extcon: max77693: Add support dock device and buttons

This patch support detection of dock device with extcon and
buttons of dock device for playing music with input subsystem.

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

1 files changed, 216 insertions, 39 deletions

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index 26ce4dfeda10..07ea96bfd0cb 100644
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
@@ -44,11 +45,15 @@ struct max77693_muic_info {
         int prev_cable_type;
         int prev_cable_type_gnd;
         int prev_chg_type;
+        int prev_button_type;
         u8 status[2];
 
         int irq;
         struct work_struct irq_work;
         struct mutex mutex;
+
+        /* Button of dock device */
+        struct input_dev *dock;
 };
 
 enum max77693_muic_cable_group {
@@ -156,7 +161,10 @@ enum {
         EXTCON_CABLE_JIG_USB_ON,
         EXTCON_CABLE_JIG_USB_OFF,
         EXTCON_CABLE_JIG_UART_OFF,
-        EXTCON_CABLE_AUDIO_VIDEO_LOAD,
+        EXTCON_CABLE_JIG_UART_ON,
+        EXTCON_CABLE_DOCK_SMART,
+        EXTCON_CABLE_DOCK_DESK,
+        EXTCON_CABLE_DOCK_AUDIO,
 
         _EXTCON_CABLE_NUM,
 };
@@ -173,7 +181,10 @@ const char *max77693_extcon_cable[] = {
         [EXTCON_CABLE_JIG_USB_ON]               = "JIG-USB-ON",
         [EXTCON_CABLE_JIG_USB_OFF]              = "JIG-USB-OFF",
         [EXTCON_CABLE_JIG_UART_OFF]             = "JIG-UART-OFF",
-        [EXTCON_CABLE_AUDIO_VIDEO_LOAD]         = "Audio-video-load",
+        [EXTCON_CABLE_JIG_UART_ON]              = "Dock-Car",
+        [EXTCON_CABLE_DOCK_SMART]               = "Dock-Smart",
+        [EXTCON_CABLE_DOCK_DESK]                = "Dock-Desk",
+        [EXTCON_CABLE_DOCK_AUDIO]               = "Dock-Audio",
 
         NULL,
 };
@@ -411,6 +422,96 @@ static int max77693_muic_get_cable_type(struct max77693_muic_info *info,
         return cable_type;
 }
 
+static int max77693_muic_dock_handler(struct max77693_muic_info *info,
+                int cable_type, bool attached)
+{
+        int ret = 0;
+        char dock_name[CABLE_NAME_MAX];
+
+        dev_info(info->dev,
+                "external connector is %s (adc:0x%02x)\n",
+                attached ? "attached" : "detached", cable_type);
+
+        switch (cable_type) {
+        case MAX77693_MUIC_ADC_RESERVED_ACC_3:          /* Dock-Smart */
+                /* PATH:AP_USB */
+                ret = max77693_muic_set_path(info,
+                                CONTROL1_SW_USB, attached);
+                if (ret < 0)
+                        goto out;
+
+                /* Dock-Smart */
+                extcon_set_cable_state(info->edev, "Dock-Smart", attached);
+                goto out;
+        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:    /* Dock-Car */
+                strcpy(dock_name, "Dock-Car");
+                break;
+        case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:       /* Dock-Desk */
+                strcpy(dock_name, "Dock-Desk");
+                break;
+        case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:         /* Dock-Audio */
+                strcpy(dock_name, "Dock-Audio");
+                if (!attached)
+                        extcon_set_cable_state(info->edev, "USB", false);
+                break;
+        }
+
+        /* Dock-Car/Desk/Audio, PATH:AUDIO */
+        ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
+        if (ret < 0)
+                goto out;
+        extcon_set_cable_state(info->edev, dock_name, attached);
+
+out:
+        return ret;
+}
+
+static int max77693_muic_dock_button_handler(struct max77693_muic_info *info,
+                int button_type, bool attached)
+{
+        struct input_dev *dock = info->dock;
+        unsigned int code;
+        int ret = 0;
+
+        switch (button_type) {
+        case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON-1
+                ... MAX77693_MUIC_ADC_REMOTE_S3_BUTTON+1:
+                /* DOCK_KEY_PREV */
+                code = KEY_PREVIOUSSONG;
+                break;
+        case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON-1
+                ... MAX77693_MUIC_ADC_REMOTE_S7_BUTTON+1:
+                /* DOCK_KEY_NEXT */
+                code = KEY_NEXTSONG;
+                break;
+        case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:
+                /* DOCK_VOL_DOWN */
+                code = KEY_VOLUMEDOWN;
+                break;
+        case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:
+                /* DOCK_VOL_UP */
+                code = KEY_VOLUMEUP;
+                break;
+        case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON-1
+                ... MAX77693_MUIC_ADC_REMOTE_S12_BUTTON+1:
+                /* DOCK_KEY_PLAY_PAUSE */
+                code = KEY_PLAYPAUSE;
+                break;
+        default:
+                dev_err(info->dev,
+                        "failed to detect %s key (adc:0x%x)\n",
+                        attached ? "pressed" : "released", button_type);
+                ret = -EINVAL;
+                goto out;
+        }
+
+        input_event(dock, EV_KEY, code, attached);
+        input_sync(dock);
+
+out:
+        return 0;
+}
+
 static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)
 {
         int cable_type_gnd;
@@ -494,6 +595,7 @@ out:
 static int max77693_muic_adc_handler(struct max77693_muic_info *info)
 {
         int cable_type;
+        int button_type;
         bool attached;
         int ret = 0;
 
