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authorAnuj Aggarwal <anuj.aggarwal@ti.com>2009-08-21 00:39:31 +0530
committerLiam Girdwood <lrg@slimlogic.co.uk>2009-09-22 13:32:42 +0100
commit30e6599d317ec83c664f341f18b5b2b57b831a6d (patch)
tree5aa8c0c72440f044dfdf0be5fb98b410a6b4738f /drivers/regulator/tps65023-regulator.c
parente9d62698e8e5228638093c48783eb9dda788f1c3 (diff)
downloadlinaro-lsk-30e6599d317ec83c664f341f18b5b2b57b831a6d.tar.gz
Regulator: Add TPS65023 regulator driver
Adding support for TI TPS65023 regulator driver Signed-off-by: Anuj Aggarwal <anuj.aggarwal@ti.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator/tps65023-regulator.c')
-rw-r--r--drivers/regulator/tps65023-regulator.c631
1 files changed, 631 insertions, 0 deletions
diff --git a/drivers/regulator/tps65023-regulator.c b/drivers/regulator/tps65023-regulator.c
new file mode 100644
index 00000000000..1e54f46af67
--- /dev/null
+++ b/drivers/regulator/tps65023-regulator.c
@@ -0,0 +1,631 @@
+/*
+ * tps65023-regulator.c
+ *
+ * Supports TPS65023 Regulator
+ *
+ * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+
+/* Register definitions */
+#define TPS65023_REG_VERSION 0
+#define TPS65023_REG_PGOODZ 1
+#define TPS65023_REG_MASK 2
+#define TPS65023_REG_REG_CTRL 3
+#define TPS65023_REG_CON_CTRL 4
+#define TPS65023_REG_CON_CTRL2 5
+#define TPS65023_REG_DEF_CORE 6
+#define TPS65023_REG_DEFSLEW 7
+#define TPS65023_REG_LDO_CTRL 8
+
+/* PGOODZ bitfields */
+#define TPS65023_PGOODZ_PWRFAILZ BIT(7)
+#define TPS65023_PGOODZ_LOWBATTZ BIT(6)
+#define TPS65023_PGOODZ_VDCDC1 BIT(5)
+#define TPS65023_PGOODZ_VDCDC2 BIT(4)
+#define TPS65023_PGOODZ_VDCDC3 BIT(3)
+#define TPS65023_PGOODZ_LDO2 BIT(2)
+#define TPS65023_PGOODZ_LDO1 BIT(1)
+
+/* MASK bitfields */
+#define TPS65023_MASK_PWRFAILZ BIT(7)
+#define TPS65023_MASK_LOWBATTZ BIT(6)
+#define TPS65023_MASK_VDCDC1 BIT(5)
+#define TPS65023_MASK_VDCDC2 BIT(4)
+#define TPS65023_MASK_VDCDC3 BIT(3)
+#define TPS65023_MASK_LDO2 BIT(2)
+#define TPS65023_MASK_LDO1 BIT(1)
+
+/* REG_CTRL bitfields */
+#define TPS65023_REG_CTRL_VDCDC1_EN BIT(5)
+#define TPS65023_REG_CTRL_VDCDC2_EN BIT(4)
+#define TPS65023_REG_CTRL_VDCDC3_EN BIT(3)
+#define TPS65023_REG_CTRL_LDO2_EN BIT(2)
+#define TPS65023_REG_CTRL_LDO1_EN BIT(1)
+
+/* LDO_CTRL bitfields */
+#define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id) ((ldo_id)*4)
+#define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id) (0xF0 >> ((ldo_id)*4))
+
+/* Number of step-down converters available */
+#define TPS65023_NUM_DCDC 3
+/* Number of LDO voltage regulators available */
+#define TPS65023_NUM_LDO 2
+/* Number of total regulators available */
+#define TPS65023_NUM_REGULATOR (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
+
+/* DCDCs */
+#define TPS65023_DCDC_1 0
+#define TPS65023_DCDC_2 1
+#define TPS65023_DCDC_3 2
+/* LDOs */
+#define TPS65023_LDO_1 3
+#define TPS65023_LDO_2 4
+
+#define TPS65023_MAX_REG_ID TPS65023_LDO_2
+
+/* Supported voltage values for regulators */
+static const u16 VDCDC1_VSEL_table[] = {
+ 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, 1525, 1550, 1600,
+};
+
+static const u16 LDO1_VSEL_table[] = {
+ 1000, 1100, 1300, 1800,
+ 2200, 2600, 2800, 3150,
+};
+
+static const u16 LDO2_VSEL_table[] = {
+ 1050, 1200, 1300, 1800,
+ 2500, 2800, 3000, 3300,
+};
+
+static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
+ 0, 0, ARRAY_SIZE(LDO1_VSEL_table),
+ ARRAY_SIZE(LDO2_VSEL_table)};
+
+/* Regulator specific details */
+struct tps_info {
+ const char *name;
+ unsigned min_uV;
+ unsigned max_uV;
+ bool fixed;
+ u8 table_len;
+ const u16 *table;
+};
+
+/* PMIC details */
+struct tps_pmic {
+ struct regulator_desc desc[TPS65023_NUM_REGULATOR];
+ struct i2c_client *client;
+ struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
+ const struct tps_info *info[TPS65023_NUM_REGULATOR];
+ struct mutex io_lock;
+};
+
+static inline int tps_65023_read(struct tps_pmic *tps, u8 reg)
+{
+ return i2c_smbus_read_byte_data(tps->client, reg);
+}
+
