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linux/drivers/regulator/pcap-regulator.c
Daniel Ribeiro 39b1772a24 regulator: add pcap driver 
Add (partial) support for the voltage regulators on the PCAP2 PMIC.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-09-17 09:46:49 +02:00

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/*
* PCAP2 Regulator Driver
*
* Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/ezx-pcap.h>
static const u16 V1_table[] = {
2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275,
};
static const u16 V2_table[] = {
2500, 2775,
};
static const u16 V3_table[] = {
1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275,
};
static const u16 V4_table[] = {
1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775,
};
static const u16 V5_table[] = {
1875, 2275, 2475, 2775,
};
static const u16 V6_table[] = {
2475, 2775,
};
static const u16 V7_table[] = {
1875, 2775,
};
#define V8_table V4_table
static const u16 V9_table[] = {
1575, 1875, 2475, 2775,
};
static const u16 V10_table[] = {
5000,
};
static const u16 VAUX1_table[] = {
1875, 2475, 2775, 3000,
};
#define VAUX2_table VAUX1_table
static const u16 VAUX3_table[] = {
1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000,
2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600,
};
static const u16 VAUX4_table[] = {
1800, 1800, 3000, 5000,
};
static const u16 VSIM_table[] = {
1875, 3000,
};
static const u16 VSIM2_table[] = {
1875,
};
static const u16 VVIB_table[] = {
1300, 1800, 2000, 3000,
};
static const u16 SW1_table[] = {
900, 950, 1000, 1050, 1100, 1150, 1200, 1250,
1300, 1350, 1400, 1450, 1500, 1600, 1875, 2250,
};
#define SW2_table SW1_table
static const u16 SW3_table[] = {
4000, 4500, 5000, 5500,
};
struct pcap_regulator {
const u8 reg;
const u8 en;
const u8 index;
const u8 stby;
const u8 lowpwr;
const u8 n_voltages;
const u16 *voltage_table;
};
#define NA 0xff
#define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr) \
[_vreg] = { \
.reg = _reg, \
.en = _en, \
.index = _index, \
.stby = _stby, \
.lowpwr = _lowpwr, \
.n_voltages = ARRAY_SIZE(_vreg##_table), \
.voltage_table = _vreg##_table, \
}
static struct pcap_regulator vreg_table[] = {
VREG_INFO(V1, PCAP_REG_VREG1, 1, 2, 18, 0),
VREG_INFO(V2, PCAP_REG_VREG1, 5, 6, 19, 22),
VREG_INFO(V3, PCAP_REG_VREG1, 7, 8, 20, 23),
VREG_INFO(V4, PCAP_REG_VREG1, 11, 12, 21, 24),
/* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
VREG_INFO(V5, PCAP_REG_VREG1, 15, 16, 12, 19),
VREG_INFO(V6, PCAP_REG_VREG2, 1, 2, 14, 20),
VREG_INFO(V7, PCAP_REG_VREG2, 3, 4, 15, 21),
VREG_INFO(V8, PCAP_REG_VREG2, 5, 6, 16, 22),
VREG_INFO(V9, PCAP_REG_VREG2, 9, 10, 17, 23),
VREG_INFO(V10, PCAP_REG_VREG2, 10, NA, 18, 24),
VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1, 2, 22, 23),
/* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4, 5, 0, 1),
VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7, 8, 2, 3),
VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4, 5),
VREG_INFO(VSIM, PCAP_REG_AUXVREG, 17, 18, NA, 6),
VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
VREG_INFO(VVIB, PCAP_REG_AUXVREG, 19, 20, NA, NA),
VREG_INFO(SW1, PCAP_REG_SWCTRL, 1, 2, NA, NA),
VREG_INFO(SW2, PCAP_REG_SWCTRL, 6, 7, NA, NA),
/* SW3 STBY is on PCAP_REG_AUXVREG */
VREG_INFO(SW3, PCAP_REG_SWCTRL, 11, 12, 24, NA),
/* SWxS used to control SWx voltage on standby */
/* VREG_INFO(SW1S, PCAP_REG_LOWPWR, NA, 12, NA, NA),
VREG_INFO(SW2S, PCAP_REG_LOWPWR, NA, 20, NA, NA), */
};
static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
void *pcap = rdev_get_drvdata(rdev);
int uV;
u8 i;
/* the regulator doesn't support voltage switching */
