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authorHong Liu <hong.liu@intel.com>2010-10-26 14:22:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:15 -0700
commitf0cfec11180973e4f4b2b6909623e47eaaf7ecfe (patch)
tree5ffda7ed37b00be575d0568c9fda4453685cadc0
parent22d96aa59cf120db3584e4c3365554cae77d2441 (diff)
downloadlinux-linaro-stable-f0cfec11180973e4f4b2b6909623e47eaaf7ecfe.tar.gz
drivers/misc/apds9802als.c: add runtime PM support
Update the driver for the needed runtime power features. Remove the old user controlled power functions. [akpm@linux-foundation.org: put PM code under CONFIG_PM] Signed-off-by: Hong Liu <hong.liu@intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/misc/apds9802als.c167
1 files changed, 103 insertions, 64 deletions
diff --git a/drivers/misc/apds9802als.c b/drivers/misc/apds9802als.c
index fbe49602f396..f9b91ba8900c 100644
--- a/drivers/misc/apds9802als.c
+++ b/drivers/misc/apds9802als.c
@@ -29,19 +29,16 @@
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
-#include <linux/hwmon-sysfs.h>
+#include <linux/pm_runtime.h>
#define ALS_MIN_RANGE_VAL 1
#define ALS_MAX_RANGE_VAL 2
#define POWER_STA_ENABLE 1
#define POWER_STA_DISABLE 0
-#define APDS9802ALS_I2C_ADDR 0x29
#define DRIVER_NAME "apds9802als"
struct als_data {
- struct device *hwmon_dev;
- bool needresume;
struct mutex mutex;
};
@@ -60,29 +57,64 @@ static ssize_t als_sensing_range_show(struct device *dev,
return sprintf(buf, "65535\n");
}
+static int als_wait_for_data_ready(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+ int retry = 10;
+
+ do {
+ msleep(30);
+ ret = i2c_smbus_read_byte_data(client, 0x86);
+ } while (!(ret & 0x80) && retry--);
+
+ if (!retry) {
+ dev_warn(dev, "timeout waiting for data ready\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
static ssize_t als_lux0_input_data_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct als_data *data = i2c_get_clientdata(client);
- unsigned int ret_val;
+ int ret_val;
int temp;
/* Protect against parallel reads */
+ pm_runtime_get_sync(dev);
mutex_lock(&data->mutex);
- temp = i2c_smbus_read_byte_data(client, 0x8C);/*LSB data*/
+
+ /* clear EOC interrupt status */
+ i2c_smbus_write_byte(client, 0x40);
+ /* start measurement */
+ temp = i2c_smbus_read_byte_data(client, 0x81);
+ i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);
+
+ ret_val = als_wait_for_data_ready(dev);
+ if (ret_val < 0)
+ goto failed;
+
+ temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
if (temp < 0) {
ret_val = temp;
goto failed;
}
- ret_val = i2c_smbus_read_byte_data(client, 0x8D);/*MSB data*/
+ ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
if (ret_val < 0)
goto failed;
+
mutex_unlock(&data->mutex);
- ret_val = (ret_val << 8) | temp;
- return sprintf(buf, "%d\n", ret_val);
+ pm_runtime_put_sync(dev);
+
+ temp = (ret_val << 8) | temp;
+ return sprintf(buf, "%d\n", temp);
failed:
mutex_unlock(&data->mutex);
+ pm_runtime_put_sync(dev);
return ret_val;
}
@@ -104,9 +136,10 @@ static ssize_t als_sensing_range_store(struct device *dev,
else
return -ERANGE;
+ pm_runtime_get_sync(dev);
+
/* Make sure nobody else reads/modifies/writes 0x81 while we
are active */
-
mutex_lock(&data->mutex);
ret_val = i2c_smbus_read_byte_data(client, 0x81);
@@ -116,34 +149,25 @@ static ssize_t als_sensing_range_store(struct device *dev,
/* Reset the bits before setting them */
ret_val = ret_val & 0xFA;
- if (val == 1) /* Setting the continous measurement up to 4k LUX */
- ret_val = (ret_val | 0x05);
- else /* Setting the continous measurement up to 64k LUX*/
- ret_val = (ret_val | 0x04);
+ if (val == 1) /* Setting detection range up to 4k LUX */
+ ret_val = (ret_val | 0x01);
+ else /* Setting detection range up to 64k LUX*/
+ ret_val = (ret_val | 0x00);
ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);
+
if (ret_val >= 0) {
/* All OK */
mutex_unlock(&data->mutex);
+ pm_runtime_put_sync(dev);
return count;
}
fail:
mutex_unlock(&data->mutex);
+ pm_runtime_put_sync(dev);
return ret_val;
}
-static ssize_t als_power_status_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct i2c_client *client = to_i2c_client(dev);
- int ret_val;
- ret_val = i2c_smbus_read_byte_data(client, 0x80);
- if (ret_val < 0)
- return ret_val;
- ret_val = ret_val & 0x01;
