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Message-Id: <1384365877-12355-7-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date: Wed, 13 Nov 2013 18:04:37 +0000
From: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To: cw00.choi@...sung.com
Cc: myungjoo.ham@...sung.com, sameo@...ux.intel.com,
lee.jones@...aro.org, patches@...nsource.wolfsonmicro.com,
linux-kernel@...r.kernel.org,
Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Subject: [PATCH 7/7] extcon: arizona: Improve headphone detection error handling
In several places the return value of regmap operations is not checked
whilst handling headphone detection. This patch adds checks for these
return values. Additionally, failing to read/write a register is a
serious enough error we should abort the headphone detection process so
correct a couple of cases where this was not the case.
Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
drivers/extcon/extcon-arizona.c | 82 ++++++++++++++++++++++++++++----------
1 files changed, 60 insertions(+), 22 deletions(-)
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 4441be4..ea3a22c 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -399,22 +399,32 @@ static int arizona_hpdet_read_ip1(struct arizona_extcon_info *info)
ret = regmap_read(arizona->regmap, ARIZONA_HP_DACVAL, &val);
if (ret != 0) {
dev_err(arizona->dev, "Failed to read HP value: %d\n", ret);
- return -EAGAIN;
+ return ret;
}
- regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1, &range);
+ ret = regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1, &range);
range = (range & ARIZONA_HP_IMPEDANCE_RANGE_MASK)
>> ARIZONA_HP_IMPEDANCE_RANGE_SHIFT;
+ if (ret != 0) {
+ dev_err(arizona->dev, "Failed to read HP range: %d\n", ret);
+ return ret;
+ }
if (range < ARRAY_SIZE(arizona_hpdet_b_ranges) - 1 &&
(val < 100 || val >= 0x3fb)) {
range++;
dev_dbg(arizona->dev, "Moving to HPDET range %d\n", range);
- regmap_update_bits(arizona->regmap,
- ARIZONA_HEADPHONE_DETECT_1,
- ARIZONA_HP_IMPEDANCE_RANGE_MASK,
- range <<
- ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_IMPEDANCE_RANGE_MASK,
+ range <<
+ ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to move range (%d): %d\n",
+ range, ret);
+ return ret;
+ }
return -EAGAIN;
}
@@ -453,7 +463,11 @@ static int arizona_hpdet_read_ip2(struct arizona_extcon_info *info)
val &= ARIZONA_HP_LVL_B_MASK;
val /= 2;
- regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1, &range);
+ ret = regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1, &range);
+ if (ret != 0) {
+ dev_err(arizona->dev, "Failed to read HP range: %d\n", ret);
+ return ret;
+ }
range = (range & ARIZONA_HP_IMPEDANCE_RANGE_MASK)
>> ARIZONA_HP_IMPEDANCE_RANGE_SHIFT;
@@ -464,11 +478,17 @@ static int arizona_hpdet_read_ip2(struct arizona_extcon_info *info)
dev_dbg(arizona->dev, "Moving to HPDET range %d-%d\n",
arizona_hpdet_c_ranges[range].min,
arizona_hpdet_c_ranges[range].max);
- regmap_update_bits(arizona->regmap,
+ ret = regmap_update_bits(arizona->regmap,
ARIZONA_HEADPHONE_DETECT_1,
ARIZONA_HP_IMPEDANCE_RANGE_MASK,
range <<
ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to move range (%d): %d\n",
+ range, ret);
+ return ret;
+ }
return -EAGAIN;
}
@@ -518,6 +538,7 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading,
{
struct arizona *arizona = info->arizona;
int id_gpio = arizona->pdata.hpdet_id_gpio;
+ int ret;
/*
* If we're using HPDET for accessory identification we need
@@ -530,18 +551,30 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading,
if (id_gpio && info->num_hpdet_res == 1) {
dev_dbg(arizona->dev, "Measuring mic\n");
- regmap_update_bits(arizona->regmap,
- ARIZONA_ACCESSORY_DETECT_MODE_1,
- ARIZONA_ACCDET_MODE_MASK |
- ARIZONA_ACCDET_SRC,
- ARIZONA_ACCDET_MODE_HPR |
- info->micd_modes[0].src);
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_ACCESSORY_DETECT_MODE_1,
+ ARIZONA_ACCDET_MODE_MASK |
+ ARIZONA_ACCDET_SRC,
+ ARIZONA_ACCDET_MODE_HPR |
+ info->micd_modes[0].src);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to change HPDET source: %d\n",
+ ret);
+ return ret;
+ }
gpio_set_value_cansleep(id_gpio, 1);
- regmap_update_bits(arizona->regmap,
- ARIZONA_HEADPHONE_DETECT_1,
- ARIZONA_HP_POLL, ARIZONA_HP_POLL);
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_POLL, ARIZONA_HP_POLL);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to re-enable HPDET: %d\n",
+ ret);
+ return ret;
+ }
return -EAGAIN;
}
@@ -574,10 +607,15 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading,
}
/* Make sure everything is reset back to the real polarity */
- regmap_update_bits(arizona->regmap,
- ARIZONA_ACCESSORY_DETECT_MODE_1,
- ARIZONA_ACCDET_SRC,
- info->micd_modes[0].src);
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_ACCESSORY_DETECT_MODE_1,
+ ARIZONA_ACCDET_SRC,
+ info->micd_modes[0].src);
+ if (ret != 0) {
+ dev_err(arizona->dev, "Failed to reset polarity: %d\n",
+ ret);
+ return ret;
+ }
}
return 0;
--
1.7.2.5
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