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linux/drivers/regulator/wm8350-regulator.c

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regulator: Add WM8350 regulator support The WM8350 features six DCDC convertors (four buck and two boost), four LDO voltage regulators and two constant current sinks. This driver adds support for these through the regulator API. This driver was written by Liam Girdwood with updates for submission from Mark Brown. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2008-10-10 18:58:15 +04:00
/*
* wm8350.c -- Voltage and current regulation for the Wolfson WM8350 PMIC
*
* Copyright 2007, 2008 Wolfson Microelectronics PLC.
*
* Author: Liam Girdwood
* linux@wolfsonmicro.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/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/pmic.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
/* Microamps */
static const int isink_cur[] = {
4,
5,
6,
7,
8,
10,
11,
14,
16,
19,
23,
27,
32,
39,
46,
54,
65,
77,
92,
109,
130,
154,
183,
218,
259,
308,
367,
436,
518,
616,
733,
872,
1037,
1233,
1466,
1744,
2073,
2466,
2933,
3487,
4147,
4932,
5865,
6975,
8294,
9864,
11730,
13949,
16589,
19728,
23460,
27899,
33178,
39455,
46920,
55798,
66355,
78910,
93840,
111596,
132710,
157820,
187681,
223191
};
static int get_isink_val(int min_uA, int max_uA, u16 *setting)
{
int i;
for (i = ARRAY_SIZE(isink_cur) - 1; i >= 0; i--) {
if (min_uA <= isink_cur[i] && max_uA >= isink_cur[i]) {
*setting = i;
return 0;
}
}
return -EINVAL;
}
static inline int wm8350_ldo_val_to_mvolts(unsigned int val)
{
if (val < 16)
return (val * 50) + 900;
else
return ((val - 16) * 100) + 1800;
}
static inline unsigned int wm8350_ldo_mvolts_to_val(int mV)
{
if (mV < 1800)
return (mV - 900) / 50;
else
return ((mV - 1800) / 100) + 16;
}
static inline int wm8350_dcdc_val_to_mvolts(unsigned int val)
{
return (val * 25) + 850;
}
static inline unsigned int wm8350_dcdc_mvolts_to_val(int mV)
{
return (mV - 850) / 25;
}
static int wm8350_isink_set_current(struct regulator_dev *rdev, int min_uA,
int max_uA)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int isink = rdev_get_id(rdev);
u16 val, setting;
int ret;
ret = get_isink_val(min_uA, max_uA, &setting);
if (ret != 0)
return ret;
switch (isink) {
case WM8350_ISINK_A:
val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_A) &
~WM8350_CS1_ISEL_MASK;
wm8350_reg_write(wm8350, WM8350_CURRENT_SINK_DRIVER_A,
val | setting);
break;
case WM8350_ISINK_B:
val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_B) &
~WM8350_CS1_ISEL_MASK;
wm8350_reg_write(wm8350, WM8350_CURRENT_SINK_DRIVER_B,
val | setting);
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8350_isink_get_current(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int isink = rdev_get_id(rdev);
u16 val;
switch (isink) {
case WM8350_ISINK_A:
val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_A) &
WM8350_CS1_ISEL_MASK;
break;
case WM8350_ISINK_B:
val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_B) &
WM8350_CS1_ISEL_MASK;
break;
default:
return 0;
}
return (isink_cur[val] + 50) / 100;
}
/* turn on ISINK followed by DCDC */
static int wm8350_isink_enable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int isink = rdev_get_id(rdev);
switch (isink) {
case WM8350_ISINK_A:
switch (wm8350->pmic.isink_A_dcdc) {
