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path: root/drivers/regulator/lp3971.c
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Diffstat (limited to 'drivers/regulator/lp3971.c')
-rw-r--r--drivers/regulator/lp3971.c465
1 files changed, 465 insertions, 0 deletions
diff --git a/drivers/regulator/lp3971.c b/drivers/regulator/lp3971.c
new file mode 100644
index 000000000..66fd2330d
--- /dev/null
+++ b/drivers/regulator/lp3971.c
@@ -0,0 +1,465 @@
+/*
+ * Regulator driver for National Semiconductors LP3971 PMIC chip
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Author: Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * Based on wm8350.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/module.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/lp3971.h>
+#include <linux/slab.h>
+
+struct lp3971 {
+ struct device *dev;
+ struct mutex io_lock;
+ struct i2c_client *i2c;
+};
+
+static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
+static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
+
+#define LP3971_SYS_CONTROL1_REG 0x07
+
+/* System control register 1 initial value,
+ bits 4 and 5 are EPROM programmable */
+#define SYS_CONTROL1_INIT_VAL 0x40
+#define SYS_CONTROL1_INIT_MASK 0xCF
+
+#define LP3971_BUCK_VOL_ENABLE_REG 0x10
+#define LP3971_BUCK_VOL_CHANGE_REG 0x20
+
+/* Voltage control registers shift:
+ LP3971_BUCK1 -> 0
+ LP3971_BUCK2 -> 4
+ LP3971_BUCK3 -> 6
+*/
+#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
+#define BUCK_VOL_CHANGE_FLAG_GO 0x01
+#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
+#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
+
+#define LP3971_BUCK1_BASE 0x23
+#define LP3971_BUCK2_BASE 0x29
+#define LP3971_BUCK3_BASE 0x32
+
+static const int buck_base_addr[] = {
+ LP3971_BUCK1_BASE,
+ LP3971_BUCK2_BASE,
+ LP3971_BUCK3_BASE,
+};
+
+#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
+#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
+
+static const unsigned int buck_voltage_map[] = {
+ 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
+ 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
+ 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
+ 3000000, 3300000,
+};
+
+#define BUCK_TARGET_VOL_MASK 0x3f
+
+#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
+
+#define LP3971_LDO_ENABLE_REG 0x12
+#define LP3971_LDO_VOL_CONTR_BASE 0x39
+
+/* Voltage control registers:
+ LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
+ LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
+ LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
+ LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
+ LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
+*/
+#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
+
+/* Voltage control registers shift:
+ LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
+ LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
+ LP3971_LDO5 -> 0
+*/
+#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
+#define LDO_VOL_CONTR_MASK 0x0f
+
+static const unsigned int ldo45_voltage_map[] = {
+ 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
+ 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
+};
+
+static const unsigned int ldo123_voltage_map[] = {
+ 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
+ 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
+};
+
+#define LDO_VOL_MIN_IDX 0x00
+#define LDO_VOL_MAX_IDX 0x0f
+
+static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev) - LP3971_LDO1;
+ u16 mask = 1 << (1 + ldo);
+ u16 val;
+
+ val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
+ return (val & mask) != 0;
+}
+
+static int lp3971_ldo_enable(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev) - LP3971_LDO1;
+ u16 mask = 1 << (1 + ldo);
+
+ return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
+}
+
+static int lp3971_ldo_disable(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev) - LP3971_LDO1;
+ u16 mask = 1 << (1 + ldo);
+
+ return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
+}
+
+static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev) - LP3971_LDO1;
+ u16 val, reg;
+
+ reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
+ val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
+
+ return val;
+}
+
+static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
+ unsigned int selector)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev) - LP3971_LDO1;
+
+ return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
+ LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
+ selector << LDO_VOL_CONTR_SHIFT(ldo));
+}
+
+static struct regulator_ops lp3971_ldo_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .map_voltage = regulator_map_voltage_ascend,
+ .is_enabled = lp3971_ldo_is_enabled,
+ .enable = lp3971_ldo_enable,
+ .disable = lp3971_ldo_disable,
+ .get_voltage_sel = lp3971_ldo_get_voltage_sel,
+ .set_voltage_sel = lp3971_ldo_set_voltage_sel,
+};
+
+static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int buck = rdev_get_id(dev) - LP3971_DCDC1;
+ u16 mask = 1 << (buck * 2);
+ u16 val;
+
+ val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
+ return (val & mask) != 0;
+}
+
+static int lp3971_dcdc_enable(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int buck = rdev_get_id(dev) - LP3971_DCDC1;
+ u16 mask = 1 << (buck * 2);
+
+ return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
+}
+
+static int lp3971_dcdc_disable(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int buck = rdev_get_id(dev) - LP3971_DCDC1;
