diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-pca953x.c | 49 |
1 files changed, 18 insertions, 31 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 2e02b3a9ac48..551fa69661b2 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -206,9 +206,16 @@ static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val) return i2c_smbus_write_byte_data(chip->client, reg, *val); } -static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val) +static int pca953x_write_regs_mul(struct pca953x_chip *chip, int reg, u8 *val) { - u32 regaddr = (reg << 1); + int bank_shift = pca953x_bank_shift(chip); + int addr = (reg & PCAL_GPIO_MASK) << bank_shift; + int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1; + u8 regaddr = pinctrl | addr; + + /* Chips with 24 and more GPIOs always support Auto Increment */ + if (NBANK(chip) > 2) + regaddr |= REG_ADDR_AI; /* PCA9575 needs address-increment on multi-byte writes */ if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) @@ -218,17 +225,6 @@ static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val) NBANK(chip), val); } -static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val) -{ - int bank_shift = pca953x_bank_shift(chip); - int addr = (reg & PCAL_GPIO_MASK) << bank_shift; - int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1; - - return i2c_smbus_write_i2c_block_data(chip->client, - pinctrl | addr | REG_ADDR_AI, - NBANK(chip), val); -} - static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) { int ret = 0; @@ -252,24 +248,18 @@ static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val) return ret; } -static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val) -{ - int ret; - - ret = i2c_smbus_read_word_data(chip->client, reg << 1); - put_unaligned(ret, (u16 *)val); - - return ret; -} - -static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val) +static int pca953x_read_regs_mul(struct pca953x_chip *chip, int reg, u8 *val) { int bank_shift = pca953x_bank_shift(chip); int addr = (reg & PCAL_GPIO_MASK) << bank_shift; int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1; + u8 regaddr = pinctrl | addr; + + /* Chips with 24 and more GPIOs always support Auto Increment */ + if (NBANK(chip) > 2) + regaddr |= REG_ADDR_AI; - return i2c_smbus_read_i2c_block_data(chip->client, - pinctrl | addr | REG_ADDR_AI, + return i2c_smbus_read_i2c_block_data(chip->client, regaddr, NBANK(chip), val); } @@ -885,12 +875,9 @@ static int pca953x_probe(struct i2c_client *client, if (chip->gpio_chip.ngpio <= 8) { chip->write_regs = pca953x_write_regs_8; chip->read_regs = pca953x_read_regs_8; - } else if (chip->gpio_chip.ngpio >= 24) { - chip->write_regs = pca953x_write_regs_24; - chip->read_regs = pca953x_read_regs_24; } else { - chip->write_regs = pca953x_write_regs_16; - chip->read_regs = pca953x_read_regs_16; + chip->write_regs = pca953x_write_regs_mul; + chip->read_regs = pca953x_read_regs_mul; } if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) |