+static inline int tps_65023_write(struct tps_pmic *tps, u8 reg, u8 val)
+{
+ return i2c_smbus_write_byte_data(tps->client, reg, val);
+}
+
+static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
+{
+ int err, data;
+
+ mutex_lock(&tps->io_lock);
+
+ data = tps_65023_read(tps, reg);
+ if (data < 0) {
+ dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
+ err = data;
+ goto out;
+ }
+
+ data |= mask;
+ err = tps_65023_write(tps, reg, data);
+ if (err)
+ dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
+
+out:
+ mutex_unlock(&tps->io_lock);
+ return err;
+}
+
+static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
+{
+ int err, data;
+
+ mutex_lock(&tps->io_lock);
+
+ data = tps_65023_read(tps, reg);
+ if (data < 0) {
+ dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
+ err = data;
+ goto out;
+ }
+
+ data &= ~mask;
+
+ err = tps_65023_write(tps, reg, data);
+ if (err)
+ dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
+
+out:
+ mutex_unlock(&tps->io_lock);
+ return err;
+
+}
+
+static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
+{
+ int data;
+
+ mutex_lock(&tps->io_lock);
+
+ data = tps_65023_read(tps, reg);
+ if (data < 0)
+ dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
+
+ mutex_unlock(&tps->io_lock);
+ return data;
+}
+
+static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
+{
+ int err;
+
+ mutex_lock(&tps->io_lock);
+
+ err = tps_65023_write(tps, reg, val);
+ if (err < 0)
+ dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
+
+ mutex_unlock(&tps->io_lock);
+ return err;
+}
+
+static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int data, dcdc = rdev_get_id(dev);
+ u8 shift;
+
+ if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+ return -EINVAL;
+
+ shift = TPS65023_NUM_REGULATOR - dcdc;
+ data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
+
+ if (data < 0)
+ return data;
+ else
+ return (data & 1<<shift) ? 1 : 0;
+}
+
+static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int data, ldo = rdev_get_id(dev);
+ u8 shift;
+
+ if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+ return -EINVAL;
+
+ shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
+ data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
+
+ if (data < 0)
+ return data;
+ else
+ return (data & 1<<shift) ? 1 : 0;
+}
+
+static int tps65023_dcdc_enable(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int dcdc = rdev_get_id(dev);
+ u8 shift;
+
+ if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+ return -EINVAL;
+
+ shift = TPS65023_NUM_REGULATOR - dcdc;
+ return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
+}
+
+static int tps65023_dcdc_disable(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int dcdc = rdev_get_id(dev);
+ u8 shift;
+
+ if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+ return -EINVAL;
+
+ shift = TPS65023_NUM_REGULATOR - dcdc;
+ return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
+}
+
+static int tps65023_ldo_enable(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev);
+ u8 shift;
+
+ if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+ return -EINVAL;
+
+ shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
+ return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
+}
+
+static int tps65023_ldo_disable(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev);
+ u8 shift;
+
+ if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+ return -EINVAL;
+
+ shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
+ return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
+}
+
+static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int data, dcdc = rdev_get_id(dev);
+
+ if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+ return -EINVAL;
+
+ if (dcdc == TPS65023_DCDC_1) {
+ data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
+ if (data < 0)
+ return data;
+ data &= (tps->info[dcdc]->table_len - 1);
+ return tps->info[dcdc]->table[data] * 1000;
+ } else
+ return tps->info[dcdc]->min_uV;
+}
+
+static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
