regulator: pv88090: new regulator driver

This is the driver for the Powerventure PV88090 BUCKs and LDOs regulator.
It communicates via an I2C bus to the device.

Signed-off-by: James Ban <James.Ban.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 458 insertions, 0 deletions

diff --git a/drivers/regulator/pv88090-regulator.c b/drivers/regulator/pv88090-regulator.c
new file mode 100644
index 000000000000..3ec5f2bdfc51
--- /dev/null
+++ b/drivers/regulator/pv88090-regulator.c
@@ -0,0 +1,458 @@
+/*
+ * pv88090-regulator.c - Regulator device driver for PV88090
+ * Copyright (C) 2015  Powerventure Semiconductor Ltd.
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regmap.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include "pv88090-regulator.h"
+
+#define PV88090_MAX_REGULATORS	5
+
+/* PV88090 REGULATOR IDs */
+enum {
+	/* BUCKs */
+	PV88090_ID_BUCK1,
+	PV88090_ID_BUCK2,
+	PV88090_ID_BUCK3,
+
+	/* LDOs */
+	PV88090_ID_LDO1,
+	PV88090_ID_LDO2,
+};
+
+struct pv88090_regulator {
+	struct regulator_desc desc;
+	/* Current limiting */
+	unsigned	n_current_limits;
+	const int	*current_limits;
+	unsigned int limit_mask;
+	unsigned int conf;
+	unsigned int conf2;
+};
+
+struct pv88090 {
+	struct device *dev;
+	struct regmap *regmap;
+	struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
+};
+
+struct pv88090_buck_voltage {
+	int min_uV;
+	int max_uV;
+	int uV_step;
+};
+
+static const struct regmap_config pv88090_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
+ *  Entry indexes corresponds to register values.
+ */
+
+static const int pv88090_buck1_limits[] = {
+	 220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
+	1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
+	3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
+	5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
+};
+
+static const int pv88090_buck23_limits[] = {
+	1496000, 2393000, 3291000, 4189000
+};
+
+static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
+	{
+		.min_uV = 600000,
+		.max_uV = 1393750,
+		.uV_step = 6250,
+	},
+
+	{
+		.min_uV = 1400000,
+		.max_uV = 2193750,
+		.uV_step = 6250,
+	},
+	{
+		.min_uV = 1250000,
+		.max_uV = 2837500,
+		.uV_step = 12500,
+	},
+};
+
+static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
+{
+	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
+	unsigned int data;
+	int ret, mode = 0;
+
+	ret = regmap_read(rdev->regmap, info->conf, &data);
+	if (ret < 0)
+		return ret;
+
+	switch (data & PV88090_BUCK1_MODE_MASK) {
+	case PV88090_BUCK_MODE_SYNC:
+		mode = REGULATOR_MODE_FAST;
+		break;
+	case PV88090_BUCK_MODE_AUTO:
+		mode = REGULATOR_MODE_NORMAL;
+		break;
+	case PV88090_BUCK_MODE_SLEEP:
+		mode = REGULATOR_MODE_STANDBY;
+		break;
+	}
+
+	return mode;
+}
+
+static int pv88090_buck_set_mode(struct regulator_dev *rdev,
+					unsigned int mode)
+{
+	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
+	int val = 0;
+
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		val = PV88090_BUCK_MODE_SYNC;
+		break;
+	case REGULATOR_MODE_NORMAL:
+		val = PV88090_BUCK_MODE_AUTO;
+		break;
+	case REGULATOR_MODE_STANDBY:
+		val = PV88090_BUCK_MODE_SLEEP;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(rdev->regmap, info->conf,
+					PV88090_BUCK1_MODE_MASK, val);
+}
+
+static int pv88090_set_current_limit(struct regulator_dev *rdev, int min,
+				    int max)
+{
+	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
+	int i;
+
+	/* search for closest to maximum */
+	for (i = info->n_current_limits; i >= 0; i--) {
+		if (min <= info->current_limits[i]
+			&& max >= info->current_limits[i]) {
+			return regmap_update_bits(rdev->regmap,
+				info->conf,
+				info->limit_mask,
+				i << PV88090_BUCK1_ILIM_SHIFT);
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int pv88090_get_current_limit(struct regulator_dev *rdev)
+{
+	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
+	unsigned int data;
+	int ret;
+
+	ret = regmap_read(rdev->regmap, info->conf, &data);
+	if (ret < 0)
+		return ret;
+
+	data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT;
+	return info->current_limits[data];
+}
+
+static struct regulator_ops pv88090_buck_ops = {
+	.get_mode = pv88090_buck_get_mode,
+	.set_mode = pv88090_buck_set_mode,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+	.set_current_limit = pv88090_set_current_limit,
+	.get_current_limit = pv88090_get_current_limit,
+};
+
+static struct regulator_ops pv88090_ldo_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+};
+
+#define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
+{\
+	.desc	=	{\
+		.id = chip##_ID_##regl_name,\
+		.name = __stringify(chip##_##regl_name),\
+		.of_match = of_match_ptr(#regl_name),\
+		.regulators_node = of_match_ptr("regulators"),\
+		.type = REGULATOR_VOLTAGE,\
+		.owner = THIS_MODULE,\
+		.ops = &pv88090_buck_ops,\
+		.min_uV = min, \
+		.uV_step = step, \
+		.n_voltages = ((max) - (min))/(step) + 1, \
+		.enable_reg = PV88090_REG_##regl_name##_CONF0, \
+		.enable_mask = PV88090_##regl_name##_EN, \
+		.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
+		.vsel_mask = PV88090_V##regl_name##_MASK, \
+	},\
+	.current_limits = limits_array, \
+	.n_current_limits = ARRAY_SIZE(limits_array), \
+	.limit_mask = PV88090_##regl_name##_ILIM_MASK, \
+	.conf = PV88090_REG_##regl_name##_CONF1, \
+	.conf2 = PV88090_REG_##regl_name##_CONF2, \
+}
+
+#define PV88090_LDO(chip, regl_name, min, step, max) \
+{\
+	.desc	=	{\
+		.id = chip##_ID_##regl_name,\
+		.name = __stringify(chip##_##regl_name),\
+		.of_match = of_match_ptr(#regl_name),\
+		.regulators_node = of_match_ptr("regulators"),\
+		.type = REGULATOR_VOLTAGE,\
+		.owner = THIS_MODULE,\
+		.ops = &pv88090_ldo_ops,\
+		.min_uV = min, \
+		.uV_step = step, \
+		.n_voltages = ((max) - (min))/(step) + 1, \
+		.enable_reg = PV88090_REG_##regl_name##_CONT, \
+		.enable_mask = PV88090_##regl_name##_EN, \
+		.vsel_reg = PV88090_REG_##regl_name##_CONT, \
+		.vsel_mask = PV88090_V##regl_name##_MASK, \
+	},\
+}
+
+static struct pv88090_regulator pv88090_regulator_info[] = {
+	PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
+		pv88090_buck1_limits),
+	PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
+		pv88090_buck23_limits),
+	PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
+		pv88090_buck23_limits),
+	PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
+	PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
+};
+
+static irqreturn_t pv88090_irq_handler(int irq, void *data)
+{
+	struct pv88090 *chip = data;
+	int i, reg_val, err, ret = IRQ_NONE;
+
+	err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
+	if (err < 0)
+		goto error_i2c;
+
+	if (reg_val & PV88090_E_VDD_FLT) {
+		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
+			if (chip->rdev[i] != NULL) {
+				regulator_notifier_call_chain(chip->rdev[i],
+					REGULATOR_EVENT_UNDER_VOLTAGE,
+					NULL);
+			}
+		}
+
+		err = regmap_update_bits(chip->regmap, PV88090_REG_EVENT_A,
+			PV88090_E_VDD_FLT, PV88090_E_VDD_FLT);
+		if (err < 0)
+			goto error_i2c;
+
+		ret = IRQ_HANDLED;
+	}
+
+	if (reg_val & PV88090_E_OVER_TEMP) {
+		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
+			if (chip->rdev[i] != NULL) {
+				regulator_notifier_call_chain(chip->rdev[i],
+					REGULATOR_EVENT_OVER_TEMP,
+					NULL);
+			}
+		}
+
+		err = regmap_update_bits(chip->regmap, PV88090_REG_EVENT_A,
+			PV88090_E_OVER_TEMP, PV88090_E_OVER_TEMP);
+		if (err < 0)
+			goto error_i2c;
+
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+
