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| author | Axel Lin <axel.lin@ingics.com> | 2014-04-15 10:15:27 +0800 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-04-28 12:35:09 -0700 |
| commit | 7e9fcc9d62626c752e38d5eeb78687d006fc24cf (patch) | |
| tree | c8f52d668e46d26145cacc2a52def7f1c72b1118 /drivers/gpio/gpio-sch311x.c | |
| parent | f604cf0919b806bdedef5f53dd1f43796166997c (diff) | |
| download | linux-7e9fcc9d62626c752e38d5eeb78687d006fc24cf.tar.gz linux-7e9fcc9d62626c752e38d5eeb78687d006fc24cf.tar.bz2 linux-7e9fcc9d62626c752e38d5eeb78687d006fc24cf.zip | |
gpio: sch311x: Slightly refactor sch311x_detect for better readability
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-sch311x.c')
| -rw-r--r-- | drivers/gpio/gpio-sch311x.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/gpio/gpio-sch311x.c b/drivers/gpio/gpio-sch311x.c index 0357387b3645..f942b80ee403 100644 --- a/drivers/gpio/gpio-sch311x.c +++ b/drivers/gpio/gpio-sch311x.c @@ -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); |