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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: David Brownell <dbrownell@users.sourceforge.net>
Cc: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Brownell 2009-01-06 14:42:27 -08:00 committed by Linus Torvalds
parent cabb3fc4bd
commit ab5dc37202
2 changed files with 11 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpio/Kconfig
View File

@ -95,7 +95,7 @@ config GPIO_MAX732X
number for these GPIOs. number for these GPIOs.
config GPIO_PCA953X config GPIO_PCA953X
tristate "PCA953x, PCA955x, and MAX7310 I/O ports" tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
depends on I2C depends on I2C
help help
Say yes here to provide access to several register-oriented Say yes here to provide access to several register-oriented
@ -104,9 +104,10 @@ config GPIO_PCA953X
4 bits: pca9536, pca9537 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 This driver can also be built as a module. If so, the module
will be called pca953x. will be called pca953x.

12
drivers/gpio/pca953x.c
View File

@ -33,7 +33,12 @@ static const struct i2c_device_id pca953x_id[] = {
{ "pca9554", 8, }, { "pca9554", 8, },
{ "pca9555", 16, }, { "pca9555", 16, },
{ "pca9557", 8, }, { "pca9557", 8, },
{ "max7310", 8, }, { "max7310", 8, },
{ "pca6107", 8, },
{ "tca6408", 8, },
{ "tca6416", 16, },
/* NYET: { "tca6424", 24, }, */
{ } { }
}; };
MODULE_DEVICE_TABLE(i2c, pca953x_id); MODULE_DEVICE_TABLE(i2c, pca953x_id);
@ -47,9 +52,6 @@ struct pca953x_chip {
struct gpio_chip gpio_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) static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
{ {
int ret; int ret;
@ -61,7 +63,7 @@ static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
if (ret < 0) { if (ret < 0) {
dev_err(&chip->client->dev, "failed writing register\n"); dev_err(&chip->client->dev, "failed writing register\n");
return -EIO; return ret;
} }
return 0; return 0;
@ -78,7 +80,7 @@ static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
if (ret < 0) { if (ret < 0) {
dev_err(&chip->client->dev, "failed reading register\n"); dev_err(&chip->client->dev, "failed reading register\n");
return -EIO; return ret;
} }
*val = (uint16_t)ret; *val = (uint16_t)ret;