power: bq24257: Add various device-specific sysfs properties

This patch adds support for enabling/disabling optional device specific
features through sysfs properties at runtime.

* High-impedance mode enable/disable
* Sysoff enable/disable

Refer to the respective device datasheets for more information:

http://www.ti.com/product/bq24250
http://www.ti.com/product/bq24251
http://www.ti.com/product/bq24257

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c
index db719bf96452..1fea2c7ef97f 100644
--- a/drivers/power/bq24257_charger.c
+++ b/drivers/power/bq24257_charger.c
@@ -791,12 +791,65 @@ static ssize_t bq24257_show_in_dpm_voltage(struct device *dev,
                          bq24257_vindpm_map[bq->init_data.vindpm]);
 }
 
+static ssize_t bq24257_sysfs_show_enable(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf)
+{
+        struct power_supply *psy = dev_get_drvdata(dev);
+        struct bq24257_device *bq = power_supply_get_drvdata(psy);
+        int ret;
+
+        if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
+                ret = bq24257_field_read(bq, F_HZ_MODE);
+        else if (strcmp(attr->attr.name, "sysoff_enable") == 0)
+                ret = bq24257_field_read(bq, F_SYSOFF);
+        else
+                return -EINVAL;
+
+        if (ret < 0)
+                return ret;
+
+        return scnprintf(buf, PAGE_SIZE, "%d\n", ret);
+}
+
+static ssize_t bq24257_sysfs_set_enable(struct device *dev,
+                                        struct device_attribute *attr,
+                                        const char *buf,
+                                        size_t count)
+{
+        struct power_supply *psy = dev_get_drvdata(dev);
+        struct bq24257_device *bq = power_supply_get_drvdata(psy);
+        long val;
+        int ret;
+
+        if (kstrtol(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
+                ret = bq24257_field_write(bq, F_HZ_MODE, (bool)val);
+        else if (strcmp(attr->attr.name, "sysoff_enable") == 0)
+                ret = bq24257_field_write(bq, F_SYSOFF, (bool)val);
+        else
+                return -EINVAL;
+
+        if (ret < 0)
+                return ret;
+
+        return count;
+}
+
 static DEVICE_ATTR(ovp_voltage, S_IRUGO, bq24257_show_ovp_voltage, NULL);
 static DEVICE_ATTR(in_dpm_voltage, S_IRUGO, bq24257_show_in_dpm_voltage, NULL);
+static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
+                   bq24257_sysfs_show_enable, bq24257_sysfs_set_enable);
+static DEVICE_ATTR(sysoff_enable, S_IWUSR | S_IRUGO,
+                   bq24257_sysfs_show_enable, bq24257_sysfs_set_enable);
 
 static struct attribute *bq24257_charger_attr[] = {
         &dev_attr_ovp_voltage.attr,
         &dev_attr_in_dpm_voltage.attr,
+        &dev_attr_high_impedance_enable.attr,
+        &dev_attr_sysoff_enable.attr,
         NULL,
 };