Regulator: LP3972 PMIC regulator driver
Axel Lin [Thu, 16 Sep 2010 08:48:49 +0000 (16:48 +0800)]
This patch adds regulator drivers for National Semiconductors LP3972 PMIC.
This LP3972 PMIC controller has 3 DC/DC voltage converters and 5 low drop-out
(LDO) regulators. LP3972 PMIC controller uses I2C interface.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/lp3972.c [new file with mode: 0644]
include/linux/regulator/lp3972.h [new file with mode: 0644]

index 4889caa..dd30e88 100644 (file)
@@ -172,6 +172,13 @@ config REGULATOR_LP3971
         Say Y here to support the voltage regulators and convertors
         on National Semiconductors LP3971 PMIC
 
+config REGULATOR_LP3972
+       tristate "National Semiconductors LP3972 PMIC regulator driver"
+       depends on I2C
+       help
+        Say Y here to support the voltage regulators and convertors
+        on National Semiconductors LP3972 PMIC
+
 config REGULATOR_PCAP
        tristate "PCAP2 regulator driver"
        depends on EZX_PCAP
index beff6da..6cae641 100644 (file)
@@ -12,6 +12,7 @@ obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
 obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o
 obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
+obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
 obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8649)        += max8649.o
diff --git a/drivers/regulator/lp3972.c b/drivers/regulator/lp3972.c
new file mode 100644 (file)
index 0000000..0d9b475
--- /dev/null
@@ -0,0 +1,649 @@
+/*
+ * Regulator driver for National Semiconductors LP3972 PMIC chip
+ *
+ * Based on lp3971.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/lp3972.h>
+#include <linux/slab.h>
+
+struct lp3972 {
+       struct device *dev;
+       struct mutex io_lock;
+       struct i2c_client *i2c;
+       int num_regulators;
+       struct regulator_dev **rdev;
+};
+
+/* LP3972 Control Registers */
+#define LP3972_SCR_REG         0x07
+#define LP3972_OVER1_REG       0x10
+#define LP3972_OVSR1_REG       0x11
+#define LP3972_OVER2_REG       0x12
+#define LP3972_OVSR2_REG       0x13
+#define LP3972_VCC1_REG                0x20
+#define LP3972_ADTV1_REG       0x23
+#define LP3972_ADTV2_REG       0x24
+#define LP3972_AVRC_REG                0x25
+#define LP3972_CDTC1_REG       0x26
+#define LP3972_CDTC2_REG       0x27
+#define LP3972_SDTV1_REG       0x29
+#define LP3972_SDTV2_REG       0x2A
+#define LP3972_MDTV1_REG       0x32
+#define LP3972_MDTV2_REG       0x33
+#define LP3972_L2VCR_REG       0x39
+#define LP3972_L34VCR_REG      0x3A
+#define LP3972_SCR1_REG                0x80
+#define LP3972_SCR2_REG                0x81
+#define LP3972_OEN3_REG                0x82
+#define LP3972_OSR3_REG                0x83
+#define LP3972_LOER4_REG       0x84
+#define LP3972_B2TV_REG                0x85
+#define LP3972_B3TV_REG                0x86
+#define LP3972_B32RC_REG       0x87
+#define LP3972_ISRA_REG                0x88
+#define LP3972_BCCR_REG                0x89
+#define LP3972_II1RR_REG       0x8E
+#define LP3972_II2RR_REG       0x8F
+
+#define LP3972_SYS_CONTROL1_REG                LP3972_SCR1_REG
+/* System control register 1 initial value,
+ * bits 5, 6 and 7 are EPROM programmable */
+#define SYS_CONTROL1_INIT_VAL          0x02
+#define SYS_CONTROL1_INIT_MASK         0x1F
+
+#define LP3972_VOL_CHANGE_REG          LP3972_VCC1_REG
+#define LP3972_VOL_CHANGE_FLAG_GO      0x01
+#define LP3972_VOL_CHANGE_FLAG_MASK    0x03
+
+/* LDO output enable mask */
+#define LP3972_OEN3_L1EN       BIT(0)
+#define LP3972_OVER2_LDO2_EN   BIT(2)
+#define LP3972_OVER2_LDO3_EN   BIT(3)
