On 13/03/13 14:15, Linus Walleij wrote:
Sorry for slow replies :-(
On Thu, Mar 7, 2013 at 2:17 PM, Ian Lartey <ian@xxxxxxxxxxxxxxx> wrote:
+static int palmas_gpio_read(struct palmas *palmas, unsigned int reg,
+ int gpio, unsigned int *dest)
I don't like "int gpio" here, please use "int offset".
This is not a global GPIO number, it is an offset in the local gpio_chip,
right?
Correct.
+{
+ /* registers for second bank are identical and offset by 0x9 */
+ if (gpio > 7)
+ reg += PALMAS_GPIO_DATA_IN2;
+
+ return palmas_read(palmas, PALMAS_GPIO_BASE, reg, dest);
+}
+
+static int palmas_gpio_write(struct palmas *palmas, unsigned int reg,
+ int gpio, unsigned int data)
+{
+ /* registers for second bank are identical and offset by 0x9 */
+ if (gpio > 7)
+ reg += PALMAS_GPIO_DATA_IN2;
+
+ return palmas_write(palmas, PALMAS_GPIO_BASE, reg, data);
+}
+
+static int palmas_gpio_update_bits(struct palmas *palmas, unsigned int reg,
+ int gpio, unsigned int mask, unsigned int data)
+{
+ /* registers for second bank are identical and offset by 0x9 */
+ if (gpio > 7)
+ reg += PALMAS_GPIO_DATA_IN2;
+
+ return palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, mask, data);
+}
- ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_IN, &val);
+ ret = palmas_gpio_read(palmas, PALMAS_GPIO_DATA_IN, offset, &val);
(Obviously you are passing the offset.)
+ ret = palmas_gpio_write(palmas, PALMAS_GPIO_SET_DATA_OUT,
+ offset, BIT(offset % 8));
(..)
+ ret = palmas_gpio_write(palmas, PALMAS_GPIO_CLEAR_DATA_OUT,
+ offset, BIT(offset % 8));
(...)
+ ret = palmas_gpio_update_bits(palmas, PALMAS_GPIO_DATA_DIR,
+ offset, 1 << (offset % 8), 1 << (offset % 8));
Why aren't you using the BIT() macro here too?
Further: if these functions are always used like this, with offset
and some BIT() or (1 << (offset % 8)) why don't you move that
latter part into the static helper and just pass offset into the
helper?
Good points - I missed the other bit shifts.
Yours,
Linus Walleij
Thanks
Ian
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