case WM8350_DCDC_2:
case WM8350_DCDC_5:
wm8350_set_bits(wm8350, WM8350_POWER_MGMT_7,
WM8350_CS1_ENA);
wm8350_set_bits(wm8350, WM8350_CSA_FLASH_CONTROL,
WM8350_CS1_DRIVE);
wm8350_set_bits(wm8350, WM8350_DCDC_LDO_REQUESTED,
1 << (wm8350->pmic.isink_A_dcdc -
WM8350_DCDC_1));
break;
default:
return -EINVAL;
}
break;
case WM8350_ISINK_B:
switch (wm8350->pmic.isink_B_dcdc) {
case WM8350_DCDC_2:
case WM8350_DCDC_5:
wm8350_set_bits(wm8350, WM8350_POWER_MGMT_7,
WM8350_CS2_ENA);
wm8350_set_bits(wm8350, WM8350_CSB_FLASH_CONTROL,
WM8350_CS2_DRIVE);
wm8350_set_bits(wm8350, WM8350_DCDC_LDO_REQUESTED,
1 << (wm8350->pmic.isink_B_dcdc -
WM8350_DCDC_1));
break;
default:
return -EINVAL;
}
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8350_isink_disable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int isink = rdev_get_id(rdev);
switch (isink) {
case WM8350_ISINK_A:
switch (wm8350->pmic.isink_A_dcdc) {
case WM8350_DCDC_2:
case WM8350_DCDC_5:
wm8350_clear_bits(wm8350, WM8350_DCDC_LDO_REQUESTED,
1 << (wm8350->pmic.isink_A_dcdc -
WM8350_DCDC_1));
wm8350_clear_bits(wm8350, WM8350_POWER_MGMT_7,
WM8350_CS1_ENA);
break;
default:
return -EINVAL;
}
break;
case WM8350_ISINK_B:
switch (wm8350->pmic.isink_B_dcdc) {
case WM8350_DCDC_2:
case WM8350_DCDC_5:
wm8350_clear_bits(wm8350, WM8350_DCDC_LDO_REQUESTED,
1 << (wm8350->pmic.isink_B_dcdc -
WM8350_DCDC_1));
wm8350_clear_bits(wm8350, WM8350_POWER_MGMT_7,
WM8350_CS2_ENA);
break;
default:
return -EINVAL;
}
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8350_isink_is_enabled(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int isink = rdev_get_id(rdev);
switch (isink) {
case WM8350_ISINK_A:
return wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_A) &
0x8000;
case WM8350_ISINK_B:
return wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_B) &
0x8000;
}
return -EINVAL;
}
int wm8350_isink_set_flash(struct wm8350 *wm8350, int isink, u16 mode,
u16 trigger, u16 duration, u16 on_ramp, u16 off_ramp,
u16 drive)
{
switch (isink) {
case WM8350_ISINK_A:
wm8350_reg_write(wm8350, WM8350_CSA_FLASH_CONTROL,
(mode ? WM8350_CS1_FLASH_MODE : 0) |
(trigger ? WM8350_CS1_TRIGSRC : 0) |
duration | on_ramp | off_ramp | drive);
break;
case WM8350_ISINK_B:
wm8350_reg_write(wm8350, WM8350_CSB_FLASH_CONTROL,
(mode ? WM8350_CS2_FLASH_MODE : 0) |
(trigger ? WM8350_CS2_TRIGSRC : 0) |
duration | on_ramp | off_ramp | drive);
break;
default:
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(wm8350_isink_set_flash);
static int wm8350_dcdc_set_voltage(struct regulator_dev *rdev, int min_uV,
int max_uV)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, dcdc = rdev_get_id(rdev), mV,
min_mV = min_uV / 1000, max_mV = max_uV / 1000;
u16 val;
if (min_mV < 850 || min_mV > 4025)
return -EINVAL;
if (max_mV < 850 || max_mV > 4025)
return -EINVAL;
/* step size is 25mV */
mV = (min_mV - 826) / 25;
if (wm8350_dcdc_val_to_mvolts(mV) > max_mV)
return -EINVAL;
BUG_ON(wm8350_dcdc_val_to_mvolts(mV) < min_mV);
switch (dcdc) {
case WM8350_DCDC_1:
volt_reg = WM8350_DCDC1_CONTROL;
break;
case WM8350_DCDC_3:
volt_reg = WM8350_DCDC3_CONTROL;
break;
case WM8350_DCDC_4:
volt_reg = WM8350_DCDC4_CONTROL;
break;
case WM8350_DCDC_6:
volt_reg = WM8350_DCDC6_CONTROL;
break;
case WM8350_DCDC_2:
case WM8350_DCDC_5:
default:
return -EINVAL;
}
