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path: root/drivers/gpio/pcf857x.c
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Diffstat (limited to 'drivers/gpio/pcf857x.c')
-rw-r--r--drivers/gpio/pcf857x.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/gpio/pcf857x.c b/drivers/gpio/pcf857x.c
index aa6cc8b2a2b..d25d356c4f2 100644
--- a/drivers/gpio/pcf857x.c
+++ b/drivers/gpio/pcf857x.c
@@ -37,6 +37,8 @@ static const struct i2c_device_id pcf857x_id[] = {
{ "pca9671", 16 },
{ "pca9673", 16 },
{ "pca9675", 16 },
+ { "max7328", 8 },
+ { "max7329", 8 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pcf857x_id);
@@ -56,6 +58,7 @@ MODULE_DEVICE_TABLE(i2c, pcf857x_id);
struct pcf857x {
struct gpio_chip chip;
struct i2c_client *client;
+ struct mutex lock; /* protect 'out' */
unsigned out; /* software latch */
};
@@ -66,9 +69,14 @@ struct pcf857x {
static int pcf857x_input8(struct gpio_chip *chip, unsigned offset)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ int status;
+ mutex_lock(&gpio->lock);
gpio->out |= (1 << offset);
- return i2c_smbus_write_byte(gpio->client, gpio->out);
+ status = i2c_smbus_write_byte(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
}
static int pcf857x_get8(struct gpio_chip *chip, unsigned offset)
@@ -84,12 +92,17 @@ static int pcf857x_output8(struct gpio_chip *chip, unsigned offset, int value)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
unsigned bit = 1 << offset;
+ int status;
+ mutex_lock(&gpio->lock);
if (value)
gpio->out |= bit;
else
gpio->out &= ~bit;
- return i2c_smbus_write_byte(gpio->client, gpio->out);
+ status = i2c_smbus_write_byte(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
}
static void pcf857x_set8(struct gpio_chip *chip, unsigned offset, int value)
@@ -124,9 +137,14 @@ static int i2c_read_le16(struct i2c_client *client)
static int pcf857x_input16(struct gpio_chip *chip, unsigned offset)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ int status;
+ mutex_lock(&gpio->lock);
gpio->out |= (1 << offset);
- return i2c_write_le16(gpio->client, gpio->out);
+ status = i2c_write_le16(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
}
static int pcf857x_get16(struct gpio_chip *chip, unsigned offset)
@@ -142,12 +160,17 @@ static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
unsigned bit = 1 << offset;
+ int status;
+ mutex_lock(&gpio->lock);
if (value)
gpio->out |= bit;
else
gpio->out &= ~bit;
- return i2c_write_le16(gpio->client, gpio->out);
+ status = i2c_write_le16(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
}
static void pcf857x_set16(struct gpio_chip *chip, unsigned offset, int value)
@@ -173,6 +196,8 @@ static int pcf857x_probe(struct i2c_client *client,
if (!gpio)
return -ENOMEM;
+ mutex_init(&gpio->lock);
+
gpio->chip.base = pdata->gpio_base;
gpio->chip.can_sleep = 1;
gpio->chip.owner = THIS_MODULE;