[PATCH 07/11] extcon: arizona: Enable basic headphone identification

From: Mark Brown
Date: Thu Jan 10 2013 - 07:04:59 EST

Use the headphone detection to identify if the accessory is a headphone or
line load. There are two different revisions of the IP with different
register layouts, support both.

Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
drivers/extcon/extcon-arizona.c | 341 +++++++++++++++++++++++++++++++--
drivers/mfd/wm5102-tables.c | 3 +
include/linux/mfd/arizona/registers.h | 12 ++
3 files changed, 335 insertions(+), 21 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index b5190a8..cc258a8 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -31,8 +31,14 @@
#include <linux/mfd/arizona/pdata.h>
#include <linux/mfd/arizona/registers.h>

+#define ARIZONA_DEFAULT_HP 32
+
#define ARIZONA_NUM_BUTTONS 6

+#define ARIZONA_ACCDET_MODE_MIC 0
+#define ARIZONA_ACCDET_MODE_HPL 1
+#define ARIZONA_ACCDET_MODE_HPR 2
+
struct arizona_extcon_info {
struct device *dev;
struct arizona *arizona;
@@ -47,10 +53,14 @@ struct arizona_extcon_info {
bool micd_reva;
bool micd_clamp;

+ bool hpdet_active;
+
bool mic;
bool detecting;
int jack_flips;

+ int hpdet_ip;
+
struct extcon_dev edev;
};

@@ -74,11 +84,13 @@ static struct {
#define ARIZONA_CABLE_MECHANICAL 0
#define ARIZONA_CABLE_MICROPHONE 1
#define ARIZONA_CABLE_HEADPHONE 2
+#define ARIZONA_CABLE_LINEOUT 3

static const char *arizona_cable[] = {
"Mechanical",
"Microphone",
"Headphone",
+ "Line-out",
NULL,
};

@@ -100,6 +112,290 @@ static void arizona_extcon_set_mode(struct arizona_extcon_info *info, int mode)
dev_dbg(arizona->dev, "Set jack polarity to %d\n", mode);
}

