_SOC_MASK | DA9150_FG_IRQ_HIGH_SOC_MASK)
+
+/* Private data */
+struct da9150_fg {
+ struct da9150 *da9150;
+ struct device *dev;
+
+ struct mutex io_lock;
+
+ struct power_supply *battery;
+ struct delayed_work work;
+ u32 interval;
+
+ int warn_soc;
+ int crit_soc;
+ int soc;
+};
+
+/* Battery Properties */
+static u32 da9150_fg_read_attr(struct da9150_fg *fg, u8 code, u8 size)
+
+{
+ u8 buf[size];
+ u8 read_addr;
+ u32 res = 0;
+ int i;
+
+ /* Set QIF code (READ mode) */
+ read_addr = (code & DA9150_QIF_CODE_MASK) | DA9150_QIF_READ;
+
+ da9150_read_qif(fg->da9150, read_addr, size, buf);
+ for (i = 0; i < size; ++i)
+ res |= (buf[i] << (i * DA9150_QIF_BYTE_SIZE));
+
+ return res;
+}
+
+static void da9150_fg_write_attr(struct da9150_fg *fg, u8 code, u8 size,
+ u32 val)
+
+{
+ u8 buf[size];
+ u8 write_addr;
+ int i;
+
+ /* Set QIF code (WRITE mode) */
+ write_addr = (code & DA9150_QIF_CODE_MASK) | DA9150_QIF_WRITE;
+
+ for (i = 0; i < size; ++i) {
+ buf[i] = (val >> (i * DA9150_QIF_BYTE_SIZE)) &
+ DA9150_QIF_BYTE_MASK;
+ }
+ da9150_write_qif(fg->da9150, write_addr, size, buf);
+}
+
+/* Trigger QIF Sync to update QIF readable data */
+static void da9150_fg_read_sync_start(struct da9150_fg *fg)
+{
+ int i = 0;
+ u32 res = 0;
+
+ mutex_lock(&fg->io_lock);
+
+ /* Check if QIF sync already requested, and write to sync if not */
+ res = da9150_fg_read_attr(fg, DA9150_QIF_SYNC,
+ DA9150_QIF_SYNC_SIZE);
+ if (res > 0)
+ da9150_fg_write_attr(fg, DA9150_QIF_SYNC,
+ DA9150_QIF_SYNC_SIZE, 0);
+
+ /* Wait for sync to complete */
+ res = 0;
+ while ((res == 0) && (i++ < DA9150_QIF_SYNC_RETRIES)) {
+ usleep_range(DA9150_QIF_SYNC_TIMEOUT,
+ DA9150_QIF_SYNC_TIMEOUT * 2);
+ res = da9150_fg_read_attr(fg, DA9150_QIF_SYNC,
+ DA9150_QIF_SYNC_SIZE);
+ }
+
+ /* Check if sync completed */
+ if (res == 0)
+ dev_err(fg->dev, "Failed to perform QIF read sync!\n");
+}
+
+/*
+ * Should always be called after QIF sync read has been performed, and all
+ * attributes required have been accessed.
+ */
+static inline void da9150_fg_read_sync_end(struct da9150_fg *fg)
+{
+ mutex_unlock(&fg->io_lock);
+}
+
+/* Sync read of single QIF attribute */
+static u32 da9150_fg_read_attr_sync(struct da9150_fg *fg, u8 code, u8 size)
+{
+ u32 val;
+
+ da9150_fg_read_sync_start(fg);
+ val = da9150_fg_read_attr(fg, code, size);
+ da9150_fg_read_sync_end(fg);
+
+ return val;
+}
+
+/* Wait for QIF Sync, write QIF data and wait for ack */
+static void da9150_fg_write_attr_sync(struct da9150_fg *fg, u8 code, u8 size,
+ u32 val)
+{
+ int i = 0;
+ u32 res = 0, sync_val;
+
+ mutex_lock(&fg->io_lock);
+
+ /* Check if QIF sync already requested */
+ res = da9150_fg_read_attr(fg, DA9150_QIF_SYNC,
+ DA9150_QIF_SYNC_SIZE);
+
+ /* Wait for an existing sync to complete */
+ while ((res == 0) && (i++ < DA9150_QIF_SYNC_RETRIES)) {
+ usleep_range(DA9150_QIF_SYNC_TIMEOUT,
+ DA9150_QIF_SYNC_TIMEOUT * 2);
+ res = da9150_fg_read_attr(fg, DA9150_QIF_SYNC,
+ DA9150_QIF_SYNC_SIZE);
+ }
+
+ if (res == 0) {
+ dev_err(fg->dev, "Timeout waiting for existing QIF sync!\n");
+ mutex_unlock(&fg->io_lock);
+ return;
+ }
+
+ /* Write value for QIF code */
+ da9150_fg_write_attr(fg, code, size, val);
+
+ /* Wait for write acknowledgment */
+ i = 0;
+ sync_val = res;
+ while ((res == sync_val) && (i++ < DA9150_QIF_SYNC_RETRIES)) {
+ usleep_range(DA9150_QIF_SYNC_TIMEOUT,
+ DA9150_QIF_SYNC_TIMEOUT * 2);
+ res = da9150_fg_read_attr(fg, DA9150_QIF_SYNC,
+ DA9150_QIF_SYNC_SIZE);
+ }
+
+ mutex_unlock(&fg->io_lock);
+
+ /* Check write was actually successful */
+ if (res != (sync_val + 1))
+ dev_err(fg->dev, "Error performing QIF sync write for code %d\n",
+ code);
+}
+
+/* Power Supply attributes */
+static int da9150_fg_capacity(struct da9150_fg *fg,
+ union power_supply_propval *val)
+{
+ val->intval = da9150_fg_read_attr_sync(fg, DA9150_QIF_SOC_PCT,
+ DA9150_QIF_SOC_PCT_SIZE);
+
+ if (val->intval > 100)
+ val->intval = 100;
+
+ return 0;
+}
+
+static int da9150_fg_current_avg(struct da9150_fg *fg,
+ union power_supply_propval *val)
+{
+ u32 iavg, sd_gain, shunt_val;
+ u64 div, res;
+
+ da9150_fg_read_sync_start(fg);
+ iavg = da9150_fg_read_attr(fg, DA9150_QIF_IAVG,
+ DA9150_QIF_IAVG_SIZE);
+ shunt_val = da9150_fg_read_attr(fg, DA9150_QIF_SHUNT_VAL,
+ DA9150_QIF_SHUNT_VAL_SIZE);
+ sd_gain = da9150_fg_read_attr(fg, DA9150_QIF_SD_GAIN,
+ DA9150_QIF_SD_GAIN_SIZE);
+ da9150_fg_read_sync_end(fg);
+
+ div = (u64) (sd_gain * shunt_val * 65536ULL);
+ do_div(div, 1000000);
+ res = (u64) (iavg * 1000000ULL);
+ do_div(res, div);
+
+ val->intval = (int) res;
+
+ return 0;
+}
+
+static int da9150_fg_voltage_avg(struct da9150_fg *fg,
+ union power_supply_propval *val)
+{
+ u64 res;
+
+ val->intval = da9150_fg_read_attr_sync(fg, DA9150_QIF_UAVG,
+ DA9150_QIF_UAVG_SIZE);
+
+ res = (u64) (val->intval * 186ULL);
+ do_div(res, 10000);
+ val->intval = (int) res;
+
+ return 0;
+}
+
+static int da9150_fg_charge_full(struct da9150_fg *fg,
+ union power_supply_propval *val)
+{
+ val->intval = da9150_fg_read_attr_sync(fg, DA9150_QIF_FCC_MAH,
+ DA9150_QIF_FCC_MAH_SIZE);
+
+ val->intval = val->intval * 1000;
+
+ return 0;
+}
+
+/*
+ * Temperature reading from device is only valid if battery/system provides
+ * valid NTC to associated pin of DA9150 chip.
