regulator: Support MAX8998/LP3974 DVS-GPIO

The previous driver did not support BUCK1-DVS3, BUCK1-DVS4, and
BUCK2-DVS2 modes. This patch adds such modes and an option to block
setting buck1/2 voltages out of the preset values.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 87 insertions, 26 deletions

diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index af52ebfc4927..0ec49ca527a8 100644
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -424,6 +424,9 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
                                 }
                         }
 
+                        if (pdata->buck_voltage_lock)
+                                return -EINVAL;
+
                         /* no predefine regulator found */
                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
@@ -451,18 +454,26 @@ buck1_exit:
                         "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
                         , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
                 if (gpio_is_valid(pdata->buck2_set3)) {
-                        if (max8998->buck2_vol[0] == i) {
-                                max8998->buck1_idx = 0;
-                                buck2_gpio_set(pdata->buck2_set3, 0);
-                        } else {
-                                max8998->buck1_idx = 1;
-                                ret = max8998_get_voltage_register(rdev, &reg,
-                                                                   &shift,
-                                                                   &mask);
-                                ret = max8998_write_reg(i2c, reg, i);
-                                max8998->buck2_vol[1] = i;
-                                buck2_gpio_set(pdata->buck2_set3, 1);
+
+                        /* check if requested voltage */
+                        /* value is already defined */
+                        for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
+                                if (max8998->buck2_vol[j] == i) {
+                                        max8998->buck2_idx = j;
+                                        buck2_gpio_set(pdata->buck2_set3, j);
+                                        goto buck2_exit;
+                                }
                         }
+
+                        if (pdata->buck_voltage_lock)
+                                return -EINVAL;
+
+                        max8998_get_voltage_register(rdev,
+                                        &reg, &shift, &mask);
+                        ret = max8998_write_reg(i2c, reg, i);
+                        max8998->buck2_vol[max8998->buck2_idx] = i;
+                        buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
+buck2_exit:
                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
                                 gpio_get_value(pdata->buck2_set3));
                 } else {
@@ -707,6 +718,9 @@ static __devinit int max8998_pmic_probe(struct platform_device *pdev)
         platform_set_drvdata(pdev, max8998);
         i2c = max8998->iodev->i2c;
 
+        max8998->buck1_idx = pdata->buck1_default_idx;
+        max8998->buck2_idx = pdata->buck2_default_idx;
+
         /* NOTE: */
         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
         /* will be displayed */
@@ -739,23 +753,46 @@ static __devinit int max8998_pmic_probe(struct platform_device *pdev)
                 i = 0;
                 while (buck12_voltage_map_desc.min +
                        buck12_voltage_map_desc.step*i
-                       != (pdata->buck1_max_voltage1 / 1000))
+                       < (pdata->buck1_voltage1 / 1000))
                         i++;
-                printk(KERN_ERR "i:%d, buck1_idx:%d\n", i, max8998->buck1_idx);
                 max8998->buck1_vol[0] = i;
                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
+                if (ret)
+                        return ret;
 
                 /* Set predefined value for BUCK1 register 2 */
                 i = 0;
                 while (buck12_voltage_map_desc.min +
                        buck12_voltage_map_desc.step*i
-                       != (pdata->buck1_max_voltage2 / 1000))
+                       < (pdata->buck1_voltage2 / 1000))
                         i++;
 
                 max8998->buck1_vol[1] = i;
-                printk(KERN_ERR "i:%d, buck1_idx:%d\n", i, max8998->buck1_idx);
-                ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i)
-                        + ret;
+                ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
+                if (ret)
+                        return ret;
+
+                /* Set predefined value for BUCK1 register 3 */
+                i = 0;
+                while (buck12_voltage_map_desc.min +
+                       buck12_voltage_map_desc.step*i
+                       < (pdata->buck1_voltage3 / 1000))
+                        i++;
+
+                max8998->buck1_vol[2] = i;
+                ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
+                if (ret)
+                        return ret;
+
+                /* Set predefined value for BUCK1 register 4 */
+                i = 0;
+                while (buck12_voltage_map_desc.min +
+                       buck12_voltage_map_desc.step*i
+                       < (pdata->buck1_voltage4 / 1000))
+                        i++;
+
+                max8998->buck1_vol[3] = i;
+                ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
                 if (ret)
                         return ret;
 
@@ -772,18 +809,28 @@ static __devinit int max8998_pmic_probe(struct platform_device *pdev)
                 gpio_direction_output(pdata->buck2_set3,
                                       max8998->buck2_idx & 0x1);
 
-                /* BUCK2 - set preset default voltage value to buck2_vol[0] */
+                /* BUCK2 register 1 */
                 i = 0;
                 while (buck12_voltage_map_desc.min +
                        buck12_voltage_map_desc.step*i
-                       != (pdata->buck2_max_voltage / 1000))
+                       < (pdata->buck2_voltage1 / 1000))
                         i++;
-                printk(KERN_ERR "i:%d, buck2_idx:%d\n", i, max8998->buck2_idx);
                 max8998->buck2_vol[0] = i;
                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
                 if (ret)
                         return ret;
 
+                /* BUCK2 register 2 */
+                i = 0;
+                while (buck12_voltage_map_desc.min +
+                       buck12_voltage_map_desc.step*i
+                       < (pdata->buck2_voltage2 / 1000))
+                        i++;
+                printk(KERN_ERR "i2:%d, buck2_idx:%d\n", i, max8998->buck2_idx);
+                max8998->buck2_vol[1] = i;
+                ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
+                if (ret)
+                        return ret;
         }
 
         for (i = 0; i < pdata->num_regulators; i++) {
diff --git a/include/linux/mfd/max8998.h b/include/linux/mfd/max8998.h
index c22b9a417c35..61daa167b576 100644
--- a/include/linux/mfd/max8998.h
+++ b/include/linux/mfd/max8998.h
@@ -70,12 +70,20 @@ struct max8998_regulator_data {
  * @num_regulators: number of regultors used
  * @irq_base: base IRQ number for max8998, required for IRQs
  * @ono: power onoff IRQ number for max8998
- * @buck1_max_voltage1: BUCK1 maximum alowed voltage register 1
- * @buck1_max_voltage2: BUCK1 maximum alowed voltage register 2
- * @buck2_max_voltage: BUCK2 maximum alowed voltage
+ * @buck_voltage_lock: Do NOT change the values of the following six
+ *   registers set by buck?_voltage?. The voltage of BUCK1/2 cannot
+ *   be other than the preset values.
+ * @buck1_voltage1: BUCK1 DVS mode 1 voltage register
+ * @buck1_voltage2: BUCK1 DVS mode 2 voltage register
+ * @buck1_voltage3: BUCK1 DVS mode 3 voltage register
+ * @buck1_voltage4: BUCK1 DVS mode 4 voltage register
+ * @buck2_voltage1: BUCK2 DVS mode 1 voltage register
+ * @buck2_voltage2: BUCK2 DVS mode 2 voltage register
  * @buck1_set1: BUCK1 gpio pin 1 to set output voltage
  * @buck1_set2: BUCK1 gpio pin 2 to set output voltage
+ * @buck1_default_idx: Default for BUCK1 gpio pin 1, 2
  * @buck2_set3: BUCK2 gpio pin to set output voltage
+ * @buck2_default_idx: Default for BUCK2 gpio pin.
  * @wakeup: Allow to wake up from suspend
  * @rtc_delay: LP3974 RTC chip bug that requires delay after a register
  * write before reading it.
@@ -85,12 +93,18 @@ struct max8998_platform_data {
         int                             num_regulators;
         int                             irq_base;
         int                             ono;
-        int                             buck1_max_voltage1;
-        int                             buck1_max_voltage2;
-        int                             buck2_max_voltage;
+        bool                            buck_voltage_lock;
+        int                             buck1_voltage1;
+        int                             buck1_voltage2;
+        int                             buck1_voltage3;
+        int                             buck1_voltage4;
+        int                             buck2_voltage1;
+        int                             buck2_voltage2;
         int                             buck1_set1;
         int                             buck1_set2;
+        int                             buck1_default_idx;
         int                             buck2_set3;
+        int                             buck2_default_idx;
         bool                            wakeup;
         bool                            rtc_delay;
 };