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Date: Tue, 2 Apr 2013 12:32:44 +0100
From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>
Cc: linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 12/16] extcon: arizona: Simplify HPDET based identification
Rather than measuring both HP channels we can simply directly measure the
microphone impedance and then rely on MICDET for final confirmation of the
presence of a suitable microphone. This improves the overall performance
of the identification process.
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
drivers/extcon/extcon-arizona.c | 46 ++++++++++++++++++++-----------------
include/linux/mfd/arizona/pdata.h | 3 +++
2 files changed, 28 insertions(+), 21 deletions(-)
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 7c4ce81..a83ca27a 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -459,7 +459,8 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
return val;
}
-static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
+static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading,
+ bool *mic)
{
struct arizona *arizona = info->arizona;
int id_gpio = arizona->pdata.hpdet_id_gpio;
@@ -470,11 +471,9 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
*/
if (arizona->pdata.hpdet_acc_id) {
info->hpdet_res[info->num_hpdet_res++] = *reading;
- info->hpdet_res[info->num_hpdet_res++] = *reading;
/* Only check the mic directly if we didn't already ID it */
- if (id_gpio && info->num_hpdet_res == 2 &&
- !((info->hpdet_res[0] > info->hpdet_res[1] * 2))) {
+ if (id_gpio && info->num_hpdet_res == 1) {
dev_dbg(arizona->dev, "Measuring mic\n");
regmap_update_bits(arizona->regmap,
@@ -493,10 +492,8 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
}
/* OK, got both. Now, compare... */
- dev_dbg(arizona->dev, "HPDET measured %d %d %d\n",
- info->hpdet_res[0], info->hpdet_res[1],
- info->hpdet_res[2]);
-
+ dev_dbg(arizona->dev, "HPDET measured %d %d\n",
+ info->hpdet_res[0], info->hpdet_res[1]);
/* Take the headphone impedance for the main report */
*reading = info->hpdet_res[0];
@@ -512,13 +509,11 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
}
/*
- * Either the two grounds measure differently or we
- * measure the mic as high impedance.
+ * If we measure the mic as
*/
- if ((info->hpdet_res[0] > info->hpdet_res[1] * 2) ||
- (id_gpio && info->hpdet_res[2] > 1257)) {
+ if (!id_gpio || info->hpdet_res[1] > 50) {
dev_dbg(arizona->dev, "Detected mic\n");
- info->mic = true;
+ *mic = true;
info->detecting = true;
} else {
dev_dbg(arizona->dev, "Detected headphone\n");
@@ -541,6 +536,7 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
int id_gpio = arizona->pdata.hpdet_id_gpio;
int report = ARIZONA_CABLE_HEADPHONE;
int ret, reading;
+ bool mic = false;
mutex_lock(&info->lock);
@@ -576,7 +572,7 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
ARIZONA_HP_IMPEDANCE_RANGE_MASK | ARIZONA_HP_POLL,
0);
- ret = arizona_hpdet_do_id(info, &reading);
+ ret = arizona_hpdet_do_id(info, &reading, &mic);
if (ret == -EAGAIN) {
goto out;
} else if (ret < 0) {
@@ -606,7 +602,7 @@ done:
ARIZONA_ACCDET_MODE_MASK, ARIZONA_ACCDET_MODE_MIC);
/* If we have a mic then reenable MICDET */
- if (info->mic)
+ if (mic || info->mic)
arizona_start_mic(info);
if (info->hpdet_active) {
@@ -681,6 +677,8 @@ err:
static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info)
{
struct arizona *arizona = info->arizona;
+ int hp_reading = 32;
+ bool mic;
int ret;
dev_dbg(arizona->dev, "Starting identification via HPDET\n");
@@ -702,12 +700,18 @@ static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info)
goto err;
}
- ret = regmap_update_bits(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1,
- ARIZONA_HP_POLL, ARIZONA_HP_POLL);
- if (ret != 0) {
- dev_err(arizona->dev, "Can't start HPDETL measurement: %d\n",
- ret);
- goto err;
+ if (arizona->pdata.hpdet_acc_id_line) {
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_POLL, ARIZONA_HP_POLL);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Can't start HPDETL measurement: %d\n",
+ ret);
+ goto err;
+ }
+ } else {
+ arizona_hpdet_do_id(info, &hp_reading, &mic);
}
return;
diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
index 008b8c4..45c8477 100644
--- a/include/linux/mfd/arizona/pdata.h
+++ b/include/linux/mfd/arizona/pdata.h
@@ -128,6 +128,9 @@ struct arizona_pdata {
/** Use the headphone detect circuit to identify the accessory */
bool hpdet_acc_id;
+ /** Check for line output with HPDET method */
+ bool hpdet_acc_id_line;
+
/** GPIO used for mic isolation with HPDET */
int hpdet_id_gpio;
--
1.7.10.4
--
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