From 87d931d56970d014a7074ca57f11baadc4e6d834 Mon Sep 17 00:00:00 2001 From: Milo Kim Date: Tue, 25 Aug 2015 15:07:07 +0900 Subject: [PATCH] power:lp8727_charger: use the private data instead of updating I2C device platform data Currently, lp8727 charger driver parses the DT and copies values into the 'cl->dev.platform_data' if 'of_node' exists. This may have architectural issue. Platform data is configurable through the DT or I2C board info inside the platform area. However, lp8727 driver changes this configuration when it is loaded. The driver should get data from the platform side and use the private data, 'lp8727_chg->pdata' instead of changing the original platform data. _probe() procedure is changed as follows. 1. lp8727_parse_dt() returns the pointer of lp8727_platform_data. The driver uses this allocated platform data. So it should keep original platform data, 'dev->platform_data'. 2. In _probe(), check the return value of lp8727_parse_dt(). If an error is found, then exit as PTR_ERR(pdata). 3. If 'of_node' is not found, then the driver just gets the platform data from the I2C device structure. 4. Map the platform data to private data structure. Cc: Dmitry Eremin-Solenikov Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Milo Kim Signed-off-by: Sebastian Reichel --- drivers/power/lp8727_charger.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c index 7e741f1d3cd5..30dc265435ee 100644 --- a/drivers/power/lp8727_charger.c +++ b/drivers/power/lp8727_charger.c @@ -508,7 +508,7 @@ out: return param; } -static int lp8727_parse_dt(struct device *dev) +static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev) { struct device_node *np = dev->of_node; struct device_node *child; @@ -517,11 +517,11 @@ static int lp8727_parse_dt(struct device *dev) /* If charging parameter is not defined, just skip parsing the dt */ if (of_get_child_count(np) == 0) - goto out; + return NULL; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) - return -ENOMEM; + return ERR_PTR(-ENOMEM); of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec); @@ -535,29 +535,30 @@ static int lp8727_parse_dt(struct device *dev) pdata->usb = lp8727_parse_charge_pdata(dev, child); } - dev->platform_data = pdata; -out: - return 0; + return pdata; } #else -static int lp8727_parse_dt(struct device *dev) +static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev) { - return 0; + return NULL; } #endif static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id) { struct lp8727_chg *pchg; + struct lp8727_platform_data *pdata; int ret; if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) return -EIO; if (cl->dev.of_node) { - ret = lp8727_parse_dt(&cl->dev); - if (ret) - return ret; + pdata = lp8727_parse_dt(&cl->dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } else { + pdata = dev_get_platdata(&cl->dev); } pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL); @@ -566,7 +567,7 @@ static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id) pchg->client = cl; pchg->dev = &cl->dev; - pchg->pdata = cl->dev.platform_data; + pchg->pdata = pdata; i2c_set_clientdata(cl, pchg); mutex_init(&pchg->xfer_lock); -- 2.20.1