+ int min_uV, int max_uV)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int dcdc = rdev_get_id(dev);
+ int vsel;
+
+ if (dcdc != TPS65023_DCDC_1)
+ return -EINVAL;
+
+ if (min_uV < tps->info[dcdc]->min_uV
+ || min_uV > tps->info[dcdc]->max_uV)
+ return -EINVAL;
+ if (max_uV < tps->info[dcdc]->min_uV
+ || max_uV > tps->info[dcdc]->max_uV)
+ return -EINVAL;
+
+ for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
+ int mV = tps->info[dcdc]->table[vsel];
+ int uV = mV * 1000;
+
+ /* Break at the first in-range value */
+ if (min_uV <= uV && uV <= max_uV)
+ break;
+ }
+
+ /* write to the register in case we found a match */
+ if (vsel == tps->info[dcdc]->table_len)
+ return -EINVAL;
+ else
+ return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
+}
+
+static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int data, ldo = rdev_get_id(dev);
+
+ if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+ return -EINVAL;
+
+ data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
+ if (data < 0)
+ return data;
+
+ data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
+ data &= (tps->info[ldo]->table_len - 1);
+ return tps->info[ldo]->table[data] * 1000;
+}
+
+static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
+ int min_uV, int max_uV)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int data, vsel, ldo = rdev_get_id(dev);
+
+ if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+ return -EINVAL;
+
+ if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
+ return -EINVAL;
+ if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
+ return -EINVAL;
+
+ for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
+ int mV = tps->info[ldo]->table[vsel];
+ int uV = mV * 1000;
+
+ /* Break at the first in-range value */
+ if (min_uV <= uV && uV <= max_uV)
+ break;
+ }
+
+ if (vsel == tps->info[ldo]->table_len)
+ return -EINVAL;
+
+ data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
+ if (data < 0)
+ return data;
+
+ data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
+ data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
+ return tps_65023_reg_write(tps, TPS65023_REG_LDO_CTRL, data);
+}
+
+static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
+ unsigned selector)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int dcdc = rdev_get_id(dev);
+
+ if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+ return -EINVAL;
+
+ if (dcdc == TPS65023_DCDC_1) {
+ if (selector >= tps->info[dcdc]->table_len)
+ return -EINVAL;
+ else
+ return tps->info[dcdc]->table[selector] * 1000;
+ } else
+ return tps->info[dcdc]->min_uV;
+}
+
+static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
+ unsigned selector)
+{
+ struct tps_pmic *tps = rdev_get_drvdata(dev);
+ int ldo = rdev_get_id(dev);
+
+ if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+ return -EINVAL;
+
+ if (selector >= tps->info[ldo]->table_len)
+ return -EINVAL;
+ else
+ return tps->info[ldo]->table[selector] * 1000;
+}
+
+/* Operations permitted on VDCDCx */
+static struct regulator_ops tps65023_dcdc_ops = {
+ .is_enabled = tps65023_dcdc_is_enabled,
+ .enable = tps65023_dcdc_enable,
+ .disable = tps65023_dcdc_disable,
+ .get_voltage = tps65023_dcdc_get_voltage,
+ .set_voltage = tps65023_dcdc_set_voltage,
+ .list_voltage = tps65023_dcdc_list_voltage,
+};
+
+/* Operations permitted on LDOx */
+static struct regulator_ops tps65023_ldo_ops = {
+ .is_enabled = tps65023_ldo_is_enabled,
+ .enable = tps65023_ldo_enable,
+ .disable = tps65023_ldo_disable,
+ .get_voltage = tps65023_ldo_get_voltage,
+ .set_voltage = tps65023_ldo_set_voltage,
+ .list_voltage = tps65023_ldo_list_voltage,
+};
+
+static
+int tps_65023_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ static int desc_id;
+ const struct tps_info *info = (void *)id->driver_data;
+ struct regulator_init_data *init_data;
+ struct regulator_dev *rdev;
+ struct tps_pmic *tps;
+ int i;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ /**
+ * init_data points to array of regulator_init structures
+ * coming from the board-evm file.
