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gpio: pca953x: Rewrite ->get_multiple() function

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The commit 96d7c7b3e6 ("gpio: gpio-pca953x, Add get_multiple function")
basically did everything wrong from style and code reuse perspective, i.e.
- it didn't utilize existing PCA953x internal helpers
- it didn't utilize bitmap API
- it misses the point that ilog2(), besides that BANK_SFT is useless,
  can be used in macros
- it has indentation issues.

Rewrite the function completely.

Cc: Paul Thomas <pthomas8589@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Andy Shevchenko 2020-04-20 20:27:50 +03:00 committed by Bartosz Golaszewski
parent 9784c9963f
commit 6f793485fc
1 changed files with 11 additions and 30 deletions
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41
drivers/gpio/gpio-pca953x.c
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@ -115,7 +115,6 @@ MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
#define MAX_BANK 5
#define BANK_SZ 8
#define BANK_SFT 3 /* ilog2(BANK_SZ) */
#define MAX_LINE (MAX_BANK * BANK_SZ)
#define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
@ -469,38 +468,20 @@ static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
}
static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
unsigned long *mask, unsigned long *bits)
{
struct pca953x_chip *chip = gpiochip_get_data(gc);
unsigned int reg_val;
int offset, value, i, ret = 0;
u8 inreg;
DECLARE_BITMAP(reg_val, MAX_LINE);
int ret;
/* Force offset outside the range of i so that
* at least the first relevant register is read
*/
offset = gc->ngpio;
for_each_set_bit(i, mask, gc->ngpio) {
/* whenever i goes into a new bank update inreg
* and read the register
*/
if ((offset >> BANK_SFT) != (i >> BANK_SFT)) {
offset = i;
inreg = pca953x_recalc_addr(chip, chip->regs->input,
offset, true, false);
mutex_lock(&chip->i2c_lock);
ret = regmap_read(chip->regmap, inreg, &reg_val);
mutex_unlock(&chip->i2c_lock);
if (ret < 0)
return ret;
}
/* reg_val is relative to the last read byte,
* so only shift the relative bits
*/
value = (reg_val >> (i % 8)) & 0x01;
__assign_bit(i, bits, value);
}
return ret;
mutex_lock(&chip->i2c_lock);
ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
mutex_unlock(&chip->i2c_lock);
if (ret)
return ret;
bitmap_replace(bits, bits, reg_val, mask, gc->ngpio);
return 0;
}
static void pca953x_gpio_set_multiple(struct gpio_chip *gc,