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authorMark Brown <broonie@opensource.wolfsonmicro.com>2013-01-11 00:55:54 +0100
committerChanwoo Choi <cw00.choi@samsung.com>2013-01-15 07:42:18 +0100
commit1eda6aa7ce101b59dfd91abef2c8b0e51e96e199 (patch)
tree9dd5a408d0e5d2df0b8ff1c397cbc92cc86a2539 /drivers/extcon
parentextcon: arizona: Support HPDET based accessory identification (diff)
downloadlinux-1eda6aa7ce101b59dfd91abef2c8b0e51e96e199.tar.xz
linux-1eda6aa7ce101b59dfd91abef2c8b0e51e96e199.zip
extcon: arizona: Support direct microphone measurement via HPDET
With some GPIO control it is possible to detect microphones in a wider range of configurations by directly measuring the microphone impedance when the HPDET method cannot distinguish between the behaviour of the two grounds. Allow a GPIO to be provided in platform data and use it to implement this behaviour. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-arizona.c50
1 files changed, 45 insertions, 5 deletions
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index ba9525ee4706..de141f72c8e5 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -56,7 +56,7 @@ struct arizona_extcon_info {
bool hpdet_active;
int num_hpdet_res;
- unsigned int hpdet_res[2];
+ unsigned int hpdet_res[3];
bool mic;
bool detecting;
@@ -313,6 +313,7 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
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;
/*
@@ -338,9 +339,27 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
ARIZONA_ACCESSORY_DETECT_MODE_1,
ARIZONA_ACCDET_SRC,
~info->micd_modes[0].src);
+
regmap_update_bits(arizona->regmap,
ARIZONA_HEADPHONE_DETECT_1,
- ARIZONA_HP_POLL, 0);
+ ARIZONA_HP_POLL, ARIZONA_HP_POLL);
+ return -EAGAIN;
+ }
+
+ /* 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))) {
+ 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);
+
+ gpio_set_value_cansleep(id_gpio, 1);
+
regmap_update_bits(arizona->regmap,
ARIZONA_HEADPHONE_DETECT_1,
ARIZONA_HP_POLL, ARIZONA_HP_POLL);
@@ -348,10 +367,16 @@ 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\n",
- info->hpdet_res[0], info->hpdet_res[1]);
+ dev_dbg(arizona->dev, "HPDET measured %d %d %d\n",
+ info->hpdet_res[0], info->hpdet_res[1],
+ info->hpdet_res[2]);
- if (info->hpdet_res[0] > info->hpdet_res[1] * 2) {
+ /*
+ * Either the two grounds measure differently or we
+ * measure the mic as high impedance.
+ */
+ if ((info->hpdet_res[0] > info->hpdet_res[1] * 2) ||
+ (id_gpio && info->hpdet_res[2] > 10)) {
dev_dbg(arizona->dev, "Detected mic\n");
info->mic = true;
ret = extcon_set_cable_state_(&info->edev,
@@ -382,6 +407,7 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
{
struct arizona_extcon_info *info = data;
struct arizona *arizona = info->arizona;
+ int id_gpio = arizona->pdata.hpdet_id_gpio;
int report = ARIZONA_CABLE_HEADPHONE;
int ret, reading;
@@ -446,6 +472,8 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
dev_warn(arizona->dev, "Failed to undo magic: %d\n", ret);
done:
+ if (id_gpio)
+ gpio_set_value_cansleep(id_gpio, 0);
/* Revert back to MICDET mode */
regmap_update_bits(arizona->regmap,
@@ -854,6 +882,18 @@ static int arizona_extcon_probe(struct platform_device *pdev)
}
}
+ if (arizona->pdata.hpdet_id_gpio > 0) {
+ ret = devm_gpio_request_one(&pdev->dev,
+ arizona->pdata.hpdet_id_gpio,
+ GPIOF_OUT_INIT_LOW,
+ "HPDET");
+ if (ret != 0) {
+ dev_err(arizona->dev, "Failed to request GPIO%d: %d\n",
+ arizona->pdata.hpdet_id_gpio, ret);
+ goto err_register;
+ }
+ }
+
if (arizona->pdata.micd_bias_start_time)
regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
ARIZONA_MICD_BIAS_STARTTIME_MASK,