extcon: arizona: Implement button detection support

As well as identifying accessories the accessory detection hardware on
Arizona class devices can also detect a number of buttons which we should
report via the input API.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 65 insertions, 7 deletions

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 427a289f32a5..fa2114f1f9ec 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
+#include <linux/input.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
@@ -30,11 +31,14 @@
 #include <linux/mfd/arizona/pdata.h>
 #include <linux/mfd/arizona/registers.h>
 
+#define ARIZONA_NUM_BUTTONS 6
+
 struct arizona_extcon_info {
         struct device *dev;
         struct arizona *arizona;
         struct mutex lock;
         struct regulator *micvdd;
+        struct input_dev *input;
 
         int micd_mode;
         const struct arizona_micd_config *micd_modes;
@@ -54,6 +58,18 @@ static const struct arizona_micd_config micd_default_modes[] = {
         { 0,                  2 << ARIZONA_MICD_BIAS_SRC_SHIFT, 1 },
 };
 
+static struct {
+        u16 status;
+        int report;
+} arizona_lvl_to_key[ARIZONA_NUM_BUTTONS] = {
+        {  0x1, BTN_0 },
+        {  0x2, BTN_1 },
+        {  0x4, BTN_2 },
+        {  0x8, BTN_3 },
+        { 0x10, BTN_4 },
+        { 0x20, BTN_5 },
+};
+
 #define ARIZONA_CABLE_MECHANICAL 0
 #define ARIZONA_CABLE_MICROPHONE 1
 #define ARIZONA_CABLE_HEADPHONE  2
@@ -133,6 +149,7 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
 
         if (change) {
                 regulator_disable(info->micvdd);
+                pm_runtime_mark_last_busy(info->dev);
                 pm_runtime_put_autosuspend(info->dev);
         }
 }
@@ -141,8 +158,8 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 {
         struct arizona_extcon_info *info = data;
         struct arizona *arizona = info->arizona;
-        unsigned int val;
-        int ret;
+        unsigned int val, lvl;
+        int ret, i;
 
         mutex_lock(&info->lock);
 
@@ -219,13 +236,22 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 
         /*
          * If we're still detecting and we detect a short then we've
-         * got a headphone.  Otherwise it's a button press, the
-         * button reporting is stubbed out for now.
+         * got a headphone.  Otherwise it's a button press.
          */
         if (val & 0x3fc) {
                 if (info->mic) {
                         dev_dbg(arizona->dev, "Mic button detected\n");
 
+                        lvl = val & ARIZONA_MICD_LVL_MASK;
+                        lvl >>= ARIZONA_MICD_LVL_SHIFT;
+
+                        for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
+                                if (lvl & arizona_lvl_to_key[i].status)
+                                        input_report_key(info->input,
+                                                         arizona_lvl_to_key[i].report,
+                                                         1);
+                        input_sync(info->input);
+
                 } else if (info->detecting) {
                         dev_dbg(arizona->dev, "Headphone detected\n");
                         info->detecting = false;
@@ -244,6 +270,10 @@ static irqreturn_t arizona_micdet(int irq, void *data)
                 }
         } else {
                 dev_dbg(arizona->dev, "Mic button released\n");
+                for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
+                        input_report_key(info->input,
+                                         arizona_lvl_to_key[i].report, 0);
+                input_sync(info->input);
         }
 
 handled:
@@ -258,7 +288,7 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
         struct arizona_extcon_info *info = data;
         struct arizona *arizona = info->arizona;
         unsigned int val;
-        int ret;
+        int ret, i;
 
         pm_runtime_get_sync(info->dev);
 
@@ -288,6 +318,11 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
 
                 arizona_stop_mic(info);
 
+                for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
+                        input_report_key(info->input,
+                                         arizona_lvl_to_key[i].report, 0);
+                input_sync(info->input);
+
                 ret = extcon_update_state(&info->edev, 0xffffffff, 0);
                 if (ret != 0)
                         dev_err(arizona->dev, "Removal report failed: %d\n",
@@ -307,7 +342,7 @@ static int __devinit arizona_extcon_probe(struct platform_device *pdev)
         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
         struct arizona_pdata *pdata;
         struct arizona_extcon_info *info;
-        int ret, mode;
+        int ret, mode, i;
 
         pdata = dev_get_platdata(arizona->dev);
 
@@ -382,6 +417,20 @@ static int __devinit arizona_extcon_probe(struct platform_device *pdev)
 
         arizona_extcon_set_mode(info, 0);
 
+        info->input = input_allocate_device();
+        if (!info->input) {
+                dev_err(arizona->dev, "Can't allocate input dev\n");
+                ret = -ENOMEM;
+                goto err_register;
+        }
+
+        for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
+                input_set_capability(info->input, EV_KEY,
+                                     arizona_lvl_to_key[i].report);
+        info->input->name = "Headset";
+        info->input->phys = "arizona/extcon";
+        info->input->dev.parent = &pdev->dev;
+
         pm_runtime_enable(&pdev->dev);
         pm_runtime_idle(&pdev->dev);
         pm_runtime_get_sync(&pdev->dev);
@@ -391,7 +440,7 @@ static int __devinit arizona_extcon_probe(struct platform_device *pdev)
         if (ret != 0) {
                 dev_err(&pdev->dev, "Failed to get JACKDET rise IRQ: %d\n",
                         ret);
-                goto err_register;
+                goto err_input;
         }
 
         ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 1);
@@ -436,6 +485,12 @@ static int __devinit arizona_extcon_probe(struct platform_device *pdev)
 
         pm_runtime_put(&pdev->dev);
 
+        ret = input_register_device(info->input);
+        if (ret) {
+                dev_err(&pdev->dev, "Can't register input device: %d\n", ret);
+                goto err_fall_wake;
+        }
+
         return 0;
 
 err_fall_wake:
@@ -446,6 +501,8 @@ err_rise_wake:
         arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
 err_rise:
         arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
+err_input:
+        input_free_device(info->input);
 err_register:
         pm_runtime_disable(&pdev->dev);
         extcon_dev_unregister(&info->edev);
@@ -468,6 +525,7 @@ static int __devexit arizona_extcon_remove(struct platform_device *pdev)
         regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
                            ARIZONA_JD1_ENA, 0);
         arizona_clk32k_disable(arizona);
+        input_unregister_device(info->input);
         extcon_dev_unregister(&info->edev);
 
         return 0;