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authorHaojian Zhuang <haojian.zhuang@marvell.com>2010-01-11 13:10:08 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2010-03-07 22:17:08 +0100
commit08ff6f2a9908c87b0adffe6453291be22db3a62f (patch)
tree27d7cd7c2466c1339994027fb1aba88189fa6424 /drivers/regulator/max8925-regulator.c
parent4f811ef0d40048ae80b6ea77080b814725bffc58 (diff)
downloadlinaro-lsk-08ff6f2a9908c87b0adffe6453291be22db3a62f.tar.gz
regulator: Add max8925 support
MAX8925 contains 3 Buck and 20 LDO regulator. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/regulator/max8925-regulator.c')
-rw-r--r--drivers/regulator/max8925-regulator.c306
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c
new file mode 100644
index 00000000000..67873f08ed4
--- /dev/null
+++ b/drivers/regulator/max8925-regulator.c
@@ -0,0 +1,306 @@
+/*
+ * Regulators driver for Maxim max8925
+ *
+ * Copyright (C) 2009 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/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max8925.h>
+
+#define SD1_DVM_VMIN 850000
+#define SD1_DVM_VMAX 1000000
+#define SD1_DVM_STEP 50000
+#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
+#define SD1_DVM_EN 6 /* SDV1 bit 6 */
+
+struct max8925_regulator_info {
+ struct regulator_desc desc;
+ struct regulator_dev *regulator;
+ struct i2c_client *i2c;
+ struct max8925_chip *chip;
+
+ int min_uV;
+ int max_uV;
+ int step_uV;
+ int vol_reg;
+ int vol_shift;
+ int vol_nbits;
+ int enable_bit;
+ int enable_reg;
+};
+
+static inline int check_range(struct max8925_regulator_info *info,
+ int min_uV, int max_uV)
+{
+ if (min_uV < info->min_uV || min_uV > info->max_uV)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+ return info->min_uV + index * info->step_uV;
+}
+
+static int max8925_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+ unsigned char data, mask;
+
+ if (check_range(info, min_uV, max_uV)) {
+ dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
+ min_uV, max_uV);
+ return -EINVAL;
+ }
+ data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
+ data <<= info->vol_shift;
+ mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
+
+ return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
+}
+
+static int max8925_get_voltage(struct regulator_dev *rdev)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+ unsigned char data, mask;
+ int ret;
+
+ ret = max8925_reg_read(info->i2c, info->vol_reg);
+ if (ret < 0)
+ return ret;
+ mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
+ data = (ret & mask) >> info->vol_shift;
+
+ return max8925_list_voltage(rdev, data);
+}
+
+static int max8925_enable(struct regulator_dev *rdev)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+ return max8925_set_bits(info->i2c, info->enable_reg,
+ 1 << info->enable_bit,
+ 1 << info->enable_bit);
+}
+
+static int max8925_disable(struct regulator_dev *rdev)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+ return max8925_set_bits(info->i2c, info->enable_reg,
+ 1 << info->enable_bit, 0);
+}
+
+static int max8925_is_enabled(struct regulator_dev *rdev)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+ int ret;
+
+ ret = max8925_reg_read(info->i2c, info->vol_reg);
+ if (ret < 0)
+ return ret;
+
+ return ret & (1 << info->enable_bit);
+}
+
+static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+ unsigned char data, mask;
+
+ if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
+ return -EINVAL;
+
+ data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
+ data <<= SD1_DVM_SHIFT;
+ mask = 3 << SD1_DVM_SHIFT;
+
+ return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
+}
+
+static int max8925_set_dvm_enable(struct regulator_dev *rdev)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+ return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
+ 1 << SD1_DVM_EN);
+}
+
+static int max8925_set_dvm_disable(struct regulator_dev *rdev)
+{
+ struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+ return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
+}
+
+static struct regulator_ops max8925_regulator_sdv_ops = {
