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path: root/drivers/regulator/pcf50606-regulator.c
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Diffstat (limited to 'drivers/regulator/pcf50606-regulator.c')
-rw-r--r--drivers/regulator/pcf50606-regulator.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/regulator/pcf50606-regulator.c b/drivers/regulator/pcf50606-regulator.c
new file mode 100644
index 00000000000..58d020ef93c
--- /dev/null
+++ b/drivers/regulator/pcf50606-regulator.c
@@ -0,0 +1,381 @@
+/* NXP PCF50606 PMIC Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50606 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/pcf50606/core.h>
+#include <linux/mfd/pcf50606/pmic.h>
+
+#define PCF50606_REGULATOR(_name, _id) \
+ { \
+ .name = _name, \
+ .id = _id, \
+ .ops = &pcf50606_regulator_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }
+
+static const u8 pcf50606_regulator_registers[PCF50606_NUM_REGULATORS] = {
+ [PCF50606_REGULATOR_DCD] = PCF50606_REG_DCDC1,
+ [PCF50606_REGULATOR_DCDE] = PCF50606_REG_DCDEC1,
+ [PCF50606_REGULATOR_DCUD] = PCF50606_REG_DCUDC1,
+ [PCF50606_REGULATOR_D1REG] = PCF50606_REG_D1REGC1,
+ [PCF50606_REGULATOR_D2REG] = PCF50606_REG_D2REGC1,
+ [PCF50606_REGULATOR_D3REG] = PCF50606_REG_D3REGC1,
+ [PCF50606_REGULATOR_LPREG] = PCF50606_REG_LPREGC1,
+ [PCF50606_REGULATOR_IOREG] = PCF50606_REG_IOREGC,
+};
+
+static u8 dcudc_voltage(unsigned int millivolts)
+{
+ if (millivolts < 900)
+ return 0;
+ if (millivolts > 5500)
+ return 0x1f;
+ if (millivolts <= 3300) {
+ millivolts -= 900;
+ return millivolts/300;
+ }
+ if (millivolts < 4000)
+ return 0x0f;
+ else {
+ millivolts -= 4000;
+ return millivolts/100;
+ }
+}
+
+static unsigned int dcudc_2voltage(u8 bits)
+{
+ bits &= 0x1f;
+ if (bits < 0x08)
+ return 900 + bits * 300;
+ else if (bits < 0x10)
+ return 3300;
+ else
+ return 4000 + bits * 100;
+}
+
+static u8 dcdec_voltage(unsigned int millivolts)
+{
+ if (millivolts < 900)
+ return 0;
+ else if (millivolts > 3300)
+ return 0x0f;
+
+ millivolts -= 900;
+ return millivolts/300;
+}
+
+static unsigned int dcdec_2voltage(u8 bits)
+{
+ bits &= 0x0f;
+ return 900 + bits*300;
+}
+
+static u8 dcdc_voltage(unsigned int millivolts)
+{
+ if (millivolts < 900)
+ return 0;
+ else if (millivolts > 3600)
+ return 0x1f;
+
+ if (millivolts < 1500) {
+ millivolts -= 900;
+ return millivolts/25;
+ } else {
+ millivolts -= 1500;
+ return 0x18 + millivolts/300;
+ }
+}
+
+static unsigned int dcdc_2voltage(u8 bits)
+{
+ bits &= 0x1f;
+ if ((bits & 0x18) == 0x18)
+ return 1500 + ((bits & 0x7) * 300);
+ else
+ return 900 + (bits * 25);
+}
+
+static u8 dx_voltage(unsigned int millivolts)
+{
+ if (millivolts < 900)
+ return 0;
+ else if (millivolts > 3300)
+ return 0x18;
+
+ millivolts -= 900;
+ return millivolts/100;
+}
+
+static unsigned int dx_2voltage(u8 bits)
+{
+ bits &= 0x1f;
+ return 900 + (bits * 100);
+}
+
+static int pcf50606_regulator_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ struct pcf50606 *pcf;
+ int regulator_id, millivolts, rc;
+ u8 volt_bits, regnr;
+
+ pcf = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= PCF50606_NUM_REGULATORS)
+ return -EINVAL;
+
+ millivolts = min_uV / 1000;