/* all DCDCs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_DC1_VSEL_MASK;
wm8350_reg_write(wm8350, volt_reg, val | mV);
return 0;
}
static int wm8350_dcdc_get_voltage(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, dcdc = rdev_get_id(rdev);
u16 val;
switch (dcdc) {
case WM8350_DCDC_1:
volt_reg = WM8350_DCDC1_CONTROL;
break;
case WM8350_DCDC_3:
volt_reg = WM8350_DCDC3_CONTROL;
break;
case WM8350_DCDC_4:
volt_reg = WM8350_DCDC4_CONTROL;
break;
case WM8350_DCDC_6:
volt_reg = WM8350_DCDC6_CONTROL;
break;
case WM8350_DCDC_2:
case WM8350_DCDC_5:
default:
return -EINVAL;
}
/* all DCDCs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & WM8350_DC1_VSEL_MASK;
return wm8350_dcdc_val_to_mvolts(val) * 1000;
}
static int wm8350_dcdc_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, mV = uV / 1000, dcdc = rdev_get_id(rdev);
u16 val;
dev_dbg(wm8350->dev, "%s %d mV %d\n", __func__, dcdc, mV);
if (mV && (mV < 850 || mV > 4025)) {
dev_err(wm8350->dev,
"DCDC%d suspend voltage %d mV out of range\n",
dcdc, mV);
return -EINVAL;
}
if (mV == 0)
mV = 850;
switch (dcdc) {
case WM8350_DCDC_1:
volt_reg = WM8350_DCDC1_LOW_POWER;
break;
case WM8350_DCDC_3:
volt_reg = WM8350_DCDC3_LOW_POWER;
break;
case WM8350_DCDC_4:
volt_reg = WM8350_DCDC4_LOW_POWER;
break;
case WM8350_DCDC_6:
volt_reg = WM8350_DCDC6_LOW_POWER;
break;
case WM8350_DCDC_2:
case WM8350_DCDC_5:
default:
return -EINVAL;
}
/* all DCDCs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_DC1_VSEL_MASK;
wm8350_reg_write(wm8350, volt_reg,
val | wm8350_dcdc_mvolts_to_val(mV));
return 0;
}
static int wm8350_dcdc_set_suspend_enable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 val;
switch (dcdc) {
case WM8350_DCDC_1:
val = wm8350_reg_read(wm8350, WM8350_DCDC1_LOW_POWER)
& ~WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC1_LOW_POWER,
wm8350->pmic.dcdc1_hib_mode);
break;
case WM8350_DCDC_3:
val = wm8350_reg_read(wm8350, WM8350_DCDC3_LOW_POWER)
& ~WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC3_LOW_POWER,
wm8350->pmic.dcdc3_hib_mode);
break;
case WM8350_DCDC_4:
val = wm8350_reg_read(wm8350, WM8350_DCDC4_LOW_POWER)
& ~WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC4_LOW_POWER,
wm8350->pmic.dcdc4_hib_mode);
break;
case WM8350_DCDC_6:
val = wm8350_reg_read(wm8350, WM8350_DCDC6_LOW_POWER)
& ~WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC6_LOW_POWER,
wm8350->pmic.dcdc6_hib_mode);
break;
case WM8350_DCDC_2:
case WM8350_DCDC_5:
default:
return -EINVAL;
}
return 0;
}
static int wm8350_dcdc_set_suspend_disable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 val;
switch (dcdc) {
case WM8350_DCDC_1:
val = wm8350_reg_read(wm8350, WM8350_DCDC1_LOW_POWER);
wm8350->pmic.dcdc1_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC1_LOW_POWER,
WM8350_DCDC_HIB_MODE_DIS);
break;
case WM8350_DCDC_3:
val = wm8350_reg_read(wm8350, WM8350_DCDC3_LOW_POWER);
wm8350->pmic.dcdc3_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC3_LOW_POWER,
WM8350_DCDC_HIB_MODE_DIS);
break;
case WM8350_DCDC_4:
val = wm8350_reg_read(wm8350, WM8350_DCDC4_LOW_POWER);
wm8350->pmic.dcdc4_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC4_LOW_POWER,
WM8350_DCDC_HIB_MODE_DIS);
break;
case WM8350_DCDC_6:
val = wm8350_reg_read(wm8350, WM8350_DCDC6_LOW_POWER);
wm8350->pmic.dcdc6_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC6_LOW_POWER,
