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Revert "gpio: lp3943: Drop pin_used and lp3943_gpio_request/lp3943_gpio_free"

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This reverts commit 3fab91ea28.
This commit is contained in:
Linus Walleij 2016-03-09 22:00:27 +07:00
parent 7b1e5dc86c
commit 70aba44b6c
2 changed files with 28 additions and 0 deletions
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22
drivers/gpio/gpio-lp3943.c
View File

@ -45,6 +45,26 @@ struct lp3943_gpio {
u16 input_mask; /* 1 = GPIO is input direction, 0 = output */
};
static int lp3943_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct lp3943_gpio *lp3943_gpio = gpiochip_get_data(chip);
struct lp3943 *lp3943 = lp3943_gpio->lp3943;
/* Return an error if the pin is already assigned */
if (test_and_set_bit(offset, &lp3943->pin_used))
return -EBUSY;
return 0;
}
static void lp3943_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct lp3943_gpio *lp3943_gpio = gpiochip_get_data(chip);
struct lp3943 *lp3943 = lp3943_gpio->lp3943;
clear_bit(offset, &lp3943->pin_used);
}
static int lp3943_gpio_set_mode(struct lp3943_gpio *lp3943_gpio, u8 offset,
u8 val)
{
@ -157,6 +177,8 @@ static int lp3943_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
static const struct gpio_chip lp3943_gpio_chip = {
.label = "lp3943",
.owner = THIS_MODULE,
.request = lp3943_gpio_request,
.free = lp3943_gpio_free,
.direction_input = lp3943_gpio_direction_input,
.get = lp3943_gpio_get,
.direction_output = lp3943_gpio_direction_output,

6
include/linux/mfd/lp3943.h
View File

@ -94,12 +94,18 @@ struct lp3943_reg_cfg {
* @regmap: Used for I2C communication on accessing registers
* @pdata: LP3943 platform specific data
* @mux_cfg: Register configuration for pin MUX
* @pin_used: Bit mask for output pin used.
* This bitmask is used for pin assignment management.
* 1 = pin used, 0 = available.
* Only LSB 16 bits are used, but it is unsigned long type
* for atomic bitwise operations.
*/
struct lp3943 {
struct device *dev;
struct regmap *regmap;
struct lp3943_platform_data *pdata;
const struct lp3943_reg_cfg *mux_cfg;
unsigned long pin_used;
};
int lp3943_read_byte(struct lp3943 *lp3943, u8 reg, u8 *read);