- 14 Sep, 2013 15 commits
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Peter Meerwald authored
Integration time is in seconds; it controls the measurement time and influences the gain of a sensor. There are two typical ways that scaling is implemented in a device: 1) input amplifier, 2) reference to the ADC is changed. These both result in the accuracy of the ADC varying (by applying its sampling over a more relevant range). Integration time is a way of dealing with noise inherent in the analog sensor itself. In the case of a light sensor, a mixture of photon noise and device specific noise. Photon noise is dealt with by either improving the efficiency of the sensor, (more photons actually captured) which is not easily varied dynamically, or by integrating the measurement over a longer time period. Note that this can also be thought of as an averaging of a number of individual samples and is infact sometimes implemented this way. Altering integration time implies that the duration of a measurement changes, a fact the device's user may be interested in. Hence it makes sense to distinguish between integration time and simple scale. In some devices both types of control are present and whilst they will have similar effects on the amplitude of the reading, their effect on the noise of the measurements will differ considerably. Used by adjd_s311, tsl4531, tcs3472 The following drivers have similar controls (and could be adapted): * tsl2563 (integration time is controlled via CALIBSCALE among other things) * tsl2583 (has integration_time device_attr, but driver doesn't use channels yet) * tsl2x7x (has integration_time attr) Signed-off-by:
Peter Meerwald <pmeerw@pmeerw.net> Cc: Jon Brenner <jon.brenner@ams.com> Signed-off-by:
Jonathan Cameron <jic23@kernel.org>
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
Sachin Kamat <sachin.kamat@linaro.org> Cc: Barry Song <21cnbao@gmail.com> Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
dev_err is preferred over pr_err. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. This patch also fixes the missing gpio_free call in remove. Signed-off-by:
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Sachin Kamat authored
'break' after return is redundant. Remove it. Signed-off-by:
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Sachin Kamat authored
'break' after return is redundant. Remove it. Signed-off-by:
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Sachin Kamat authored
'break' after return is redundant. Remove it. Signed-off-by:
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Sachin Kamat authored
'break' after return is redundant. Remove it. Signed-off-by:
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Sachin Kamat authored
'break' after return is redundant. Remove it. Signed-off-by:
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- 11 Sep, 2013 2 commits
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Peter Meerwald authored
Signed-off-by:
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Sachin Kamat authored
Updated with the current one. Signed-off-by:
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- 09 Sep, 2013 1 commit
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Xie XiuQi authored
Remove unnecessary work pending test before calling schedule_work(). It has been tested in queue_work_on() already. No functional changed. Signed-off-by:
Xie XiuQi <xiexiuqi@huawei.com> Reviewed-by:
Tejun Heo <tj@kernel.org> Acked-by:
Michael Hennerich <michael.hennerich@analog.com> Signed-off-by:
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- 08 Sep, 2013 3 commits
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Fabio Estevam authored
Add MODULE_ALIAS, so that auto module loading can work. Signed-off-by:
Fabio Estevam <fabio.estevam@freescale.com> Acked-by:
Marek Vasut <marex@denx.de> Signed-off-by:
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Fabio Estevam authored
Fix the order of resources removal in the error path of mxs_lradc_probe() and also in mxs_lradc_remove(). Signed-off-by:
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Jingoo Han authored
The usage of strict_strto*() is not preferred, because strict_strto*() is obsolete. Thus, kstrto*() should be used. Previously, there were only strict_strtol(), strict_strtoul(), strict_strtoull(), and strict_strtoll(). Thus, when converting to the variables, only long, unsigned long, unsigned long long, and long long can be used. However, kstrto*() provides various functions handling all types of variables. Therefore, the types of variables can be changed properly. Signed-off-by:
Jingoo Han <jg1.han@samsung.com> Signed-off-by:
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- 07 Sep, 2013 19 commits
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Angelo Compagnucci authored
Sysfs access to all channels. Signed-off-by:
Angelo Compagnucci <angelo.compagnucci@gmail.com> Signed-off-by:
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Sachin Kamat authored
Add a missing closing brace. Signed-off-by:
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Sachin Kamat authored
Silences the following warning: drivers/staging/iio/light/tsl2x7x_core.c:553:70: warning: Using plain integer as NULL pointer Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes code simpler. Signed-off-by:
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Sachin Kamat authored
devm_iio_device_alloc makes the code simple. While at it also fixed an uninitialized return with -EINVAL. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. This also fixes an error in return type during clk_get failure. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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Sachin Kamat authored
devm_* APIs are device managed and make code simpler. Signed-off-by:
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