+ */
+static int da9150_fg_temp(struct da9150_fg *fg,
+ union power_supply_propval *val)
+{
+ val->intval = da9150_fg_read_attr_sync(fg, DA9150_QIF_NTCAVG,
+ DA9150_QIF_NTCAVG_SIZE);
+
+ val->intval = (val->intval * 10) / 1048576;
+
+ return 0;
+}
+
+static enum power_supply_property da9150_fg_props[] = {
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+static int da9150_fg_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct da9150_fg *fg = dev_get_drvdata(psy->dev.parent);
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = da9150_fg_capacity(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ ret = da9150_fg_current_avg(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ ret = da9150_fg_voltage_avg(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = da9150_fg_charge_full(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = da9150_fg_temp(fg, val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+/* Repeated SOC check */
+static bool da9150_fg_soc_changed(struct da9150_fg *fg)
+{
+ union power_supply_propval val;
+
+ da9150_fg_capacity(fg, &val);
+ if (val.intval != fg->soc) {
+ fg->soc = val.intval;
+ return true;
+ }
+
+ return false;
+}
+
+static void da9150_fg_work(struct work_struct *work)
+{
+ struct da9150_fg *fg = container_of(work, struct da9150_fg, work.work);
+
+ /* Report if SOC has changed */
+ if (da9150_fg_soc_changed(fg))
+ power_supply_changed(fg->battery);
+
+ schedule_delayed_work(&fg->work, msecs_to_jiffies(fg->interval));
+}
+
+/* SOC level event configuration */
+static void da9150_fg_soc_event_config(struct da9150_fg *fg)
+{
+ int soc;
+
+ soc = da9150_fg_read_attr_sync(fg, DA9150_QIF_SOC_PCT,
+ DA9150_QIF_SOC_PCT_SIZE);
+
+ if (soc > fg->warn_soc) {
+ /* If SOC > warn level, set discharge warn level event */
+ da9150_fg_write_attr_sync(fg, DA9150_QIF_DISCHARGE_LIMIT,
+ DA9150_QIF_DISCHARGE_LIMIT_SIZE,
+ fg->warn_soc + 1);
+ } else if ((soc <= fg->warn_soc) && (soc > fg->crit_soc)) {
+ /*
+ * If SOC <= warn level, set discharge crit level event,
+ * and set charge warn level event.
+ */
+ da9150_fg_write_attr_sync(fg, DA9150_QIF_DISCHARGE_LIMIT,
+ DA9150_QIF_DISCHARGE_LIMIT_SIZE,
+ fg->crit_soc + 1);
+
+ da9150_fg_write_attr_sync(fg, DA9150_QIF_CHARGE_LIMIT,
+ DA9150_QIF_CHARGE_LIMIT_SIZE,
+ fg->warn_soc);
+ } else if (soc <= fg->crit_soc) {
+ /* If SOC <= crit level, set charge crit level event */
+ da9150_fg_write_attr_sync(fg, DA9150_QIF_CHARGE_LIMIT,
+ DA9150_QIF_CHARGE_LIMIT_SIZE,
+ fg->crit_soc);
+ }
+}
+
+static irqreturn_t da9150_fg_irq(int irq, void *data)
+{
+ struct da9150_fg *fg = data;
+ u32 e_fg_status;
+
+ /* Read FG IRQ status info */
+ e_fg_status = da9150_fg_read_attr(fg, DA9150_QIF_E_FG_STATUS,
+ DA9150_QIF_E_FG_STATUS_SIZE);
+
+ /* Handle warning/critical threhold events */
+ if (e_fg_status & DA9150_FG_IRQ_SOC_MASK)
+ da9150_fg_soc_event_config(fg);
+
+ /* Clear any FG IRQs */
+ da9150_fg_write_attr(fg, DA9150_QIF_E_FG_STATUS,
+ DA9150_QIF_E_FG_STATUS_SIZE, e_fg_status);
+
+ return IRQ_HANDLED;
+}
+
+static struct da9150_fg_pdata *da9150_fg_dt_pdata(struct device *dev)
+{
+ struct device_node *fg_node = dev->of_node;
+ struct da9150_fg_pdata *pdata;
+
+ pdata = devm_kzalloc(dev, sizeof(struct da9150_fg_pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ of_property_read_u32(fg_node, "dlg,update-interval",
+ &pdata->update_interval);
+ of_property_read_u8(fg_node, "dlg,warn-soc-level",
+ &pdata->warn_soc_lvl);