+static struct {
+ unsigned int factor_a;
+ unsigned int factor_b;
+} arizona_hpdet_b_ranges[] = {
+ { 5528, 362464 },
+ { 11084, 6186851 },
+ { 11065, 65460395 },
+};
+
+static struct {
+ int min;
+ int max;
+} arizona_hpdet_c_ranges[] = {
+ { 0, 30 },
+ { 8, 100 },
+ { 100, 1000 },
+ { 1000, 10000 },
+};
+
+static int arizona_hpdet_read(struct arizona_extcon_info *info)
+{
+ struct arizona *arizona = info->arizona;
+ unsigned int val, range;
+ int ret;
+
+ ret = regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_2, &val);
+ if (ret != 0) {
+ dev_err(arizona->dev, "Failed to read HPDET status: %d\n",
+ ret);
+ return ret;
+ }
+
+ switch (info->hpdet_ip) {
+ case 0:
+ if (!(val & ARIZONA_HP_DONE)) {
+ dev_err(arizona->dev, "HPDET did not complete: %x\n",
+ val);
+ val = ARIZONA_DEFAULT_HP;
+ }
+
+ val &= ARIZONA_HP_LVL_MASK;
+ break;
+
+ case 1:
+ if (!(val & ARIZONA_HP_DONE_B)) {
+ dev_err(arizona->dev, "HPDET did not complete: %x\n",
+ val);
+ return ARIZONA_DEFAULT_HP;
+ }
+
+ 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 ARIZONA_DEFAULT_HP;
+ }
+
+ regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1,
+ &range);
+ range = (range & ARIZONA_HP_IMPEDANCE_RANGE_MASK)
+ >> ARIZONA_HP_IMPEDANCE_RANGE_SHIFT;
+
+ 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);
+ return -EAGAIN;
+ }
+
+ /* If we go out of range report top of range */
+ if (val < 100 || val > 0x3fb) {
+ dev_dbg(arizona->dev, "Measurement out of range\n");
+ return 10000;
+ }
+
+ dev_dbg(arizona->dev, "HPDET read %d in range %d\n",
+ val, range);
+
+ val = arizona_hpdet_b_ranges[range].factor_b
+ / ((val * 100) -
+ arizona_hpdet_b_ranges[range].factor_a);
+ break;
+
+ default:
+ dev_warn(arizona->dev, "Unknown HPDET IP revision %d\n",
+ info->hpdet_ip);
+ case 2:
+ if (!(val & ARIZONA_HP_DONE_B)) {
+ dev_err(arizona->dev, "HPDET did not complete: %x\n",
+ val);
+ return ARIZONA_DEFAULT_HP;
+ }
+
+ val &= ARIZONA_HP_LVL_B_MASK;
+
+ regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1,
+ &range);
+ range = (range & ARIZONA_HP_IMPEDANCE_RANGE_MASK)
+ >> ARIZONA_HP_IMPEDANCE_RANGE_SHIFT;
+
+ /* Skip up or down a range? */
+ if (range && (val < arizona_hpdet_c_ranges[range].min)) {
+ range--;
+ 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,
+ ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_IMPEDANCE_RANGE_MASK,
+ range <<
+ ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
+ return -EAGAIN;
+ }
+
+ if (range < ARRAY_SIZE(arizona_hpdet_c_ranges) - 1 &&
+ (val >= arizona_hpdet_c_ranges[range].max)) {
+ range++;
+ 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,
+ ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_IMPEDANCE_RANGE_MASK,
+ range <<
+ ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
+ return -EAGAIN;
+ }
+ }
+
+ dev_dbg(arizona->dev, "HP impedance %d ohms\n", val);
+ return val;
+}
+
+static irqreturn_t arizona_hpdet_irq(int irq, void *data)
+{
+ struct arizona_extcon_info *info = data;
+ struct arizona *arizona = info->arizona;
+ int report = ARIZONA_CABLE_HEADPHONE;
+ int ret;
+
+ mutex_lock(&info->lock);
+
+ /* If we got a spurious IRQ for some reason then ignore it */
+ if (!info->hpdet_active) {
+ dev_warn(arizona->dev, "Spurious HPDET IRQ\n");
+ mutex_unlock(&info->lock);
+ return IRQ_NONE;
+ }
+
+ /* If the cable was removed while measuring ignore the result */
+ ret = extcon_get_cable_state_(&info->edev, ARIZONA_CABLE_MECHANICAL);
+ if (ret < 0) {
+ dev_err(arizona->dev, "Failed to check cable state: %d\n",
+ ret);
+ goto out;
+ } else if (!ret) {
+ dev_dbg(arizona->dev, "Ignoring HPDET for removed cable\n");
+ goto done;
+ }
+
+ ret = arizona_hpdet_read(info);
+ if (ret == -EAGAIN) {
+ goto out;
+ } else if (ret < 0) {
+ goto done;
+ }
+
+ /* Reset back to starting range */
+ regmap_update_bits(arizona->regmap,
+ ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_IMPEDANCE_RANGE_MASK, 0);
+
+ /* Report high impedence cables as line outputs */
+ if (ret >= 5000)
+ report = ARIZONA_CABLE_LINEOUT;
+ else
+ report = ARIZONA_CABLE_HEADPHONE;
+
+ ret = extcon_set_cable_state_(&info->edev, report, true);
+ if (ret != 0)
+ dev_err(arizona->dev, "Failed to report HP/line: %d\n",
+ ret);
+
+ ret = regmap_update_bits(arizona->regmap, 0x225, 0x4000, 0);
+ if (ret != 0)
+ dev_warn(arizona->dev, "Failed to undo magic: %d\n", ret);
+
+ ret = regmap_update_bits(arizona->regmap, 0x226, 0x4000, 0);
+ if (ret != 0)
+ dev_warn(arizona->dev, "Failed to undo magic: %d\n", ret);
+
+done:
+ regmap_update_bits(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1,
+ ARIZONA_HP_POLL, 0);
+
+ /* Revert back to MICDET mode */
+ regmap_update_bits(arizona->regmap,
+ ARIZONA_ACCESSORY_DETECT_MODE_1,
+ ARIZONA_ACCDET_MODE_MASK, ARIZONA_ACCDET_MODE_MIC);
+
+ /* If we have a mic then reenable MICDET */
+ if (info->mic)
+ arizona_start_mic(info);
+
+ if (info->hpdet_active) {
+ pm_runtime_put_autosuspend(info->dev);
+ info->hpdet_active = false;
+ }
+
+out:
+ mutex_unlock(&info->lock);
+
+ return IRQ_HANDLED;
+}
+
+static void arizona_identify_headphone(struct arizona_extcon_info *info)
+{
+ struct arizona *arizona = info->arizona;
+ int ret;
+
+ dev_dbg(arizona->dev, "Starting HPDET\n");
+
+ /* Make sure we keep the device enabled during the measurement */
+ pm_runtime_get(info->dev);
+
+ info->hpdet_active = true;
+
+ if (info->mic)
+ arizona_stop_mic(info);
+
+ ret = regmap_update_bits(arizona->regmap, 0x225, 0x4000, 0x4000);
+ if (ret != 0)
+ dev_warn(arizona->dev, "Failed to do magic: %d\n", ret);
+
+ ret = regmap_update_bits(arizona->regmap, 0x226, 0x4000, 0x4000);
+ if (ret != 0)
+ dev_warn(arizona->dev, "Failed to do magic: %d\n", ret);
+
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_ACCESSORY_DETECT_MODE_1,
+ ARIZONA_ACCDET_MODE_MASK,
+ ARIZONA_ACCDET_MODE_HPL);
+ if (ret != 0) {
+ dev_err(arizona->dev, "Failed to set HPDETL mode: %d\n", ret);
+ 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;
+ }
+
+ return;
+
+err:
+ regmap_update_bits(arizona->regmap, ARIZONA_ACCESSORY_DETECT_MODE_1,
+ ARIZONA_ACCDET_MODE_MASK, ARIZONA_ACCDET_MODE_MIC);
+
+ /* Just report headphone */
+ ret = extcon_update_state(&info->edev,
+ 1 << ARIZONA_CABLE_HEADPHONE,
+ 1 << ARIZONA_CABLE_HEADPHONE);
+ if (ret != 0)
+ dev_err(arizona->dev, "Failed to report headphone: %d\n", ret);
+
+ if (info->mic)
+ arizona_start_mic(info);
+
+ info->hpdet_active = false;
+}
+ }
+
+ info->hpdet_active = false;
+}
+
static void arizona_start_mic(struct arizona_extcon_info *info)
{
struct arizona *arizona = info->arizona;
@@ -125,6 +421,10 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
regmap_write(arizona->regmap, 0x80, 0x0);
}

