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iio:light:stk3310: add more error handling 

Check for the following error cases:
  * lower boundary for val in _write_event
  * return value of regmap_(field_)read
  * possible values for chan->type
  * return value of stk3310_gpio_probe

Also add an error path in _probe to put the sensor back into stand-by mode
in case of serious errors.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Hartmut Knaack 2015-07-09 23:51:31 +02:00 committed by Jonathan Cameron
parent b465fc5499
commit 7c7a9eeaa3
1 changed files with 45 additions and 14 deletions
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59
drivers/iio/light/stk3310.c
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@ -241,8 +241,11 @@ static int stk3310_write_event(struct iio_dev *indio_dev,
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
regmap_field_read(data->reg_ps_gain, &index);
if (val > stk3310_ps_max[index])
ret = regmap_field_read(data->reg_ps_gain, &index);
if (ret < 0)
return ret;
if (val < 0 || val > stk3310_ps_max[index])
return -EINVAL;
if (dir == IIO_EV_DIR_RISING)
@ -266,9 +269,12 @@ static int stk3310_read_event_config(struct iio_dev *indio_dev,
enum iio_event_direction dir)
{
unsigned int event_val;
int ret;
struct stk3310_data *data = iio_priv(indio_dev);
regmap_field_read(data->reg_int_ps, &event_val);
ret = regmap_field_read(data->reg_int_ps, &event_val);
if (ret < 0)
return ret;
return event_val;
}
@ -307,14 +313,16 @@ static int stk3310_read_raw(struct iio_dev *indio_dev,
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (chan->type == IIO_LIGHT)
reg = STK3310_REG_ALS_DATA_MSB;
else if (chan->type == IIO_PROXIMITY)
reg = STK3310_REG_PS_DATA_MSB;
else
return -EINVAL;
reg = STK3310_REG_PS_DATA_MSB;
mutex_lock(&data->lock);
ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
if (ret < 0) {
@ -327,17 +335,23 @@ static int stk3310_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
if (chan->type == IIO_LIGHT)
regmap_field_read(data->reg_als_it, &index);
ret = regmap_field_read(data->reg_als_it, &index);
else
regmap_field_read(data->reg_ps_it, &index);
ret = regmap_field_read(data->reg_ps_it, &index);
if (ret < 0)
return ret;
*val = stk3310_it_table[index][0];
*val2 = stk3310_it_table[index][1];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SCALE:
if (chan->type == IIO_LIGHT)
regmap_field_read(data->reg_als_gain, &index);
ret = regmap_field_read(data->reg_als_gain, &index);
else
regmap_field_read(data->reg_ps_gain, &index);
ret = regmap_field_read(data->reg_ps_gain, &index);
if (ret < 0)
return ret;
*val = stk3310_scale_table[index][0];
*val2 = stk3310_scale_table[index][1];
return IIO_VAL_INT_PLUS_MICRO;
@ -354,6 +368,9 @@ static int stk3310_write_raw(struct iio_dev *indio_dev,
int index;
struct stk3310_data *data = iio_priv(indio_dev);
if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
index = stk3310_get_index(stk3310_it_table,
@ -435,7 +452,10 @@ static int stk3310_init(struct iio_dev *indio_dev)
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
regmap_read(data->regmap, STK3310_REG_ID, &chipid);
ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
if (ret < 0)
return ret;
if (chipid != STK3310_CHIP_ID_VAL &&
chipid != STK3311_CHIP_ID_VAL) {
dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
@ -608,8 +628,13 @@ static int stk3310_probe(struct i2c_client *client,
if (ret < 0)
return ret;
if (client->irq < 0)
if (client->irq < 0) {
client->irq = stk3310_gpio_probe(client);
if (client->irq < 0) {
ret = client->irq;
goto err_standby;
}
}
if (client->irq >= 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
@ -618,17 +643,23 @@ static int stk3310_probe(struct i2c_client *client,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
STK3310_EVENT, indio_dev);
if (ret < 0)
if (ret < 0) {
dev_err(&client->dev, "request irq %d failed\n",
client->irq);
goto err_standby;
}
}
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "device_register failed\n");
stk3310_set_state(data, STK3310_STATE_STANDBY);
goto err_standby;
}
return 0;
err_standby:
stk3310_set_state(data, STK3310_STATE_STANDBY);
return ret;
}