[PATCH] MAX8952 PMIC Driver Initial Release
MyungJoo Ham
myungjoo.ham at samsung.com
Thu Aug 19 03:05:15 EDT 2010
MAX8952 PMIC is used to provide VDD_ARM for S5PC210/UNIVERSAL board. In
this initial release, users can set voltages for four DVS modes, RAMP
delay values, and SYNC frequency. Controlling FPWM/SYNC_MODE/Pull-Down/
Ramp Modes and reading CHIP_ID is not supported in this release.
If MAX8952's EN is not going to be changed by this driver, the user
should set gpio_en_writable as false. In S5PC210/UNIVERSL board,
controlling EN pin at MAX8952 driver can be dangerous because this gpio
pin is shared with another PMIC.
We assume that V_OUT is capable to provide every voltage from 770mV to
1.40V in 10mV steps although the data sheet has some ambiguity on it.
Signed-off-by: MyungJoo Ham <myungjoo.ham at samsung.com>
---
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/max8952.c | 374 +++++++++++++++++++++++++++++++++++++
include/linux/regulator/max8952.h | 141 ++++++++++++++
4 files changed, 524 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/max8952.c
create mode 100644 include/linux/regulator/max8952.h
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 172951b..4889caa 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -100,6 +100,14 @@ config REGULATOR_MAX8925
help
Say y here to support the voltage regulaltor of Maxim MAX8925 PMIC.
+config REGULATOR_MAX8952
+ tristate "Maxim MAX8952 Power Management IC"
+ depends on I2C
+ help
+ This driver controls a Maxim 8952 voltage output regulator
+ via I2C bus. Maxim 8952 has one voltage output and supports 4 DVS
+ modes ranging from 0.77V to 1.40V by 0.01V steps.
+
config REGULATOR_MAX8998
tristate "Maxim 8998 voltage regulator"
depends on MFD_MAX8998
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 8285fd8..beff6da 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o
obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
+obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o
obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o
diff --git a/drivers/regulator/max8952.c b/drivers/regulator/max8952.c
new file mode 100644
index 0000000..c7ad8c4
--- /dev/null
+++ b/drivers/regulator/max8952.c
@@ -0,0 +1,374 @@
+/*
+ * max8952.c - Voltage and current regulation for the Maxim 8952
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ * MyungJoo Ham <myungjoo.ham at samsung.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.
+ *
+ * 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/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/max8952.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+/* Registers */
+enum {
+ MAX8952_REG_MODE0,
+ MAX8952_REG_MODE1,
+ MAX8952_REG_MODE2,
+ MAX8952_REG_MODE3,
+ MAX8952_REG_CONTROL,
+ MAX8952_REG_SYNC,
+ MAX8952_REG_RAMP,
+ MAX8952_REG_CHIP_ID1,
+ MAX8952_REG_CHIP_ID2,
+};
+
+struct max8952_data {
+ struct i2c_client *client;
+ struct device *dev;
+ struct mutex mutex;
+ struct max8952_platform_data *pdata;
+ struct regulator_dev *rdev;
+};
+
+static int max8952_i2c_read(struct i2c_client *client, u8 reg, u8 *dest)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0)
+ return -EIO;
+
+ ret &= 0xff;
+ *dest = ret;
+ return 0;
+}
+
+static int max8952_i2c_write(struct i2c_client *client, u8 reg, u8 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+ return ret;
+}
+
+static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
+{
+ u8 value = 0;
+ int ret;
+
+ mutex_lock(&max8952->mutex);
+ ret = max8952_i2c_read(max8952->client, reg, &value);
+ mutex_unlock(&max8952->mutex);
+ if (!ret)
+ ret = value & 0xff;
+
+ return ret;
+}
+
+static int max8952_write_reg(struct max8952_data *max8952,