@@ -519,31 +621,58 @@ static int max77693_muic_adc_handler(struct max77693_muic_info *info)
                 if (ret < 0)
                         goto out;
                 break;
-        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:
-        case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:
-                /* Audio Video cable with no-load */
-                ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
+        case MAX77693_MUIC_ADC_RESERVED_ACC_3:          /* Dock-Smart */
+        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:    /* Dock-Car */
+        case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:       /* Dock-Desk */
+        case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:         /* Dock-Audio */
+                /*
+                 * DOCK device
+                 *
+                 * The MAX77693 MUIC device can detect total 34 cable type
+                 * except of charger cable and MUIC device didn't define
+                 * specfic role of cable in the range of from 0x01 to 0x12
+                 * of ADC value. So, can use/define cable with no role according
+                 * to schema of hardware board.
+                 */
+                ret = max77693_muic_dock_handler(info, cable_type, attached);
+                if (ret < 0)
+                        goto out;
+                break;
+        case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON:        /* DOCK_KEY_PREV */
+        case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON:        /* DOCK_KEY_NEXT */
+        case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:        /* DOCK_VOL_DOWN */
+        case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:       /* DOCK_VOL_UP */
+        case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON:       /* DOCK_KEY_PLAY_PAUSE */
+                /*
+                 * Button of DOCK device
+                 * - the Prev/Next/Volume Up/Volume Down/Play-Pause button
+                 *
+                 * The MAX77693 MUIC device can detect total 34 cable type
+                 * except of charger cable and MUIC device didn't define
+                 * specfic role of cable in the range of from 0x01 to 0x12
+                 * of ADC value. So, can use/define cable with no role according
+                 * to schema of hardware board.
+                 */
+                if (attached)
+                        button_type = info->prev_button_type = cable_type;
+                else
+                        button_type = info->prev_button_type;
+
+                ret = max77693_muic_dock_button_handler(info, button_type,
+                                                        attached);
                 if (ret < 0)
                         goto out;
-                extcon_set_cable_state(info->edev,
-                                "Audio-video-noload", attached);
                 break;
         case MAX77693_MUIC_ADC_SEND_END_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S1_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S2_BUTTON:
-        case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S4_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S5_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S6_BUTTON:
-        case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S8_BUTTON:
-        case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:
-        case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:
         case MAX77693_MUIC_ADC_REMOTE_S11_BUTTON:
-        case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON:
         case MAX77693_MUIC_ADC_RESERVED_ACC_1:
         case MAX77693_MUIC_ADC_RESERVED_ACC_2:
-        case MAX77693_MUIC_ADC_RESERVED_ACC_3:
         case MAX77693_MUIC_ADC_RESERVED_ACC_4:
         case MAX77693_MUIC_ADC_RESERVED_ACC_5:
         case MAX77693_MUIC_ADC_CEA936_AUDIO:
@@ -551,11 +680,12 @@ static int max77693_muic_adc_handler(struct max77693_muic_info *info)
         case MAX77693_MUIC_ADC_TTY_CONVERTER:
         case MAX77693_MUIC_ADC_UART_CABLE:
         case MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG:
-        case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:
         case MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG:
-                /* This accessory isn't used in general case if it is specially
-                   needed to detect additional accessory, should implement
-                   proper operation when this accessory is attached/detached. */
+                /*
+                 * This accessory isn't used in general case if it is specially
+                 * needed to detect additional accessory, should implement
+                 * proper operation when this accessory is attached/detached.
+                 */
                 dev_info(info->dev,
                         "accessory is %s but it isn't used (adc:0x%x)\n",
                         attached ? "attached" : "detached", cable_type);
@@ -576,6 +706,7 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info)
 {
         int chg_type;
         int cable_type_gnd;
+        int cable_type;
         bool attached;
         bool cable_attached;
         int ret = 0;
@@ -590,35 +721,52 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info)
 
