Commit ab5dc372 authored by David Brownell's avatar David Brownell Committed by Linus Torvalds

gpio: pca953x handles more chips, i2c fault codes

Minor updates to the pca953x GPIO expander driver: handle several more
compatible parts, and stop assuming that the I2C layer's return codes are
garbage (that's now been fixed).
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Eric Miao <eric.miao@marvell.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent cabb3fc4
......@@ -95,7 +95,7 @@ config GPIO_MAX732X
number for these GPIOs.
config GPIO_PCA953X
tristate "PCA953x, PCA955x, and MAX7310 I/O ports"
tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
depends on I2C
help
Say yes here to provide access to several register-oriented
......@@ -104,9 +104,10 @@ config GPIO_PCA953X
4 bits: pca9536, pca9537
8 bits: max7310, pca9534, pca9538, pca9554, pca9557
8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
tca6408
16 bits: pca9535, pca9539, pca9555
16 bits: pca9535, pca9539, pca9555, tca6416
This driver can also be built as a module. If so, the module
will be called pca953x.
......
......@@ -33,7 +33,12 @@ static const struct i2c_device_id pca953x_id[] = {
{ "pca9554", 8, },
{ "pca9555", 16, },
{ "pca9557", 8, },
{ "max7310", 8, },
{ "pca6107", 8, },
{ "tca6408", 8, },
{ "tca6416", 16, },
/* NYET: { "tca6424", 24, }, */
{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);
......@@ -47,9 +52,6 @@ struct pca953x_chip {
struct gpio_chip gpio_chip;
};
/* NOTE: we can't currently rely on fault codes to come from SMBus
* calls, so we map all errors to EIO here and return zero otherwise.
*/
static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
{
int ret;
......@@ -61,7 +63,7 @@ static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
if (ret < 0) {
dev_err(&chip->client->dev, "failed writing register\n");
return -EIO;
return ret;
}
return 0;
......@@ -78,7 +80,7 @@ static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
if (ret < 0) {
dev_err(&chip->client->dev, "failed reading register\n");
return -EIO;
return ret;
}
*val = (uint16_t)ret;
......
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