+ u8 reg, u8 value)
+{
+ int ret;
+
+ mutex_lock(&max8952->mutex);
+ ret = max8952_i2c_write(max8952->client, reg, value);
+ mutex_unlock(&max8952->mutex);
+
+ return ret;
+}
+
+static int max8952_voltage(struct max8952_data *max8952, u8 mode)
+{
+ return (max8952->pdata->dvs_mode[mode] * 10 + 770) * 1000;
+}
+
+static int max8952_list_voltage(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+ if (rdev_get_id(rdev) != 0)
+ return -EINVAL;
+
+ return max8952_voltage(max8952, selector);
+}
+
+static int max8952_is_enabled(struct regulator_dev *rdev)
+{
+ struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+ if (gpio_is_valid(max8952->pdata->gpio_en))
+ return gpio_get_value(max8952->pdata->gpio_en);
+
+ return -ENXIO;
+}
+
+static int max8952_enable(struct regulator_dev *rdev)
+{
+ struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+ if (max8952->pdata->gpio_en_writable) {
+ if (gpio_is_valid(max8952->pdata->gpio_en))
+ gpio_set_value(max8952->pdata->gpio_en, 1);
+ else
+ return -ENXIO;
+ } else
+ return -EPERM;
+
+ return 0;
+}
+
+static int max8952_disable(struct regulator_dev *rdev)
+{
+ struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+ if (max8952->pdata->gpio_en_writable) {
+ if (gpio_is_valid(max8952->pdata->gpio_en))
+ gpio_set_value(max8952->pdata->gpio_en, 0);
+ else
+ return -ENXIO;
+ } else
+ return -EPERM;
+
+ return 0;
+}
+
+static int max8952_get_voltage(struct regulator_dev *rdev)
+{
+ struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+ u8 vid = 0;
+
+ if (gpio_is_valid(max8952->pdata->gpio_vid0) &&
+ gpio_is_valid(max8952->pdata->gpio_vid1)) {
+ if (gpio_get_value(max8952->pdata->gpio_vid0))
+ vid += 1;
+ if (gpio_get_value(max8952->pdata->gpio_vid1))
+ vid += 2;
+ } else
+ return -ENXIO;
+
+ return max8952_voltage(max8952, vid);
+}
+
+static int max8952_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+ u8 vid = -1, i;
+
+ for (i = 0; i < MAX8952_NUM_DVS_MODE; i++) {
+ int volt = max8952_voltage(max8952, i);
+
+ /* Set the voltage as low as possible within the range */
+ if ((volt <= max_uV) && (volt >= min_uV))
+ if ((vid == -1) ||
+ (max8952_voltage(max8952, vid) > volt))
+ vid = i;
+ }
+
+ if ((vid >= 0) && (vid < MAX8952_NUM_DVS_MODE)) {
+ gpio_set_value(max8952->pdata->gpio_vid0, vid % 2);
+ gpio_set_value(max8952->pdata->gpio_vid1, (vid >> 1) % 2);
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int max8952_do_nothing(struct regulator_dev *rdev)
+{
+ return 0;
+}
+
+static struct regulator_ops max8952_ops = {
+ .list_voltage = max8952_list_voltage,
+ .is_enabled = max8952_is_enabled,
+ .enable = max8952_enable,
+ .disable = max8952_disable,
+ .get_voltage = max8952_get_voltage,
+ .set_voltage = max8952_set_voltage,
+ .set_suspend_enable = max8952_do_nothing,
+ .set_suspend_disable = max8952_disable,
+};
+
+static struct regulator_desc regulator = {
+ .name = "MAX8952_VOUT",
+ .id = 0,
+ .n_voltages = MAX8952_NUM_DVS_MODE,
+ .ops = &max8952_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+};
+
+static int __devinit max8952_pmic_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct max8952_platform_data *pdata = client->dev.platform_data;
+ struct max8952_data *max8952;
+
+ int ret;
+
+ pr_info("MAX8952 Probing...\n");
+
+ if (!pdata) {
+ dev_err(&client->dev, "Require the platform data\n");
+ return -EINVAL;
+ }
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ max8952 = kzalloc(sizeof(struct max8952_data), GFP_KERNEL);
+ if (!max8952)
+ return -ENOMEM;
+
+ if (pdata->gpio_en_writable == false) {
+ max8952_ops.enable = NULL;
+ max8952_ops.disable = NULL;
+ max8952_ops.set_suspend_disable = max8952_do_nothing;