+#define LP3972_OVER2_LDO4_EN   BIT(4)
+#define LP3972_OVER1_S_EN      BIT(2)
+
+static const int ldo1_voltage_map[] = {
+       1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
+       1900, 1925, 1950, 1975, 2000,
+};
+
+static const int ldo23_voltage_map[] = {
+       1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
+       2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
+};
+
+static const int ldo4_voltage_map[] = {
+       1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
+       1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
+};
+
+static const int ldo5_voltage_map[] = {
+          0,    0,    0,    0,    0,  850,  875,  900,
+        925,  950,  975, 1000, 1025, 1050, 1075, 1100,
+       1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
+       1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
+};
+
+static const int buck1_voltage_map[] = {
+        725,  750,  775,  800,  825,  850,  875,  900,
+        925,  950,  975, 1000, 1025, 1050, 1075, 1100,
+       1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
+       1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
+};
+
+static const int buck23_voltage_map[] = {
+          0,  800,  850,  900,  950, 1000, 1050, 1100,
+       1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
+       1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
+       3000, 3300,
+};
+
+static const int *ldo_voltage_map[] = {
+       ldo1_voltage_map,
+       ldo23_voltage_map,
+       ldo23_voltage_map,
+       ldo4_voltage_map,
+       ldo5_voltage_map,
+};
+
+static const int *buck_voltage_map[] = {
+       buck1_voltage_map,
+       buck23_voltage_map,
+       buck23_voltage_map,
+};
+
+static const int ldo_output_enable_mask[] = {
+       LP3972_OEN3_L1EN,
+       LP3972_OVER2_LDO2_EN,
+       LP3972_OVER2_LDO3_EN,
+       LP3972_OVER2_LDO4_EN,
+       LP3972_OVER1_S_EN,
+};
+
+static const int ldo_output_enable_addr[] = {
+       LP3972_OEN3_REG,
+       LP3972_OVER2_REG,
+       LP3972_OVER2_REG,
+       LP3972_OVER2_REG,
+       LP3972_OVER1_REG,
+};
+
+static const int ldo_vol_ctl_addr[] = {
+       LP3972_MDTV1_REG,
+       LP3972_L2VCR_REG,
+       LP3972_L34VCR_REG,
+       LP3972_L34VCR_REG,
+       LP3972_SDTV1_REG,
+};
+
+static const int buck_vol_enable_addr[] = {
+       LP3972_OVER1_REG,
+       LP3972_OEN3_REG,
+       LP3972_OEN3_REG,
+};
+
+static const int buck_base_addr[] = {
+       LP3972_ADTV1_REG,
+       LP3972_B2TV_REG,
+       LP3972_B3TV_REG,
+};
+
+#define LP3972_LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[x])
+#define LP3972_LDO_OUTPUT_ENABLE_MASK(x) (ldo_output_enable_mask[x])
+#define LP3972_LDO_OUTPUT_ENABLE_REG(x) (ldo_output_enable_addr[x])
+
+/*     LDO voltage control registers shift:
+       LP3972_LDO1 -> 0, LP3972_LDO2 -> 4
+       LP3972_LDO3 -> 0, LP3972_LDO4 -> 4
+       LP3972_LDO5 -> 0
+*/
+#define LP3972_LDO_VOL_CONTR_SHIFT(x) (((x) & 1) << 2)
+#define LP3972_LDO_VOL_CONTR_REG(x) (ldo_vol_ctl_addr[x])
+#define LP3972_LDO_VOL_CHANGE_SHIFT(x) ((x) ? 4 : 6)
+
+#define LP3972_LDO_VOL_MASK(x) (((x) % 4) ? 0x0f : 0x1f)
+#define LP3972_LDO_VOL_MIN_IDX(x) (((x) == 4) ? 0x05 : 0x00)
+#define LP3972_LDO_VOL_MAX_IDX(x) ((x) ? (((x) == 4) ? 0x1f : 0x0f) : 0x0c)
+
+#define LP3972_BUCK_VOL_VALUE_MAP(x) (buck_voltage_map[x])
+#define LP3972_BUCK_VOL_ENABLE_REG(x) (buck_vol_enable_addr[x])
+#define LP3972_BUCK_VOL1_REG(x) (buck_base_addr[x])
+#define LP3972_BUCK_VOL_MASK 0x1f
+#define LP3972_BUCK_VOL_MIN_IDX(x) ((x) ? 0x01 : 0x00)
+#define LP3972_BUCK_VOL_MAX_IDX(x) ((x) ? 0x19 : 0x1f)
+
