regulator: PCF50633 pmic driver

Changes from V1:
	- Removed support for suspend_enable & suspend_disable functions.

Signed-off-by: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

1 files changed, 329 insertions, 0 deletions

diff --git a/drivers/regulator/pcf50633-regulator.c b/drivers/regulator/pcf50633-regulator.c
new file mode 100644
index 000000000000..4cc85ec6e120
--- /dev/null
+++ b/drivers/regulator/pcf50633-regulator.c
@@ -0,0 +1,329 @@
+/* NXP PCF50633 PMIC Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50633 driver mainly by
+ * Harald Welte and Andy Green and Werner Almesberger
+ *
+ *  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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/pcf50633/core.h>
+#include <linux/mfd/pcf50633/pmic.h>
+
+#define PCF50633_REGULATOR(_name, _id)          \
+        {                                       \
+                .name = _name,                  \
+                .id = _id,                      \
+                .ops = &pcf50633_regulator_ops, \
+                .type = REGULATOR_VOLTAGE,      \
+                .owner = THIS_MODULE,           \
+        }
+
+static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
+        [PCF50633_REGULATOR_AUTO]       = PCF50633_REG_AUTOOUT,
+        [PCF50633_REGULATOR_DOWN1]      = PCF50633_REG_DOWN1OUT,
+        [PCF50633_REGULATOR_DOWN2]      = PCF50633_REG_DOWN2OUT,
+        [PCF50633_REGULATOR_MEMLDO]     = PCF50633_REG_MEMLDOOUT,
+        [PCF50633_REGULATOR_LDO1]       = PCF50633_REG_LDO1OUT,
+        [PCF50633_REGULATOR_LDO2]       = PCF50633_REG_LDO2OUT,
+        [PCF50633_REGULATOR_LDO3]       = PCF50633_REG_LDO3OUT,
+        [PCF50633_REGULATOR_LDO4]       = PCF50633_REG_LDO4OUT,
+        [PCF50633_REGULATOR_LDO5]       = PCF50633_REG_LDO5OUT,
+        [PCF50633_REGULATOR_LDO6]       = PCF50633_REG_LDO6OUT,
+        [PCF50633_REGULATOR_HCLDO]      = PCF50633_REG_HCLDOOUT,
+};
+
+/* Bits from voltage value */
+static u8 auto_voltage_bits(unsigned int millivolts)
+{
+        if (millivolts < 1800)
+                return 0;
+        if (millivolts > 3800)
+                return 0xff;
+
+        millivolts -= 625;
+
+        return millivolts / 25;
+}
+
+static u8 down_voltage_bits(unsigned int millivolts)
+{
+        if (millivolts < 625)
+                return 0;
+        else if (millivolts > 3000)
+                return 0xff;
+
+        millivolts -= 625;
+
+        return millivolts / 25;
+}
+
+static u8 ldo_voltage_bits(unsigned int millivolts)
+{
+        if (millivolts < 900)
+                return 0;
+        else if (millivolts > 3600)
+                return 0x1f;
+
+        millivolts -= 900;
+        return millivolts / 100;
+}
+
+/* Obtain voltage value from bits */
+static unsigned int auto_voltage_value(u8 bits)
+{
+        if (bits < 0x2f)
+                return 0;
+
+        return 625 + (bits * 25);
+}
+
+
+static unsigned int down_voltage_value(u8 bits)
+{
+        return 625 + (bits * 25);
+}
+
+
+static unsigned int ldo_voltage_value(u8 bits)
+{
+        bits &= 0x1f;
+
+        return 900 + (bits * 100);
+}
+
+static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
+                                                int min_uV, int max_uV)
+{
+        struct pcf50633 *pcf;
+        int regulator_id, millivolts;
+        u8 volt_bits, regnr;
+
+        pcf = rdev_get_drvdata(rdev);
+
+        regulator_id = rdev_get_id(rdev);
+        if (regulator_id >= PCF50633_NUM_REGULATORS)
+                return -EINVAL;
+
+        millivolts = min_uV / 1000;
+
+        regnr = pcf50633_regulator_registers[regulator_id];
+
+        switch (regulator_id) {
+        case PCF50633_REGULATOR_AUTO:
+                volt_bits = auto_voltage_bits(millivolts);
+                break;
+        case PCF50633_REGULATOR_DOWN1:
+                volt_bits = down_voltage_bits(millivolts);
+                break;
+        case PCF50633_REGULATOR_DOWN2:
+                volt_bits = down_voltage_bits(millivolts);
+                break;
+        case PCF50633_REGULATOR_LDO1:
+        case PCF50633_REGULATOR_LDO2:
+        case PCF50633_REGULATOR_LDO3:
+        case PCF50633_REGULATOR_LDO4:
+        case PCF50633_REGULATOR_LDO5:
+        case PCF50633_REGULATOR_LDO6:
+        case PCF50633_REGULATOR_HCLDO:
+                volt_bits = ldo_voltage_bits(millivolts);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return pcf50633_reg_write(pcf, regnr, volt_bits);
+}
+
+static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
+{
+        struct pcf50633 *pcf;
+        int regulator_id, millivolts, volt_bits;
+        u8 regnr;
+
+        pcf = rdev_get_drvdata(rdev);;
+
+        regulator_id = rdev_get_id(rdev);
+        if (regulator_id >= PCF50633_NUM_REGULATORS)
+                return -EINVAL;
+
+        regnr = pcf50633_regulator_registers[regulator_id];
+
+        volt_bits = pcf50633_reg_read(pcf, regnr);
+        if (volt_bits < 0)
+                return -1;
+
+        switch (regulator_id) {
+        case PCF50633_REGULATOR_AUTO:
+                millivolts = auto_voltage_value(volt_bits);
+                break;
+        case PCF50633_REGULATOR_DOWN1:
+                millivolts = down_voltage_value(volt_bits);
+                break;
