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Date: Wed, 13 Jun 2012 21:58:08 -0700 (PDT)
From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To: Linus Walleij <linus.walleij@...ricsson.com>,
Grant Likely <grant.likely@...retlab.ca>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2][resend] gpio: pcf857x: share 8/16 bit access functions
This patch adds 8/16 bit write/read functions,
and shared gpio input/output/set/get functions.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
drivers/gpio/gpio-pcf857x.c | 93 ++++++++++++++----------------------------
1 files changed, 31 insertions(+), 62 deletions(-)
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 2d1de9e..076e236 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -61,61 +61,28 @@ struct pcf857x {
struct i2c_client *client;
struct mutex lock; /* protect 'out' */
unsigned out; /* software latch */
+
+ int (*write)(struct i2c_client *client, unsigned data);
+ int (*read)(struct i2c_client *client);
};
/*-------------------------------------------------------------------------*/
/* Talk to 8-bit I/O expander */
-static int pcf857x_input8(struct gpio_chip *chip, unsigned offset)
-{
- struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
- int status;
-
- mutex_lock(&gpio->lock);
- gpio->out |= (1 << offset);
- status = i2c_smbus_write_byte(gpio->client, gpio->out);
- mutex_unlock(&gpio->lock);
-
- return status;
-}
-
-static int pcf857x_get8(struct gpio_chip *chip, unsigned offset)
-{
- struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
- s32 value;
-
- value = i2c_smbus_read_byte(gpio->client);
- return (value < 0) ? 0 : (value & (1 << offset));
-}
-
-static int pcf857x_output8(struct gpio_chip *chip, unsigned offset, int value)
+static int i2c_write_le8(struct i2c_client *client, unsigned data)
{
- struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
- unsigned bit = 1 << offset;
- int status;
-
- mutex_lock(&gpio->lock);
- if (value)
- gpio->out |= bit;
- else
- gpio->out &= ~bit;
- status = i2c_smbus_write_byte(gpio->client, gpio->out);
- mutex_unlock(&gpio->lock);
-
- return status;
+ return i2c_smbus_write_byte(client, data);
}
-static void pcf857x_set8(struct gpio_chip *chip, unsigned offset, int value)
+static int i2c_read_le8(struct i2c_client *client)
{
- pcf857x_output8(chip, offset, value);
+ return (int)i2c_smbus_read_byte(client);
}
-/*-------------------------------------------------------------------------*/
-
/* Talk to 16-bit I/O expander */
-static int i2c_write_le16(struct i2c_client *client, u16 word)
+static int i2c_write_le16(struct i2c_client *client, unsigned word)
{
u8 buf[2] = { word & 0xff, word >> 8, };
int status;
@@ -135,29 +102,31 @@ static int i2c_read_le16(struct i2c_client *client)
return (buf[1] << 8) | buf[0];
}
-static int pcf857x_input16(struct gpio_chip *chip, unsigned offset)
+/*-------------------------------------------------------------------------*/
+
+static int pcf857x_input(struct gpio_chip *chip, unsigned offset)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
int status;
mutex_lock(&gpio->lock);
gpio->out |= (1 << offset);
- status = i2c_write_le16(gpio->client, gpio->out);
+ status = gpio->write(gpio->client, gpio->out);
mutex_unlock(&gpio->lock);
return status;
}
-static int pcf857x_get16(struct gpio_chip *chip, unsigned offset)
+static int pcf857x_get(struct gpio_chip *chip, unsigned offset)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
int value;
- value = i2c_read_le16(gpio->client);
+ value = gpio->read(gpio->client);
return (value < 0) ? 0 : (value & (1 << offset));
}
-static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value)
+static int pcf857x_output(struct gpio_chip *chip, unsigned offset, int value)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
unsigned bit = 1 << offset;
@@ -168,15 +137,15 @@ static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value)
gpio->out |= bit;
else
gpio->out &= ~bit;
- status = i2c_write_le16(gpio->client, gpio->out);
+ status = gpio->write(gpio->client, gpio->out);
mutex_unlock(&gpio->lock);
return status;
}
-static void pcf857x_set16(struct gpio_chip *chip, unsigned offset, int value)
+static void pcf857x_set(struct gpio_chip *chip, unsigned offset, int value)
{
- pcf857x_output16(chip, offset, value);
+ pcf857x_output(chip, offset, value);
}
/*-------------------------------------------------------------------------*/
@@ -200,10 +169,15 @@ static int pcf857x_probe(struct i2c_client *client,
mutex_init(&gpio->lock);
- gpio->chip.base = pdata ? pdata->gpio_base : -1;
- gpio->chip.can_sleep = 1;
- gpio->chip.dev = &client->dev;
- gpio->chip.owner = THIS_MODULE;
+ gpio->chip.base = pdata ? pdata->gpio_base : -1;
+ gpio->chip.can_sleep = 1;
+ gpio->chip.dev = &client->dev;
+ gpio->chip.owner = THIS_MODULE;
+ gpio->chip.get = pcf857x_get;
+ gpio->chip.set = pcf857x_set;
+ gpio->chip.direction_input = pcf857x_input;
+ gpio->chip.direction_output = pcf857x_output;
+ gpio->chip.ngpio = id->driver_data;
/* NOTE: the OnSemi jlc1562b is also largely compatible with
* these parts, notably for output. It has a low-resolution
@@ -216,12 +190,9 @@ static int pcf857x_probe(struct i2c_client *client,
*
* NOTE: we don't distinguish here between *4 and *4a parts.
*/
- gpio->chip.ngpio = id->driver_data;
if (gpio->chip.ngpio == 8) {
- gpio->chip.direction_input = pcf857x_input8;
- gpio->chip.get = pcf857x_get8;
- gpio->chip.direction_output = pcf857x_output8;
- gpio->chip.set = pcf857x_set8;
+ gpio->write = i2c_write_le8;
+ gpio->read = i2c_read_le8;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE))
@@ -238,10 +209,8 @@ static int pcf857x_probe(struct i2c_client *client,
* NOTE: we don't distinguish here between '75 and '75c parts.
*/
} else if (gpio->chip.ngpio == 16) {
- gpio->chip.direction_input = pcf857x_input16;
- gpio->chip.get = pcf857x_get16;
- gpio->chip.direction_output = pcf857x_output16;
- gpio->chip.set = pcf857x_set16;
+ gpio->write = i2c_write_le16;
+ gpio->read = i2c_read_le16;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
status = -EIO;
--
1.7.5.4
--
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