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>

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 000000000000..1e54f46af674
--- /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");