[PATCH 34/57] power: ab8500_fg: add power cut feature for ab8505

From: mathieu . poirier
Date: Tue Sep 25 2012 - 12:13:49 EST

From: Rikard Olsson <rikard.p.olsson@xxxxxxxxxxxxxx>

Add support for a power cut feature which allows user to
configure when ab8505 should shut down system due to low
battery.

Signed-off-by: Rikard Olsson <rikard.p.olsson@xxxxxxxxxxxxxx>
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Reviewed-by: Martin SJOBLOM <martin.w.sjoblom@xxxxxxxxxxxxxx>
Reviewed-by: Jonas ABERG <jonas.aberg@xxxxxxxxxxxxxx>
---
drivers/power/ab8500_fg.c | 488 +++++++++++++++++++++++++++++++++-
include/linux/mfd/abx500.h | 10 +
include/linux/mfd/abx500/ab8500-bm.h | 8 +
3 files changed, 502 insertions(+), 4 deletions(-)

diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index 5e4a46b..fde189a 100644
--- a/drivers/power/ab8500_fg.c
+++ b/drivers/power/ab8500_fg.c
@@ -2351,6 +2351,64 @@ static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
dev_err(di->dev, "BattOk init write failed.\n");
goto out;
}
+
+ if ((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
+ abx500_get_chip_id(di->dev) >= AB8500_CUT2P0) {
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_MAX_TIME_REG,
+ di->bat->fg_params->pcut_max_time);
+
+ if (ret) {
+ dev_err(di->dev,
+ "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n",
+ __func__);
+ goto out;
+ };
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_FLAG_TIME_REG,
+ di->bat->fg_params->pcut_flag_time);
+
+ if (ret) {
+ dev_err(di->dev,
+ "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n",
+ __func__);
+ goto out;
+ };
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_RESTART_REG,
+ di->bat->fg_params->pcut_max_restart);
+
+ if (ret) {
+ dev_err(di->dev,
+ "%s write failed AB8505_RTC_PCUT_RESTART_REG\n",
+ __func__);
+ goto out;
+ };
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_DEBOUNCE_REG,
+ di->bat->fg_params->pcut_debunce_time);
+
+ if (ret) {
+ dev_err(di->dev,
+ "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n",
+ __func__);
+ goto out;
+ };
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_CTL_STATUS_REG,
+ di->bat->fg_params->pcut_enable);
+
+ if (ret) {
+ dev_err(di->dev,
+ "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n",
+ __func__);
+ goto out;
+ };
+ }
out:
return ret;
}
@@ -2572,22 +2630,433 @@ static ssize_t ab8500_show_capacity(struct device *dev,
return scnprintf(buf, PAGE_SIZE, "%d\n", capacity);
}

+static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_FLAG_TIME_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ long unsigned reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ if (kstrtoul(buf, 10, &reg_value) != 0)
+ goto fail;
+
+ if (reg_value > 0x7F) {
+ dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
+ goto fail;
+ }
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
+
+ if (ret < 0)
+ dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
+
+fail:
+ return count;
+}
+
+static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_MAX_TIME_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
+
+fail:
+ return ret;
+
+}
+
+static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ long unsigned int reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ if (kstrtoul(buf, 10, &reg_value) != 0)
+ goto fail;
+
+ if (reg_value > 0x7F) {
+ dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
+ goto fail;
+ }
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
+
+ if (ret < 0)
+ dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
+
+fail:
+ return count;
+}
+
+static ssize_t ab8505_powercut_restart_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_RESTART_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF));
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_restart_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long int reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ if (kstrtoul(buf, 10, &reg_value) != 0)
+ goto fail;
+
+ if (reg_value > 0xF) {
+ dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n");
+ goto fail;
+ }
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value);
+
+ if (ret < 0)
+ dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n");
+
+fail:
+ return count;
+
+}
+
+static ssize_t ab8505_powercut_timer_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_TIME_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_restart_counter_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_RESTART_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4);
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
+
+ if (ret < 0)
+ goto fail;
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1));
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long int reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ if (kstrtoul(buf, 10, &reg_value) != 0)
+ goto fail;
+
+ if (reg_value > 0x1) {
+ dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n");
+ goto fail;
+ }
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value);
+
+ if (ret < 0)
+ dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n");
+
+fail:
+ return count;
+}
+
+static ssize_t ab8505_powercut_flag_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4));
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_debounce_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_DEBOUNCE_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7));
+
+fail:
+ return ret;
+}
+
+static ssize_t ab8505_powercut_debounce_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long int reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ if (kstrtoul(buf, 10, &reg_value) != 0)
+ goto fail;
+
+ if (reg_value > 0x7) {
+ dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n");
+ goto fail;
+ }
+
+ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value);
+
+ if (ret < 0)
+ dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n");
+
+fail:
+ return count;
+}
+
+static ssize_t ab8505_powercut_enable_status_read(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 reg_value;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
+ AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
+
+ if (ret < 0) {
+ dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
+ goto fail;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5));
+
+fail:
+ return ret;
+}
+
static struct device_attribute ab8500_fg_sysfs_psy_attrs[] = {
__ATTR(capacity, S_IRUGO, ab8500_show_capacity, NULL),
};

+static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
+ __ATTR(powercut_flagtime, (S_IRUGO | S_IWUGO),
+ ab8505_powercut_flagtime_read,
+ ab8505_powercut_flagtime_write),
+ __ATTR(powercut_maxtime, (S_IRUGO | S_IWUGO),
+ ab8505_powercut_maxtime_read,
+ ab8505_powercut_maxtime_write),
+ __ATTR(powercut_restart_max, (S_IRUGO | S_IWUGO),
+ ab8505_powercut_restart_read,
+ ab8505_powercut_restart_write),
+ __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
+ __ATTR(powercut_restart_counter, S_IRUGO,
+ ab8505_powercut_restart_counter_read, NULL),
+ __ATTR(powercut_enable, (S_IRUGO | S_IWUGO), ab8505_powercut_read,
+ ab8505_powercut_write),
+ __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
+ __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUGO),
+ ab8505_powercut_debounce_read,
+ ab8505_powercut_debounce_write),
+ __ATTR(powercut_enable_status, S_IRUGO,
+ ab8505_powercut_enable_status_read, NULL),
+};
+
static int ab8500_fg_sysfs_psy_create_attrs(struct device *dev)
{
- unsigned int i;
+ unsigned int i, j;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);

for (i = 0; i < ARRAY_SIZE(ab8500_fg_sysfs_psy_attrs); i++)
if (device_create_file(dev, &ab8500_fg_sysfs_psy_attrs[i]))
- goto sysfs_psy_create_attrs_failed;
+ goto sysfs_psy_create_attrs_failed_ab8500;
+
+ if ((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
+ abx500_get_chip_id(dev->parent) >= AB8500_CUT2P0) {
+ for (j = 0; j < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); j++)
+ if (device_create_file(dev,
+ &ab8505_fg_sysfs_psy_attrs[j]))
+ goto sysfs_psy_create_attrs_failed_ab8505;
+ }

return 0;

-sysfs_psy_create_attrs_failed:
- dev_err(dev, "Failed creating sysfs psy attrs.\n");
+sysfs_psy_create_attrs_failed_ab8505:
+ dev_err(dev, "Failed creating sysfs psy attrs for ab8505.\n");
+ while (j--)
+ device_remove_file(dev, &ab8505_fg_sysfs_psy_attrs[i]);
+
+sysfs_psy_create_attrs_failed_ab8500:
+ dev_err(dev, "Failed creating sysfs psy attrs for ab8500.\n");
while (i--)
device_remove_file(dev, &ab8500_fg_sysfs_psy_attrs[i]);

@@ -2597,9 +3066,20 @@ sysfs_psy_create_attrs_failed:
static void ab8500_fg_sysfs_psy_remove_attrs(struct device *dev)
{
unsigned int i;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct ab8500_fg *di;
+
+ di = to_ab8500_fg_device_info(psy);

for (i = 0; i < ARRAY_SIZE(ab8500_fg_sysfs_psy_attrs); i++)
(void)device_remove_file(dev, &ab8500_fg_sysfs_psy_attrs[i]);
+
+ if ((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
+ abx500_get_chip_id(dev->parent) >= AB8500_CUT2P0) {
+ for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
+ (void)device_remove_file(dev,
+ &ab8505_fg_sysfs_psy_attrs[i]);
+ }
}
/* Exposure to the sysfs interface <<END>> */

diff --git a/include/linux/mfd/abx500.h b/include/linux/mfd/abx500.h
index eef1ddc..97e918f 100644
--- a/include/linux/mfd/abx500.h
+++ b/include/linux/mfd/abx500.h
@@ -204,6 +204,11 @@ struct abx500_fg;
* points.
* @maint_thres This is the threshold where we stop reporting
* battery full while in maintenance, in per cent
+ * @pcut_enable: Enable power cut feature in ab8505
+ * @pcut_max_time: Max time threshold
+ * @pcut_flag_time: Flagtime threshold
+ * @pcut_max_restart: Max number of restarts
+ * @pcut_debunce_time: Sets battery debounce time
*/
struct abx500_fg_parameters {
int recovery_sleep_timer;
@@ -221,6 +226,11 @@ struct abx500_fg_parameters {
int battok_raising_th_sel1;
int user_cap_limit;
int maint_thres;
+ bool pcut_enable;
+ u8 pcut_max_time;
+ u8 pcut_flag_time;
+ u8 pcut_max_restart;
+ u8 pcut_debunce_time;
};

/**
diff --git a/include/linux/mfd/abx500/ab8500-bm.h b/include/linux/mfd/abx500/ab8500-bm.h
index 175197c..cd15ea3 100644
--- a/include/linux/mfd/abx500/ab8500-bm.h
+++ b/include/linux/mfd/abx500/ab8500-bm.h
@@ -235,6 +235,14 @@
/* Battery type */
#define BATTERY_UNKNOWN 00

+/* Registers for pcut feature in ab8505 and ab9540 */
+#define AB8505_RTC_PCUT_CTL_STATUS_REG 0x12
+#define AB8505_RTC_PCUT_TIME_REG 0x13
+#define AB8505_RTC_PCUT_MAX_TIME_REG 0x14
+#define AB8505_RTC_PCUT_FLAG_TIME_REG 0x15
+#define AB8505_RTC_PCUT_RESTART_REG 0x16
+#define AB8505_RTC_PCUT_DEBOUNCE_REG 0x17
+
/**
* struct res_to_temp - defines one point in a temp to res curve. To
* be used in battery packs that combines the identification resistor with a
--
1.7.5.4

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