+ }
+
+ max8952->client = client;
+ max8952->dev = &client->dev;
+ max8952->pdata = pdata;
+ mutex_init(&max8952->mutex);
+
+ max8952->rdev = regulator_register(®ulator, max8952->dev,
+ &pdata->reg_data, max8952);
+
+ ret = IS_ERR(max8952->rdev);
+ if (ret)
+ dev_err(max8952->dev, "regulator init failed\n");
+
+ if (gpio_is_valid(pdata->gpio_vid0) &&
+ gpio_is_valid(pdata->gpio_vid1) &&
+ gpio_is_valid(pdata->gpio_en)) {
+ ret = gpio_request(pdata->gpio_vid0, "MAX8952 VID0");
+ if (ret)
+ return ret;
+ gpio_direction_output(pdata->gpio_vid0,
+ (pdata->default_mode) % 2);
+
+ ret = gpio_request(pdata->gpio_vid1, "MAX8952 VID1");
+ if (ret)
+ goto out_vid1;
+ gpio_direction_output(pdata->gpio_vid1,
+ (pdata->default_mode >> 1) % 2);
+
+ ret = gpio_request(pdata->gpio_en, "MAX8952 EN");
+ if (ret)
+ goto out_en;
+
+ max8952_write_reg(max8952, MAX8952_REG_MODE0,
+ (max8952_read_reg(max8952,
+ MAX8952_REG_MODE0) & 0xC0) |
+ (pdata->dvs_mode[0] & 0x3F));
+ max8952_write_reg(max8952, MAX8952_REG_MODE1,
+ (max8952_read_reg(max8952,
+ MAX8952_REG_MODE1) & 0xC0) |
+ (pdata->dvs_mode[1] & 0x3F));
+ max8952_write_reg(max8952, MAX8952_REG_MODE2,
+ (max8952_read_reg(max8952,
+ MAX8952_REG_MODE2) & 0xC0) |
+ (pdata->dvs_mode[2] & 0x3F));
+ max8952_write_reg(max8952, MAX8952_REG_MODE3,
+ (max8952_read_reg(max8952,
+ MAX8952_REG_MODE3) & 0xC0) |
+ (pdata->dvs_mode[3] & 0x3F));
+ } else {
+ pr_err("MAX8952 Initilization Failed: Wrong GPIO setting.\n");
+ return -EINVAL;
+ }
+
+ max8952_write_reg(max8952, MAX8952_REG_SYNC,
+ (max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) |
+ ((pdata->sync_freq & 0x3) << 6));
+ max8952_write_reg(max8952, MAX8952_REG_RAMP,
+ (max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) |
+ ((pdata->ramp_speed & 0x7) << 5));
+
+ i2c_set_clientdata(client, max8952);
+ return 0;
+out_en:
+ gpio_free(pdata->gpio_vid1);
+out_vid1:
+ gpio_free(pdata->gpio_vid0);
+ return ret;
+}
+
+static int __devexit max8952_pmic_remove(struct i2c_client *client)
+{
+ struct max8952_data *max8952 = i2c_get_clientdata(client);
+ struct max8952_platform_data *pdata = max8952->pdata;
+ struct regulator_dev *rdev = max8952->rdev;
+
+ regulator_unregister(rdev);
+
+ gpio_free(pdata->gpio_vid0);
+ gpio_free(pdata->gpio_vid1);
+ gpio_free(pdata->gpio_en);
+
+ kfree(max8952);
+ i2c_set_clientdata(client, NULL);
+ return 0;
+}
+
+static const struct i2c_device_id max8952_ids[] = {
+ { "max8952", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, max8952_ids);
+
+static struct i2c_driver max8952_pmic_driver = {
+ .probe = max8952_pmic_probe,
+ .remove = __devexit_p(max8952_pmic_remove),
+ .driver = {
+ .name = "max8952",
+ },
+ .id_table = max8952_ids,
+};
+
+static int __init max8952_pmic_init(void)
+{
+ return i2c_add_driver(&max8952_pmic_driver);
+}
+#ifdef CONFIG_REGULATOR_RESUME
+/* becasue alway_power_on, add this feature,
+ * To do this at bootloader is better */
+beforeresume_initcall(max8952_pmic_init);
+#else
+subsys_initcall(max8952_pmic_init);
+#endif
+
+static void __exit max8952_pmic_exit(void)
+{
+ i2c_del_driver(&max8952_pmic_driver);
+}
+module_exit(max8952_pmic_exit);
+
+MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham at samsung.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/max8952.h b/include/linux/regulator/max8952.h
new file mode 100644
index 0000000..34c898a
--- /dev/null
+++ b/include/linux/regulator/max8952.h
@@ -0,0 +1,141 @@
+/*
+ * max8952.h - Voltage regulation for the Maxim 8952
+ *
+ * Copyright (C) 2010 Samsung Electrnoics
+ * MyungJoo Ham <myungjoo.ham at samsung.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.