+ of_property_read_u8(fg_node, "dlg,crit-soc-level",
+ &pdata->crit_soc_lvl);
+
+ return pdata;
+}
+
+static const struct power_supply_desc fg_desc = {
+ .name = "da9150-fg",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = da9150_fg_props,
+ .num_properties = ARRAY_SIZE(da9150_fg_props),
+ .get_property = da9150_fg_get_prop,
+};
+
+static int da9150_fg_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct da9150 *da9150 = dev_get_drvdata(dev->parent);
+ struct da9150_fg_pdata *fg_pdata = dev_get_platdata(dev);
+ struct da9150_fg *fg;
+ int ver, irq, ret = 0;
+
+ fg = devm_kzalloc(dev, sizeof(*fg), GFP_KERNEL);
+ if (fg == NULL)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, fg);
+ fg->da9150 = da9150;
+ fg->dev = dev;
+
+ mutex_init(&fg->io_lock);
+
+ /* Enable QIF */
+ da9150_set_bits(da9150, DA9150_CORE2WIRE_CTRL_A, DA9150_FG_QIF_EN_MASK,
+ DA9150_FG_QIF_EN_MASK);
+
+ fg->battery = devm_power_supply_register(dev, &fg_desc, NULL);
+ if (IS_ERR(fg->battery)) {
+ ret = PTR_ERR(fg->battery);
+ return ret;
+ }
+
+ ver = da9150_fg_read_attr(fg, DA9150_QIF_FW_MAIN_VER,
+ DA9150_QIF_FW_MAIN_VER_SIZE);
+ dev_info(dev, "Version: 0x%x\n", ver);
+
+ /* Handle DT data if provided */
+ if (dev->of_node) {
+ fg_pdata = da9150_fg_dt_pdata(dev);
+ dev->platform_data = fg_pdata;
+ }
+
+ /* Handle any pdata provided */
+ if (fg_pdata) {
+ fg->interval = fg_pdata->update_interval;
+
+ if (fg_pdata->warn_soc_lvl > 100)
+ dev_warn(dev, "Invalid SOC warning level provided, Ignoring");
+ else
+ fg->warn_soc = fg_pdata->warn_soc_lvl;
+
+ if ((fg_pdata->crit_soc_lvl > 100) ||
+ (fg_pdata->crit_soc_lvl >= fg_pdata->warn_soc_lvl))
+ dev_warn(dev, "Invalid SOC critical level provided, Ignoring");
+ else
+ fg->crit_soc = fg_pdata->crit_soc_lvl;
+
+
+ }
+
+ /* Configure initial SOC level events */
+ da9150_fg_soc_event_config(fg);
+
+ /*
+ * If an interval period has been provided then setup repeating
+ * work for reporting data updates.
+ */
+ if (fg->interval) {
+ INIT_DELAYED_WORK(&fg->work, da9150_fg_work);
+ schedule_delayed_work(&fg->work,
+ msecs_to_jiffies(fg->interval));
+ }
+
+ /* Register IRQ */
+ irq = platform_get_irq_byname(pdev, "FG");
+ if (irq < 0) {
+ dev_err(dev, "Failed to get IRQ FG: %d\n", irq);
+ ret = irq;
+ goto irq_fail;
+ }
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, da9150_fg_irq,
+ IRQF_ONESHOT, "FG", fg);
+ if (ret) {
+ dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret);
+ goto irq_fail;
+ }
+
+ return 0;
+
+irq_fail:
+ if (fg->interval)
+ cancel_delayed_work(&fg->work);
+
+ return ret;
+}
+
+static int da9150_fg_remove(struct platform_device *pdev)
+{
+ struct da9150_fg *fg = platform_get_drvdata(pdev);
+
+ if (fg->interval)
+ cancel_delayed_work(&fg->work);
+
+ return 0;
+}
+
+static int da9150_fg_resume(struct platform_device *pdev)
+{
+ struct da9150_fg *fg = platform_get_drvdata(pdev);
+
+ /*
+ * Trigger SOC check to happen now so as to indicate any value change
+ * since last check before suspend.
+ */
+ if (fg->interval)
+ flush_delayed_work(&fg->work);
+
+ return 0;
+}
+
+static struct platform_driver da9150_fg_driver = {
+ .driver = {
+ .name = "da9150-fuel-gauge",
+ },
+ .probe = da9150_fg_probe,
+ .remove = da9150_fg_remove,
+ .resume = da9150_fg_resume,
+};
+
+module_platform_driver(da9150_fg_driver);
+
+MODULE_DESCRIPTION("Fuel-Gauge Driver for DA9150");
+MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
+MODULE_LICENSE("GPL");
--
1.9.3