[PATCH V3] regulator: TPS62360: Add tps62360 regulator driver

[Laxman Dewangan]

From: Laxman Dewangan <ldewangan@xxxxxxxxxx>

The regulator module consists of 1 DCDC. The output voltage
is configurable and is meant for supply power to the core
voltage of Soc.

Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
---
Main changes from patch V1: 
 1. Used the euation for voltage selection in place of lookup table.
 2. Used regmap inplace of direct i2c api for register access.
 3. Removed unimplmented function.
 4. Used devm_kzalloc()

Change from patch V2:
 Added regmap_exit in failing path.

 drivers/regulator/Kconfig              |   10 +
 drivers/regulator/Makefile             |    1 +
 drivers/regulator/tps62360-regulator.c |  317 ++++++++++++++++++++++++++++++++
 include/linux/regulator/tps62360.h     |   49 +++++
 4 files changed, 377 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/tps62360-regulator.c
 create mode 100644 include/linux/regulator/tps62360.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 7a61b17..b9ad3d8 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -328,6 +328,16 @@ config REGULATOR_TPS65910
 	help
 	  This driver supports TPS65910 voltage regulator chips.
 
+config REGULATOR_TPS62360
+	tristate "TI TPS62360 Power Regulator"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  This driver supports TPS62360 voltage regulator chip. This
+	  regulator is meant for processor core supply. This chip is
+	  high-frequency synchronous step down dc-dc converter optimized
+	  for battery-powered portable applications.
+
 config REGULATOR_AAT2870
 	tristate "AnalogicTech AAT2870 Regulators"
 	depends on MFD_AAT2870_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 503bac8..1668b2e 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
 obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
+obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
 obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c
new file mode 100644
index 0000000..30c0615
--- /dev/null
+++ b/drivers/regulator/tps62360-regulator.c
@@ -0,0 +1,317 @@
+/*
+ * tps62360.c -- TI tps62360
+ *
+ * Driver for processor core supply tps62360 and tps62361B
+ *
+ * Copyright (c) 2012, NVIDIA Corporation.
+ *
+ * Author: Laxman Dewangan <ldewangan@xxxxxxxxxx>
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307, USA
+ */
+
+#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/regulator/tps62360.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+
+/* Register definitions */
+#define REG_VSET0		0
+#define REG_VSET1		1
+#define REG_VSET2		2
+#define REG_VSET3		3
+#define REG_CONTROL		4
+#define REG_TEMP		5
+#define REG_RAMPCTRL		6
+#define REG_CHIPID		8
+
+enum chips {TPS62360, TPS62361};
+
+#define TPS62360_BASE_VOLTAGE	770
+#define TPS62360_N_VOLTAGES	64
+
+#define TPS62361_BASE_VOLTAGE	500
+#define TPS62361_N_VOLTAGES	128
+
+/* tps 62360 chip information */
+struct tps62360_chip {
+	const char *name;
+	struct device *dev;
+	struct regulator_desc desc;
+	struct i2c_client *client;
+	struct regulator_dev *rdev;
+	struct regmap *regmap;
+	int chip_id;
+	int vsel_id;
+	int voltage_base;
+	u8 voltage_reg_mask;
+	bool en_internal_pulldn;
+	bool en_force_pwm;
+	bool en_discharge;
+};
+
+static int tps62360_dcdc_get_voltage(struct regulator_dev *dev)
+{
+	struct tps62360_chip *tps = rdev_get_drvdata(dev);
+	int vsel;
+	unsigned int data;
+	int ret;
+
+	ret = regmap_read(tps->regmap, REG_VSET0 + tps->vsel_id, &data);
+	if (ret < 0)
+		return ret;
+	vsel = (int)data & tps->voltage_reg_mask;
+	return (tps->voltage_base + vsel * 10) * 1000;
+}
+
+static int tps62360_dcdc_set_voltage(struct regulator_dev *dev,
+	     int min_uV, int max_uV, unsigned *selector)
