[PATCH 1/8] Regulator: Add TPS65023 regulator driver

[Anuj Aggarwal]

Adding support for TI TPS65023 regulator driver

Signed-off-by: Anuj Aggarwal <anuj.aggarwal@xxxxxx>
---
 drivers/regulator/tps65023-regulator.c |  496 ++++++++++++++++++++++++++++++++
 1 files changed, 496 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/tps65023-regulator.c

diff --git a/drivers/regulator/tps65023-regulator.c b/drivers/regulator/tps65023-regulator.c
new file mode 100644
index 0000000..d112cbc
--- /dev/null
+++ b/drivers/regulator/tps65023-regulator.c
@@ -0,0 +1,496 @@
+/*
+ * 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>
+#include <linux/regulator/tps65023.h>
+
+struct tps_info {
+	const char *name;
+	unsigned min_uV;
+	unsigned max_uV;
+	bool fixed;
+	u8 table_len;
+	const u16 *table;
+};
+
+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];
+};
+
+static inline int tps_65023_read_reg(struct tps_pmic *tps, u8 reg, u8 *val)
+{
+	int status;
+
+	status = i2c_smbus_read_byte_data(tps->client, reg);
+	*val = status;
+	if (status < 0)
+		return status;
+	return 0;
+}
+
+static inline int tps_65023_write_reg(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)
+{
+	u8 data;
+	int err;
+
+	err = tps_65023_read_reg(tps, reg, &data);
+	if (err) {
+		pr_err("Read from reg 0x%x failed\n", reg);
+		return err;
+	}
+
+	data |= mask;
+
+	return tps_65023_write_reg(tps, reg, data);
+}
+
+static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
+{
+	u8 data;
+	int err;
+
+	err = tps_65023_read_reg(tps, reg, &data);
+	if (err) {
+		pr_err("Read from reg 0x%x failed\n", reg);
+		return err;
+	}
+
+	data &= ~mask;
+
+	return tps_65023_write_reg(tps, reg, data);
+}
+
+static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
+{
+	unsigned char reg_ctrl;
+	struct tps_pmic *tps = rdev_get_drvdata(dev);
+	int dcdc = rdev_get_id(dev);
+	int ret;
+	u8 shift;
+
+	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+		return -EINVAL;
+
+	shift = TPS65023_NUM_REGULATOR - dcdc;
+	ret = tps_65023_read_reg(tps, TPS65023_REG_REG_CTRL, &reg_ctrl);
+
+	if (ret == 0) {
+		reg_ctrl &= (1 << shift);
+		return reg_ctrl ? 1 : 0;
+	} else
+		return ret;
+}
+
+static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
+{
+	struct tps_pmic *tps = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev);
+	int ret;
+	u8 shift;
+	unsigned char reg_ctrl;
+
+	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+		return -EINVAL;
+
+	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
+	ret = tps_65023_read_reg(tps, TPS65023_REG_REG_CTRL, &reg_ctrl);
+
+	if (ret == 0) {
+		reg_ctrl &= (1 << shift);
+		return reg_ctrl ? 1 : 0;
+	} else
+		return ret;
+}
+
+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)
+{
+	unsigned char reg_ctrl;
+	struct tps_pmic *tps = rdev_get_drvdata(dev);
+	int dcdc = rdev_get_id(dev);
+	int ret;
+
+	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
+		return -EINVAL;
+
+	if (dcdc == TPS65023_DCDC_1) {
+		ret = tps_65023_read_reg(tps, TPS65023_REG_DEF_CORE, &reg_ctrl);
+		if (ret < 0)
+			return ret;
+		reg_ctrl &= (tps->info[dcdc]->table_len - 1);
+		return tps->info[dcdc]->table[reg_ctrl] * 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 */
+	return tps_65023_write_reg(tps, TPS65023_REG_DEF_CORE, vsel);
+}
+
+static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
+{
+	unsigned char reg_ctrl;
+	struct tps_pmic *tps = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev);
+	int ret;
+
+	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
+		return -EINVAL;
+
+	ret = tps_65023_read_reg(tps, TPS65023_REG_LDO_CTRL, &reg_ctrl);
+	if (ret < 0)
+		return ret;
+
+	reg_ctrl >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
+	reg_ctrl &= (tps->info[ldo]->table_len - 1);
+	return tps->info[ldo]->table[reg_ctrl] * 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 ldo = rdev_get_id(dev);
+	int vsel;
+	int ret;
+	unsigned char reg_ctrl;
+
+	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;
+	}
+
+	ret = tps_65023_read_reg(tps, TPS65023_REG_LDO_CTRL, &reg_ctrl);
+
+	if (ret < 0)
+		return ret;
+
+	reg_ctrl &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
+	reg_ctrl |= 
+		(vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
+	return tps_65023_write_reg(tps, TPS65023_REG_LDO_CTRL, reg_ctrl);
+}
+
+/* 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,
+};
+
+/* 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,
+};
+
+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;
+
+	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].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);
+			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;
+}
+
+/* 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 const struct tps_info tps65023_regs[] = {
+	{
+	.name = "VDCDC1",
+	.min_uV =  800000,
+	.max_uV = 1600000,
+	.fixed = 0,
+	.table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
+	.table = VDCDC1_VSEL_table,
+	},
+	{
+	.name = "VDCDC2",
+	.min_uV =  3300000,
+	.max_uV = 3300000,
+	.fixed = 1,
+	.table_len = 0,
+	},
+	{
+	.name = "VDCDC3",
+	.min_uV =  1800000,
+	.max_uV = 1800000,
+	.fixed = 1,
+	.table_len = 0,
+	},
+	{
+	.name = "LDO1",
+	.min_uV = 1000000,
+	.max_uV = 3150000,
+	.fixed = 0,
+	.table_len = ARRAY_SIZE(LDO1_VSEL_table),
+	.table = LDO1_VSEL_table,
+	},
+	{
+	.name = "LDO2",
+	.min_uV = 1050000,
+	.max_uV = 3300000,
+	.fixed = 0,
+	.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 = "tps_65023_pwr",
+		.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");
-- 
1.6.2.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/