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gpio: sch311x: Slightly refactor sch311x_detect for better readability

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Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Axel Lin 2014-04-15 10:15:27 +08:00 committed by Linus Walleij
parent f604cf0919
commit 7e9fcc9d62
1 changed files with 12 additions and 4 deletions
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16
drivers/gpio/gpio-sch311x.c
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@ -327,14 +327,22 @@ static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
if (err)
return err;
/* Check device ID. We currently know about:
* SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
/* Check device ID. */
reg = sch311x_sio_inb(sio_config_port, 0x20);
if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
switch (reg) {
case 0x7c: /* SCH3112 */
dev_id = 2;
break;
case 0x7d: /* SCH3114 */
dev_id = 4;
break;
case 0x7f: /* SCH3116 */
dev_id = 6;
break;
default:
err = -ENODEV;
goto exit;
}
dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
/* Select logical device A (runtime registers) */
sch311x_sio_outb(sio_config_port, 0x07, 0x0a);