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Input: cyapa - add regulator vcc support

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We need to power up the chip before we can initialize it.

On systems that delegate task of powering up regulators to firmware we
assume that we'll be simply given a dummy regulator.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dudley Du 2015-07-30 11:19:18 -07:00 committed by Dmitry Torokhov
parent 02d9bd05dc
commit 36e9615bd7
2 changed files with 30 additions and 0 deletions
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29
drivers/input/mouse/cyapa.c
View file

@ -21,6 +21,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/pm_runtime.h>
@ -1241,6 +1242,13 @@ static void cyapa_remove_sysfs_group(void *data)
sysfs_remove_group(&cyapa->client->dev.kobj, &cyapa_sysfs_group);
}
static void cyapa_disable_regulator(void *data)
{
struct cyapa *cyapa = data;
regulator_disable(cyapa->vcc);
}
static int cyapa_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
@ -1274,6 +1282,27 @@ static int cyapa_probe(struct i2c_client *client,
sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
client->addr);
cyapa->vcc = devm_regulator_get(dev, "vcc");
if (IS_ERR(cyapa->vcc)) {
error = PTR_ERR(cyapa->vcc);
dev_err(dev, "failed to get vcc regulator: %d\n", error);
return error;
}
error = regulator_enable(cyapa->vcc);
if (error) {
dev_err(dev, "failed to enable regulator: %d\n", error);
return error;
}
error = devm_add_action(dev, cyapa_disable_regulator, cyapa);
if (error) {
cyapa_disable_regulator(cyapa);
dev_err(dev, "failed to add disable regulator action: %d\n",
error);
return error;
}
error = cyapa_initialize(cyapa);
if (error) {
dev_err(dev, "failed to detect and initialize tp device.\n");

1
drivers/input/mouse/cyapa.h
View file

@ -321,6 +321,7 @@ struct cyapa {
u8 status[BL_STATUS_SIZE];
bool operational; /* true: ready for data reporting; false: not. */
struct regulator *vcc;
struct i2c_client *client;
struct input_dev *input;
char phys[32]; /* Device physical location */