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Input: pwm-beeper - support customized freq for SND_BELL

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Extend the pwm-beeper driver to support customized frequency for SND_BELL
from device properties.

Signed-off-by: Guan Ben <ben.guan@cn.bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com>
Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Guan Ben 2017-03-07 10:25:27 -08:00 committed by Dmitry Torokhov
parent a3cbfd56ff
commit fad358a06c
2 changed files with 15 additions and 1 deletions
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1
Documentation/devicetree/bindings/input/pwm-beeper.txt
View File

@ -8,6 +8,7 @@ Required properties:
Optional properties:
- amp-supply: phandle to a regulator that acts as an amplifier for the beeper
- beeper-hz: bell frequency in Hz
Example:

15
drivers/input/misc/pwm-beeper.c
View File

@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
@ -29,6 +30,7 @@ struct pwm_beeper {
struct regulator *amplifier;
struct work_struct work;
unsigned long period;
unsigned int bell_frequency;
bool suspended;
bool amplifier_on;
};
@ -94,7 +96,7 @@ static int pwm_beeper_event(struct input_dev *input,
switch (code) {
case SND_BELL:
value = value ? 1000 : 0;
value = value ? beeper->bell_frequency : 0;
break;
case SND_TONE:
break;
@ -131,6 +133,7 @@ static int pwm_beeper_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct pwm_beeper *beeper;
struct pwm_state state;
u32 bell_frequency;
int error;
beeper = devm_kzalloc(dev, sizeof(*beeper), GFP_KERNEL);
@ -167,6 +170,16 @@ static int pwm_beeper_probe(struct platform_device *pdev)
INIT_WORK(&beeper->work, pwm_beeper_work);
error = device_property_read_u32(dev, "beeper-hz", &bell_frequency);
if (error) {
bell_frequency = 1000;
dev_dbg(dev,
"failed to parse 'beeper-hz' property, using default: %uHz\n",
bell_frequency);
}
beeper->bell_frequency = bell_frequency;
beeper->input = devm_input_allocate_device(dev);
if (!beeper->input) {
dev_err(dev, "Failed to allocate input device\n");