diff options
Diffstat (limited to 'drivers/gpio/gpio-pcf857x.c')
| -rw-r--r-- | drivers/gpio/gpio-pcf857x.c | 93 |
1 files changed, 31 insertions, 62 deletions
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c index 2d1de9e7e9b..076e236d0da 100644 --- a/drivers/gpio/gpio-pcf857x.c +++ b/drivers/gpio/gpio-pcf857x.c @@ -61,61 +61,28 @@ struct pcf857x { struct i2c_client *client; struct mutex lock; /* protect 'out' */ unsigned out; /* software latch */ + + int (*write)(struct i2c_client *client, unsigned data); + int (*read)(struct i2c_client *client); }; /*-------------------------------------------------------------------------*/ /* Talk to 8-bit I/O expander */ -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); - 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) -{ - struct pcf857x *gpio = container_of(chip, struct pcf857x, chip); - s32 value; - - value = i2c_smbus_read_byte(gpio->client); - return (value < 0) ? 0 : (value & (1 << offset)); -} - -static int pcf857x_output8(struct gpio_chip *chip, unsigned offset, int value) +static int i2c_write_le8(struct i2c_client *client, unsigned data) { - 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; - status = i2c_smbus_write_byte(gpio->client, gpio->out); - mutex_unlock(&gpio->lock); - - return status; + return i2c_smbus_write_byte(client, data); } -static void pcf857x_set8(struct gpio_chip *chip, unsigned offset, int value) +static int i2c_read_le8(struct i2c_client *client) { - pcf857x_output8(chip, offset, value); + return (int)i2c_smbus_read_byte(client); } -/*-------------------------------------------------------------------------*/ - /* Talk to 16-bit I/O expander */ -static int i2c_write_le16(struct i2c_client *client, u16 word) +static int i2c_write_le16(struct i2c_client *client, unsigned word) { u8 buf[2] = { word & 0xff, word >> 8, }; int status; @@ -135,29 +102,31 @@ static int i2c_read_le16(struct i2c_client *client) return (buf[1] << 8) | buf[0]; } -static int pcf857x_input16(struct gpio_chip *chip, unsigned offset) +/*-------------------------------------------------------------------------*/ + +static int pcf857x_input(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); - status = i2c_write_le16(gpio->client, gpio->out); + status = gpio->write(gpio->client, gpio->out); mutex_unlock(&gpio->lock); return status; } -static int pcf857x_get16(struct gpio_chip *chip, unsigned offset) +static int pcf857x_get(struct gpio_chip *chip, unsigned offset) { struct pcf857x *gpio = container_of(chip, struct pcf857x, chip); int value; - value = i2c_read_le16(gpio->client); + value = gpio->read(gpio->client); return (value < 0) ? 0 : (value & (1 << offset)); } -static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value) +static int pcf857x_output(struct gpio_chip *chip, unsigned offset, int value) { struct pcf857x *gpio = container_of(chip, struct pcf857x, chip); unsigned bit = 1 << offset; @@ -168,15 +137,15 @@ static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value) gpio->out |= bit; else gpio->out &= ~bit; - status = i2c_write_le16(gpio->client, gpio->out); + status = gpio->write(gpio->client, gpio->out); mutex_unlock(&gpio->lock); return status; } -static void pcf857x_set16(struct gpio_chip *chip, unsigned offset, int value) +static void pcf857x_set(struct gpio_chip *chip, unsigned offset, int value) { - pcf857x_output16(chip, offset, value); + pcf857x_output(chip, offset, value); } /*-------------------------------------------------------------------------*/ @@ -200,10 +169,15 @@ static int pcf857x_probe(struct i2c_client *client, mutex_init(&gpio->lock); - gpio->chip.base = pdata ? pdata->gpio_base : -1; - gpio->chip.can_sleep = 1; - gpio->chip.dev = &client->dev; - gpio->chip.owner = THIS_MODULE; + gpio->chip.base = pdata ? pdata->gpio_base : -1; + gpio->chip.can_sleep = 1; + gpio->chip.dev = &client->dev; + gpio->chip.owner = THIS_MODULE; + gpio->chip.get = pcf857x_get; + gpio->chip.set = pcf857x_set; + gpio->chip.direction_input = pcf857x_input; + gpio->chip.direction_output = pcf857x_output; + gpio->chip.ngpio = id->driver_data; /* NOTE: the OnSemi jlc1562b is also largely compatible with * these parts, notably for output. It has a low-resolution @@ -216,12 +190,9 @@ static int pcf857x_probe(struct i2c_client *client, * * NOTE: we don't distinguish here between *4 and *4a parts. */ - gpio->chip.ngpio = id->driver_data; if (gpio->chip.ngpio == 8) { - gpio->chip.direction_input = pcf857x_input8; - gpio->chip.get = pcf857x_get8; - gpio->chip.direction_output = pcf857x_output8; - gpio->chip.set = pcf857x_set8; + gpio->write = i2c_write_le8; + gpio->read = i2c_read_le8; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) @@ -238,10 +209,8 @@ static int pcf857x_probe(struct i2c_client *client, * NOTE: we don't distinguish here between '75 and '75c parts. */ } else if (gpio->chip.ngpio == 16) { - gpio->chip.direction_input = pcf857x_input16; - gpio->chip.get = pcf857x_get16; - gpio->chip.direction_output = pcf857x_output16; - gpio->chip.set = pcf857x_set16; + gpio->write = i2c_write_le16; + gpio->read = i2c_read_le16; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) status = -EIO; |