diff options
| author | Andreas Schallenberg <Andreas.Schallenberg@3alitytechnica.com> | 2012-05-21 09:52:43 +0200 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-05-25 18:50:41 -0600 |
| commit | 96b70641b937e99c1579cb6ebbcdb7b0af98cdd0 (patch) | |
| tree | c2a31be5f5160f345b5f3f1c450d01b158dc8b96 | |
| parent | 0df2c999f748c9528f6629f45baaa86118d60cd1 (diff) | |
| download | linux-96b70641b937e99c1579cb6ebbcdb7b0af98cdd0.tar.bz2 | |
gpio/tca6424: merge I2C transactions, remove cast
This is a follow-up to ae79c1904 "[PATCH v2] Add support for TCA6424"
merged in the v3.5 merge window. It fixes comments made when the
patch was merged.
- Use 3 byte transfers instead of two separate transfers (2+1 byte)
- An unnecessary cast removed
Signed-off-by: Andreas Schallenberg <Andreas.Schallenberg@3alitytechnica.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
| -rw-r--r-- | drivers/gpio/gpio-pca953x.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 1c313c710be3..de24af202447 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -98,12 +98,11 @@ static int pca953x_write_reg(struct pca953x_chip *chip, int reg, u32 val) if (chip->gpio_chip.ngpio <= 8) ret = i2c_smbus_write_byte_data(chip->client, reg, val); else if (chip->gpio_chip.ngpio == 24) { - ret = i2c_smbus_write_word_data(chip->client, + cpu_to_le32s(&val); + ret = i2c_smbus_write_i2c_block_data(chip->client, (reg << 2) | REG_ADDR_AI, - val & 0xffff); - ret = i2c_smbus_write_byte_data(chip->client, - (reg << 2) + 2, - (val & 0xff0000) >> 16); + 3, + (u8 *) &val); } else { switch (chip->chip_type) { @@ -135,22 +134,27 @@ static int pca953x_read_reg(struct pca953x_chip *chip, int reg, u32 *val) { int ret; - if (chip->gpio_chip.ngpio <= 8) + if (chip->gpio_chip.ngpio <= 8) { ret = i2c_smbus_read_byte_data(chip->client, reg); - else if (chip->gpio_chip.ngpio == 24) { - ret = i2c_smbus_read_word_data(chip->client, reg << 2); - ret |= (i2c_smbus_read_byte_data(chip->client, - (reg << 2) + 2)<<16); + *val = ret; } - else + else if (chip->gpio_chip.ngpio == 24) { + *val = 0; + ret = i2c_smbus_read_i2c_block_data(chip->client, + (reg << 2) | REG_ADDR_AI, + 3, + (u8 *) val); + le32_to_cpus(val); + } else { ret = i2c_smbus_read_word_data(chip->client, reg << 1); + *val = ret; + } if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n"); return ret; } - *val = (u32)ret; return 0; } |