[PATCH 1/3] regulator: act8865: add PMIC(Power Management IC) driver
Wenyou Yang
wenyou.yang at atmel.com
Wed Dec 11 20:18:49 EST 2013
Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
---
drivers/regulator/Kconfig | 7 +
drivers/regulator/Makefile | 1 +
drivers/regulator/act8865-regulator.c | 516 +++++++++++++++++++++++++++++++++
include/linux/regulator/act8865.h | 56 ++++
4 files changed, 580 insertions(+)
create mode 100644 drivers/regulator/act8865-regulator.c
create mode 100644 include/linux/regulator/act8865.h
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index ce785f4..e13bcf1 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -577,5 +577,12 @@ config REGULATOR_WM8994
This driver provides support for the voltage regulators on the
WM8994 CODEC.
+config REGULATOR_ACT8865
+ tristate "Active-semi act8865 voltage regulator"
+ depends on I2C
+ help
+ This driver controls a active-semi act8865 voltage output
+ regulator via I2C bus.
+
endif
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 01c597e..8bc485f 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -78,6 +78,7 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
+obj-$(CONFIG_REGULATOR_ACT8865) += act8865-regulator.o
ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c
new file mode 100644
index 0000000..d616a28
--- /dev/null
+++ b/drivers/regulator/act8865-regulator.c
@@ -0,0 +1,516 @@
+/*
+ * act8865-regulator.c - Voltage regulation for the active-semi ACT8865
+ * http://www.active-semi.com/sheets/ACT8865_Datasheet.pdf
+ *
+ * Copyright (C) 2013 Atmel Corporation
+ * Wenyou Yang <wenyou.yang at atmel.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; 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>
+
+/*
+ * ACT8865 Global Register Map
+ */
+#define ACT8865_SYS_MODE 0x00
+#define ACT8865_SYS_CTRL 0x01
+#define ACT8865_REG1_VSET1 0x20
+#define ACT8865_REG1_VSET2 0x21
+#define ACT8865_REG1_CTRL 0x22
+#define ACT8865_REG2_VSET1 0x30
+#define ACT8865_REG2_VSET2 0x31
+#define ACT8865_REG2_CTRL 0x32
+#define ACT8865_REG3_VSET1 0x40
+#define ACT8865_REG3_VSET2 0x41
+#define ACT8865_REG3_CTRL 0x42
+#define ACT8865_REG4_VSET 0x50
+#define ACT8865_REG4_CTRL 0x51
+#define ACT8865_REG5_VSET 0x54
+#define ACT8865_REG5_CTRL 0x55
+#define ACT8865_REG6_VSET 0x60
+#define ACT8865_REG6_CTRL 0x61
+#define ACT8865_REG7_VSET 0x64
+#define ACT8865_REG7_CTRL 0x65
+
+struct act8865_data {
+ u8 vsel_is_low:1;
+ struct i2c_client *client;
+ struct regulator_dev *rdev[];
+};
+
+/* ACt8865 voltage table */
+static const u32 act8865_voltages_table[] = {
+ 600000, 625000, 650000, 675000,
+ 700000, 725000, 750000, 775000,
+ 800000, 825000, 850000, 875000,
+ 900000, 925000, 950000, 975000,
+ 1000000, 1025000, 1050000, 1075000,
+ 1100000, 1125000, 1150000, 1175000,
+ 1200000, 1250000, 1300000, 1350000,
+ 1400000, 1450000, 1500000, 1550000,
+ 1600000, 1650000, 1700000, 1750000,
+ 1800000, 1850000, 1900000, 1950000,
+ 2000000, 2050000, 2010000, 2150000,
+ 2200000, 2250000, 2300000, 2350000,
+ 2400000, 2500000, 2600000, 2700000,
+ 2800000, 2900000, 3000000, 3100000,
+ 3200000, 3300000, 3400000, 3500000,
+ 3600000, 3700000, 3800000, 3900000,
+};
+
+static int act8865_read_reg(struct act8865_data *act8865, u8 reg)
+{
+ int ret = i2c_smbus_read_byte_data(act8865->client, reg);
+ if (ret > 0)
+ ret &= 0xff;
+
+ return ret;
+}
+
+static int act8865_write_reg(struct act8865_data *act8865, u8 reg, u8 value)
+{
+ return i2c_smbus_write_byte_data(act8865->client, reg, value);
+}
+
+/*
+ * operation functions
+ */
+
+static u32 act8865_ctrl_reg_addr(int id)
+{
+ u32 reg = 0;
+
+ switch (id) {
+ case ACT8865_ID_REG1:
+ reg = ACT8865_REG1_CTRL;
+ break;
+
+ case ACT8865_ID_REG2:
+ reg = ACT8865_REG2_CTRL;
+ break;
+
+ case ACT8865_ID_REG3:
+ reg = ACT8865_REG3_CTRL;
+ break;
+
+ case ACT8865_ID_REG4:
+ reg = ACT8865_REG4_CTRL;