+        case PCF50633_REGULATOR_DOWN2:
+                millivolts = down_voltage_value(volt_bits);
+                break;
+        case PCF50633_REGULATOR_LDO1:
+        case PCF50633_REGULATOR_LDO2:
+        case PCF50633_REGULATOR_LDO3:
+        case PCF50633_REGULATOR_LDO4:
+        case PCF50633_REGULATOR_LDO5:
+        case PCF50633_REGULATOR_LDO6:
+        case PCF50633_REGULATOR_HCLDO:
+                millivolts = ldo_voltage_value(volt_bits);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return millivolts * 1000;
+}
+
+static int pcf50633_regulator_enable(struct regulator_dev *rdev)
+{
+        struct pcf50633 *pcf = rdev_get_drvdata(rdev);
+        int regulator_id;
+        u8 regnr;
+
+        regulator_id = rdev_get_id(rdev);
+        if (regulator_id >= PCF50633_NUM_REGULATORS)
+                return -EINVAL;
+
+        /* The *ENA register is always one after the *OUT register */
+        regnr = pcf50633_regulator_registers[regulator_id] + 1;
+
+        return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
+                                                       PCF50633_REGULATOR_ON);
+}
+
+static int pcf50633_regulator_disable(struct regulator_dev *rdev)
+{
+        struct pcf50633 *pcf = rdev_get_drvdata(rdev);
+        int regulator_id;
+        u8 regnr;
+
+        regulator_id = rdev_get_id(rdev);
+        if (regulator_id >= PCF50633_NUM_REGULATORS)
+                return -EINVAL;
+
+        /* the *ENA register is always one after the *OUT register */
+        regnr = pcf50633_regulator_registers[regulator_id] + 1;
+
+        return pcf50633_reg_set_bit_mask(pcf, regnr,
+                                        PCF50633_REGULATOR_ON, 0);
+}
+
+static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
+{
+        struct pcf50633 *pcf = rdev_get_drvdata(rdev);
+        int regulator_id = rdev_get_id(rdev);
+        u8 regnr;
+
+        regulator_id = rdev_get_id(rdev);
+        if (regulator_id >= PCF50633_NUM_REGULATORS)
+                return -EINVAL;
+
+        /* the *ENA register is always one after the *OUT register */
+        regnr = pcf50633_regulator_registers[regulator_id] + 1;
+
+        return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
+}
+
+static struct regulator_ops pcf50633_regulator_ops = {
+        .set_voltage = pcf50633_regulator_set_voltage,
+        .get_voltage = pcf50633_regulator_get_voltage,
+        .enable = pcf50633_regulator_enable,
+        .disable = pcf50633_regulator_disable,
+        .is_enabled = pcf50633_regulator_is_enabled,
+};
+
+static struct regulator_desc regulators[] = {
+        [PCF50633_REGULATOR_AUTO] =
+                PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
+        [PCF50633_REGULATOR_DOWN1] =
+                PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
+        [PCF50633_REGULATOR_DOWN2] =
+                PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
+        [PCF50633_REGULATOR_LDO1] =
+                PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
+        [PCF50633_REGULATOR_LDO2] =
+                PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
+        [PCF50633_REGULATOR_LDO3] =
+                PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
+        [PCF50633_REGULATOR_LDO4] =
+                PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
+        [PCF50633_REGULATOR_LDO5] =
+                PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
+        [PCF50633_REGULATOR_LDO6] =
+                PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
+        [PCF50633_REGULATOR_HCLDO] =
+                PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
+        [PCF50633_REGULATOR_MEMLDO] =
+                PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
+};
+
+static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
+{
+        struct regulator_dev *rdev;
+        struct pcf50633 *pcf;
+
+        /* Already set by core driver */
+        pcf = platform_get_drvdata(pdev);
+
+        rdev = regulator_register(&regulators[pdev->id], &pdev->dev, pcf);
+        if (IS_ERR(rdev))
+                return PTR_ERR(rdev);
+
+        if (pcf->pdata->regulator_registered)
+                pcf->pdata->regulator_registered(pcf, pdev->id);
+
+        return 0;
+}
+
+static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
+{
+        struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+        regulator_unregister(rdev);
+
+        return 0;
+}
+
+static struct platform_driver pcf50633_regulator_driver = {
+        .driver = {
+                .name = "pcf50633-regltr",
+        },
+        .probe = pcf50633_regulator_probe,
+        .remove = __devexit_p(pcf50633_regulator_remove),
+};
+
+static int __init pcf50633_regulator_init(void)
+{
+        return platform_driver_register(&pcf50633_regulator_driver);
+}
+module_init(pcf50633_regulator_init);
+
+static void __exit pcf50633_regulator_exit(void)
+{
+        platform_driver_unregister(&pcf50633_regulator_driver);
+}
+module_exit(pcf50633_regulator_exit);
+
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_DESCRIPTION("PCF50633 regulator driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcf50633-regulator");