--- /dev/null
+/*
+ * Regulators driver for Maxim max8649
+ *
+ * Copyright (C) 2009-2010 Marvell International Ltd.
+ * Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/slab.h>
+#include <linux/regulator/max8649.h>
+#include <linux/regmap.h>
+
+#define MAX8649_DCDC_VMIN 750000 /* uV */
+#define MAX8649_DCDC_VMAX 1380000 /* uV */
+#define MAX8649_DCDC_STEP 10000 /* uV */
+#define MAX8649_VOL_MASK 0x3f
+
+/* Registers */
+#define MAX8649_MODE0 0x00
+#define MAX8649_MODE1 0x01
+#define MAX8649_MODE2 0x02
+#define MAX8649_MODE3 0x03
+#define MAX8649_CONTROL 0x04
+#define MAX8649_SYNC 0x05
+#define MAX8649_RAMP 0x06
+#define MAX8649_CHIP_ID1 0x08
+#define MAX8649_CHIP_ID2 0x09
+
+/* Bits */
+#define MAX8649_EN_PD (1 << 7)
+#define MAX8649_VID0_PD (1 << 6)
+#define MAX8649_VID1_PD (1 << 5)
+#define MAX8649_VID_MASK (3 << 5)
+
+#define MAX8649_FORCE_PWM (1 << 7)
+#define MAX8649_SYNC_EXTCLK (1 << 6)
+
+#define MAX8649_EXT_MASK (3 << 6)
+
+#define MAX8649_RAMP_MASK (7 << 5)
+#define MAX8649_RAMP_DOWN (1 << 1)
+
+struct max8649_regulator_info {
+ struct device *dev;
+ struct regmap *regmap;
+
+ unsigned mode:2; /* bit[1:0] = VID1, VID0 */
+ unsigned extclk_freq:2;
+ unsigned extclk:1;
+ unsigned ramp_timing:3;
+ unsigned ramp_down:1;
+};
+
+static int max8649_enable_time(struct regulator_dev *rdev)
+{
+ struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+ int voltage, rate, ret;
+ unsigned int val;
+
+ /* get voltage */
+ ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
+ if (ret != 0)
+ return ret;
+ val &= MAX8649_VOL_MASK;
+ voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
+
+ /* get rate */
+ ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
+ if (ret != 0)
+ return ret;
+ ret = (val & MAX8649_RAMP_MASK) >> 5;
+ rate = (32 * 1000) >> ret; /* uV/uS */
+
+ return DIV_ROUND_UP(voltage, rate);
+}
+
+static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
+ MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
+ break;
+ case REGULATOR_MODE_NORMAL:
+ regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
+ MAX8649_FORCE_PWM, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static unsigned int max8649_get_mode(struct regulator_dev *rdev)
+{
+ struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
+ if (ret != 0)
+ return ret;
+ if (val & MAX8649_FORCE_PWM)
+ return REGULATOR_MODE_FAST;
+ return REGULATOR_MODE_NORMAL;
+}
+
+static const struct regulator_ops max8649_dcdc_ops = {
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .map_voltage = regulator_map_voltage_linear,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable_time = max8649_enable_time,
+ .set_mode = max8649_set_mode,
+ .get_mode = max8649_get_mode,
+
+};
+
+static struct regulator_desc dcdc_desc = {
+ .name = "max8649",
+ .ops = &max8649_dcdc_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = 1 << 6,
+ .owner = THIS_MODULE,
+ .vsel_mask = MAX8649_VOL_MASK,
+ .min_uV = MAX8649_DCDC_VMIN,
+ .uV_step = MAX8649_DCDC_STEP,
+ .enable_reg = MAX8649_CONTROL,
+ .enable_mask = MAX8649_EN_PD,
+ .enable_is_inverted = true,
+};
+
+static const struct regmap_config max8649_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int max8649_regulator_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max8649_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct max8649_regulator_info *info = NULL;
+ struct regulator_dev *regulator;
+ struct regulator_config config = { };
+ unsigned int val;
+ unsigned char data;
+ int ret;
+
+ info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
+ if (IS_ERR(info->regmap)) {
+ ret = PTR_ERR(info->regmap);
+ dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
+ return ret;
+ }
+
+ info->dev = &client->dev;
+ i2c_set_clientdata(client, info);
+
+ info->mode = pdata->mode;
+ switch (info->mode) {
+ case 0:
+ dcdc_desc.vsel_reg = MAX8649_MODE0;
+ break;
+ case 1:
+ dcdc_desc.vsel_reg = MAX8649_MODE1;
+ break;
+ case 2:
+ dcdc_desc.vsel_reg = MAX8649_MODE2;
+ break;
+ case 3:
+ dcdc_desc.vsel_reg = MAX8649_MODE3;
+ break;
+ default:
+ break;
+ }
+
+ ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
+ if (ret != 0) {
+ dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
+ ret);
+ return ret;
+ }
+ dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
+
+ /* enable VID0 & VID1 */
+ regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
+
+ /* enable/disable external clock synchronization */
+ info->extclk = pdata->extclk;
+ data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
+ regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
+ MAX8649_SYNC_EXTCLK, data);
+ if (info->extclk) {
+ /* set external clock frequency */
+ info->extclk_freq = pdata->extclk_freq;
+ regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
+ info->extclk_freq << 6);
+ }
+
+ if (pdata->ramp_timing) {
+ info->ramp_timing = pdata->ramp_timing;
+ regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
+ info->ramp_timing << 5);
+ }
+
+ info->ramp_down = pdata->ramp_down;
+ if (info->ramp_down) {
+ regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
+ MAX8649_RAMP_DOWN);
+ }
+
+ config.dev = &client->dev;
+ config.init_data = pdata->regulator;
+ config.driver_data = info;
+ config.regmap = info->regmap;
+
+ regulator = devm_regulator_register(&client->dev, &dcdc_desc,
+ &config);
+ if (IS_ERR(regulator)) {
+ dev_err(info->dev, "failed to register regulator %s\n",
+ dcdc_desc.name);
+ return PTR_ERR(regulator);
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id max8649_id[] = {
+ { "max8649", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max8649_id);
+
+static struct i2c_driver max8649_driver = {
+ .probe = max8649_regulator_probe,
+ .driver = {
+ .name = "max8649",
+ },
+ .id_table = max8649_id,
+};
+
+static int __init max8649_init(void)
+{
+ return i2c_add_driver(&max8649_driver);
+}
+subsys_initcall(max8649_init);
+
+static void __exit max8649_exit(void)
+{
+ i2c_del_driver(&max8649_driver);
+}
+module_exit(max8649_exit);
+
+/* Module information */
+MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff