max77693: Add support for OTG host power supply

The max77693_otg_control function was adapted from the 3.0 vendor kernel.
The modification were done to the max77693_read_reg and max77693_write_reg
calls. In the 3.10 kernel these functions use regmap.

Change-Id: If6e42fa3ef1ef5fdc1fe846b3b8a1c517928b626
Signed-off-by: Kamil Debski <k.debski@samsung.com>

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index d6e185e..cffae9d 100644 (file)
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -28,6 +28,7 @@
 #include <linux/extcon.h>
 #include <linux/regmap.h>
 #include <linux/irqdomain.h>
+#include <linux/delay.h>
 
 #define        DEV_NAME                        "max77693-muic"
 #define        DELAY_MS_DEFAULT                20000           /* unit: millisecond */
@@ -600,6 +601,75 @@ static int max77693_muic_dock_button_handler(struct max77693_muic_info *info,
        return 0;
 }
 
+void max77693_otg_control(struct max77693_muic_info *info, int enable)
+{
+       static u8 chg_int_state;
+       u8 int_mask, cdetctrl1, chg_cnfg_00;
+       dev_dbg(info->dev, "%s: enable(%d)\n", __func__, enable);
+
+       if (enable) {
+               /* disable charger interrupt */
+               max77693_read_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_INT_MASK, &int_mask);
+               chg_int_state = int_mask;
+               int_mask |= (1 << 4);   /* disable chgin intr */
+               int_mask |= (1 << 6);   /* disable chg */
+               int_mask &= ~(1 << 0);  /* enable byp intr */
+               max77693_write_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_INT_MASK, int_mask);
+
+               /* disable charger detection */
+               max77693_read_reg(info->max77693->regmap_muic,
+                       MAX77693_MUIC_REG_CDETCTRL1, &cdetctrl1);
+               cdetctrl1 &= ~(1 << 0);
+               max77693_write_reg(info->max77693->regmap_muic,
+                       MAX77693_MUIC_REG_CDETCTRL1, cdetctrl1);
+
+               /* OTG on, boost on, DIS_MUIC_CTRL=1 */
+               max77693_read_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_CNFG_00, &chg_cnfg_00);
+               chg_cnfg_00 &= ~(CHG_CNFG_00_CHG_MASK
+                               | CHG_CNFG_00_OTG_MASK
+                               | CHG_CNFG_00_BUCK_MASK
+                               | CHG_CNFG_00_BOOST_MASK
+                               | CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+               chg_cnfg_00 |= (CHG_CNFG_00_OTG_MASK
+                               | CHG_CNFG_00_BOOST_MASK
+                               | CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+               max77693_write_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_CNFG_00, chg_cnfg_00);
+       } else {
+               /* OTG off, boost off, (buck on),
+                  DIS_MUIC_CTRL = 0 unless CHG_ENA = 1 */
+               max77693_read_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_CNFG_00, &chg_cnfg_00);
+               chg_cnfg_00 &= ~(CHG_CNFG_00_OTG_MASK
+                               | CHG_CNFG_00_BOOST_MASK
+                               | CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+               chg_cnfg_00 |= CHG_CNFG_00_BUCK_MASK;
+               max77693_write_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_CNFG_00, chg_cnfg_00);
+
+               msleep(50);
+
+               /* enable charger detection */
+               max77693_read_reg(info->max77693->regmap_muic,
+                       MAX77693_MUIC_REG_CDETCTRL1, &cdetctrl1);
+               cdetctrl1 |= (1 << 0);
+               max77693_write_reg(info->max77693->regmap_muic,
+                       MAX77693_MUIC_REG_CDETCTRL1, cdetctrl1);
+
+               /* enable charger interrupt */
+               max77693_write_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_INT_MASK, chg_int_state);
+               max77693_read_reg(info->max77693->regmap,
+                       MAX77693_CHG_REG_CHG_INT_MASK, &int_mask);
+       }
+
+       dev_dbg(info->dev, "%s: INT_MASK(0x%x), CDETCTRL1(0x%x), CHG_CNFG_00(0x%x)\n",
+                               __func__, int_mask, cdetctrl1, chg_cnfg_00);
+}
+
 static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)
 {
        int cable_type_gnd;
@@ -617,6 +687,7 @@ static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)
                if (ret < 0)
                        return ret;
                extcon_set_cable_state(info->edev, "USB-Host", attached);
+               max77693_otg_control(info, attached);
                break;
        case MAX77693_MUIC_GND_AV_CABLE_LOAD:
                /* Audio Video Cable with load, PATH:AUDIO */