+
+ switch (regulator_id) {
+ case PCF50606_REGULATOR_DCD:
+ volt_bits = dcdc_voltage(millivolts);
+ rc = pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_DCDC1, 0x1f,
+ volt_bits);
+ break;
+ case PCF50606_REGULATOR_DCDE:
+ volt_bits = dcdec_voltage(millivolts);
+ rc = pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_DCDEC1, 0x0f,
+ volt_bits);
+ break;
+ case PCF50606_REGULATOR_DCUD:
+ volt_bits = dcudc_voltage(millivolts);
+ rc = pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_DCUDC1, 0x1f,
+ volt_bits);
+ break;
+ case PCF50606_REGULATOR_D1REG:
+ case PCF50606_REGULATOR_D2REG:
+ case PCF50606_REGULATOR_D3REG:
+ regnr = PCF50606_REG_D1REGC1 +
+ (regulator_id - PCF50606_REGULATOR_D1REG);
+ volt_bits = dx_voltage(millivolts);
+ rc = pcf50606_reg_set_bit_mask(pcf, regnr, 0x1f, volt_bits);
+ break;
+ case PCF50606_REGULATOR_LPREG:
+ volt_bits = dx_voltage(millivolts);
+ rc = pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_LPREGC1, 0x1f,
+ volt_bits);
+ break;
+ case PCF50606_REGULATOR_IOREG:
+ if (millivolts < 1800)
+ return -EINVAL;
+ volt_bits = dx_voltage(millivolts);
+ rc = pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_IOREGC, 0x1f,
+ volt_bits);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return rc;
+}
+
+static int pcf50606_regulator_get_voltage(struct regulator_dev *rdev)
+{
+ struct pcf50606 *pcf;
+ u8 volt_bits, regnr;
+ int rc = 0, regulator_id;
+
+
+ pcf = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= PCF50606_NUM_REGULATORS)
+ return -EINVAL;
+
+ switch (regulator_id) {
+ case PCF50606_REGULATOR_DCD:
+ volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_DCDC1) & 0x1f;
+ rc = dcdc_2voltage(volt_bits);
+ break;
+ case PCF50606_REGULATOR_DCDE:
+ volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_DCDEC1) & 0x0f;
+ rc = dcdec_2voltage(volt_bits);
+ break;
+ case PCF50606_REGULATOR_DCUD:
+ volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_DCUDC1) & 0x1f;
+ rc = dcudc_2voltage(volt_bits);
+ break;
+ case PCF50606_REGULATOR_D1REG:
+ case PCF50606_REGULATOR_D2REG:
+ case PCF50606_REGULATOR_D3REG:
+ regnr = PCF50606_REG_D1REGC1 + (regulator_id - PCF50606_REGULATOR_D1REG);
+ volt_bits = pcf50606_reg_read(pcf, regnr) & 0x1f;
+ if (volt_bits > 0x18)
+ volt_bits = 0x18;
+ rc = dx_2voltage(volt_bits);
+ break;
+ case PCF50606_REGULATOR_LPREG:
+ volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_LPREGC1) & 0x1f;
+ if (volt_bits > 0x18)
+ volt_bits = 0x18;
+ rc = dx_2voltage(volt_bits);
+ break;
+ case PCF50606_REGULATOR_IOREG:
+ volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_IOREGC) & 0x1f;
+ if (volt_bits > 0x18)
+ volt_bits = 0x18;
+ rc = dx_2voltage(volt_bits);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return rc * 1000;
+
+}
+
+static int pcf50606_regulator_enable(struct regulator_dev *rdev)
+{
+ struct pcf50606 *pcf = rdev_get_drvdata(rdev);
+ int regulator_id;
+ u8 regnr;
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= PCF50606_NUM_REGULATORS)
+ return -EINVAL;
+
+ regnr = pcf50606_regulator_registers[regulator_id];
+
+ return pcf50606_reg_set_bit_mask(pcf, regnr, 0xe0, 0xe0);
+}
+
+static int pcf50606_regulator_disable(struct regulator_dev *rdev)