+static int lp3972_i2c_read(struct i2c_client *i2c, char reg, int count,
+       u16 *dest)
+{
+       int ret;
+
+       if (count != 1)
+               return -EIO;
+       ret = i2c_smbus_read_byte_data(i2c, reg);
+       if (ret < 0)
+               return -EIO;
+
+       *dest = ret;
+       return 0;
+}
+
+static int lp3972_i2c_write(struct i2c_client *i2c, char reg, int count,
+       const u16 *src)
+{
+       if (count != 1)
+               return -EIO;
+       return i2c_smbus_write_byte_data(i2c, reg, *src);
+}
+
+static u8 lp3972_reg_read(struct lp3972 *lp3972, u8 reg)
+{
+       u16 val = 0;
+
+       mutex_lock(&lp3972->io_lock);
+
+       lp3972_i2c_read(lp3972->i2c, reg, 1, &val);
+
+       dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
+               (unsigned)val&0xff);
+
+       mutex_unlock(&lp3972->io_lock);
+
+       return val & 0xff;
+}
+
+static int lp3972_set_bits(struct lp3972 *lp3972, u8 reg, u16 mask, u16 val)
+{
+       u16 tmp;
+       int ret;
+
+       mutex_lock(&lp3972->io_lock);
+
+       ret = lp3972_i2c_read(lp3972->i2c, reg, 1, &tmp);
+       tmp = (tmp & ~mask) | val;
+       if (ret == 0) {
+               ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp);
+               dev_dbg(lp3972->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
+                       (unsigned)val&0xff);
+       }
+       mutex_unlock(&lp3972->io_lock);
+
+       return ret;
+}
+
+static int lp3972_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
+{
+       int ldo = rdev_get_id(dev) - LP3972_LDO1;
+       return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[index];
+}
+
+static int lp3972_ldo_is_enabled(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int ldo = rdev_get_id(dev) - LP3972_LDO1;
+       u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
+       u16 val;
+
+       val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo));
+       return !!(val & mask);
+}
+
+static int lp3972_ldo_enable(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int ldo = rdev_get_id(dev) - LP3972_LDO1;
+       u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
+
+       return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo),
+                               mask, mask);
+}
+
+static int lp3972_ldo_disable(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int ldo = rdev_get_id(dev) - LP3972_LDO1;
+       u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
+
+       return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo),
+                               mask, 0);
+}
+
+static int lp3972_ldo_get_voltage(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int ldo = rdev_get_id(dev) - LP3972_LDO1;
+       u16 mask = LP3972_LDO_VOL_MASK(ldo);
+       u16 val, reg;
+
+       reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo));
+       val = (reg >> LP3972_LDO_VOL_CONTR_SHIFT(ldo)) & mask;
+
+       return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[val];
+}
+
+static int lp3972_ldo_set_voltage(struct regulator_dev *dev,
+                                 int min_uV, int max_uV)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int ldo = rdev_get_id(dev) - LP3972_LDO1;
+       int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
+       const int *vol_map = LP3972_LDO_VOL_VALUE_MAP(ldo);
+       u16 val;
+       int shift, ret;
+
+       if (min_vol < vol_map[LP3972_LDO_VOL_MIN_IDX(ldo)] ||
+           min_vol > vol_map[LP3972_LDO_VOL_MAX_IDX(ldo)])
+               return -EINVAL;
+
+       for (val = LP3972_LDO_VOL_MIN_IDX(ldo);
+               val <= LP3972_LDO_VOL_MAX_IDX(ldo); val++)