+ break;
+
+ case ACT8865_ID_REG5:
+ reg = ACT8865_REG5_CTRL;
+ break;
+
+ case ACT8865_ID_REG6:
+ reg = ACT8865_REG6_CTRL;
+ break;
+
+ case ACT8865_ID_REG7:
+ reg = ACT8865_REG7_CTRL;
+ break;
+ };
+
+ return reg;
+}
+
+static u32 act8865_vset_reg_addr(struct act8865_data *act8865, int id)
+{
+ u32 reg = 0;
+
+ switch (id) {
+ case ACT8865_ID_REG1:
+ if (act8865->vsel_is_low)
+ reg = ACT8865_REG1_VSET1;
+ else
+ reg = ACT8865_REG1_VSET2;
+ break;
+
+ case ACT8865_ID_REG2:
+ if (act8865->vsel_is_low)
+ reg = ACT8865_REG2_VSET1;
+ else
+ reg = ACT8865_REG2_VSET2;
+ break;
+
+ case ACT8865_ID_REG3:
+ if (act8865->vsel_is_low)
+ reg = ACT8865_REG3_VSET1;
+ else
+ reg = ACT8865_REG3_VSET2;
+ break;
+
+ case ACT8865_ID_REG4:
+ reg = ACT8865_REG4_VSET;
+ break;
+
+ case ACT8865_ID_REG5:
+ reg = ACT8865_REG5_VSET;
+ break;
+
+ case ACT8865_ID_REG6:
+ reg = ACT8865_REG6_VSET;
+ break;
+
+ case ACT8865_ID_REG7:
+ reg = ACT8865_REG7_VSET;
+ break;
+ };
+
+ return reg;
+}
+
+static int act88665_is_enabled(struct regulator_dev *rdev)
+{
+ struct act8865_data *act8865 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ u32 reg;
+ u8 mask = 0x80;
+
+ reg = act8865_ctrl_reg_addr(id);
+
+ return (act8865_read_reg(act8865, reg) & mask) == mask;
+}
+
+static int act8865_enable(struct regulator_dev *rdev)
+{
+ struct act8865_data *act8865 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ u32 reg;
+ u8 val;
+ u8 mask = 0x80;
+
+ reg = act8865_ctrl_reg_addr(id);
+ val = act8865_read_reg(act8865, reg);
+ val |= mask;
+
+ return act8865_write_reg(act8865, reg, val);
+}
+
+static int act8865_disable(struct regulator_dev *rdev)
+{
+ struct act8865_data *act8865 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ u32 reg;
+ u8 val;
+ u8 mask = 0x80;
+
+ reg = act8865_ctrl_reg_addr(id);
+ val = act8865_read_reg(act8865, reg);
+ val &= ~mask;
+
+ return act8865_write_reg(act8865, reg, val);
+}
+
+static int act8865_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct act8865_data *act8865 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ u32 reg = act8865_vset_reg_addr(act8865, id);
+
+ return act8865_read_reg(act8865, reg);
+}
+
+static int act8865_set_voltage_sel(struct regulator_dev *rdev, u32 selector)
+{
+ struct act8865_data *act8865 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ u32 reg = act8865_vset_reg_addr(act8865, id);
+
+ return act8865_write_reg(act8865, reg, selector);
+}
+
+static int act8865_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+ struct act8865_data *act8865 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ u32 reg = act8865_vset_reg_addr(act8865, id);
+ u32 selector;
+
+ pr_info("%s: suspend voltage %dmV\n", rdev->desc->name, uV / 1000);
+
+ selector = regulator_map_voltage_iterate(rdev, uV, uV);
+
+ return act8865_write_reg(act8865, reg, selector);
+}
+
+static struct regulator_ops act8865_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .set_voltage_sel = act8865_set_voltage_sel,
+ .get_voltage_sel = act8865_get_voltage_sel,
+ .enable = act8865_enable,
+ .disable = act8865_disable,
+ .is_enabled = act88665_is_enabled,
+ .set_suspend_voltage = act8865_set_suspend_voltage,
+ .set_suspend_enable = act8865_enable,
+ .set_suspend_disable = act8865_disable,
+};
+
+static const struct regulator_desc act8865_reg[] = {
+ {
+ .name = "DCDC_REG1",
+ .id = ACT8865_ID_REG1,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "DCDC_REG2",
+ .id = ACT8865_ID_REG2,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "DCDC_REG3",
+ .id = ACT8865_ID_REG3,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO_REG4",
+ .id = ACT8865_ID_REG4,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO_REG5",
+ .id = ACT8865_ID_REG5,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO_REG6",