+ */
+ init_data = client->dev.platform_data;
+
+ if (!init_data)
+ return -EIO;
+
+ tps = kzalloc(sizeof(*tps), GFP_KERNEL);
+ if (!tps)
+ return -ENOMEM;
+
+ mutex_init(&tps->io_lock);
+
+ /* common for all regulators */
+ tps->client = client;
+
+ for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
+ /* Store regulator specific information */
+ tps->info[i] = info;
+
+ tps->desc[i].name = info->name;
+ tps->desc[i].id = desc_id++;
+ tps->desc[i].n_voltages = num_voltages[i];
+ tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
+ &tps65023_ldo_ops : &tps65023_dcdc_ops);
+ tps->desc[i].type = REGULATOR_VOLTAGE;
+ tps->desc[i].owner = THIS_MODULE;
+
+ /* Register the regulators */
+ rdev = regulator_register(&tps->desc[i], &client->dev,
+ init_data, tps);
+ if (IS_ERR(rdev)) {
+ dev_err(&client->dev, "failed to register %s\n",
+ id->name);
+
+ /* Unregister */
+ while (i)
+ regulator_unregister(tps->rdev[--i]);
+
+ tps->client = NULL;
+
+ /* clear the client data in i2c */
+ i2c_set_clientdata(client, NULL);
+ kfree(tps);
+ return PTR_ERR(rdev);
+ }
+
+ /* Save regulator for cleanup */
+ tps->rdev[i] = rdev;
+ }
+
+ i2c_set_clientdata(client, tps);
+
+ return 0;
+}
+
+/**
+ * tps_65023_remove - TPS65023 driver i2c remove handler
+ * @client: i2c driver client device structure
+ *
+ * Unregister TPS driver as an i2c client device driver
+ */
+static int __devexit tps_65023_remove(struct i2c_client *client)
+{
+ struct tps_pmic *tps = i2c_get_clientdata(client);
+ int i;
+
+ for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
+ regulator_unregister(tps->rdev[i]);
+
+ tps->client = NULL;
+
+ /* clear the client data in i2c */
+ i2c_set_clientdata(client, NULL);
+ kfree(tps);
+
+ return 0;
+}
+
+static const struct tps_info tps65023_regs[] = {
+ {
+ .name = "VDCDC1",
+ .min_uV = 800000,
+ .max_uV = 1600000,
+ .table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
+ .table = VDCDC1_VSEL_table,
+ },
+ {
+ .name = "VDCDC2",
+ .min_uV = 3300000,
+ .max_uV = 3300000,
+ .fixed = 1,
+ },
+ {
+ .name = "VDCDC3",
+ .min_uV = 1800000,
+ .max_uV = 1800000,
+ .fixed = 1,
+ },
+ {
+ .name = "LDO1",
+ .min_uV = 1000000,
+ .max_uV = 3150000,
+ .table_len = ARRAY_SIZE(LDO1_VSEL_table),
+ .table = LDO1_VSEL_table,
+ },
+ {
+ .name = "LDO2",
+ .min_uV = 1050000,
+ .max_uV = 3300000,
+ .table_len = ARRAY_SIZE(LDO2_VSEL_table),
+ .table = LDO2_VSEL_table,
+ },
+};
+
+static const struct i2c_device_id tps_65023_id = {
+ .name = "tps65023",
+ .driver_data = (unsigned long) &tps65023_regs[0],
+};
+
+MODULE_DEVICE_TABLE(i2c, tps_65023_id);
+
+static struct i2c_driver tps_65023_i2c_driver = {
+ .driver = {
+ .name = "tps65023",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps_65023_probe,
+ .remove = __devexit_p(tps_65023_remove),
+ .id_table = &tps_65023_id,
+};
+
+/**
+ * tps_65023_init
+ *
+ * Module init function
+ */
+static int __init tps_65023_init(void)
+{
+ return i2c_add_driver(&tps_65023_i2c_driver);
+}
+subsys_initcall(tps_65023_init);
+
+/**
+ * tps_65023_cleanup
+ *
+ * Module exit function
+ */
+static void __exit tps_65023_cleanup(void)
+{
+ i2c_del_driver(&tps_65023_i2c_driver);
+}
+module_exit(tps_65023_cleanup);
+
+MODULE_AUTHOR("Texas Instruments");
+MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
+MODULE_LICENSE("GPLv2");