+               if (vol_map[val] >= min_vol)
+                       break;
+
+       if (val > LP3972_LDO_VOL_MAX_IDX(ldo) || vol_map[val] > max_vol)
+               return -EINVAL;
+
+       shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo);
+       ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo),
+               LP3972_LDO_VOL_MASK(ldo) << shift, val << shift);
+
+       if (ret)
+               return ret;
+
+       switch (ldo) {
+       case LP3972_LDO1:
+       case LP3972_LDO5:
+               shift = LP3972_LDO_VOL_CHANGE_SHIFT(ldo);
+               ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+                       LP3972_VOL_CHANGE_FLAG_MASK << shift,
+                       LP3972_VOL_CHANGE_FLAG_GO << shift);
+               if (ret)
+                       return ret;
+
+               ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+                       LP3972_VOL_CHANGE_FLAG_MASK << shift, 0);
+               break;
+       }
+
+       return ret;
+}
+
+static struct regulator_ops lp3972_ldo_ops = {
+       .list_voltage = lp3972_ldo_list_voltage,
+       .is_enabled = lp3972_ldo_is_enabled,
+       .enable = lp3972_ldo_enable,
+       .disable = lp3972_ldo_disable,
+       .get_voltage = lp3972_ldo_get_voltage,
+       .set_voltage = lp3972_ldo_set_voltage,
+};
+
+static int lp3972_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
+{
+       int buck = rdev_get_id(dev) - LP3972_DCDC1;
+       return 1000 * buck_voltage_map[buck][index];
+}
+
+static int lp3972_dcdc_is_enabled(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int buck = rdev_get_id(dev) - LP3972_DCDC1;
+       u16 mask = 1 << (buck * 2);
+       u16 val;
+
+       val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck));
+       return !!(val & mask);
+}
+
+static int lp3972_dcdc_enable(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int buck = rdev_get_id(dev) - LP3972_DCDC1;
+       u16 mask = 1 << (buck * 2);
+       u16 val;
+
+       val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
+                               mask, mask);
+       return val;
+}
+
+static int lp3972_dcdc_disable(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int buck = rdev_get_id(dev) - LP3972_DCDC1;
+       u16 mask = 1 << (buck * 2);
+       u16 val;
+
+       val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
+                               mask, 0);
+       return val;
+}
+
+static int lp3972_dcdc_get_voltage(struct regulator_dev *dev)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int buck = rdev_get_id(dev) - LP3972_DCDC1;
+       u16 reg;
+       int val;
+
+       reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck));
+       reg &= LP3972_BUCK_VOL_MASK;
+       if (reg <= LP3972_BUCK_VOL_MAX_IDX(buck))
+               val = 1000 * buck_voltage_map[buck][reg];
+       else {
+               val = 0;
+               dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
+       }
+
+       return val;
+}
+
+static int lp3972_dcdc_set_voltage(struct regulator_dev *dev,
+                                 int min_uV, int max_uV)
+{
+       struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+       int buck = rdev_get_id(dev) - LP3972_DCDC1;
+       int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
+       const int *vol_map = buck_voltage_map[buck];
+       u16 val;
+       int ret;
+
+       if (min_vol < vol_map[LP3972_BUCK_VOL_MIN_IDX(buck)] ||
+           min_vol > vol_map[LP3972_BUCK_VOL_MAX_IDX(buck)])
+               return -EINVAL;
+
