[PATCH 4/9] extcon: arizona: Add support for new ADC value mic detect

Charles Keepax
2015-09-16T10:06:36Z

Newer devices give users the option to make the 3/4 pole jack
determination using a software comparison rather than a hardware one.
This patch adds support for this functionality.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
---
drivers/extcon/extcon-arizona.c | 64 +++++++++++++++++++++++++++++++++++----
1 files changed, 58 insertions(+), 6 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 4b9f09c..f213e14 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -48,6 +48,10 @@
#define HPDET_DEBOUNCE 500
#define DEFAULT_MICD_TIMEOUT 2000

+#define QUICK_HEADPHONE_MAX_OHM 3
+#define MICROPHONE_MIN_OHM 1257
+#define MICROPHONE_MAX_OHM 30000
+
#define MICD_DBTIME_TWO_READINGS 2
#define MICD_DBTIME_FOUR_READINGS 4

@@ -117,12 +121,15 @@ static const struct arizona_micd_range micd_default_ranges[] = {
{ .max = 430, .key = BTN_5 },
};

+/* The number of levels in arizona_micd_levels valid for button thresholds */
+#define ARIZONA_NUM_MICD_BUTTON_LEVELS 64
+
static const int arizona_micd_levels[] = {
3, 6, 8, 11, 13, 16, 18, 21, 23, 26, 28, 31, 34, 36, 39, 41, 44, 46,
49, 52, 54, 57, 60, 62, 65, 67, 70, 73, 75, 78, 81, 83, 89, 94, 100,
105, 111, 116, 122, 127, 139, 150, 161, 173, 186, 196, 209, 220, 245,
270, 295, 321, 348, 375, 402, 430, 489, 550, 614, 681, 752, 903, 1071,
- 1257,
+ 1257, 30000,
};

static const unsigned int arizona_cable[] = {
@@ -270,6 +277,7 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
struct arizona *arizona = info->arizona;
bool change;
int ret;
+ unsigned int mode;

/* Microphone detection can't use idle mode */
pm_runtime_get(info->dev);
@@ -295,9 +303,14 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
regmap_write(arizona->regmap, 0x80, 0x0);
}

+ if (info->detecting && arizona->pdata.micd_software_compare)
+ mode = ARIZONA_ACCDET_MODE_ADC;
+ else
+ mode = ARIZONA_ACCDET_MODE_MIC;
+
regmap_update_bits(arizona->regmap,
ARIZONA_ACCESSORY_DETECT_MODE_1,
- ARIZONA_ACCDET_MODE_MASK, ARIZONA_ACCDET_MODE_MIC);
+ ARIZONA_ACCDET_MODE_MASK, mode);

arizona_extcon_pulse_micbias(info);

@@ -804,6 +817,37 @@ static void arizona_micd_detect(struct work_struct *work)
return;
}

+ if (info->detecting && arizona->pdata.micd_software_compare) {
+ /* Must disable MICD before we read the ADCVAL */
+ regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
+ ARIZONA_MICD_ENA, 0);
+ ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_4, &val);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to read MICDET_ADCVAL: %d\n",
+ ret);
+ mutex_unlock(&info->lock);
+ return;
+ }
+
+ dev_dbg(arizona->dev, "MICDET_ADCVAL: %x\n", val);
+
+ val &= ARIZONA_MICDET_ADCVAL_MASK;
+ if (val < ARRAY_SIZE(arizona_micd_levels))
+ val = arizona_micd_levels[val];
+ else
+ val = INT_MAX;
+
+ if (val <= QUICK_HEADPHONE_MAX_OHM)
+ val = ARIZONA_MICD_STS | ARIZONA_MICD_LVL_0;
+ else if (val <= MICROPHONE_MIN_OHM)
+ val = ARIZONA_MICD_STS | ARIZONA_MICD_LVL_1;
+ else if (val <= MICROPHONE_MAX_OHM)
+ val = ARIZONA_MICD_STS | ARIZONA_MICD_LVL_8;
+ else
+ val = ARIZONA_MICD_LVL_8;
+ }
+
for (i = 0; i < 10 && !(val & MICD_LVL_0_TO_8); i++) {
ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_3, &val);
if (ret != 0) {
@@ -932,10 +976,17 @@ static void arizona_micd_detect(struct work_struct *work)
}

handled:
- if (info->detecting)
+ if (info->detecting) {
+ if (arizona->pdata.micd_software_compare)
+ regmap_update_bits(arizona->regmap,
+ ARIZONA_MIC_DETECT_1,
+ ARIZONA_MICD_ENA,
+ ARIZONA_MICD_ENA);
+
queue_delayed_work(system_power_efficient_wq,
&info->micd_timeout_work,
msecs_to_jiffies(info->micd_timeout));
+ }

pm_runtime_mark_last_busy(info->dev);
mutex_unlock(&info->lock);
@@ -1335,7 +1386,8 @@ static int arizona_extcon_probe(struct platform_device *pdev)
break;
}

- BUILD_BUG_ON(ARRAY_SIZE(arizona_micd_levels) != 0x40);
+ BUILD_BUG_ON(ARRAY_SIZE(arizona_micd_levels) <
+ ARIZONA_NUM_MICD_BUTTON_LEVELS);

if (arizona->pdata.num_micd_ranges) {
info->micd_ranges = pdata->micd_ranges;
@@ -1368,11 +1420,11 @@ static int arizona_extcon_probe(struct platform_device *pdev)

/* Set up all the buttons the user specified */
for (i = 0; i < info->num_micd_ranges; i++) {
- for (j = 0; j < ARRAY_SIZE(arizona_micd_levels); j++)
+ for (j = 0; j < ARIZONA_NUM_MICD_BUTTON_LEVELS; j++)
if (arizona_micd_levels[j] >= info->micd_ranges[i].max)
break;

- if (j == ARRAY_SIZE(arizona_micd_levels)) {
+ if (j == ARIZONA_NUM_MICD_BUTTON_LEVELS) {
dev_err(arizona->dev, "Unsupported MICD level %d\n",
info->micd_ranges[i].max);
ret = -EINVAL;
--
1.7.2.5