extcon: sm5502: Change internal hardware switch according to cable type

This patch changes internal hardware DP_CON/DM_CON switch according to
cable type. The SM5502 MUIC device can set hardware switch as following:
- OPEN (not connected state) / USB / UART / AUDIO
Also, this patch set VBUSIN switch according to cable type.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

2 files changed, 96 insertions, 5 deletions

diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
index a32d40f97ff0..560d7dccec7b 100644
--- a/drivers/extcon/extcon-sm5502.c
+++ b/drivers/extcon/extcon-sm5502.c
@@ -228,6 +228,61 @@ static const struct regmap_config sm5502_muic_regmap_config = {
         .max_register   = SM5502_REG_END,
 };
 
+/* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
+static int sm5502_muic_set_path(struct sm5502_muic_info *info,
+                                unsigned int con_sw, unsigned int vbus_sw,
+                                bool attached)
+{
+        int ret;
+
+        if (!attached) {
+                con_sw  = DM_DP_SWITCH_OPEN;
+                vbus_sw = VBUSIN_SWITCH_OPEN;
+        }
+
+        switch (con_sw) {
+        case DM_DP_SWITCH_OPEN:
+        case DM_DP_SWITCH_USB:
+        case DM_DP_SWITCH_AUDIO:
+        case DM_DP_SWITCH_UART:
+                ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
+                                         SM5502_REG_MANUAL_SW1_DP_MASK |
+                                         SM5502_REG_MANUAL_SW1_DM_MASK,
+                                         con_sw);
+                if (ret < 0) {
+                        dev_err(info->dev,
+                                "cannot update DM_CON/DP_CON switch\n");
+                        return ret;
+                }
+                break;
+        default:
+                dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
+                                con_sw);
+                return -EINVAL;
+        };
+
+        switch (vbus_sw) {
+        case VBUSIN_SWITCH_OPEN:
+        case VBUSIN_SWITCH_VBUSOUT:
+        case VBUSIN_SWITCH_MIC:
+        case VBUSIN_SWITCH_VBUSOUT_WITH_USB:
+                ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
+                                         SM5502_REG_MANUAL_SW1_VBUSIN_MASK,
+                                         vbus_sw);
+                if (ret < 0) {
+                        dev_err(info->dev,
+                                "cannot update VBUSIN switch\n");
+                        return ret;
+                }
+                break;
+        default:
+                dev_err(info->dev, "Unknown VBUS switch type (%d)\n", vbus_sw);
+                return -EINVAL;
+        };
+
+        return 0;
+}
+
 /* Return cable type of attached or detached accessories */
 static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
 {
@@ -329,7 +384,10 @@ static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
         static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
         const char **cable_names = info->edev->supported_cable;
         unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
+        unsigned int con_sw = DM_DP_SWITCH_OPEN;
+        unsigned int vbus_sw = VBUSIN_SWITCH_OPEN;
         unsigned int idx = 0;
+        int ret;
 
         if (!cable_names)
                 return 0;
@@ -343,15 +401,19 @@ static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
 
         switch (cable_type) {
         case SM5502_MUIC_ADC_OPEN_USB:
-                idx = EXTCON_CABLE_USB;
+                idx     = EXTCON_CABLE_USB;
+                con_sw  = DM_DP_SWITCH_USB;
+                vbus_sw = VBUSIN_SWITCH_VBUSOUT_WITH_USB;
                 break;
         case SM5502_MUIC_ADC_OPEN_TA:
-                idx = EXTCON_CABLE_TA;
+                idx     = EXTCON_CABLE_TA;
+                con_sw  = DM_DP_SWITCH_OPEN;
+                vbus_sw = VBUSIN_SWITCH_VBUSOUT;
                 break;
         case SM5502_MUIC_ADC_OPEN_USB_OTG:
-                idx = EXTCON_CABLE_USB_HOST;
-                break;
-        case SM5502_MUIC_ADC_GROUND:
+                idx     = EXTCON_CABLE_USB_HOST;
+                con_sw  = DM_DP_SWITCH_USB;
+                vbus_sw = VBUSIN_SWITCH_OPEN;
                 break;
         default:
                 dev_dbg(info->dev,
@@ -359,6 +421,12 @@ static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
                 return 0;
         };
 
