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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2016-09-09 12:17:36 +0300
committerLinus Walleij <linus.walleij@linaro.org>2016-09-12 15:46:54 +0300
commitc6e3cf01d31d88d35a8fbf8bf4773b737fa48f21 (patch)
treefd9cfc12d752f33b2563fbcce7f84a61b97f5007 /drivers/gpio
parent7acc66e3711b004496c85a64534b2b8aabef8df3 (diff)
downloadlinux-c6e3cf01d31d88d35a8fbf8bf4773b737fa48f21.tar.xz
gpio: pca953x: refactor pca953x_read_regs()
Avoid the unnecessary if-else in pca953x_read_regs() by spltting the routine into smaller, specialized functions and calling the right one via a function pointer held in struct pca953x. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-pca953x.c49
1 files changed, 35 insertions, 14 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index e9defeb9c212..e7bf3b3cebcd 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -137,6 +137,7 @@ struct pca953x_chip {
const struct pca953x_reg_config *regs;
int (*write_regs)(struct pca953x_chip *, int, u8 *);
+ int (*read_regs)(struct pca953x_chip *, int, u8 *);
};
static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
@@ -222,24 +223,41 @@ static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
return 0;
}
-static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
+static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
{
int ret;
- if (chip->gpio_chip.ngpio <= 8) {
- ret = i2c_smbus_read_byte_data(chip->client, reg);
- *val = ret;
- } else if (chip->gpio_chip.ngpio >= 24) {
- int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+ ret = i2c_smbus_read_byte_data(chip->client, reg);
+ *val = ret;
- ret = i2c_smbus_read_i2c_block_data(chip->client,
- (reg << bank_shift) | REG_ADDR_AI,
- NBANK(chip), val);
- } else {
- ret = i2c_smbus_read_word_data(chip->client, reg << 1);
- val[0] = (u16)ret & 0xFF;
- val[1] = (u16)ret >> 8;
- }
+ return ret;
+}
+
+static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(chip->client, reg << 1);
+ val[0] = (u16)ret & 0xFF;
+ val[1] = (u16)ret >> 8;
+
+ return ret;
+}
+
+static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
+{
+ int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+
+ return i2c_smbus_read_i2c_block_data(chip->client,
+ (reg << bank_shift) | REG_ADDR_AI,
+ NBANK(chip), val);
+}
+
+static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
+{
+ int ret;
+
+ ret = chip->read_regs(chip, reg, val);
if (ret < 0) {
dev_err(&chip->client->dev, "failed reading register\n");
return ret;
@@ -784,13 +802,16 @@ static int pca953x_probe(struct i2c_client *client,
if (chip->gpio_chip.ngpio <= 8) {
chip->write_regs = pca953x_write_regs_8;
+ chip->read_regs = pca953x_read_regs_8;
} else if (chip->gpio_chip.ngpio >= 24) {
chip->write_regs = pca953x_write_regs_24;
+ chip->read_regs = pca953x_read_regs_24;
} else {
if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
chip->write_regs = pca953x_write_regs_16;
else
chip->write_regs = pca957x_write_regs_16;
+ chip->read_regs = pca953x_read_regs_16;
}
if (chip->chip_type == PCA953X_TYPE)