regulator: 88pm860x: Add pre-regulator support for 88pm860x regulator

Pre-regulator of 88pm8606 is mainly for support charging based on vbus,
it needs to be enabled for charging battery, and will be disabled in
some exception condition like over-temp.
Add the pre-regulator support for 88pm860x regulator driver.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/regulator/88pm8607.c b/drivers/regulator/88pm8607.c
index 843c89a15472..d34bd8c5ad08 100644
--- a/drivers/regulator/88pm8607.c
+++ b/drivers/regulator/88pm8607.c
@@ -23,6 +23,7 @@ struct pm8607_regulator_info {
         struct pm860x_chip      *chip;
         struct regulator_dev    *regulator;
         struct i2c_client       *i2c;
+        struct i2c_client       *i2c_8606;
 
         unsigned int    *vol_table;
         unsigned int    *vol_suspend;
@@ -242,6 +243,35 @@ static int pm8607_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
         return ret;
 }
 
+static int pm8606_preg_enable(struct regulator_dev *rdev)
+{
+        struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
+
+        return pm860x_set_bits(info->i2c, rdev->desc->enable_reg,
+                               1 << rdev->desc->enable_mask, 0);
+}
+
+static int pm8606_preg_disable(struct regulator_dev *rdev)
+{
+        struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
+
+        return pm860x_set_bits(info->i2c, rdev->desc->enable_reg,
+                               1 << rdev->desc->enable_mask,
+                               1 << rdev->desc->enable_mask);
+}
+
+static int pm8606_preg_is_enabled(struct regulator_dev *rdev)
+{
+        struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
+        int ret;
+
+        ret = pm860x_reg_read(info->i2c, rdev->desc->enable_reg);
+        if (ret < 0)
+                return ret;
+
+        return !((unsigned char)ret & (1 << rdev->desc->enable_mask));
+}
+
 static struct regulator_ops pm8607_regulator_ops = {
         .list_voltage   = pm8607_list_voltage,
         .set_voltage_sel = pm8607_set_voltage_sel,
@@ -251,6 +281,25 @@ static struct regulator_ops pm8607_regulator_ops = {
         .is_enabled = regulator_is_enabled_regmap,
 };
 
+static struct regulator_ops pm8606_preg_ops = {
+        .enable         = pm8606_preg_enable,
+        .disable        = pm8606_preg_disable,
+        .is_enabled     = pm8606_preg_is_enabled,
+};
+
+#define PM8606_PREG(ereg, ebit)                                         \
+{                                                                       \
+        .desc   = {                                                     \
+                .name   = "PREG",                                       \
+                .ops    = &pm8606_preg_ops,                             \
+                .type   = REGULATOR_CURRENT,                            \
+                .id     = PM8606_ID_PREG,                               \
+                .owner  = THIS_MODULE,                                  \
+                .enable_reg = PM8606_##ereg,                            \
+                .enable_mask = (ebit),                                  \
+        },                                                              \
+}
+
 #define PM8607_DVC(vreg, ureg, ubit, ereg, ebit)                        \
 {                                                                       \
         .desc   = {                                                     \
@@ -309,6 +358,8 @@ static struct pm8607_regulator_info pm8607_regulator_info[] = {
         PM8607_LDO(12,        LDO12, 0, SUPPLIES_EN12, 5),
         PM8607_LDO(13, VIBRATOR_SET, 1, VIBRATOR_SET, 0),
         PM8607_LDO(14,        LDO14, 0, SUPPLIES_EN12, 6),
+
+        PM8606_PREG(PREREGULATORB, 5),
 };
 
 static int __devinit pm8607_regulator_probe(struct platform_device *pdev)
@@ -336,6 +387,8 @@ static int __devinit pm8607_regulator_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
         info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
+        info->i2c_8606 = (chip->id == CHIP_PM8607) ? chip->companion :
+                        chip->client;
         info->chip = chip;
 
         /* check DVC ramp slope double */
@@ -371,6 +424,18 @@ static int __devexit pm8607_regulator_remove(struct platform_device *pdev)
         return 0;
 }
 
+static struct platform_device_id pm8607_regulator_driver_ids[] = {
+        {
+                .name   = "88pm860x-regulator",
+                .driver_data    = 0,
+        }, {
+                .name   = "88pm860x-preg",
+                .driver_data    = 0,
+        },
+        { },
+};
+MODULE_DEVICE_TABLE(platform, pm8607_regulator_driver_ids);
+
 static struct platform_driver pm8607_regulator_driver = {
         .driver         = {
                 .name   = "88pm860x-regulator",
@@ -378,6 +443,7 @@ static struct platform_driver pm8607_regulator_driver = {
         },
         .probe          = pm8607_regulator_probe,
         .remove         = __devexit_p(pm8607_regulator_remove),
+        .id_table       = pm8607_regulator_driver_ids,
 };
 
 static int __init pm8607_regulator_init(void)