+ *
+ * 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
+ */
+
+#ifndef REGULATOR_MAX8952
+#define REGULATOR_MAX8952
+
+#include <linux/regulator/machine.h>
+
+enum {
+ MAX8952_DVS_MODE0,
+ MAX8952_DVS_MODE1,
+ MAX8952_DVS_MODE2,
+ MAX8952_DVS_MODE3,
+};
+
+enum {
+ MAX8952_DVS_770mV = 0,
+ MAX8952_DVS_780mV,
+ MAX8952_DVS_790mV,
+ MAX8952_DVS_800mV,
+ MAX8952_DVS_810mV,
+ MAX8952_DVS_820mV,
+ MAX8952_DVS_830mV,
+ MAX8952_DVS_840mV,
+ MAX8952_DVS_850mV,
+ MAX8952_DVS_860mV,
+ MAX8952_DVS_870mV,
+ MAX8952_DVS_880mV,
+ MAX8952_DVS_890mV,
+ MAX8952_DVS_900mV,
+ MAX8952_DVS_910mV,
+ MAX8952_DVS_920mV,
+ MAX8952_DVS_930mV,
+ MAX8952_DVS_940mV,
+ MAX8952_DVS_950mV,
+ MAX8952_DVS_960mV,
+ MAX8952_DVS_970mV,
+ MAX8952_DVS_980mV,
+ MAX8952_DVS_990mV,
+ MAX8952_DVS_1000mV,
+ MAX8952_DVS_1010mV,
+ MAX8952_DVS_1020mV,
+ MAX8952_DVS_1030mV,
+ MAX8952_DVS_1040mV,
+ MAX8952_DVS_1050mV,
+ MAX8952_DVS_1060mV,
+ MAX8952_DVS_1070mV,
+ MAX8952_DVS_1080mV,
+ MAX8952_DVS_1090mV,
+ MAX8952_DVS_1100mV,
+ MAX8952_DVS_1110mV,
+ MAX8952_DVS_1120mV,
+ MAX8952_DVS_1130mV,
+ MAX8952_DVS_1140mV,
+ MAX8952_DVS_1150mV,
+ MAX8952_DVS_1160mV,
+ MAX8952_DVS_1170mV,
+ MAX8952_DVS_1180mV,
+ MAX8952_DVS_1190mV,
+ MAX8952_DVS_1200mV,
+ MAX8952_DVS_1210mV,
+ MAX8952_DVS_1220mV,
+ MAX8952_DVS_1230mV,
+ MAX8952_DVS_1240mV,
+ MAX8952_DVS_1250mV,
+ MAX8952_DVS_1260mV,
+ MAX8952_DVS_1270mV,
+ MAX8952_DVS_1280mV,
+ MAX8952_DVS_1290mV,
+ MAX8952_DVS_1300mV,
+ MAX8952_DVS_1310mV,
+ MAX8952_DVS_1320mV,
+ MAX8952_DVS_1330mV,
+ MAX8952_DVS_1340mV,
+ MAX8952_DVS_1350mV,
+ MAX8952_DVS_1360mV,
+ MAX8952_DVS_1370mV,
+ MAX8952_DVS_1380mV,
+ MAX8952_DVS_1390mV,
+ MAX8952_DVS_1400mV,
+};
+
+enum {
+ MAX8952_SYNC_FREQ_26MHZ, /* Default */
+ MAX8952_SYNC_FREQ_13MHZ,
+ MAX8952_SYNC_FREQ_19_2MHZ,
+};
+
+enum {
+ MAX8952_RAMP_32mV_us = 0, /* Default */
+ MAX8952_RAMP_16mV_us,
+ MAX8952_RAMP_8mV_us,
+ MAX8952_RAMP_4mV_us,
+ MAX8952_RAMP_2mV_us,
+ MAX8952_RAMP_1mV_us,
+ MAX8952_RAMP_0_5mV_us,
+ MAX8952_RAMP_0_25mV_us,
+};
+
+#define MAX8952_NUM_DVS_MODE 4
+
+struct max8952_platform_data {
+ int gpio_vid0;
+ int gpio_vid1;
+ int gpio_en;
+
+ /*
+ * In C210 Universal Board, EN is connected to PWR_EN, which can also
+ * turn off the whole system. In such a case, disable en_writable.
+ */
+ bool gpio_en_writable;
+
+ u8 default_mode;
+ u8 dvs_mode[MAX8952_NUM_DVS_MODE]; /* MAX8952_DVS_MODEx_XXXXmV */
+
+ u8 sync_freq;
+ u8 ramp_speed;
+
+ struct regulator_init_data reg_data;
+};
+
+
+#endif /* REGULATOR_MAX8952 */
--
1.6.3.3
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