if (vreg->n_voltages == 1)
return -EINVAL;
for (i = 0; i < vreg->n_voltages; i++) {
/* For V1 the first is not the best match */
if (i == 0 && rdev_get_id(rdev) == V1)
i = 1;
else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1)
i = 0;
uV = vreg->voltage_table[i] * 1000;
if (min_uV <= uV && uV <= max_uV)
return ezx_pcap_set_bits(pcap, vreg->reg,
(vreg->n_voltages - 1) << vreg->index,
i << vreg->index);
if (i == 0 && rdev_get_id(rdev) == V1)
i = vreg->n_voltages - 1;
}
/* the requested voltage range is not supported by this regulator */
return -EINVAL;
}
static int pcap_regulator_get_voltage(struct regulator_dev *rdev)
{
struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
void *pcap = rdev_get_drvdata(rdev);
u32 tmp;
int mV;
if (vreg->n_voltages == 1)
return vreg->voltage_table[0] * 1000;
ezx_pcap_read(pcap, vreg->reg, &tmp);
tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1));
mV = vreg->voltage_table[tmp];
return mV * 1000;
}
static int pcap_regulator_enable(struct regulator_dev *rdev)
{
struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
void *pcap = rdev_get_drvdata(rdev);
if (vreg->en == NA)
return -EINVAL;
return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
}
static int pcap_regulator_disable(struct regulator_dev *rdev)
{
struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
void *pcap = rdev_get_drvdata(rdev);
if (vreg->en == NA)
return -EINVAL;
return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
}
static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
{
struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
void *pcap = rdev_get_drvdata(rdev);
u32 tmp;
if (vreg->en == NA)
return -EINVAL;
ezx_pcap_read(pcap, vreg->reg, &tmp);
return (tmp >> vreg->en) & 1;
}
static int pcap_regulator_list_voltage(struct regulator_dev *rdev,
unsigned int index)
{
struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
return vreg->voltage_table[index] * 1000;
}
static struct regulator_ops pcap_regulator_ops = {
.list_voltage = pcap_regulator_list_voltage,
.set_voltage = pcap_regulator_set_voltage,
.get_voltage = pcap_regulator_get_voltage,
.enable = pcap_regulator_enable,
.disable = pcap_regulator_disable,
.is_enabled = pcap_regulator_is_enabled,
};
#define VREG(_vreg) \
[_vreg] = { \
.name = #_vreg, \
.id = _vreg, \
.n_voltages = ARRAY_SIZE(_vreg##_table), \
.ops = &pcap_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}
static struct regulator_desc pcap_regulators[] = {
VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
};
static int __devinit pcap_regulator_probe(struct platform_device *pdev)
{
struct regulator_dev *rdev;
void *pcap = platform_get_drvdata(pdev);
rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev,
pdev->dev.platform_data, pcap);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
platform_set_drvdata(pdev, rdev);
return 0;
}
static int __devexit pcap_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
regulator_unregister(rdev);
return 0;
}
static struct platform_driver pcap_regulator_driver = {
.driver = {
.name = "pcap-regulator",
},
.probe = pcap_regulator_probe,
.remove = __devexit_p(pcap_regulator_remove),
};
static int __init pcap_regulator_init(void)
{
return platform_driver_register(&pcap_regulator_driver);
}
static void __exit pcap_regulator_exit(void)
{
platform_driver_unregister(&pcap_regulator_driver);
}
module_init(pcap_regulator_init);
module_exit(pcap_regulator_exit);
MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
MODULE_DESCRIPTION("PCAP2 Regulator Driver");
MODULE_LICENSE("GPL");
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