WM8350_DCDC_HIB_MODE_DIS);
break;
case WM8350_DCDC_2:
case WM8350_DCDC_5:
default:
return -EINVAL;
}
return 0;
}
static int wm8350_dcdc25_set_suspend_enable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 val;
switch (dcdc) {
case WM8350_DCDC_2:
val = wm8350_reg_read(wm8350, WM8350_DCDC2_CONTROL)
& ~WM8350_DC2_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC2_CONTROL, val |
WM8350_DC2_HIB_MODE_ACTIVE);
break;
case WM8350_DCDC_5:
val = wm8350_reg_read(wm8350, WM8350_DCDC5_CONTROL)
& ~WM8350_DC2_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC5_CONTROL, val |
WM8350_DC5_HIB_MODE_ACTIVE);
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8350_dcdc25_set_suspend_disable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 val;
switch (dcdc) {
case WM8350_DCDC_2:
val = wm8350_reg_read(wm8350, WM8350_DCDC2_CONTROL)
& ~WM8350_DC2_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC2_CONTROL, val |
WM8350_DC2_HIB_MODE_DISABLE);
break;
case WM8350_DCDC_5:
val = wm8350_reg_read(wm8350, WM8350_DCDC5_CONTROL)
& ~WM8350_DC2_HIB_MODE_MASK;
wm8350_reg_write(wm8350, WM8350_DCDC5_CONTROL, val |
WM8350_DC2_HIB_MODE_DISABLE);
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8350_dcdc_set_suspend_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 *hib_mode;
switch (dcdc) {
case WM8350_DCDC_1:
hib_mode = &wm8350->pmic.dcdc1_hib_mode;
break;
case WM8350_DCDC_3:
hib_mode = &wm8350->pmic.dcdc3_hib_mode;
break;
case WM8350_DCDC_4:
hib_mode = &wm8350->pmic.dcdc4_hib_mode;
break;
case WM8350_DCDC_6:
hib_mode = &wm8350->pmic.dcdc6_hib_mode;
break;
case WM8350_DCDC_2:
case WM8350_DCDC_5:
default:
return -EINVAL;
}
switch (mode) {
case REGULATOR_MODE_NORMAL:
*hib_mode = WM8350_DCDC_HIB_MODE_IMAGE;
break;
case REGULATOR_MODE_IDLE:
*hib_mode = WM8350_DCDC_HIB_MODE_STANDBY;
break;
case REGULATOR_MODE_STANDBY:
*hib_mode = WM8350_DCDC_HIB_MODE_LDO_IM;
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8350_ldo_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, mV = uV / 1000, ldo = rdev_get_id(rdev);
u16 val;
dev_dbg(wm8350->dev, "%s %d mV %d\n", __func__, ldo, mV);
if (mV < 900 || mV > 3300) {
dev_err(wm8350->dev, "LDO%d voltage %d mV out of range\n",
ldo, mV);
return -EINVAL;
}
switch (ldo) {
case WM8350_LDO_1:
volt_reg = WM8350_LDO1_LOW_POWER;
break;
case WM8350_LDO_2:
volt_reg = WM8350_LDO2_LOW_POWER;
break;
case WM8350_LDO_3:
volt_reg = WM8350_LDO3_LOW_POWER;
break;
case WM8350_LDO_4:
volt_reg = WM8350_LDO4_LOW_POWER;
break;
default:
return -EINVAL;
}
/* all LDOs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_LDO1_VSEL_MASK;
wm8350_reg_write(wm8350, volt_reg,
val | wm8350_ldo_mvolts_to_val(mV));
return 0;
}
static int wm8350_ldo_set_suspend_enable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, ldo = rdev_get_id(rdev);
u16 val;
switch (ldo) {
case WM8350_LDO_1:
volt_reg = WM8350_LDO1_LOW_POWER;
break;
case WM8350_LDO_2:
volt_reg = WM8350_LDO2_LOW_POWER;
break;
case WM8350_LDO_3:
volt_reg = WM8350_LDO3_LOW_POWER;
break;
case WM8350_LDO_4:
volt_reg = WM8350_LDO4_LOW_POWER;
break;
default:
return -EINVAL;
}
/* all LDOs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_LDO1_HIB_MODE_MASK;
wm8350_reg_write(wm8350, volt_reg, val);
return 0;
}
static int wm8350_ldo_set_suspend_disable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, ldo = rdev_get_id(rdev);