+ regmap_update_bits(arizona->regmap,
+ ARIZONA_ACCESSORY_DETECT_MODE_1,
+ ARIZONA_ACCDET_MODE_MASK, ARIZONA_ACCDET_MODE_MIC);
+
regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
&change);
@@ -189,11 +489,11 @@ static irqreturn_t arizona_micdet(int irq, void *data)

/* If we got a high impedence we should have a headset, report it. */
if (info->detecting && (val & 0x400)) {
+ arizona_identify_headphone(info);
+
ret = extcon_update_state(&info->edev,
- 1 << ARIZONA_CABLE_MICROPHONE |
- 1 << ARIZONA_CABLE_HEADPHONE,
- 1 << ARIZONA_CABLE_MICROPHONE |
- 1 << ARIZONA_CABLE_HEADPHONE);
+ 1 << ARIZONA_CABLE_MICROPHONE,
+ 1 << ARIZONA_CABLE_MICROPHONE);

if (ret != 0)
dev_err(arizona->dev, "Headset report failed: %d\n",
@@ -214,17 +514,12 @@ static irqreturn_t arizona_micdet(int irq, void *data)
info->jack_flips++;

if (info->jack_flips >= info->micd_num_modes) {
- dev_dbg(arizona->dev, "Detected headphone\n");
+ dev_dbg(arizona->dev, "Detected HP/line\n");
+ arizona_identify_headphone(info);
+
info->detecting = false;
- arizona_stop_mic(info);

- ret = extcon_set_cable_state_(&info->edev,
- ARIZONA_CABLE_HEADPHONE,
- true);
- if (ret != 0)
- dev_err(arizona->dev,
- "Headphone report failed: %d\n",
- ret);
+ arizona_stop_mic(info);
} else {
info->micd_mode++;
if (info->micd_mode == info->micd_num_modes)
@@ -260,13 +555,7 @@ static irqreturn_t arizona_micdet(int irq, void *data)
info->detecting = false;
arizona_stop_mic(info);

- ret = extcon_set_cable_state_(&info->edev,
- ARIZONA_CABLE_HEADPHONE,
- true);
- if (ret != 0)
- dev_err(arizona->dev,
- "Headphone report failed: %d\n",
- ret);
+ arizona_identify_headphone(info);
} else {
dev_warn(arizona->dev, "Button with no mic: %x\n",
val);
@@ -387,6 +676,7 @@ static int arizona_extcon_probe(struct platform_device *pdev)
break;
default:
info->micd_clamp = true;
+ info->hpdet_ip = 1;
break;
}
break;
@@ -524,6 +814,13 @@ static int arizona_extcon_probe(struct platform_device *pdev)
goto err_fall_wake;
}

