diff options
| author | Milo(Woogyom) Kim <milo.kim@ti.com> | 2013-02-05 13:09:56 +0400 |
|---|---|---|
| committer | Bryan Wu <cooloney@gmail.com> | 2013-02-07 03:59:27 +0400 |
| commit | e3a700d8aae190e09fb06abe0ddd2e172a682508 (patch) | |
| tree | 3cc952ab61cfb1219f2a43a5e0e738dd2fd7ae10 /drivers/leds/leds-lp55xx-common.c | |
| parent | 48068d5de16c23c256c085b2cd3ff03bec393900 (diff) | |
| download | linux-e3a700d8aae190e09fb06abe0ddd2e172a682508.tar.xz | |
leds-lp55xx: use lp55xx common init function - detect
LP5521/5523 chip detection functions are replaced with lp55xx common function,
lp55xx_detect_device().
Chip dependent address and values are configurable in each driver.
In init function, chip detection is executed.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds/leds-lp55xx-common.c')
| -rw-r--r-- | drivers/leds/leds-lp55xx-common.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c index bbf2bbf03807..6fede0b96715 100644 --- a/drivers/leds/leds-lp55xx-common.c +++ b/drivers/leds/leds-lp55xx-common.c @@ -30,6 +30,29 @@ static void lp55xx_reset_device(struct lp55xx_chip *chip) lp55xx_write(chip, addr, val); } +static int lp55xx_detect_device(struct lp55xx_chip *chip) +{ + struct lp55xx_device_config *cfg = chip->cfg; + u8 addr = cfg->enable.addr; + u8 val = cfg->enable.val; + int ret; + + ret = lp55xx_write(chip, addr, val); + if (ret) + return ret; + + usleep_range(1000, 2000); + + ret = lp55xx_read(chip, addr, &val); + if (ret) + return ret; + + if (val != cfg->enable.val) + return -ENODEV; + + return 0; +} + int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) { return i2c_smbus_write_byte_data(chip->cl, reg, val); @@ -103,6 +126,12 @@ int lp55xx_init_device(struct lp55xx_chip *chip) */ usleep_range(10000, 20000); + ret = lp55xx_detect_device(chip); + if (ret) { + dev_err(dev, "device detection err: %d\n", ret); + goto err; + } + err: return ret; } |