+{
+	struct tps62360_chip *tps = rdev_get_drvdata(dev);
+	int vsel;
+	int ret;
+
+	if (max_uV < min_uV)
+		return -EINVAL;
+
+	if (min_uV >
+		((tps->voltage_base + (tps->desc.n_voltages - 1) * 10) * 1000))
+		return -EINVAL;
+
+	if (max_uV < tps->voltage_base * 1000)
+		return -EINVAL;
+
+	vsel = DIV_ROUND_UP(min_uV - (tps->voltage_base * 1000), 10000);
+	if (selector)
+		*selector = (vsel & tps->voltage_reg_mask);
+	ret = regmap_update_bits(tps->regmap, REG_VSET0 + tps->vsel_id,
+				tps->voltage_reg_mask, vsel);
+	if (ret < 0)
+		dev_err(tps->dev, "%s: Error in updating register\n", __func__);
+	return ret;
+}
+
+static int tps62360_dcdc_list_voltage(struct regulator_dev *dev,
+					unsigned selector)
+{
+	struct tps62360_chip *tps = rdev_get_drvdata(dev);
+
+	if ((selector < 0) || (selector >= tps->desc.n_voltages))
+		return -EINVAL;
+	return (tps->voltage_base + selector * 10) * 1000;
+}
+
+static struct regulator_ops tps62360_dcdc_ops = {
+	.get_voltage = tps62360_dcdc_get_voltage,
+	.set_voltage = tps62360_dcdc_set_voltage,
+	.list_voltage = tps62360_dcdc_list_voltage,
+};
+
+static int tps62360_init_dcdc(struct i2c_client *client,
+		struct tps62360_regulator_platform_data *pdata,
+		struct tps62360_chip *tps)
+{
+	int st;
+
+	/* Initailize internal pull up/down control */
+	if (tps->en_internal_pulldn)
+		st = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
+	else
+		st = regmap_write(tps->regmap, REG_CONTROL, 0x0);
+	if (st < 0) {
+		dev_err(tps->dev, "%s() fails in writing reg %d\n",
+			__func__, REG_CONTROL);
+		return st;
+	}
+
+	/* Initailize force PWM mode */
+	if (pdata->en_force_pwm)
+		st = regmap_update_bits(tps->regmap, REG_VSET0 + tps->vsel_id,
+				BIT(7), BIT(7));
+	else
+		st = regmap_update_bits(tps->regmap, REG_VSET0 + tps->vsel_id,
+				BIT(7), 0u);
+	if (st < 0) {
+		dev_err(tps->dev, "%s() fails in updating reg %d\n",
+			__func__, REG_VSET0 + tps->vsel_id);
+		return st;
+	}
+
+	/* Reset output discharge path to reduce power consumption */
+	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
+	if (st < 0)
+		dev_err(tps->dev, "%s() fails in updating reg %d\n",
+			__func__, REG_RAMPCTRL);
+	return st;
+}
+
+static const struct regmap_config tps62360_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int __devinit tps62360_probe(struct i2c_client *client,
+				     const struct i2c_device_id *id)
+{
+	struct tps62360_regulator_platform_data *pdata;
+	struct regulator_init_data *init_data;
+	struct regulator_dev *rdev;
+	struct tps62360_chip *tps;
+	int ret;
+
+	/**
+	 * init_data points to array of regulator_init structures
+	 * coming from the board-evm file.
+	 */
+	pdata = client->dev.platform_data;
+	if (!pdata) {
+		dev_err(&client->dev, "%s() Err: Platform data not found\n",
+						__func__);
+		return -EIO;
+	}
+
+	init_data = &pdata->reg_init_data;
+	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+	if (!tps) {
+		dev_err(&client->dev, "%s() Err: Memory allocation fails\n",
+						__func__);
+		return -ENOMEM;
+	}
+
+	tps->en_force_pwm = pdata->en_force_pwm;
+	tps->en_discharge = pdata->en_discharge;
+	tps->en_internal_pulldn = pdata->en_internal_pulldn;
+	tps->chip_id = id->driver_data;
+	tps->client = client;
+	tps->dev = &client->dev;
+	tps->vsel_id = pdata->vsel;
+	tps->name = id->name;
+	tps->voltage_base = (tps->chip_id == TPS62360) ?
+				TPS62360_BASE_VOLTAGE : TPS62361_BASE_VOLTAGE;
+	tps->voltage_reg_mask = (tps->chip_id == TPS62360) ? 0x3F : 0x7F;
+
+	tps->desc.name = id->name;
+	tps->desc.id = 0;
+	tps->desc.n_voltages = (tps->chip_id == TPS62360) ?
+				TPS62360_N_VOLTAGES : TPS62361_N_VOLTAGES;
+	tps->desc.ops = &tps62360_dcdc_ops;
+	tps->desc.type = REGULATOR_VOLTAGE;