+       for (val = LP3972_BUCK_VOL_MIN_IDX(buck);
+               val <= LP3972_BUCK_VOL_MAX_IDX(buck); val++)
+               if (vol_map[val] >= min_vol)
+                       break;
+
+       if (val > LP3972_BUCK_VOL_MAX_IDX(buck) ||
+           vol_map[val] > max_vol)
+               return -EINVAL;
+
+       ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck),
+                               LP3972_BUCK_VOL_MASK, val);
+       if (ret)
+               return ret;
+
+       if (buck != 0)
+               return ret;
+
+       ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+               LP3972_VOL_CHANGE_FLAG_MASK, LP3972_VOL_CHANGE_FLAG_GO);
+       if (ret)
+               return ret;
+
+       return lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+                               LP3972_VOL_CHANGE_FLAG_MASK, 0);
+}
+
+static struct regulator_ops lp3972_dcdc_ops = {
+       .list_voltage = lp3972_dcdc_list_voltage,
+       .is_enabled = lp3972_dcdc_is_enabled,
+       .enable = lp3972_dcdc_enable,
+       .disable = lp3972_dcdc_disable,
+       .get_voltage = lp3972_dcdc_get_voltage,
+       .set_voltage = lp3972_dcdc_set_voltage,
+};
+
+static struct regulator_desc regulators[] = {
+       {
+               .name = "LDO1",
+               .id = LP3972_LDO1,
+               .ops = &lp3972_ldo_ops,
+               .n_voltages = ARRAY_SIZE(ldo1_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "LDO2",
+               .id = LP3972_LDO2,
+               .ops = &lp3972_ldo_ops,
+               .n_voltages = ARRAY_SIZE(ldo23_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "LDO3",
+               .id = LP3972_LDO3,
+               .ops = &lp3972_ldo_ops,
+               .n_voltages = ARRAY_SIZE(ldo23_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "LDO4",
+               .id = LP3972_LDO4,
+               .ops = &lp3972_ldo_ops,
+               .n_voltages = ARRAY_SIZE(ldo4_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "LDO5",
+               .id = LP3972_LDO5,
+               .ops = &lp3972_ldo_ops,
+               .n_voltages = ARRAY_SIZE(ldo5_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "DCDC1",
+               .id = LP3972_DCDC1,
+               .ops = &lp3972_dcdc_ops,
+               .n_voltages = ARRAY_SIZE(buck1_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "DCDC2",
+               .id = LP3972_DCDC2,
+               .ops = &lp3972_dcdc_ops,
+               .n_voltages = ARRAY_SIZE(buck23_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+       {
+               .name = "DCDC3",
+               .id = LP3972_DCDC3,
+               .ops = &lp3972_dcdc_ops,
+               .n_voltages = ARRAY_SIZE(buck23_voltage_map),
+               .type = REGULATOR_VOLTAGE,
+               .owner = THIS_MODULE,
+       },
+};
+
+static int setup_regulators(struct lp3972 *lp3972,
+       struct lp3972_platform_data *pdata)
+{
+       int i, err;
+
+       lp3972->num_regulators = pdata->num_regulators;
+       lp3972->rdev = kcalloc(pdata->num_regulators,
+                               sizeof(struct regulator_dev *), GFP_KERNEL);
+       if (!lp3972->rdev) {
+               err = -ENOMEM;
+               goto err_nomem;
+       }
+
+       /* Instantiate the regulators */
+       for (i = 0; i < pdata->num_regulators; i++) {
+               struct lp3972_regulator_subdev *reg = &pdata->regulators[i];
+               lp3972->rdev[i] = regulator_register(&regulators[reg->id],
+                                       lp3972->dev, reg->initdata, lp3972);
+
+               if (IS_ERR(lp3972->rdev[i])) {