+ .set_voltage = max8925_set_voltage,
+ .get_voltage = max8925_get_voltage,
+ .enable = max8925_enable,
+ .disable = max8925_disable,
+ .is_enabled = max8925_is_enabled,
+ .set_suspend_voltage = max8925_set_dvm_voltage,
+ .set_suspend_enable = max8925_set_dvm_enable,
+ .set_suspend_disable = max8925_set_dvm_disable,
+};
+
+static struct regulator_ops max8925_regulator_ldo_ops = {
+ .set_voltage = max8925_set_voltage,
+ .get_voltage = max8925_get_voltage,
+ .enable = max8925_enable,
+ .disable = max8925_disable,
+ .is_enabled = max8925_is_enabled,
+};
+
+#define MAX8925_SDV(_id, min, max, step) \
+{ \
+ .desc = { \
+ .name = "SDV" #_id, \
+ .ops = &max8925_regulator_sdv_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .id = MAX8925_ID_SD##_id, \
+ .owner = THIS_MODULE, \
+ }, \
+ .min_uV = min * 1000, \
+ .max_uV = max * 1000, \
+ .step_uV = step * 1000, \
+ .vol_reg = MAX8925_SDV##_id, \
+ .vol_shift = 0, \
+ .vol_nbits = 6, \
+ .enable_reg = MAX8925_SDCTL##_id, \
+ .enable_bit = 0, \
+}
+
+#define MAX8925_LDO(_id, min, max, step) \
+{ \
+ .desc = { \
+ .name = "LDO" #_id, \
+ .ops = &max8925_regulator_ldo_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .id = MAX8925_ID_LDO##_id, \
+ .owner = THIS_MODULE, \
+ }, \
+ .min_uV = min * 1000, \
+ .max_uV = max * 1000, \
+ .step_uV = step * 1000, \
+ .vol_reg = MAX8925_LDOVOUT##_id, \
+ .vol_shift = 0, \
+ .vol_nbits = 6, \
+ .enable_reg = MAX8925_LDOCTL##_id, \
+ .enable_bit = 0, \
+}
+
+static struct max8925_regulator_info max8925_regulator_info[] = {
+ MAX8925_SDV(1, 637.5, 1425, 12.5),
+ MAX8925_SDV(2, 650, 2225, 25),
+ MAX8925_SDV(3, 750, 3900, 50),
+
+ MAX8925_LDO(1, 750, 3900, 50),
+ MAX8925_LDO(2, 650, 2250, 25),
+ MAX8925_LDO(3, 650, 2250, 25),
+ MAX8925_LDO(4, 750, 3900, 50),
+ MAX8925_LDO(5, 750, 3900, 50),
+ MAX8925_LDO(6, 750, 3900, 50),
+ MAX8925_LDO(7, 750, 3900, 50),
+ MAX8925_LDO(8, 750, 3900, 50),
+ MAX8925_LDO(9, 750, 3900, 50),
+ MAX8925_LDO(10, 750, 3900, 50),
+ MAX8925_LDO(11, 750, 3900, 50),
+ MAX8925_LDO(12, 750, 3900, 50),
+ MAX8925_LDO(13, 750, 3900, 50),
+ MAX8925_LDO(14, 750, 3900, 50),
+ MAX8925_LDO(15, 750, 3900, 50),
+ MAX8925_LDO(16, 750, 3900, 50),
+ MAX8925_LDO(17, 650, 2250, 25),
+ MAX8925_LDO(18, 650, 2250, 25),
+ MAX8925_LDO(19, 750, 3900, 50),
+ MAX8925_LDO(20, 750, 3900, 50),
+};
+
+static inline struct max8925_regulator_info *find_regulator_info(int id)
+{
+ struct max8925_regulator_info *ri;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
+ ri = &max8925_regulator_info[i];
+ if (ri->desc.id == id)
+ return ri;
+ }
+ return NULL;
+}
+
+static int __devinit max8925_regulator_probe(struct platform_device *pdev)
+{
+ struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct max8925_platform_data *pdata = chip->dev->platform_data;
+ struct max8925_regulator_info *ri = NULL;
+ struct regulator_dev *rdev;
+
+ ri = find_regulator_info(pdev->id);
+ if (ri == NULL) {
+ dev_err(&pdev->dev, "invalid regulator ID specified\n");
+ return -EINVAL;
+ }
+ ri->i2c = chip->i2c;
+ ri->chip = chip;
+
+ rdev = regulator_register(&ri->desc, &pdev->dev,
+ pdata->regulator[pdev->id], ri);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "failed to register regulator %s\n",
+ ri->desc.name);
+ return PTR_ERR(rdev);
+ }
+
+ platform_set_drvdata(pdev, rdev);
+ return 0;
+}
+
+static int __devexit max8925_regulator_remove(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+ regulator_unregister(rdev);
+ return 0;
+}
+
+static struct platform_driver max8925_regulator_driver = {
+ .driver = {
+ .name = "max8925-regulator",
+ .owner = THIS_MODULE,
+ },
+ .probe = max8925_regulator_probe,
+ .remove = __devexit_p(max8925_regulator_remove),
+};
+
+static int __init max8925_regulator_init(void)
+{
+ return platform_driver_register(&max8925_regulator_driver);
+}
+subsys_initcall(max8925_regulator_init);
+
+static void __exit max8925_regulator_exit(void)
+{
+ platform_driver_unregister(&max8925_regulator_driver);
+}
+module_exit(max8925_regulator_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
+MODULE_ALIAS("platform:max8925-regulator");
+