+ u16 mask = 1 << (buck * 2);
+
+ return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
+}
+
+static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int buck = rdev_get_id(dev) - LP3971_DCDC1;
+ u16 reg;
+
+ reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
+ reg &= BUCK_TARGET_VOL_MASK;
+
+ return reg;
+}
+
+static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
+ unsigned int selector)
+{
+ struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+ int buck = rdev_get_id(dev) - LP3971_DCDC1;
+ int ret;
+
+ ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
+ BUCK_TARGET_VOL_MASK, selector);
+ if (ret)
+ return ret;
+
+ ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
+ BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
+ BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
+ if (ret)
+ return ret;
+
+ return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
+ BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
+ 0 << BUCK_VOL_CHANGE_SHIFT(buck));
+}
+
+static struct regulator_ops lp3971_dcdc_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .map_voltage = regulator_map_voltage_ascend,
+ .is_enabled = lp3971_dcdc_is_enabled,
+ .enable = lp3971_dcdc_enable,
+ .disable = lp3971_dcdc_disable,
+ .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
+ .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
+};
+
+static const struct regulator_desc regulators[] = {
+ {
+ .name = "LDO1",
+ .id = LP3971_LDO1,
+ .ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
+ .volt_table = ldo123_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO2",
+ .id = LP3971_LDO2,
+ .ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
+ .volt_table = ldo123_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO3",
+ .id = LP3971_LDO3,
+ .ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
+ .volt_table = ldo123_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO4",
+ .id = LP3971_LDO4,
+ .ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
+ .volt_table = ldo45_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO5",
+ .id = LP3971_LDO5,
+ .ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
+ .volt_table = ldo45_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "DCDC1",
+ .id = LP3971_DCDC1,
+ .ops = &lp3971_dcdc_ops,
+ .n_voltages = ARRAY_SIZE(buck_voltage_map),
+ .volt_table = buck_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "DCDC2",
+ .id = LP3971_DCDC2,
+ .ops = &lp3971_dcdc_ops,
+ .n_voltages = ARRAY_SIZE(buck_voltage_map),
+ .volt_table = buck_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "DCDC3",
+ .id = LP3971_DCDC3,
+ .ops = &lp3971_dcdc_ops,
+ .n_voltages = ARRAY_SIZE(buck_voltage_map),
+ .volt_table = buck_voltage_map,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int lp3971_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 ret;
+
+ *dest = ret;
+ return 0;
+}
+
+static int lp3971_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 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
+{
+ u16 val = 0;
+
+ mutex_lock(&lp3971->io_lock);
+
+ lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
+
+ dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
+ (unsigned)val&0xff);
+
+ mutex_unlock(&lp3971->io_lock);
+
+ return val & 0xff;
+}
+
+static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
+{
+ u16 tmp;
+ int ret;
+
+ mutex_lock(&lp3971->io_lock);
+
+ ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
+ tmp = (tmp & ~mask) | val;
+ if (ret == 0) {
+ ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
+ dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
+ (unsigned)val&0xff);
+ }
+ mutex_unlock(&lp3971->io_lock);
+
+ return ret;
+}
+
+static int setup_regulators(struct lp3971 *lp3971,
+ struct lp3971_platform_data *pdata)
+{
+ int i, err;
+
+ /* Instantiate the regulators */
+ for (i = 0; i < pdata->num_regulators; i++) {
+ struct regulator_config config = { };
+ struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
+ struct regulator_dev *rdev;
+
+ config.dev = lp3971->dev;
+ config.init_data = reg->initdata;
+ config.driver_data = lp3971;
+
+ rdev = devm_regulator_register(lp3971->dev,
+ &regulators[reg->id], &config);
+ if (IS_ERR(rdev)) {
+ err = PTR_ERR(rdev);
+ dev_err(lp3971->dev, "regulator init failed: %d\n",
+ err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int lp3971_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct lp3971 *lp3971;
+ struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
+ int ret;
+ u16 val;
+
+ if (!pdata) {
+ dev_dbg(&i2c->dev, "No platform init data supplied\n");
+ return -ENODEV;
+ }
+
+ lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
+ if (lp3971 == NULL)
+ return -ENOMEM;
+
+ lp3971->i2c = i2c;
+ lp3971->dev = &i2c->dev;
+
+ mutex_init(&lp3971->io_lock);
+
+ /* Detect LP3971 */
+ ret = lp3971_i2c_read(i2c, LP3971_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");
+ return ret;
+ }
+
+ ret = setup_regulators(lp3971, pdata);
+ if (ret < 0)
+ return ret;
+
+ i2c_set_clientdata(i2c, lp3971);
+ return 0;
+}
+
+static const struct i2c_device_id lp3971_i2c_id[] = {
+ { "lp3971", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
+
+static struct i2c_driver lp3971_i2c_driver = {
+ .driver = {
+ .name = "LP3971",
+ .owner = THIS_MODULE,
+ },
+ .probe = lp3971_i2c_probe,
+ .id_table = lp3971_i2c_id,
+};
+
+module_i2c_driver(lp3971_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
+MODULE_DESCRIPTION("LP3971 PMIC driver");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-20 11:03:58 +0000