+                       err = PTR_ERR(lp3972->rdev[i]);
+                       dev_err(lp3972->dev, "regulator init failed: %d\n",
+                               err);
+                       goto error;
+               }
+       }
+
+       return 0;
+error:
+       while (--i >= 0)
+               regulator_unregister(lp3972->rdev[i]);
+       kfree(lp3972->rdev);
+       lp3972->rdev = NULL;
+err_nomem:
+       return err;
+}
+
+static int __devinit lp3972_i2c_probe(struct i2c_client *i2c,
+                           const struct i2c_device_id *id)
+{
+       struct lp3972 *lp3972;
+       struct lp3972_platform_data *pdata = i2c->dev.platform_data;
+       int ret;
+       u16 val;
+
+       if (!pdata) {
+               dev_dbg(&i2c->dev, "No platform init data supplied\n");
+               return -ENODEV;
+       }
+
+       lp3972 = kzalloc(sizeof(struct lp3972), GFP_KERNEL);
+       if (!lp3972)
+               return -ENOMEM;
+
+       lp3972->i2c = i2c;
+       lp3972->dev = &i2c->dev;
+
+       mutex_init(&lp3972->io_lock);
+
+       /* Detect LP3972 */
+       ret = lp3972_i2c_read(i2c, LP3972_SYS_CONTROL1_REG, 1, &val);
+       if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
+               ret = -ENODEV;
+       if (ret < 0) {
+               dev_err(&i2c->dev, "failed to detect device\n");
+               goto err_detect;
+       }
+
+       ret = setup_regulators(lp3972, pdata);
+       if (ret < 0)
+               goto err_detect;
+
+       i2c_set_clientdata(i2c, lp3972);
+       return 0;
+
+err_detect:
+       kfree(lp3972);
+       return ret;
+}
+
+static int __devexit lp3972_i2c_remove(struct i2c_client *i2c)
+{
+       struct lp3972 *lp3972 = i2c_get_clientdata(i2c);
+       int i;
+
+       for (i = 0; i < lp3972->num_regulators; i++)
+               regulator_unregister(lp3972->rdev[i]);
+       kfree(lp3972->rdev);
+       kfree(lp3972);
+
+       return 0;
+}
+
+static const struct i2c_device_id lp3972_i2c_id[] = {
+       { "lp3972", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, lp3972_i2c_id);
+
+static struct i2c_driver lp3972_i2c_driver = {
+       .driver = {
+               .name = "lp3972",
+               .owner = THIS_MODULE,
+       },
+       .probe    = lp3972_i2c_probe,
+       .remove   = __devexit_p(lp3972_i2c_remove),
+       .id_table = lp3972_i2c_id,
+};
+
+static int __init lp3972_module_init(void)
+{
+       return i2c_add_driver(&lp3972_i2c_driver);
+}
+subsys_initcall(lp3972_module_init);
+
+static void __exit lp3972_module_exit(void)
+{
+       i2c_del_driver(&lp3972_i2c_driver);
+}
+module_exit(lp3972_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Axel Lin <axel.lin@gmail.com>");
+MODULE_DESCRIPTION("LP3972 PMIC driver");
diff --git a/include/linux/regulator/lp3972.h b/include/linux/regulator/lp3972.h
new file mode 100644 (file)
index 0000000..9bb7389
--- /dev/null
@@ -0,0 +1,48 @@
+/*
+ * National Semiconductors LP3972 PMIC chip client interface
+ *
+ * Based on lp3971.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __LINUX_REGULATOR_LP3972_H
+#define __LINUX_REGULATOR_LP3972_H
+
+#include <linux/regulator/machine.h>
+
+#define LP3972_LDO1  0
+#define LP3972_LDO2  1
+#define LP3972_LDO3  2
+#define LP3972_LDO4  3
+#define LP3972_LDO5  4
+
+#define LP3972_DCDC1 5
+#define LP3972_DCDC2 6
+#define LP3972_DCDC3 7
+
+#define LP3972_NUM_REGULATORS 8
+
+struct lp3972_regulator_subdev {
+       int id;
+       struct regulator_init_data *initdata;
+};
+
+struct lp3972_platform_data {
+       int num_regulators;
+       struct lp3972_regulator_subdev *regulators;
+};
+
+#endif