diff options
author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2016-09-09 11:17:34 +0200 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2016-09-12 14:45:34 +0200 |
commit | 53661f3bc64a3203efad5daa6cf4c4e87c53b394 (patch) | |
tree | 80ac9f16c18ea7e74d3c0235b691e29385e42b20 /drivers/gpio | |
parent | 14bf873e5921fd414cf6f0b31b799eeabd27dd74 (diff) | |
download | linux-53661f3bc64a3203efad5daa6cf4c4e87c53b394.tar.bz2 |
gpio: pca953x: code shrink
There are multiple places in the driver code where a
switch (chip->chip_type) is used to determine the proper register
offset.
Unduplicate the code by adding a simple structure holding the possible
offsets that differ between the pca953x and pca957x chip families and
use it to avoid the checks.
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.c | 133 |
1 files changed, 48 insertions, 85 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index b9d31d737dbf..5d65c9e8af25 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -95,6 +95,24 @@ MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids); #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ) +struct pca953x_reg_config { + int direction; + int output; + int input; +}; + +static const struct pca953x_reg_config pca953x_regs = { + .direction = PCA953X_DIRECTION, + .output = PCA953X_OUTPUT, + .input = PCA953X_INPUT, +}; + +static const struct pca953x_reg_config pca957x_regs = { + .direction = PCA957X_CFG, + .output = PCA957X_OUT, + .input = PCA957X_IN, +}; + struct pca953x_chip { unsigned gpio_start; u8 reg_output[MAX_BANK]; @@ -115,6 +133,8 @@ struct pca953x_chip { int chip_type; unsigned long driver_data; struct regulator *regulator; + + const struct pca953x_reg_config *regs; }; static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val, @@ -224,20 +244,12 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) { struct pca953x_chip *chip = gpiochip_get_data(gc); u8 reg_val; - int ret, offset = 0; + int ret; mutex_lock(&chip->i2c_lock); reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ)); - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_DIRECTION; - break; - case PCA957X_TYPE: - offset = PCA957X_CFG; - break; - } - ret = pca953x_write_single(chip, offset, reg_val, off); + ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off); if (ret) goto exit; @@ -252,7 +264,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc, { struct pca953x_chip *chip = gpiochip_get_data(gc); u8 reg_val; - int ret, offset = 0; + int ret; mutex_lock(&chip->i2c_lock); /* set output level */ @@ -263,15 +275,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc, reg_val = chip->reg_output[off / BANK_SZ] & ~(1u << (off % BANK_SZ)); - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_OUTPUT; - break; - case PCA957X_TYPE: - offset = PCA957X_OUT; - break; - } - ret = pca953x_write_single(chip, offset, reg_val, off); + ret = pca953x_write_single(chip, chip->regs->output, reg_val, off); if (ret) goto exit; @@ -279,15 +283,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc, /* then direction */ reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ)); - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_DIRECTION; - break; - case PCA957X_TYPE: - offset = PCA957X_CFG; - break; - } - ret = pca953x_write_single(chip, offset, reg_val, off); + ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off); if (ret) goto exit; @@ -301,18 +297,10 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) { struct pca953x_chip *chip = gpiochip_get_data(gc); u32 reg_val; - int ret, offset = 0; + int ret; mutex_lock(&chip->i2c_lock); - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_INPUT; - break; - case PCA957X_TYPE: - offset = PCA957X_IN; - break; - } - ret = pca953x_read_single(chip, offset, ®_val, off); + ret = pca953x_read_single(chip, chip->regs->input, ®_val, off); mutex_unlock(&chip->i2c_lock); if (ret < 0) { /* NOTE: diagnostic already emitted; that's all we should @@ -329,7 +317,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) { struct pca953x_chip *chip = gpiochip_get_data(gc); u8 reg_val; - int ret, offset = 0; + int ret; mutex_lock(&chip->i2c_lock); if (val) @@ -339,15 +327,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) reg_val = chip->reg_output[off / BANK_SZ] & ~(1u << (off % BANK_SZ)); - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_OUTPUT; - break; - case PCA957X_TYPE: - offset = PCA957X_OUT; - break; - } - ret = pca953x_write_single(chip, offset, reg_val, off); + ret = pca953x_write_single(chip, chip->regs->output, reg_val, off); if (ret) goto exit; @@ -361,19 +341,10 @@ static void pca953x_gpio_set_multiple(struct gpio_chip *gc, { struct pca953x_chip *chip = gpiochip_get_data(gc); u8 reg_val[MAX_BANK]; - int ret, offset = 0; + int ret; int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); int bank; - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_OUTPUT; - break; - case PCA957X_TYPE: - offset = PCA957X_OUT; - break; - } - memcpy(reg_val, chip->reg_output, NBANK(chip)); mutex_lock(&chip->i2c_lock); for(bank=0; bank<NBANK(chip); bank++) { @@ -385,7 +356,9 @@ static void pca953x_gpio_set_multiple(struct gpio_chip *gc, reg_val[bank] = (reg_val[bank] & ~bankmask) | bankval; } } - ret = i2c_smbus_write_i2c_block_data(chip->client, offset << bank_shift, NBANK(chip), reg_val); + ret = i2c_smbus_write_i2c_block_data(chip->client, + chip->regs->output << bank_shift, + NBANK(chip), reg_val); if (ret) goto exit; @@ -517,7 +490,7 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending) bool pending_seen = false; bool trigger_seen = false; u8 trigger[MAX_BANK]; - int ret, i, offset = 0; + int ret, i; if (chip->driver_data & PCA_PCAL) { /* Read the current interrupt status from the device */ @@ -542,15 +515,7 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending) return pending_seen; } - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_INPUT; - break; - case PCA957X_TYPE: - offset = PCA957X_IN; - break; - } - ret = pca953x_read_regs(chip, offset, cur_stat); + ret = pca953x_read_regs(chip, chip->regs->input, cur_stat); if (ret) return false; @@ -610,20 +575,13 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base) { struct i2c_client *client = chip->client; - int ret, i, offset = 0; + int ret, i; if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT)) { - switch (chip->chip_type) { - case PCA953X_TYPE: - offset = PCA953X_INPUT; - break; - case PCA957X_TYPE: - offset = PCA957X_IN; - break; - } - ret = pca953x_read_regs(chip, offset, chip->irq_stat); + ret = pca953x_read_regs(chip, + chip->regs->input, chip->irq_stat); if (ret) return ret; @@ -686,12 +644,14 @@ static int device_pca953x_init(struct pca953x_chip *chip, u32 invert) int ret; u8 val[MAX_BANK]; - ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output); + chip->regs = &pca953x_regs; + + ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output); if (ret) goto out; - ret = pca953x_read_regs(chip, PCA953X_DIRECTION, - chip->reg_direction); + ret = pca953x_read_regs(chip, chip->regs->direction, + chip->reg_direction); if (ret) goto out; @@ -711,10 +671,13 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert) int ret; u8 val[MAX_BANK]; - ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output); + chip->regs = &pca957x_regs; + + ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output); if (ret) goto out; - ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction); + ret = pca953x_read_regs(chip, chip->regs->direction, + chip->reg_direction); if (ret) goto out; |