+        /* Change internal hardware path(DM_CON/DP_CON, VBUSIN) */
+        ret = sm5502_muic_set_path(info, con_sw, vbus_sw, attached);
+        if (ret < 0)
+                return ret;
+
+        /* Change the state of external accessory */
         extcon_set_cable_state(info->edev, cable_names[idx], attached);
 
         return 0;
diff --git a/include/linux/extcon/sm5502.h b/include/linux/extcon/sm5502.h
index 17bd6550c485..030526bf8d79 100644
--- a/include/linux/extcon/sm5502.h
+++ b/include/linux/extcon/sm5502.h
@@ -223,6 +223,29 @@ enum sm5502_reg {
 #define SM5502_REG_DEV_TYPE2_TTY_MASK                   (0x1 << SM5502_REG_DEV_TYPE2_TTY_SHIFT)
 #define SM5502_REG_DEV_TYPE2_AV_CABLE_MASK              (0x1 << SM5502_REG_DEV_TYPE2_AV_CABLE_SHIFT)
 
+#define SM5502_REG_MANUAL_SW1_VBUSIN_SHIFT      0
+#define SM5502_REG_MANUAL_SW1_DP_SHIFT          2
+#define SM5502_REG_MANUAL_SW1_DM_SHIFT          5
+#define SM5502_REG_MANUAL_SW1_VBUSIN_MASK       (0x3 << SM5502_REG_MANUAL_SW1_VBUSIN_SHIFT)
+#define SM5502_REG_MANUAL_SW1_DP_MASK           (0x7 << SM5502_REG_MANUAL_SW1_DP_SHIFT)
+#define SM5502_REG_MANUAL_SW1_DM_MASK           (0x7 << SM5502_REG_MANUAL_SW1_DM_SHIFT)
+#define VBUSIN_SWITCH_OPEN                      0x0
+#define VBUSIN_SWITCH_VBUSOUT                   0x1
+#define VBUSIN_SWITCH_MIC                       0x2
+#define VBUSIN_SWITCH_VBUSOUT_WITH_USB          0x3
+#define DM_DP_CON_SWITCH_OPEN                   0x0
+#define DM_DP_CON_SWITCH_USB                    0x1
+#define DM_DP_CON_SWITCH_AUDIO                  0x2
+#define DM_DP_CON_SWITCH_UART                   0x3
+#define DM_DP_SWITCH_OPEN                       ((DM_DP_CON_SWITCH_OPEN <<SM5502_REG_MANUAL_SW1_DP_SHIFT) \
+                                                | (DM_DP_CON_SWITCH_OPEN <<SM5502_REG_MANUAL_SW1_DM_SHIFT))
+#define DM_DP_SWITCH_USB                        ((DM_DP_CON_SWITCH_USB <<SM5502_REG_MANUAL_SW1_DP_SHIFT) \
+                                                | (DM_DP_CON_SWITCH_USB <<SM5502_REG_MANUAL_SW1_DM_SHIFT))
+#define DM_DP_SWITCH_AUDIO                      ((DM_DP_CON_SWITCH_AUDIO <<SM5502_REG_MANUAL_SW1_DP_SHIFT) \
+                                                | (DM_DP_CON_SWITCH_AUDIO <<SM5502_REG_MANUAL_SW1_DM_SHIFT))
+#define DM_DP_SWITCH_UART                       ((DM_DP_CON_SWITCH_UART <<SM5502_REG_MANUAL_SW1_DP_SHIFT) \
+                                                | (DM_DP_CON_SWITCH_UART <<SM5502_REG_MANUAL_SW1_DM_SHIFT))
+
 /* SM5502 Interrupts */
 enum sm5502_irq {
         /* INT1 */