From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 20 Apr 2020 20:27:50 +0300
Subject: gpio: pca953x: Rewrite ->get_multiple() function
Git-commit: 6f793485fc03fe832e1abcf0682efd7b4419ae2d
Patch-mainline: v5.8-rc1
References: jsc#SLE-15847
The commit 96d7c7b3e654 ("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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/gpio/gpio-pca953x.c | 41 ++++++++++---------------------------
1 file changed, 11 insertions(+), 30 deletions(-)
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 60ae18e4b5f5..41be681ae77c 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -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, ®_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,
--
2.26.2