+error_i2c:
+	dev_err(chip->dev, "I2C error : %d\n", err);
+	return IRQ_NONE;
+}
+
+/*
+ * I2C driver interface functions
+ */
+static int pv88090_i2c_probe(struct i2c_client *i2c,
+		const struct i2c_device_id *id)
+{
+	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
+	struct pv88090 *chip;
+	struct regulator_config config = { };
+	int error, i, ret = 0;
+	unsigned int conf2, range, index;
+
+	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = &i2c->dev;
+	chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
+	if (IS_ERR(chip->regmap)) {
+		error = PTR_ERR(chip->regmap);
+		dev_err(chip->dev, "Failed to allocate register map: %d\n",
+			error);
+		return error;
+	}
+
+	i2c_set_clientdata(i2c, chip);
+
+	if (i2c->irq != 0) {
+		ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
+		if (ret < 0) {
+			dev_err(chip->dev,
+				"Failed to mask A reg: %d\n", ret);
+			return ret;
+		}
+
+		ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
+		if (ret < 0) {
+			dev_err(chip->dev,
+				"Failed to mask B reg: %d\n", ret);
+			return ret;
+		}
+
+		ret = request_threaded_irq(i2c->irq, NULL,
+					pv88090_irq_handler,
+					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
+					"pv88090", chip);
+		if (ret != 0) {
+			dev_err(chip->dev, "Failed to request IRQ: %d\n",
+				i2c->irq);
+			return ret;
+		}
+
+		ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
+			PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
+		if (ret < 0) {
+			dev_err(chip->dev,
+				"Failed to update mask reg: %d\n", ret);
+			return ret;
+		}
+
+	} else {
+		dev_warn(chip->dev, "No IRQ configured\n");
+	}
+
+	config.dev = chip->dev;
+	config.regmap = chip->regmap;
+
+	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
+		if (init_data)
+			config.init_data = &init_data[i];
+
+		if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
+			ret = regmap_read(chip->regmap,
+				pv88090_regulator_info[i].conf2, &conf2);
+			if (ret < 0)
+				return ret;
+
+			conf2 = ((conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT)
+				&& PV88090_BUCK_VDAC_RANGE_MASK);
+
+			ret = regmap_read(chip->regmap,
+				PV88090_REG_BUCK_FOLD_RANGE, &range);
+			if (ret < 0)
+				return ret;
+
+			range = ((range
+				>> (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1))
+				&& PV88080_BUCK_VRANGE_GAIN_MASK);
+			index = ((range << 1) | conf2);
+
+			pv88090_regulator_info[i].desc.min_uV
+				= pv88090_buck_vol[index].min_uV;
+			pv88090_regulator_info[i].desc.uV_step
+				= pv88090_buck_vol[index].uV_step;
+			pv88090_regulator_info[i].desc.n_voltages
+				= ((pv88090_buck_vol[index].max_uV)
+				- (pv88090_buck_vol[index].min_uV))
+				/(pv88090_buck_vol[index].uV_step) + 1;
+		}
+
+		config.driver_data = (void *)&pv88090_regulator_info[i];
+		chip->rdev[i] = devm_regulator_register(chip->dev,
+			&pv88090_regulator_info[i].desc, &config);
+		if (IS_ERR(chip->rdev[i])) {
+			dev_err(chip->dev,
+				"Failed to register PV88090 regulator\n");
+			return PTR_ERR(chip->rdev[i]);
+		}
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id pv88090_i2c_id[] = {
+	{"pv88090", 0},
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pv88090_dt_ids[] = {
+	{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
+	{},
+};
+MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
+#endif
+
+static struct i2c_driver pv88090_regulator_driver = {
+	.driver = {
+		.name = "pv88090",
+		.of_match_table = of_match_ptr(pv88090_dt_ids),
+	},
+	.probe = pv88090_i2c_probe,
+	.id_table = pv88090_i2c_id,
+};
+
+module_i2c_driver(pv88090_regulator_driver);
+
+MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
+MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
+MODULE_LICENSE("GPL");