diff options
Diffstat (limited to 'drivers/misc/apds9802als.c')
| -rw-r--r-- | drivers/misc/apds9802als.c | 167 |
1 files changed, 103 insertions, 64 deletions
diff --git a/drivers/misc/apds9802als.c b/drivers/misc/apds9802als.c index fbe49602f39..f9b91ba8900 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, |