         switch (chg_type) {
         case MAX77693_CHARGER_TYPE_USB:
+                /*
+                 * MHL_TA(USB/TA) with MHL cable
+                 * - MHL cable include two port(HDMI line and separate micro
+                 * -usb port. When the target connect MHL cable, extcon driver
+                 * check whether MHL_TA(USB/TA) cable is connected. If MHL_TA
+                 * cable is connected, extcon driver notify state to notifiee
+                 * for charging battery.
+                 */
                 cable_type_gnd = max77693_muic_get_cable_type(info,
                                         MAX77693_CABLE_GROUP_ADC_GND,
                                         &cable_attached);
-
-                switch (cable_type_gnd) {
-                case MAX77693_MUIC_GND_MHL:
-                case MAX77693_MUIC_GND_MHL_VB:
-                        /*
-                         * USB/TA with MHL cable
-                         * - MHL cable, which connect micro USB or TA cable,
-                         * is used to charging battery. So, extcon driver check
-                         * charging type whether micro USB or TA cable is
-                         * connected to MHL cable when extcon driver detect MHL
-                         * cable.
-                         */
+                if (cable_type_gnd == MAX77693_MUIC_GND_MHL
+                        || cable_type_gnd == MAX77693_MUIC_GND_MHL_VB) {
                         extcon_set_cable_state(info->edev, "MHL_TA", attached);
 
                         if (!cable_attached)
                                 extcon_set_cable_state(info->edev,
-                                                "MHL", false);
-                        break;
-                default:
-                        /* Only USB cable, PATH:AP_USB */
-                        ret = max77693_muic_set_path(info, CONTROL1_SW_USB,
-                                                attached);
-                        if (ret < 0)
-                                goto out;
+                                        "MHL", false);
+                        goto out;
+                }
+
+                /*
+                 * USB/TA cable with Dock-Audio device
+                 * - Dock device include two port(Dock-Audio and micro-usb
+                 * port). When the target connect Dock-Audio device, extcon
+                 * driver check whether USB/TA cable is connected.
+                 * If USB/TA cable is connected, extcon driver notify state
+                 * to notifiee for charging battery.
+                 */
+                cable_type = max77693_muic_get_cable_type(info,
+                                        MAX77693_CABLE_GROUP_ADC,
+                                        &cable_attached);
+                if (cable_type == MAX77693_MUIC_ADC_AV_CABLE_NOLOAD) {
                         extcon_set_cable_state(info->edev, "USB", attached);
+
+                        if (!cable_attached)
+                                extcon_set_cable_state(info->edev,
+                                                "Dock-Audio", false);
+                        goto out;
                 }
+
+                /* Only USB cable, PATH:AP_USB */
+                ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
+                if (ret < 0)
+                        goto out;
+                extcon_set_cable_state(info->edev, "USB", attached);
                 break;
         case MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT:
                 extcon_set_cable_state(info->edev,
@@ -794,6 +942,32 @@ static int max77693_muic_probe(struct platform_device *pdev)
                         return ret;
                 }
         }
+
+        /* Register input device for button of dock device */
+        info->dock = input_allocate_device();
+        if (!info->dock) {
+                dev_err(&pdev->dev, "%s: failed to allocate input\n", __func__);
+                return -ENOMEM;
+        }
+        info->dock->name = "max77693-muic/dock";
+        info->dock->phys = "max77693-muic/extcon";
+        info->dock->dev.parent = &pdev->dev;
+
+        __set_bit(EV_REP, info->dock->evbit);
+
+        input_set_capability(info->dock, EV_KEY, KEY_VOLUMEUP);
+        input_set_capability(info->dock, EV_KEY, KEY_VOLUMEDOWN);
+        input_set_capability(info->dock, EV_KEY, KEY_PLAYPAUSE);
+        input_set_capability(info->dock, EV_KEY, KEY_PREVIOUSSONG);
+        input_set_capability(info->dock, EV_KEY, KEY_NEXTSONG);
+
+        ret = input_register_device(info->dock);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Cannot register input device error(%d)\n",
+                                ret);
+                return ret;
+        }
+
         platform_set_drvdata(pdev, info);
         mutex_init(&info->mutex);
 
@@ -870,7 +1044,7 @@ static int max77693_muic_probe(struct platform_device *pdev)
                         MAX77693_MUIC_REG_ID, &id);
         if (ret < 0) {
                 dev_err(&pdev->dev, "failed to read revision number\n");
-                goto err_irq;
+                goto err_extcon;
         }
         dev_info(info->dev, "device ID : 0x%x\n", id);
 
@@ -882,6 +1056,8 @@ static int max77693_muic_probe(struct platform_device *pdev)
 
         return ret;
 
+err_extcon:
+        extcon_dev_unregister(info->edev);
 err_irq:
         while (--i >= 0)
                 free_irq(muic_irqs[i].virq, info);
@@ -896,6 +1072,7 @@ static int max77693_muic_remove(struct platform_device *pdev)
         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
                 free_irq(muic_irqs[i].virq, info);
         cancel_work_sync(&info->irq_work);
+        input_unregister_device(info->dock);
         extcon_dev_unregister(info->edev);
 
         return 0;