extcon: arizona: Enable basic headphone identification

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@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>

1 files changed, 320 insertions, 21 deletions

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index b5190a811601..cc258a8842ef 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: