regulator: act8865: add PMIC act8865 driver

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

4 files changed, 430 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index ce785f481281..63bc1bab37e3 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -70,6 +70,14 @@ config REGULATOR_88PM8607
         help
           This driver supports 88PM8607 voltage regulator chips.
 
+config REGULATOR_ACT8865
+        tristate "Active-semi act8865 voltage regulator"
+        depends on I2C
+        select REGMAP_I2C
+        help
+          This driver controls a active-semi act8865 voltage output
+          regulator via I2C bus.
+
 config REGULATOR_AD5398
         tristate "Analog Devices AD5398/AD5821 regulators"
         depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 01c597ea1744..3bb3a5591b95 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
 obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
 obj-$(CONFIG_REGULATOR_AB8500)  += ab8500-ext.o ab8500.o
+obj-$(CONFIG_REGULATOR_ACT8865) += act8865-regulator.o
 obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
 obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
 obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o arizona-ldo1.o
diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c
new file mode 100644
index 000000000000..db048f20745b
--- /dev/null
+++ b/drivers/regulator/act8865-regulator.c
@@ -0,0 +1,368 @@
+/*
+ * act8865-regulator.c - Voltage regulation for the active-semi ACT8865
+ * http://www.active-semi.com/sheets/ACT8865_Datasheet.pdf
+ *
+ * Copyright (C) 2013 Atmel Corporation
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/act8865.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regmap.h>
+
+/*
+ * ACT8865 Global Register Map.
+ */
+#define ACT8865_SYS_MODE        0x00
+#define ACT8865_SYS_CTRL        0x01
+#define ACT8865_DCDC1_VSET1     0x20
+#define ACT8865_DCDC1_VSET2     0x21
+#define ACT8865_DCDC1_CTRL      0x22
+#define ACT8865_DCDC2_VSET1     0x30
+#define ACT8865_DCDC2_VSET2     0x31
+#define ACT8865_DCDC2_CTRL      0x32
+#define ACT8865_DCDC3_VSET1     0x40
+#define ACT8865_DCDC3_VSET2     0x41
+#define ACT8865_DCDC3_CTRL      0x42
+#define ACT8865_LDO1_VSET       0x50
+#define ACT8865_LDO1_CTRL       0x51
+#define ACT8865_LDO2_VSET       0x54
+#define ACT8865_LDO2_CTRL       0x55
+#define ACT8865_LDO3_VSET       0x60
+#define ACT8865_LDO3_CTRL       0x61
+#define ACT8865_LDO4_VSET       0x64
+#define ACT8865_LDO4_CTRL       0x65
+
+/*
+ * Field Definitions.
+ */
+#define ACT8865_ENA             0x80    /* ON - [7] */
+#define ACT8865_VSEL_MASK       0x3F    /* VSET - [5:0] */
+
+/*
+ * ACT8865 voltage number
+ */
+#define ACT8865_VOLTAGE_NUM     64
+
+struct act8865 {
+        struct regulator_dev *rdev[ACT8865_REG_NUM];
+        struct regmap *regmap;
+};
+
+static const struct regmap_config act8865_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+};
+
+static const struct regulator_linear_range act8865_volatge_ranges[] = {
+        REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
+        REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
+        REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
+};
+
+static struct regulator_ops act8865_ops = {
+        .list_voltage           = regulator_list_voltage_linear_range,
+        .map_voltage            = regulator_map_voltage_linear_range,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .is_enabled             = regulator_is_enabled_regmap,
+        .set_suspend_enable     = regulator_enable_regmap,
+        .set_suspend_disable    = regulator_disable_regmap,
+};
+
+static const struct regulator_desc act8865_reg[] = {
+        {
+                .name = "DCDC_REG1",
+                .id = ACT8865_ID_DCDC1,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_DCDC1_VSET1,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_DCDC1_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+        {
+                .name = "DCDC_REG2",
+                .id = ACT8865_ID_DCDC2,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_DCDC2_VSET1,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_DCDC2_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+        {
+                .name = "DCDC_REG3",
