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gpio: pca954x: Add vcc regulator and enable it 

Some i2c gpio devices are connected to a switchable power supply
which needs to be enabled prior to probing the device. This patch
allows the drive to enable the devices vcc regulator prior to probing.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Phil Reid 2016-07-29 11:39:55 +08:00 committed by Linus Walleij
parent 65053e1a77
commit e23efa3111
1 changed files with 32 additions and 9 deletions
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41
drivers/gpio/gpio-pca953x.c
View File

@ -21,6 +21,7 @@
#include <asm/unaligned.h>
#include <linux/of_platform.h>
#include <linux/acpi.h>
#include <linux/regulator/consumer.h>
#define PCA953X_INPUT 0
#define PCA953X_OUTPUT 1
@ -113,6 +114,7 @@ struct pca953x_chip {
const char *const *names;
int chip_type;
unsigned long driver_data;
struct regulator *regulator;
};
static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
@ -746,6 +748,7 @@ static int pca953x_probe(struct i2c_client *client,
int irq_base = 0;
int ret;
u32 invert = 0;
struct regulator *reg;
chip = devm_kzalloc(&client->dev,
sizeof(struct pca953x_chip), GFP_KERNEL);
@ -765,6 +768,20 @@ static int pca953x_probe(struct i2c_client *client,
chip->client = client;
reg = devm_regulator_get(&client->dev, "vcc");
if (IS_ERR(reg)) {
ret = PTR_ERR(reg);
if (ret != -EPROBE_DEFER)
dev_err(&client->dev, "reg get err: %d\n", ret);
return ret;
}
ret = regulator_enable(reg);
if (ret) {
dev_err(&client->dev, "reg en err: %d\n", ret);
return ret;
}
chip->regulator = reg;
if (id) {
chip->driver_data = id->driver_data;
} else {
@ -776,8 +793,10 @@ static int pca953x_probe(struct i2c_client *client,
chip->driver_data = (int)(uintptr_t)match->data;
} else {
id = acpi_match_device(pca953x_acpi_ids, &client->dev);
if (!id)
return -ENODEV;
if (!id) {
ret = -ENODEV;
goto err_exit;
}
chip->driver_data = id->driver_data;
}
@ -797,15 +816,15 @@ static int pca953x_probe(struct i2c_client *client,
else
ret = device_pca957x_init(chip, invert);
if (ret)
return ret;
goto err_exit;
ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
if (ret)
return ret;
goto err_exit;
ret = pca953x_irq_setup(chip, irq_base);
if (ret)
return ret;
goto err_exit;
if (pdata && pdata->setup) {
ret = pdata->setup(client, chip->gpio_chip.base,
@ -816,6 +835,10 @@ static int pca953x_probe(struct i2c_client *client,
i2c_set_clientdata(client, chip);
return 0;
err_exit:
regulator_disable(chip->regulator);
return ret;
}
static int pca953x_remove(struct i2c_client *client)
@ -827,14 +850,14 @@ static int pca953x_remove(struct i2c_client *client)
if (pdata && pdata->teardown) {
ret = pdata->teardown(client, chip->gpio_chip.base,
chip->gpio_chip.ngpio, pdata->context);
if (ret < 0) {
if (ret < 0)
dev_err(&client->dev, "%s failed, %d\n",
"teardown", ret);
return ret;
}
}
return 0;
regulator_disable(chip->regulator);
return ret;
}
/* convenience to stop overlong match-table lines */