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path: root/drivers/hwmon/sht15.c
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Diffstat (limited to 'drivers/hwmon/sht15.c')
-rw-r--r--drivers/hwmon/sht15.c54
1 files changed, 46 insertions, 8 deletions
diff --git a/drivers/hwmon/sht15.c b/drivers/hwmon/sht15.c
index 080af75c517b..3182b3f578e2 100644
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -33,11 +33,13 @@
/* Commands */
#define SHT15_MEASURE_TEMP 0x03
#define SHT15_MEASURE_RH 0x05
+#define SHT15_SOFT_RESET 0x1E
/* Min timings */
#define SHT15_TSCKL 100 /* (nsecs) clock low */
#define SHT15_TSCKH 100 /* (nsecs) clock high */
#define SHT15_TSU 150 /* (nsecs) data setup time */
+#define SHT15_TSRST 11 /* (msecs) soft reset time */
/* Actions the driver may be doing */
enum sht15_state {
@@ -229,6 +231,24 @@ static int sht15_send_cmd(struct sht15_data *data, u8 cmd)
}
/**
+ * sht15_soft_reset() - send a soft reset command
+ * @data: sht15 specific data.
+ *
+ * As described in section 3.2 of the datasheet.
+ */
+static int sht15_soft_reset(struct sht15_data *data)
+{
+ int ret;
+
+ ret = sht15_send_cmd(data, SHT15_SOFT_RESET);
+ if (ret)
+ return ret;
+ msleep(SHT15_TSRST);
+
+ return 0;
+}
+
+/**
* sht15_measurement() - get a new value from device
* @data: device instance specific data
* @command: command sent to request value
@@ -588,13 +608,20 @@ static int __devinit sht15_probe(struct platform_device *pdev)
*/
data->nb.notifier_call = &sht15_invalidate_voltage;
ret = regulator_register_notifier(data->reg, &data->nb);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "regulator notifier request failed\n");
+ regulator_disable(data->reg);
+ regulator_put(data->reg);
+ goto err_free_data;
+ }
}
/* Try requesting the GPIOs */
ret = gpio_request(data->pdata->gpio_sck, "SHT15 sck");
if (ret) {
dev_err(&pdev->dev, "gpio request failed\n");
- goto err_free_data;
+ goto err_release_reg;
}
gpio_direction_output(data->pdata->gpio_sck, 0);
@@ -603,11 +630,6 @@ static int __devinit sht15_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "gpio request failed\n");
goto err_release_gpio_sck;
}
- ret = sysfs_create_group(&pdev->dev.kobj, &sht15_attr_group);
- if (ret) {
- dev_err(&pdev->dev, "sysfs create failed");
- goto err_release_gpio_data;
- }
ret = request_irq(gpio_to_irq(data->pdata->gpio_data),
sht15_interrupt_fired,
@@ -620,22 +642,38 @@ static int __devinit sht15_probe(struct platform_device *pdev)
}
disable_irq_nosync(gpio_to_irq(data->pdata->gpio_data));
sht15_connection_reset(data);
- sht15_send_cmd(data, 0x1E);
+ ret = sht15_soft_reset(data);
+ if (ret)
+ goto err_release_irq;
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &sht15_attr_group);
+ if (ret) {
+ dev_err(&pdev->dev, "sysfs create failed\n");
+ goto err_release_irq;
+ }
data->hwmon_dev = hwmon_device_register(data->dev);
if (IS_ERR(data->hwmon_dev)) {
ret = PTR_ERR(data->hwmon_dev);
- goto err_release_irq;
+ goto err_release_sysfs_group;
}
return 0;
+err_release_sysfs_group:
+ sysfs_remove_group(&pdev->dev.kobj, &sht15_attr_group);
err_release_irq:
free_irq(gpio_to_irq(data->pdata->gpio_data), data);
err_release_gpio_data:
gpio_free(data->pdata->gpio_data);
err_release_gpio_sck:
gpio_free(data->pdata->gpio_sck);
+err_release_reg:
+ if (!IS_ERR(data->reg)) {
+ regulator_unregister_notifier(data->reg, &data->nb);
+ regulator_disable(data->reg);
+ regulator_put(data->reg);
+ }
err_free_data:
kfree(data);
error_ret: