summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/max8998.c
diff options
context:
space:
mode:
authorLukasz Majewski <l.majewski@samsung.com>2010-09-27 14:32:27 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2010-10-29 00:30:15 +0200
commit50f19a45961ffa0445db02777ad9342119ceb2aa (patch)
treec4e1b67e4e843e53f6c3c8db70883ca8708eaf0f /drivers/regulator/max8998.c
parent58aa6334fbf5cf420a47cfd2718a0b299f40a379 (diff)
downloadlinux-50f19a45961ffa0445db02777ad9342119ceb2aa.tar.gz
linux-50f19a45961ffa0445db02777ad9342119ceb2aa.tar.bz2
linux-50f19a45961ffa0445db02777ad9342119ceb2aa.zip
regulator: max8998 BUCK1/2 voltage change with use of GPIOs
max8998_pmic_probe: - modified to check if valid pins are defined at platform data - maximal voltage values (predefined at platform data) are uploaded to max8998 device max8998_set_voltage_buck: - BUCK1/2 voltages change between values already defined - Checks if valid GPIO pins are passed from platform data - If requested voltage cannot be satisfied from already defined values, then one of free slots is used - Predefined maximum voltages (as defined at platform data) are always available Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/regulator/max8998.c')
-rw-r--r--drivers/regulator/max8998.c214
1 files changed, 193 insertions, 21 deletions
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index 7ae0639c1394..5c20756db607 100644
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -340,24 +340,37 @@ static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
return ret;
}
+static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
+{
+ gpio_set_value(gpio1, v & 0x1);
+ gpio_set_value(gpio2, (v >> 1) & 0x1);
+}
+
+static inline void buck2_gpio_set(int gpio, int v)
+{
+ gpio_set_value(gpio, v & 0x1);
+}
+
static int max8998_set_voltage_buck(struct regulator_dev *rdev,
- int min_uV, int max_uV)
+ int min_uV, int max_uV)
{
struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct max8998_platform_data *pdata =
+ dev_get_platdata(max8998->iodev->dev);
struct i2c_client *i2c = max8998->iodev->i2c;
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
- int previous_vol = 0;
const struct voltage_map_desc *desc;
- int ldo = max8998_get_ldo(rdev);
+ int buck = max8998_get_ldo(rdev);
int reg, shift = 0, mask, ret;
- int i = 0;
- u8 val;
- bool en_ramp = false;
+ int difference = 0, i = 0, j = 0, previous_vol = 0;
+ u8 val = 0;
+ static u8 buck1_last_val;
- if (ldo >= ARRAY_SIZE(ldo_voltage_map))
+ if (buck >= ARRAY_SIZE(ldo_voltage_map))
return -EINVAL;
- desc = ldo_voltage_map[ldo];
+ desc = ldo_voltage_map[buck];
+
if (desc == NULL)
return -EINVAL;
@@ -375,24 +388,102 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
if (ret)
return ret;
- /* wait for RAMP_UP_DELAY if rdev is BUCK1/2 and
- * ENRAMP is ON */
- if (ldo == MAX8998_BUCK1 || ldo == MAX8998_BUCK2) {
- max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
- if (val & (1 << 4)) {
- en_ramp = true;
- previous_vol = max8998_get_voltage(rdev);
- }
+ previous_vol = max8998_get_voltage(rdev);
+
+ /* Check if voltage needs to be changed */
+ /* if previous_voltage equal new voltage, return */
+ if (previous_vol == max8998_list_voltage(rdev, i)) {
+ dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
+ previous_vol, max8998_list_voltage(rdev, i));
+ return ret;
}
- ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
+ switch (buck) {
+ case MAX8998_BUCK1:
+ dev_dbg(max8998->dev,
+ "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n\
+ buck1_vol3:%d, buck1_vol4:%d\n",
+ i, max8998->buck1_vol[0], max8998->buck1_vol[1],
+ max8998->buck1_vol[2], max8998->buck1_vol[3]);
+
+ if (gpio_is_valid(pdata->buck1_set1) &&
+ gpio_is_valid(pdata->buck1_set2)) {
+
+ /* check if requested voltage */
+ /* value is already defined */
+ for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
+ if (max8998->buck1_vol[j] == i) {
+ max8998->buck1_idx = j;
+ buck1_gpio_set(pdata->buck1_set1,
+ pdata->buck1_set2, j);
+ goto buck1_exit;
+ }
+ }
+
+ /* no predefine regulator found */
+ max8998->buck1_idx = (buck1_last_val % 2) + 2;
+ dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
+ max8998->buck1_idx);
+ max8998->buck1_vol[max8998->buck1_idx] = i;
+ ret = max8998_get_voltage_register(rdev, &reg,
+ &shift,
+ &mask);
+ ret = max8998_write_reg(i2c, reg, i);
+ buck1_gpio_set(pdata->buck1_set1,
+ pdata->buck1_set2, max8998->buck1_idx);
+ buck1_last_val++;
+buck1_exit:
+ dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
+ i2c->name, gpio_get_value(pdata->buck1_set1),
+ gpio_get_value(pdata->buck1_set2));
+ break;
+ } else {
+ ret = max8998_write_reg(i2c, reg, i);
+ }
+ break;
- if (en_ramp == true) {
- int difference = desc->min + desc->step*i - previous_vol/1000;
- if (difference > 0)
- udelay(difference / ((val & 0x0f) + 1));
+ case MAX8998_BUCK2:
+ dev_dbg(max8998->dev,
+ "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);
+ }
+ dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
+ gpio_get_value(pdata->buck2_set3));
+ } else {
+ ret = max8998_write_reg(i2c, reg, i);
+ }
+ break;
+
+ case MAX8998_BUCK3:
+ case MAX8998_BUCK4:
+ ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
+ break;
}
+ /* Voltage stabilization */
+ max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
+
+ /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
+ /* MAX8998 has ENRAMP bit implemented, so test it*/
+ if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
+ return ret;
+
+ difference = desc->min + desc->step*i - previous_vol/1000;
+ if (difference > 0)
+ udelay(difference / ((val & 0x0f) + 1));
+
return ret;
}
@@ -586,6 +677,7 @@ static __devinit int max8998_pmic_probe(struct platform_device *pdev)
struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
struct regulator_dev **rdev;
struct max8998_data *max8998;
+ struct i2c_client *i2c;
int i, ret, size;
if (!pdata) {
@@ -609,6 +701,86 @@ static __devinit int max8998_pmic_probe(struct platform_device *pdev)
max8998->iodev = iodev;
max8998->num_regulators = pdata->num_regulators;
platform_set_drvdata(pdev, max8998);
+ i2c = max8998->iodev->i2c;
+
+ /* NOTE: */
+ /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
+ /* will be displayed */
+
+ /* Check if MAX8998 voltage selection GPIOs are defined */
+ if (gpio_is_valid(pdata->buck1_set1) &&
+ gpio_is_valid(pdata->buck1_set2)) {
+ /* Check if SET1 is not equal to 0 */
+ if (!pdata->buck1_set1) {
+ printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
+ WARN_ON(!pdata->buck1_set1);
+ return -EIO;
+ }
+ /* Check if SET2 is not equal to 0 */
+ if (!pdata->buck1_set2) {
+ printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
+ WARN_ON(!pdata->buck1_set2);
+ return -EIO;
+ }
+
+ gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
+ gpio_direction_output(pdata->buck1_set1,
+ max8998->buck1_idx & 0x1);
+
+
+ gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
+ gpio_direction_output(pdata->buck1_set2,
+ (max8998->buck1_idx >> 1) & 0x1);
+ /* Set predefined value for BUCK1 register 1 */
+ i = 0;
+ while (buck12_voltage_map_desc.min +
+ buck12_voltage_map_desc.step*i
+ != (pdata->buck1_max_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);
+
+ /* 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))
+ 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;
+ if (ret)
+ return ret;
+
+ }
+
+ if (gpio_is_valid(pdata->buck2_set3)) {
+ /* Check if SET3 is not equal to 0 */
+ if (!pdata->buck2_set3) {
+ printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
+ WARN_ON(!pdata->buck2_set3);
+ return -EIO;
+ }
+ gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
+ gpio_direction_output(pdata->buck2_set3,
+ max8998->buck2_idx & 0x1);
+
+ /* BUCK2 - set preset default voltage value to buck2_vol[0] */
+ i = 0;
+ while (buck12_voltage_map_desc.min +
+ buck12_voltage_map_desc.step*i
+ != (pdata->buck2_max_voltage / 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;
+
+ }
for (i = 0; i < pdata->num_regulators; i++) {
const struct voltage_map_desc *desc;