diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-01-11 03:55:54 +0400 |
|---|---|---|
| committer | Chanwoo Choi <cw00.choi@samsung.com> | 2013-01-15 10:42:18 +0400 |
| commit | 1eda6aa7ce101b59dfd91abef2c8b0e51e96e199 (patch) | |
| tree | 9dd5a408d0e5d2df0b8ff1c397cbc92cc86a2539 /drivers/extcon/extcon-arizona.c | |
| parent | dd235eea4ed75b1599dd9a53bb618fe5befeb731 (diff) | |
| download | linux-1eda6aa7ce101b59dfd91abef2c8b0e51e96e199.tar.xz | |
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/extcon-arizona.c')
| -rw-r--r-- | drivers/extcon/extcon-arizona.c | 50 |
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, |