+ .id = ACT8865_ID_REG6,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .owner = THIS_MODULE,
+ },
+ {
+ .name = "LDO_REG7",
+ .id = ACT8865_ID_REG7,
+ .ops = &act8865_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ARRAY_SIZE(act8865_voltages_table),
+ .volt_table = act8865_voltages_table,
+ .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 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;
+ struct of_regulator_match rmatch[ARRAY_SIZE(act8865_reg)];
+
+ if (of_find_property(dev->of_node, "vsel-state-low", NULL))
+ pdata->vsel_is_low = 1;
+
+ np = of_find_node_by_name(dev->of_node, "regulators");
+ if (!np) {
+ dev_err(dev, "missing 'regulators' subnode in DT\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(rmatch); i++)
+ rmatch[i].name = act8865_reg[i].name;
+
+ matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
+ 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++) {
+ regulator->id = i;
+ regulator->name = rmatch[i].name;
+ regulator->platform_data = rmatch[i].init_data;
+ of_node[i] = rmatch[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_pmu_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct regulator_dev **rdev;
+ struct device *dev = &client->dev;
+ struct act8865_platform_data *pdata = dev_get_platdata(dev);
+ struct regulator_config config = { };
+ struct act8865_data *act8865;
+ int i, id;
+ int ret = -EINVAL;
+ struct device_node *of_node[ACT8865_REG_NUM];
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ 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;
+ } else {
+ memset(of_node, 0, sizeof(of_node));
+ }
+
+ if (pdata->num_regulators > ACT8865_REG_NUM) {
+ dev_err(dev, "Too many regulators found!\n");
+ return -EINVAL;
+ }
+
+ act8865 = devm_kzalloc(dev, sizeof(struct act8865_data) +
+ sizeof(struct regulator_dev *) * ACT8865_REG_NUM,
+ GFP_KERNEL);
+ if (!act8865)
+ return -ENOMEM;
+
+ act8865->client = client;
+ act8865->vsel_is_low = pdata->vsel_is_low;
+ rdev = act8865->rdev;
+
+ /* 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;
+
+ rdev[i] = regulator_register(&act8865_reg[id], &config);
+ if (IS_ERR(rdev[i])) {
+ ret = PTR_ERR(rdev[i]);
+ dev_err(dev, "failed to register %s\n",
+ act8865_reg[id].name);
+ goto err_unregister;
+ }
+ }
+
+ i2c_set_clientdata(client, act8865);
+
+ return 0;
+
+err_unregister:
+ while (--i >= 0)
+ regulator_unregister(rdev[i]);
+
+ return ret;
+}
+
+static int act8865_pmu_remove(struct i2c_client *client)
+{
+ struct act8865_data *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_pmu_driver = {
+ .probe = act8865_pmu_probe,
+ .remove = act8865_pmu_remove,
+ .driver = {
+ .name = "act8865",
+ .owner = THIS_MODULE,
+ },
+ .id_table = act8865_ids,
+};
+
+static int __init act8865_pmu_init(void)
+{
+ return i2c_add_driver(&act8865_pmu_driver);
+}
+subsys_initcall(act8865_pmu_init);
+
+static void __exit act8865_pmu_exit(void)
+{
+ i2c_del_driver(&act8865_pmu_driver);
+}
+module_exit(act8865_pmu_exit);
+
+MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver");
+MODULE_AUTHOR("Wenyou Yang <wenyou.yang at atmel.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/act8865.h b/include/linux/regulator/act8865.h
new file mode 100644
index 0000000..202544f
--- /dev/null
+++ b/include/linux/regulator/act8865.h
@@ -0,0 +1,56 @@
+/*
+ * 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_REG1,
+ ACT8865_ID_REG2,
+ ACT8865_ID_REG3,
+ ACT8865_ID_REG4,
+ ACT8865_ID_REG5,
+ ACT8865_ID_REG6,
+ ACT8865_ID_REG7,
+ 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
+ * @vsel_is_low: VSEL pin, drive to logic low to select default output voltage,
+ * drive to logic high to select secondary output voltage.
+ */
+struct act8865_platform_data {
+ int num_regulators;
+ struct act8865_regulator_data *regulators;
+ unsigned vsel_is_low:1;
+};
+#endif
--
1.7.9.5
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