+                .id = ACT8865_ID_DCDC3,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_DCDC3_VSET1,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_DCDC3_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+        {
+                .name = "LDO_REG1",
+                .id = ACT8865_ID_LDO1,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_LDO1_VSET,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_LDO1_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+        {
+                .name = "LDO_REG2",
+                .id = ACT8865_ID_LDO2,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_LDO2_VSET,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_LDO2_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+        {
+                .name = "LDO_REG3",
+                .id = ACT8865_ID_LDO3,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_LDO3_VSET,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_LDO3_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+        {
+                .name = "LDO_REG4",
+                .id = ACT8865_ID_LDO4,
+                .ops = &act8865_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = ACT8865_VOLTAGE_NUM,
+                .linear_ranges = act8865_volatge_ranges,
+                .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
+                .vsel_reg = ACT8865_LDO4_VSET,
+                .vsel_mask = ACT8865_VSEL_MASK,
+                .enable_reg = ACT8865_LDO4_CTRL,
+                .enable_mask = ACT8865_ENA,
+                .owner = THIS_MODULE,
+        },
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id act8865_dt_ids[] = {
+        { .compatible = "active-semi,act8865" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, act8865_dt_ids);
+
+static struct of_regulator_match act8865_matches[] = {
+        [ACT8865_ID_DCDC1]      = { .name = "DCDC_REG1"},
+        [ACT8865_ID_DCDC2]      = { .name = "DCDC_REG2"},
+        [ACT8865_ID_DCDC3]      = { .name = "DCDC_REG3"},
+        [ACT8865_ID_LDO1]       = { .name = "LDO_REG1"},
+        [ACT8865_ID_LDO2]       = { .name = "LDO_REG2"},
+        [ACT8865_ID_LDO3]       = { .name = "LDO_REG3"},
+        [ACT8865_ID_LDO4]       = { .name = "LDO_REG4"},
+};
+
+static int act8865_pdata_from_dt(struct device *dev,
+                                 struct device_node **of_node,
+                                 struct act8865_platform_data *pdata)
+{
+        int matched, i;
+        struct device_node *np;
+        struct act8865_regulator_data *regulator;
+
+        np = of_find_node_by_name(dev->of_node, "regulators");
+        if (!np) {
+                dev_err(dev, "missing 'regulators' subnode in DT\n");
+                return -EINVAL;
+        }
+
+        matched = of_regulator_match(dev, np,
+                                act8865_matches, ARRAY_SIZE(act8865_matches));
+        if (matched <= 0)
+                return matched;
+
+        pdata->regulators = devm_kzalloc(dev,
+                                sizeof(struct act8865_regulator_data) * matched,
+                                GFP_KERNEL);
+        if (!pdata->regulators) {
+                dev_err(dev, "%s: failed to allocate act8865 registor\n",
+                                                __func__);
+                return -ENOMEM;
+        }
+
+        pdata->num_regulators = matched;
+        regulator = pdata->regulators;
+
+        for (i = 0; i < matched; i++) {
+                if (!act8865_matches[i].init_data)
+                        continue;
+
+                regulator->id = i;
+                regulator->name = act8865_matches[i].name;
+                regulator->platform_data = act8865_matches[i].init_data;
+                of_node[i] = act8865_matches[i].of_node;
+                regulator++;
+        }
+
+        return 0;
+}
+#else
+static inline int act8865_pdata_from_dt(struct device *dev,
+                                        struct device_node **of_node,
+                                        struct act8865_platform_data *pdata)
+{
+        return 0;
+}
+#endif
+
+static int act8865_pmic_probe(struct i2c_client *client,
+                           const struct i2c_device_id *i2c_id)
+{
+        struct regulator_dev **rdev;
+        struct device *dev = &client->dev;
+        struct act8865_platform_data *pdata = dev_get_platdata(dev);
+        struct regulator_config config = { };
