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authorMilo(Woogyom) Kim <milo.kim@ti.com>2013-02-05 17:49:46 +0900
committerBryan Wu <cooloney@gmail.com>2013-02-06 15:59:25 -0800
commit944f7b1dedb859f76a88c8d34ce23a90bf6285a0 (patch)
treeba55b8a43e9f1077abe7df911292ab9ef43dcf73 /drivers/leds/leds-lp5521.c
parent8a4529a38d38f53657769b942f6fc5d34f2c64b5 (diff)
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leds-lp55xx: clean up init_device() in lp5521/5523
To make _probe() simple, device initialization code is moved to _init_device() at each driver. This patch is a preceding step for lp55xx common driver architecture. leds-lp5521: When 'lp5521_init_device()' gets failed, error handling should be 'fail1' rather than 'fail2'. fail1: releasing platform resource and return code fail2: releasing allocated LED devices with handling 'fail1' The 'lp5521_init_device()' is called before creating LED devices. Thus, 'goto fail1' is proper error handler of this function. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds/leds-lp5521.c')
-rw-r--r--drivers/leds/leds-lp5521.c102
1 files changed, 56 insertions, 46 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index cb8a5220200b..24f439f78bd8 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -687,6 +687,59 @@ static void lp5521_unregister_sysfs(struct i2c_client *client)
&lp5521_led_attribute_group);
}
+static int lp5521_init_device(struct lp5521_chip *chip)
+{
+ struct lp5521_platform_data *pdata = chip->pdata;
+ struct i2c_client *client = chip->client;
+ int ret;
+ u8 buf;
+
+ if (pdata->setup_resources) {
+ ret = pdata->setup_resources();
+ if (ret < 0)
+ return ret;
+ }
+
+ if (pdata->enable) {
+ pdata->enable(0);
+ usleep_range(1000, 2000); /* Keep enable down at least 1ms */
+ pdata->enable(1);
+ usleep_range(1000, 2000); /* 500us abs min. */
+ }
+
+ lp5521_write(client, LP5521_REG_RESET, 0xff);
+ usleep_range(10000, 20000); /*
+ * Exact value is not available. 10 - 20ms
+ * appears to be enough for reset.
+ */
+
+ /*
+ * Make sure that the chip is reset by reading back the r channel
+ * current reg. This is dummy read is required on some platforms -
+ * otherwise further access to the R G B channels in the
+ * LP5521_REG_ENABLE register will not have any effect - strange!
+ */
+ ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
+ if (ret) {
+ dev_err(&client->dev, "error in resetting chip\n");
+ return ret;
+ }
+ if (buf != LP5521_REG_R_CURR_DEFAULT) {
+ dev_err(&client->dev,
+ "unexpected data in register (expected 0x%x got 0x%x)\n",
+ LP5521_REG_R_CURR_DEFAULT, buf);
+ ret = -EINVAL;
+ return ret;
+ }
+ usleep_range(10000, 20000);
+
+ ret = lp5521_detect(client);
+ if (ret)
+ dev_err(&client->dev, "Chip not found\n");
+
+ return ret;
+}
+
static int lp5521_init_led(struct lp5521_led *led,
struct i2c_client *client,
int chan, struct lp5521_platform_data *pdata)
@@ -742,7 +795,6 @@ static int lp5521_probe(struct i2c_client *client,
struct lp5521_chip *chip;
struct lp5521_platform_data *pdata;
int ret, i, led;
- u8 buf;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
@@ -762,51 +814,9 @@ static int lp5521_probe(struct i2c_client *client,
chip->pdata = pdata;
- if (pdata->setup_resources) {
- ret = pdata->setup_resources();
- if (ret < 0)
- return ret;
- }
-
- if (pdata->enable) {
- pdata->enable(0);
- usleep_range(1000, 2000); /* Keep enable down at least 1ms */
- pdata->enable(1);
- usleep_range(1000, 2000); /* 500us abs min. */
- }
-
- lp5521_write(client, LP5521_REG_RESET, 0xff);
- usleep_range(10000, 20000); /*
- * Exact value is not available. 10 - 20ms
- * appears to be enough for reset.
- */
-
- /*
- * Make sure that the chip is reset by reading back the r channel
- * current reg. This is dummy read is required on some platforms -
- * otherwise further access to the R G B channels in the
- * LP5521_REG_ENABLE register will not have any effect - strange!
- */
- ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
- if (ret) {
- dev_err(&client->dev, "error in resetting chip\n");
- goto fail2;
- }
- if (buf != LP5521_REG_R_CURR_DEFAULT) {
- dev_err(&client->dev,
- "unexpected data in register (expected 0x%x got 0x%x)\n",
- LP5521_REG_R_CURR_DEFAULT, buf);
- ret = -EINVAL;
- goto fail2;
- }
- usleep_range(10000, 20000);
-
- ret = lp5521_detect(client);
-
- if (ret) {
- dev_err(&client->dev, "Chip not found\n");
- goto fail2;
- }
+ ret = lp5521_init_device(chip);
+ if (ret)
+ goto fail1;
dev_info(&client->dev, "%s programmable led chip found\n", id->name);