Merge branch 'power-supply-scope' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-drm-fsl-dcu.git] / drivers / power / ds2780_battery.c

diff --git a/drivers/power/ds2780_battery.c b/drivers/power/ds2780_battery.c
index 1fefe82e12e3b94f59add3abb7af9db44047f1a8..887ec98d8c22063ff85754e6d749ac16f6460652 100644 (file)
--- a/drivers/power/ds2780_battery.c
+++ b/drivers/power/ds2780_battery.c
@@ -39,6 +39,7 @@ struct ds2780_device_info {
        struct device *dev;
        struct power_supply bat;
        struct device *w1_dev;
+       struct task_struct *mutex_holder;
 };
 
 enum current_types {
@@ -49,8 +50,8 @@ enum current_types {
 static const char model[] = "DS2780";
 static const char manufacturer[] = "Maxim/Dallas";
 
-static inline struct ds2780_device_info *to_ds2780_device_info(
-       struct power_supply *psy)
+static inline struct ds2780_device_info *
+to_ds2780_device_info(struct power_supply *psy)
 {
        return container_of(psy, struct ds2780_device_info, bat);
 }
@@ -60,17 +61,28 @@ static inline struct power_supply *to_power_supply(struct device *dev)
        return dev_get_drvdata(dev);
 }
 
-static inline int ds2780_read8(struct device *dev, u8 *val, int addr)
+static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
+       char *buf, int addr, size_t count, int io)
 {
-       return w1_ds2780_io(dev, val, addr, sizeof(u8), 0);
+       if (dev_info->mutex_holder == current)
+               return w1_ds2780_io_nolock(dev_info->w1_dev, buf, addr, count, io);
+       else
+               return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
+}
+
+static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
+       int addr)
+{
+       return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
 }
 
-static int ds2780_read16(struct device *dev, s16 *val, int addr)
+static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
+       int addr)
 {
        int ret;
        u8 raw[2];
 
-       ret = w1_ds2780_io(dev, raw, addr, sizeof(u8) * 2, 0);
+       ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
        if (ret < 0)
                return ret;
 
@@ -79,16 +91,16 @@ static int ds2780_read16(struct device *dev, s16 *val, int addr)
        return 0;
 }
 
-static inline int ds2780_read_block(struct device *dev, u8 *val, int addr,
-       size_t count)
+static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
+       u8 *val, int addr, size_t count)
 {
-       return w1_ds2780_io(dev, val, addr, count, 0);
+       return ds2780_battery_io(dev_info, val, addr, count, 0);
 }
 
-static inline int ds2780_write(struct device *dev, u8 *val, int addr,
-       size_t count)
+static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
+       int addr, size_t count)
 {
-       return w1_ds2780_io(dev, val, addr, count, 1);
+       return ds2780_battery_io(dev_info, val, addr, count, 1);
 }
 
 static inline int ds2780_store_eeprom(struct device *dev, int addr)
@@ -122,7 +134,7 @@ static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 {
        int ret;
 
-       ret = ds2780_write(dev_info->w1_dev, &conductance,
+       ret = ds2780_write(dev_info, &conductance,
                                DS2780_RSNSP_REG, sizeof(u8));
        if (ret < 0)
                return ret;
@@ -134,7 +146,7 @@ static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
        u16 *rsgain)
 {
-       return ds2780_read16(dev_info->w1_dev, rsgain, DS2780_RSGAIN_MSB_REG);
+       return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
 }
 
 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
@@ -144,8 +156,8 @@ static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
        int ret;
        u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 
-       ret = ds2780_write(dev_info->w1_dev, raw,
-                               DS2780_RSGAIN_MSB_REG, sizeof(u8) * 2);
+       ret = ds2780_write(dev_info, raw,
+                               DS2780_RSGAIN_MSB_REG, sizeof(raw));
        if (ret < 0)
                return ret;
 
@@ -167,7 +179,7 @@ static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
         * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
         * voltage LSB register
         */
-       ret = ds2780_read16(dev_info->w1_dev, &voltage_raw,
+       ret = ds2780_read16(dev_info, &voltage_raw,
                                DS2780_VOLT_MSB_REG);
        if (ret < 0)
                return ret;
@@ -196,7 +208,7 @@ static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
         * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
         * temperature LSB register
         */
-       ret = ds2780_read16(dev_info->w1_dev, &temperature_raw,
+       ret = ds2780_read16(dev_info, &temperature_raw,
                                DS2780_TEMP_MSB_REG);
        if (ret < 0)
                return ret;
@@ -222,13 +234,13 @@ static int ds2780_get_current(struct ds2780_device_info *dev_info,
         * The units of measurement for current are dependent on the value of
         * the sense resistor.
         */
-       ret = ds2780_read8(dev_info->w1_dev, &sense_res_raw, DS2780_RSNSP_REG);
+       ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
        if (ret < 0)
                return ret;
 
        if (sense_res_raw == 0) {
                dev_err(dev_info->dev, "sense resistor value is 0\n");
-               return -ENXIO;
+               return -EINVAL;
        }
        sense_res = 1000 / sense_res_raw;
 
@@ -248,7 +260,7 @@ static int ds2780_get_current(struct ds2780_device_info *dev_info,
         * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
         * LSB register
         */
-       ret = ds2780_read16(dev_info->w1_dev, &current_raw, reg_msb);
+       ret = ds2780_read16(dev_info, &current_raw, reg_msb);
        if (ret < 0)
                return ret;
 