+ ret = arizona_request_irq(arizona, ARIZONA_IRQ_HPDET,
+ "HPDET", arizona_hpdet_irq, info);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to get HPDET IRQ: %d\n", ret);
+ goto err_micdet;
+ }
+
regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
ARIZONA_MICD_RATE_MASK,
8 << ARIZONA_MICD_RATE_SHIFT);
@@ -544,11 +841,13 @@ static int arizona_extcon_probe(struct platform_device *pdev)
ret = input_register_device(info->input);
if (ret) {
dev_err(&pdev->dev, "Can't register input device: %d\n", ret);
- goto err_micdet;
+ goto err_hpdet;
}

return 0;

+err_hpdet:
+ arizona_free_irq(arizona, ARIZONA_IRQ_HPDET, info);
err_micdet:
arizona_free_irq(arizona, ARIZONA_IRQ_MICDET, info);
err_fall_wake:
diff --git a/drivers/mfd/wm5102-tables.c b/drivers/mfd/wm5102-tables.c
index 088872a..311cc36 100644
--- a/drivers/mfd/wm5102-tables.c
+++ b/drivers/mfd/wm5102-tables.c
@@ -1106,6 +1106,8 @@ static bool wm5102_readable_register(struct device *dev, unsigned int reg)
case ARIZONA_ACCESSORY_DETECT_MODE_1:
case ARIZONA_HEADPHONE_DETECT_1:
case ARIZONA_HEADPHONE_DETECT_2:
+ case ARIZONA_HP_DACVAL:
+ case ARIZONA_MICD_CLAMP_CONTROL:
case ARIZONA_MIC_DETECT_1:
case ARIZONA_MIC_DETECT_2:
case ARIZONA_MIC_DETECT_3:
@@ -1875,6 +1877,7 @@ static bool wm5102_volatile_register(struct device *dev, unsigned int reg)
case ARIZONA_DSP1_STATUS_2:
case ARIZONA_DSP1_STATUS_3:
case ARIZONA_HEADPHONE_DETECT_2:
+ case ARIZONA_HP_DACVAL:
case ARIZONA_MIC_DETECT_3:
return true;
default:
diff --git a/include/linux/mfd/arizona/registers.h b/include/linux/mfd/arizona/registers.h
index f3211f0..e915053 100644
--- a/include/linux/mfd/arizona/registers.h
+++ b/include/linux/mfd/arizona/registers.h
@@ -119,6 +119,7 @@
#define ARIZONA_ACCESSORY_DETECT_MODE_1 0x293
#define ARIZONA_HEADPHONE_DETECT_1 0x29B
#define ARIZONA_HEADPHONE_DETECT_2 0x29C
+#define ARIZONA_HP_DACVAL 0x29F
#define ARIZONA_MICD_CLAMP_CONTROL 0x2A2
#define ARIZONA_MIC_DETECT_1 0x2A3
#define ARIZONA_MIC_DETECT_2 0x2A4
@@ -2036,6 +2037,9 @@
/*
* R667 (0x29B) - Headphone Detect 1
*/
+#define ARIZONA_HP_IMPEDANCE_RANGE_MASK 0x0600 /* HP_IMPEDANCE_RANGE - [10:9] */
+#define ARIZONA_HP_IMPEDANCE_RANGE_SHIFT 9 /* HP_IMPEDANCE_RANGE - [10:9] */
+#define ARIZONA_HP_IMPEDANCE_RANGE_WIDTH 2 /* HP_IMPEDANCE_RANGE - [10:9] */
#define ARIZONA_HP_STEP_SIZE 0x0100 /* HP_STEP_SIZE */
#define ARIZONA_HP_STEP_SIZE_MASK 0x0100 /* HP_STEP_SIZE */
#define ARIZONA_HP_STEP_SIZE_SHIFT 8 /* HP_STEP_SIZE */
@@ -2070,6 +2074,14 @@
#define ARIZONA_HP_LVL_SHIFT 0 /* HP_LVL - [6:0] */
#define ARIZONA_HP_LVL_WIDTH 7 /* HP_LVL - [6:0] */

+#define ARIZONA_HP_DONE_B 0x8000 /* HP_DONE */
+#define ARIZONA_HP_DONE_B_MASK 0x8000 /* HP_DONE */
+#define ARIZONA_HP_DONE_B_SHIFT 15 /* HP_DONE */
+#define ARIZONA_HP_DONE_B_WIDTH 1 /* HP_DONE */
+#define ARIZONA_HP_LVL_B_MASK 0x7FFF /* HP_LVL - [14:0] */
+#define ARIZONA_HP_LVL_B_SHIFT 0 /* HP_LVL - [14:0] */
+#define ARIZONA_HP_LVL_B_WIDTH 15 /* HP_LVL - [14:0] */
+
/*
* R674 (0x2A2) - MICD clamp control
*/
--
1.7.10.4

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