+        struct act8865 *act8865;
+        struct device_node *of_node[ACT8865_REG_NUM];
+        int i, id;
+        int ret = -EINVAL;
+        int error;
+
+        if (dev->of_node && !pdata) {
+                const struct of_device_id *id;
+                struct act8865_platform_data pdata_of;
+
+                id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
+                if (!id)
+                        return -ENODEV;
+
+                ret = act8865_pdata_from_dt(dev, of_node, &pdata_of);
+                if (ret < 0)
+                        return ret;
+
+                pdata = &pdata_of;
+        }
+
+        if (pdata->num_regulators > ACT8865_REG_NUM) {
+                dev_err(dev, "Too many regulators found!\n");
+                return -EINVAL;
+        }
+
+        act8865 = devm_kzalloc(dev, sizeof(struct act8865) +
+                        sizeof(struct regulator_dev *) * ACT8865_REG_NUM,
+                        GFP_KERNEL);
+        if (!act8865)
+                return -ENOMEM;
+
+        rdev = act8865->rdev;
+
+        act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
+        if (IS_ERR(act8865->regmap)) {
+                error = PTR_ERR(act8865->regmap);
+                dev_err(&client->dev, "Failed to allocate register map: %d\n",
+                        error);
+                return error;
+        }
+
+        /* Finally register devices */
+        for (i = 0; i < pdata->num_regulators; i++) {
+
+                id = pdata->regulators[i].id;
+
+                config.dev = dev;
+                config.init_data = pdata->regulators[i].platform_data;
+                config.of_node = of_node[i];
+                config.driver_data = act8865;
+                config.regmap = act8865->regmap;
+
+                rdev[i] = devm_regulator_register(&client->dev,
+                                                &act8865_reg[i], &config);
+                if (IS_ERR(rdev[i])) {
+                        dev_err(dev, "failed to register %s\n",
+                                act8865_reg[id].name);
+                        return PTR_ERR(rdev[i]);
+                }
+        }
+
+        i2c_set_clientdata(client, act8865);
+
+        return 0;
+}
+
+static int act8865_pmic_remove(struct i2c_client *client)
+{
+        struct act8865 *act8865 = i2c_get_clientdata(client);
+        int i;
+
+        for (i = 0; i < ACT8865_REG_NUM; i++)
+                regulator_unregister(act8865->rdev[i]);
+
+        return 0;
+}
+
+static const struct i2c_device_id act8865_ids[] = {
+        { "act8865", 0 },
+        { },
+};
+MODULE_DEVICE_TABLE(i2c, act8865_ids);
+
+static struct i2c_driver act8865_pmic_driver = {
+        .driver = {
+                .name   = "act8865",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = act8865_pmic_probe,
+        .remove         = act8865_pmic_remove,
+        .id_table       = act8865_ids,
+};
+
+module_i2c_driver(act8865_pmic_driver);
+
+MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver");
+MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regulator/act8865.h b/include/linux/regulator/act8865.h
new file mode 100644
index 000000000000..49206c1b4905
--- /dev/null
+++ b/include/linux/regulator/act8865.h
@@ -0,0 +1,53 @@
+/*
+ * act8865.h  --  Voltage regulation for the active-semi act8865
+ *
+ * Copyright (C) 2013 Atmel Corporation.
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_REGULATOR_ACT8865_H
+#define __LINUX_REGULATOR_ACT8865_H
+
+#include <linux/regulator/machine.h>
+
+enum {
+        ACT8865_ID_DCDC1,
+        ACT8865_ID_DCDC2,
+        ACT8865_ID_DCDC3,
+        ACT8865_ID_LDO1,
+        ACT8865_ID_LDO2,
+        ACT8865_ID_LDO3,
+        ACT8865_ID_LDO4,
+        ACT8865_REG_NUM,
+};
+
+/**
+ * act8865_regulator_data - regulator data
+ * @id: regulator id
+ * @name: regulator name
+ * @platform_data: regulator init data
+ */
+struct act8865_regulator_data {
+        int id;
+        const char *name;
+        struct regulator_init_data *platform_data;
+};
+
+/**
+ * act8865_platform_data - platform data for act8865
+ * @num_regulators: number of regulators used
+ * @regulators: pointer to regulators used
+ */
+struct act8865_platform_data {
+        int num_regulators;
+        struct act8865_regulator_data *regulators;
+};
+#endif