+{
+ struct pcf50606 *pcf = rdev_get_drvdata(rdev);
+ int regulator_id;
+ u8 regnr;
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= PCF50606_NUM_REGULATORS)
+ return -EINVAL;
+
+ /* IOREG cannot be powered off since it powers the PMU I2C */
+ if (regulator_id == PCF50606_REGULATOR_IOREG)
+ return -EINVAL;
+
+ regnr = pcf50606_regulator_registers[regulator_id];
+
+ return pcf50606_reg_set_bit_mask(pcf, regnr, 0xe0, 0);
+}
+
+static int pcf50606_regulator_is_enabled(struct regulator_dev *rdev)
+{
+ struct pcf50606 *pcf = rdev_get_drvdata(rdev);
+ int regulator_id = rdev_get_id(rdev);
+ u8 regnr, val;
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= PCF50606_NUM_REGULATORS)
+ return -EINVAL;
+
+ /* the *ENA register is always one after the *OUT register */
+ regnr = pcf50606_regulator_registers[regulator_id];
+ val = (pcf50606_reg_read(pcf, regnr) & 0xe0) >> 5;
+
+ /* PWREN1 = 1, PWREN2 = 1, see table 16 of datasheet */
+ if (val == 0 || val == 5)
+ return 0;
+
+ return 1;
+}
+
+static struct regulator_ops pcf50606_regulator_ops = {
+ .set_voltage = pcf50606_regulator_set_voltage,
+ .get_voltage = pcf50606_regulator_get_voltage,
+ .enable = pcf50606_regulator_enable,
+ .disable = pcf50606_regulator_disable,
+ .is_enabled = pcf50606_regulator_is_enabled,
+};
+
+static struct regulator_desc regulators[] = {
+ [PCF50606_REGULATOR_DCD] =
+ PCF50606_REGULATOR("dcd", PCF50606_REGULATOR_DCD),
+ [PCF50606_REGULATOR_DCDE] =
+ PCF50606_REGULATOR("dcde", PCF50606_REGULATOR_DCDE),
+ [PCF50606_REGULATOR_DCUD] =
+ PCF50606_REGULATOR("dcud", PCF50606_REGULATOR_DCUD),
+ [PCF50606_REGULATOR_D1REG] =
+ PCF50606_REGULATOR("d1reg", PCF50606_REGULATOR_D1REG),
+ [PCF50606_REGULATOR_D2REG] =
+ PCF50606_REGULATOR("d2reg", PCF50606_REGULATOR_D2REG),
+ [PCF50606_REGULATOR_D3REG] =
+ PCF50606_REGULATOR("d3reg", PCF50606_REGULATOR_D3REG),
+ [PCF50606_REGULATOR_LPREG] =
+ PCF50606_REGULATOR("lpreg", PCF50606_REGULATOR_LPREG),
+ [PCF50606_REGULATOR_IOREG] =
+ PCF50606_REGULATOR("ioreg", PCF50606_REGULATOR_IOREG),
+};
+
+static int __devinit pcf50606_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev;
+ struct pcf50606 *pcf;
+
+ /* Already set by core driver */
+ pcf = platform_get_drvdata(pdev);
+
+ rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
+ pdev->dev.platform_data, 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 pcf50606_regulator_remove(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+ regulator_unregister(rdev);
+
+ return 0;
+}
+
+static struct platform_driver pcf50606_regulator_driver = {
+ .driver = {
+ .name = "pcf50606-regltr",
+ },
+ .probe = pcf50606_regulator_probe,
+ .remove = __devexit_p(pcf50606_regulator_remove),
+};
+
+static int __init pcf50606_regulator_init(void)
+{
+ return platform_driver_register(&pcf50606_regulator_driver);
+}
+module_init(pcf50606_regulator_init);
+
+static void __exit pcf50606_regulator_exit(void)
+{
+ platform_driver_unregister(&pcf50606_regulator_driver);
+}
+module_exit(pcf50606_regulator_exit);
+
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_DESCRIPTION("PCF50606 regulator driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcf50606-regulator");