@@ -267,7 +279,7 @@ static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
         * The units of measurement for accumulated current are dependent on
         * the value of the sense resistor.
         */
-       ret = ds2780_read8(dev_info->w1_dev, &sense_res_raw, DS2780_RSNSP_REG);
+       ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
        if (ret < 0)
                return ret;
 
@@ -285,7 +297,7 @@ static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
         * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
         * LSB register
         */
-       ret = ds2780_read16(dev_info->w1_dev, &current_raw, DS2780_ACR_MSB_REG);
+       ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
        if (ret < 0)
                return ret;
 
@@ -299,7 +311,7 @@ static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
        int ret;
        u8 raw;
 
-       ret = ds2780_read8(dev_info->w1_dev, &raw, DS2780_RARC_REG);
+       ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
        if (ret < 0)
                return ret;
 
@@ -345,7 +357,7 @@ static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
         * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
         * LSB register
         */
-       ret = ds2780_read16(dev_info->w1_dev, &charge_raw, DS2780_RAAC_MSB_REG);
+       ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
        if (ret < 0)
                return ret;
 
@@ -356,7 +368,7 @@ static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
 static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
        u8 *control_reg)
 {
-       return ds2780_read8(dev_info->w1_dev, control_reg, DS2780_CONTROL_REG);
+       return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
 }
 
 static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
@@ -364,7 +376,7 @@ static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
 {
        int ret;
 
-       ret = ds2780_write(dev_info->w1_dev, &control_reg,
+       ret = ds2780_write(dev_info, &control_reg,
                                DS2780_CONTROL_REG, sizeof(u8));
        if (ret < 0)
                return ret;
@@ -503,7 +515,7 @@ static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
        struct power_supply *psy = to_power_supply(dev);
        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 
-       ret = ds2780_read8(dev_info->w1_dev, &sense_resistor, DS2780_RSNSP_REG);
+       ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
        if (ret < 0)
                return ret;
 
@@ -584,7 +596,7 @@ static ssize_t ds2780_get_pio_pin(struct device *dev,
        struct power_supply *psy = to_power_supply(dev);
        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 
-       ret = ds2780_read8(dev_info->w1_dev, &sfr, DS2780_SFR_REG);
+       ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
        if (ret < 0)
                return ret;
 
@@ -611,7 +623,7 @@ static ssize_t ds2780_set_pio_pin(struct device *dev,
                return -EINVAL;
        }
 
-       ret = ds2780_write(dev_info->w1_dev, &new_setting,
+       ret = ds2780_write(dev_info, &new_setting,
                                DS2780_SFR_REG, sizeof(u8));
        if (ret < 0)
                return ret;
@@ -632,7 +644,7 @@ static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
                DS2780_EEPROM_BLOCK1_END -
                DS2780_EEPROM_BLOCK1_START + 1 - off);
 
-       return ds2780_read_block(dev_info->w1_dev, buf,
+       return ds2780_read_block(dev_info, buf,
                                DS2780_EEPROM_BLOCK1_START + off, count);
 }
 
@@ -650,7 +662,7 @@ static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
                DS2780_EEPROM_BLOCK1_END -
                DS2780_EEPROM_BLOCK1_START + 1 - off);
 
-       ret = ds2780_write(dev_info->w1_dev, buf,
+       ret = ds2780_write(dev_info, buf,
                                DS2780_EEPROM_BLOCK1_START + off, count);
        if (ret < 0)
                return ret;
@@ -685,9 +697,8 @@ static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
                DS2780_EEPROM_BLOCK0_END -
                DS2780_EEPROM_BLOCK0_START + 1 - off);
 
-       return ds2780_read_block(dev_info->w1_dev, buf,
+       return ds2780_read_block(dev_info, buf,
                                DS2780_EEPROM_BLOCK0_START + off, count);
-
 }
 
 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
@@ -704,7 +715,7 @@ static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
                DS2780_EEPROM_BLOCK0_END -
                DS2780_EEPROM_BLOCK0_START + 1 - off);
 
-       ret = ds2780_write(dev_info->w1_dev, buf,
+       ret = ds2780_write(dev_info, buf,
                                DS2780_EEPROM_BLOCK0_START + off, count);
        if (ret < 0)
                return ret;
@@ -768,6 +779,7 @@ static int __devinit ds2780_battery_probe(struct platform_device *pdev)
        dev_info->bat.properties        = ds2780_battery_props;
        dev_info->bat.num_properties    = ARRAY_SIZE(ds2780_battery_props);
        dev_info->bat.get_property      = ds2780_battery_get_property;
+       dev_info->mutex_holder          = current;
 
        ret = power_supply_register(&pdev->dev, &dev_info->bat);
        if (ret) {
@@ -797,6 +809,8 @@ static int __devinit ds2780_battery_probe(struct platform_device *pdev)
                goto fail_remove_bin_file;
        }
 
+       dev_info->mutex_holder = NULL;
+
        return 0;
 
 fail_remove_bin_file:
@@ -816,6 +830,8 @@ static int __devexit ds2780_battery_remove(struct platform_device *pdev)
 {
        struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 
+       dev_info->mutex_holder = current;
+
        /* remove attributes */
        sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 
@@ -832,7 +848,7 @@ static struct platform_driver ds2780_battery_driver = {
                .name = "ds2780-battery",
        },
        .probe    = ds2780_battery_probe,
-       .remove   = ds2780_battery_remove,
+       .remove   = __devexit_p(ds2780_battery_remove),
 };
 
 static int __init ds2780_battery_init(void)