[<prev] [next>] [day] [month] [year] [list]
Message-Id: <200812031329.04914.david-b@pacbell.net>
Date: Wed, 3 Dec 2008 13:29:04 -0800
From: David Brownell <david-b@...bell.net>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Eric Miao <eric.y.miao@...il.com>,
lkml <linux-kernel@...r.kernel.org>
Subject: [patch 2.6.28-rc7] gpio: pca953x handles more chips, i2c fault codes
From: David Brownell <dbrownell@...rs.sourceforge.net>
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@...rs.sourceforge.net>
Cc: Eric Miao <eric.miao@...vell.com>
---
drivers/gpio/Kconfig | 7 ++++---
drivers/gpio/pca953x.c | 12 +++++++-----
2 files changed, 11 insertions(+), 8 deletions(-)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -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.
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -33,7 +33,12 @@ static const struct i2c_device_id pca953
{ "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 pca9
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 pca95
if (ret < 0) {
dev_err(&chip->client->dev, "failed reading register\n");
- return -EIO;
+ return ret;
}
*val = (uint16_t)ret;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists