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Date: Thu, 30 Aug 2012 11:39:38 +0000
From: "Kim, Milo" <Milo.Kim@...com>
To: Anton Vorontsov <cbouatmailru@...il.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
David Woodhouse <dwmw2@...radead.org>,
Anton Vorontsov <anton.vorontsov@...aro.org>
Subject: [PATCH 3/8] lp8727_charger: fix buggy code when the platform data
is NULL
Even the platform data is not defined, lp8727 driver should be run
(a) change charger platform data type to pointer
(b) name change: chg_parm -> chg_param
(c) fix NULL point access problem when getting the battery properties
Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>
---
drivers/power/lp8727_charger.c | 38 +++++++++++++++++++++++-----------
include/linux/platform_data/lp8727.h | 13 ++++++------
2 files changed, 33 insertions(+), 18 deletions(-)
diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c
index 4d51909..975a4f2 100644
--- a/drivers/power/lp8727_charger.c
+++ b/drivers/power/lp8727_charger.c
@@ -88,7 +88,7 @@ struct lp8727_chg {
struct workqueue_struct *irqthread;
struct lp8727_platform_data *pdata;
struct lp8727_psy *psy;
- struct lp8727_chg_param *chg_parm;
+ struct lp8727_chg_param *chg_param;
enum lp8727_dev_id devid;
};
@@ -170,20 +170,21 @@ static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
{
+ struct lp8727_platform_data *pdata = pchg->pdata;
u8 devid = ID_NONE;
u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
switch (id) {
case 0x5:
devid = ID_TA;
- pchg->chg_parm = &pchg->pdata->ac;
+ pchg->chg_param = pdata ? pdata->ac : NULL;
break;
case 0xB:
if (lp8727_is_dedicated_charger(pchg)) {
- pchg->chg_parm = &pchg->pdata->ac;
+ pchg->chg_param = pdata ? pdata->ac : NULL;
devid = ID_DEDICATED_CHG;
} else if (lp8727_is_usb_charger(pchg)) {
- pchg->chg_parm = &pchg->pdata->usb;
+ pchg->chg_param = pdata ? pdata->usb : NULL;
devid = ID_USB_CHG;
swctrl = SW_DM1_DM | SW_DP2_DP;
} else if (vbusin) {
@@ -193,7 +194,7 @@ static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
break;
default:
devid = ID_NONE;
- pchg->chg_parm = NULL;
+ pchg->chg_param = NULL;
break;
}
@@ -295,6 +296,7 @@ static int lp8727_battery_get_property(struct power_supply *psy,
union power_supply_propval *val)
{
struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
+ struct lp8727_platform_data *pdata = pchg->pdata;
u8 read;
switch (psp) {
@@ -318,19 +320,31 @@ static int lp8727_battery_get_property(struct power_supply *psy,
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_PRESENT:
- if (pchg->pdata->get_batt_present)
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_present)
val->intval = pchg->pdata->get_batt_present();
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- if (pchg->pdata->get_batt_level)
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_level)
val->intval = pchg->pdata->get_batt_level();
break;
case POWER_SUPPLY_PROP_CAPACITY:
- if (pchg->pdata->get_batt_capacity)
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_capacity)
val->intval = pchg->pdata->get_batt_capacity();
break;
case POWER_SUPPLY_PROP_TEMP:
- if (pchg->pdata->get_batt_temp)
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_temp)
val->intval = pchg->pdata->get_batt_temp();
break;
default:
@@ -347,9 +361,9 @@ static void lp8727_charger_changed(struct power_supply *psy)
u8 eoc_level, ichg;
if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
- if (pchg->chg_parm) {
- eoc_level = pchg->chg_parm->eoc_level;
- ichg = pchg->chg_parm->ichg;
+ if (pchg->chg_param) {
+ eoc_level = pchg->chg_param->eoc_level;
+ ichg = pchg->chg_param->ichg;
val = (ichg << 4) | eoc_level;
lp8727_write_byte(pchg, CHGCTRL2, val);
}
diff --git a/include/linux/platform_data/lp8727.h b/include/linux/platform_data/lp8727.h
index ea98c61..ff14591 100644
--- a/include/linux/platform_data/lp8727.h
+++ b/include/linux/platform_data/lp8727.h
@@ -47,19 +47,20 @@ struct lp8727_chg_param {
/**
* struct lp8727_platform_data
- * @get_batt_present : check battery status - exists or not
- * @get_batt_level : get battery voltage (mV)
+ * @get_batt_present : check battery status - exists or not
+ * @get_batt_level : get battery voltage (mV)
* @get_batt_capacity : get battery capacity (%)
- * @get_batt_temp : get battery temperature
- * @ac, @usb : charging parameters each charger type
+ * @get_batt_temp : get battery temperature
+ * @ac : charging parameters for AC type charger
+ * @usb : charging parameters for USB type charger
*/
struct lp8727_platform_data {
u8 (*get_batt_present)(void);
u16 (*get_batt_level)(void);
u8 (*get_batt_capacity)(void);
u8 (*get_batt_temp)(void);
- struct lp8727_chg_param ac;
- struct lp8727_chg_param usb;
+ struct lp8727_chg_param *ac;
+ struct lp8727_chg_param *usb;
};
#endif
--
1.7.9.5
Best Regards,
Milo
--
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