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gpio/tca6424: merge I2C transactions, remove cast

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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>
This commit is contained in:
Andreas Schallenberg 2012-05-21 09:52:43 +02:00 • committed by Grant Likely
parent 0df2c999f7
commit 96b70641b9
1 changed files with 16 additions and 12 deletions
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28
drivers/gpio/gpio-pca953x.c
View file

@ -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;
}