- return sprintf(buf, "%d\n", ret_val);
-}
-
static int als_set_power_state(struct i2c_client *client, bool on_off)
{
int ret_val;
@@ -163,39 +187,13 @@ fail:
return ret_val;
}
-static ssize_t als_power_status_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t count)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct als_data *data = i2c_get_clientdata(client);
- unsigned long val;
- int ret_val;
-
- if (strict_strtoul(buf, 10, &val))
- return -EINVAL;
- if (val == POWER_STA_ENABLE) {
- ret_val = als_set_power_state(client, true);
- data->needresume = true;
- } else if (val == POWER_STA_DISABLE) {
- ret_val = als_set_power_state(client, false);
- data->needresume = false;
- } else
- return -EINVAL;
- if (ret_val < 0)
- return ret_val;
- return count;
-}
-
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
als_sensing_range_show, als_sensing_range_store);
static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL);
-static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
- als_power_status_show, als_power_status_store);
static struct attribute *mid_att_als[] = {
&dev_attr_lux0_sensor_range.attr,
&dev_attr_lux0_input.attr,
- &dev_attr_power_state.attr,
NULL
};
@@ -213,15 +211,21 @@ static int als_set_default_config(struct i2c_client *client)
dev_err(&client->dev, "failed default switch on write\n");
return ret_val;
}
- /* Continous from 1Lux to 64k Lux */
- ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x04);
+ /* detection range: 1~64K Lux, maunal measurement */
+ ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
if (ret_val < 0)
dev_err(&client->dev, "failed default LUX on write\n");
+
+ /* We always get 0 for the 1st measurement after system power on,
+ * so make sure it is finished before user asks for data.
+ */
+ als_wait_for_data_ready(&client->dev);
+
return ret_val;
}
-static int apds9802als_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int apds9802als_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
int res;
struct als_data *data;
@@ -237,11 +241,14 @@ static int apds9802als_probe(struct i2c_client *client,
dev_err(&client->dev, "device create file failed\n");
goto als_error1;
}
- dev_info(&client->dev,
- "%s apds9802als: ALS chip found\n", client->name);
+ dev_info(&client->dev, "ALS chip found\n");
als_set_default_config(client);
- data->needresume = true;
mutex_init(&data->mutex);
+
+ pm_runtime_enable(&client->dev);
+ pm_runtime_get(&client->dev);
+ pm_runtime_put(&client->dev);
+
return res;
als_error1:
i2c_set_clientdata(client, NULL);
@@ -252,11 +259,14 @@ als_error1:
static int apds9802als_remove(struct i2c_client *client)
{
struct als_data *data = i2c_get_clientdata(client);
+
+ als_set_power_state(client, false);
sysfs_remove_group(&client->dev.kobj, &m_als_gr);
kfree(data);
return 0;
}
+#ifdef CONFIG_PM
static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
{
als_set_power_state(client, false);
@@ -265,13 +275,42 @@ static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
static int apds9802als_resume(struct i2c_client *client)
{
- struct als_data *data = i2c_get_clientdata(client);
+ als_set_default_config(client);
- if (data->needresume == true)
- als_set_power_state(client, true);
+ pm_runtime_get(&client->dev);
+ pm_runtime_put(&client->dev);
return 0;
}
+static int apds9802als_runtime_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ als_set_power_state(client, false);
+ return 0;
+}
+
+static int apds9802als_runtime_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ als_set_power_state(client, true);
+ return 0;
+}
+
+static const struct dev_pm_ops apds9802als_pm_ops = {
+ .runtime_suspend = apds9802als_runtime_suspend,
+ .runtime_resume = apds9802als_runtime_resume,
+};
+
+#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)
+
+#else /* CONFIG_PM */
+#define apds9802als_suspend NULL
+#define apds9802als_resume NULL
+#define APDS9802ALS_PM_OPS NULL
+#endif /* CONFIG_PM */
+
static struct i2c_device_id apds9802als_id[] = {
{ DRIVER_NAME, 0 },
{ }
@@ -281,8 +320,8 @@ MODULE_DEVICE_TABLE(i2c, apds9802als_id);
static struct i2c_driver apds9802als_driver = {
.driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
+ .name = DRIVER_NAME,
+ .pm = APDS9802ALS_PM_OPS,
},
.probe = apds9802als_probe,
.remove = apds9802als_remove,