+	tps->desc.owner = THIS_MODULE;
+	tps->regmap = regmap_init_i2c(client, &tps62360_regmap_config);
+	if (IS_ERR(tps->regmap)) {
+		ret = PTR_ERR(tps->regmap);
+		dev_err(&client->dev, "%s() Err: Failed to allocate register"
+			"map: %d\n", __func__, ret);
+		return ret;
+	}
+	i2c_set_clientdata(client, tps);
+
+	ret = tps62360_init_dcdc(client, pdata, tps);
+	if (ret < 0) {
+		dev_err(tps->dev, "%s() Err: Init fails with = %d\n",
+				__func__, ret);
+		goto fail;
+	}
+
+	/* Register the regulators */
+	rdev = regulator_register(&tps->desc, &client->dev,
+			init_data, tps, NULL);
+	if (IS_ERR(rdev)) {
+		dev_err(tps->dev, "%s() Err: Failed to register %s\n",
+				__func__, id->name);
+		ret = PTR_ERR(rdev);
+		goto fail;
+	}
+
+	tps->rdev = rdev;
+	return 0;
+
+fail:
+	regmap_exit(tps->regmap);
+	return ret;
+}
+
+/**
+ * tps62360_remove - tps62360 driver i2c remove handler
+ * @client: i2c driver client device structure
+ *
+ * Unregister TPS driver as an i2c client device driver
+ */
+static int __devexit tps62360_remove(struct i2c_client *client)
+{
+	struct tps62360_chip *tps = i2c_get_clientdata(client);
+
+	regulator_unregister(tps->rdev);
+	regmap_exit(tps->regmap);
+	return 0;
+}
+
+static void tps62360_shutdown(struct i2c_client *client)
+{
+	struct tps62360_chip *tps = i2c_get_clientdata(client);
+	int st;
+
+	if (!tps->en_discharge)
+		return;
+
+	/* Configure the output discharge path */
+	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
+	if (st < 0)
+		dev_err(tps->dev, "%s() fails in updating reg %d\n",
+			__func__, REG_RAMPCTRL);
+}
+
+static const struct i2c_device_id tps62360_id[] = {
+	{.name = "tps62360", .driver_data = TPS62360},
+	{.name = "tps62361", .driver_data = TPS62361},
+	{},
+};
+
+MODULE_DEVICE_TABLE(i2c, tps62360_id);
+
+static struct i2c_driver tps62360_i2c_driver = {
+	.driver = {
+		.name = "tps62360",
+		.owner = THIS_MODULE,
+	},
+	.probe = tps62360_probe,
+	.remove = __devexit_p(tps62360_remove),
+	.shutdown = tps62360_shutdown,
+	.id_table = tps62360_id,
+};
+
+static int __init tps62360_init(void)
+{
+	return i2c_add_driver(&tps62360_i2c_driver);
+}
+subsys_initcall(tps62360_init);
+
+static void __exit tps62360_cleanup(void)
+{
+	i2c_del_driver(&tps62360_i2c_driver);
+}
+module_exit(tps62360_cleanup);
+
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@xxxxxxxxxx>");
+MODULE_DESCRIPTION("TPS62360 voltage regulator driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regulator/tps62360.h b/include/linux/regulator/tps62360.h
new file mode 100644
index 0000000..2b28190
--- /dev/null
+++ b/include/linux/regulator/tps62360.h
@@ -0,0 +1,49 @@
+/*
+ * tps62360.h -- TI tps62360
+ *
+ * Interface for regulator driver for TI TPS62360 Processor core supply
+ *
+ * Copyright (C) 2012 NVIDIA Corporation
+
+ * Author: Laxman Dewangan <ldewangan@xxxxxxxxxx>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA	02110-1301, USA.
+ *
+ */
+
+#ifndef __LINUX_REGULATOR_TPS62360_H
+#define __LINUX_REGULATOR_TPS62360_H
+
+#include <linux/regulator/machine.h>
+
+/*
+ * struct tps62360_regulator_platform_data - tps62360 regulator platform data.
+ *
+ * @reg_init_data: The regulator init data.
+ * @en_force_pwm: Enable force pwm or not.
+ * @en_discharge: Enable discharge the output capacitor via internal register.
+ * @en_internal_pulldn: internal pull down enable or not.
+ * @vsel: Select the voltage id register.
+ */
+
+struct tps62360_regulator_platform_data {
+	struct regulator_init_data reg_init_data;
+	bool en_force_pwm;
+	bool en_discharge;
+	bool en_internal_pulldn;
+	int vsel;
+};
+
+#endif /* __LINUX_REGULATOR_TPS62360_H */
-- 
1.7.1.1

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