u16 val;
switch (ldo) {
case WM8350_LDO_1:
volt_reg = WM8350_LDO1_LOW_POWER;
break;
case WM8350_LDO_2:
volt_reg = WM8350_LDO2_LOW_POWER;
break;
case WM8350_LDO_3:
volt_reg = WM8350_LDO3_LOW_POWER;
break;
case WM8350_LDO_4:
volt_reg = WM8350_LDO4_LOW_POWER;
break;
default:
return -EINVAL;
}
/* all LDOs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_LDO1_HIB_MODE_MASK;
wm8350_reg_write(wm8350, volt_reg, WM8350_LDO1_HIB_MODE_DIS);
return 0;
}
static int wm8350_ldo_set_voltage(struct regulator_dev *rdev, int min_uV,
int max_uV)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, ldo = rdev_get_id(rdev), mV, min_mV = min_uV / 1000,
max_mV = max_uV / 1000;
u16 val;
if (min_mV < 900 || min_mV > 3300)
return -EINVAL;
if (max_mV < 900 || max_mV > 3300)
return -EINVAL;
if (min_mV < 1800) {
/* step size is 50mV < 1800mV */
mV = (min_mV - 851) / 50;
if (wm8350_ldo_val_to_mvolts(mV) > max_mV)
return -EINVAL;
BUG_ON(wm8350_ldo_val_to_mvolts(mV) < min_mV);
} else {
/* step size is 100mV > 1800mV */
mV = ((min_mV - 1701) / 100) + 16;
if (wm8350_ldo_val_to_mvolts(mV) > max_mV)
return -EINVAL;
BUG_ON(wm8350_ldo_val_to_mvolts(mV) < min_mV);
}
switch (ldo) {
case WM8350_LDO_1:
volt_reg = WM8350_LDO1_CONTROL;
break;
case WM8350_LDO_2:
volt_reg = WM8350_LDO2_CONTROL;
break;
case WM8350_LDO_3:
volt_reg = WM8350_LDO3_CONTROL;
break;
case WM8350_LDO_4:
volt_reg = WM8350_LDO4_CONTROL;
break;
default:
return -EINVAL;
}
/* all LDOs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_LDO1_VSEL_MASK;
wm8350_reg_write(wm8350, volt_reg, val | mV);
return 0;
}
static int wm8350_ldo_get_voltage(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int volt_reg, ldo = rdev_get_id(rdev);
u16 val;
switch (ldo) {
case WM8350_LDO_1:
volt_reg = WM8350_LDO1_CONTROL;
break;
case WM8350_LDO_2:
volt_reg = WM8350_LDO2_CONTROL;
break;
case WM8350_LDO_3:
volt_reg = WM8350_LDO3_CONTROL;
break;
case WM8350_LDO_4:
volt_reg = WM8350_LDO4_CONTROL;
break;
default:
return -EINVAL;
}
/* all LDOs have same mV bits */
val = wm8350_reg_read(wm8350, volt_reg) & WM8350_LDO1_VSEL_MASK;
return wm8350_ldo_val_to_mvolts(val) * 1000;
}
int wm8350_dcdc_set_slot(struct wm8350 *wm8350, int dcdc, u16 start,
u16 stop, u16 fault)
{
int slot_reg;
u16 val;
dev_dbg(wm8350->dev, "%s %d start %d stop %d\n",
__func__, dcdc, start, stop);
/* slot valid ? */
if (start > 15 || stop > 15)
return -EINVAL;
switch (dcdc) {
case WM8350_DCDC_1:
slot_reg = WM8350_DCDC1_TIMEOUTS;
break;
case WM8350_DCDC_2:
slot_reg = WM8350_DCDC2_TIMEOUTS;
break;
case WM8350_DCDC_3:
slot_reg = WM8350_DCDC3_TIMEOUTS;
break;
case WM8350_DCDC_4:
slot_reg = WM8350_DCDC4_TIMEOUTS;
break;
case WM8350_DCDC_5:
slot_reg = WM8350_DCDC5_TIMEOUTS;
break;
case WM8350_DCDC_6:
slot_reg = WM8350_DCDC6_TIMEOUTS;
break;
default:
return -EINVAL;
}
val = wm8350_reg_read(wm8350, slot_reg) &
~(WM8350_DC1_ENSLOT_MASK | WM8350_DC1_SDSLOT_MASK |
WM8350_DC1_ERRACT_MASK);
wm8350_reg_write(wm8350, slot_reg,
val | (start << WM8350_DC1_ENSLOT_SHIFT) |
(stop << WM8350_DC1_SDSLOT_SHIFT) |
(fault << WM8350_DC1_ERRACT_SHIFT));
return 0;
}
EXPORT_SYMBOL_GPL(wm8350_dcdc_set_slot);
int wm8350_ldo_set_slot(struct wm8350 *wm8350, int ldo, u16 start, u16 stop)
{
int slot_reg;
u16 val;
dev_dbg(wm8350->dev, "%s %d start %d stop %d\n",
__func__, ldo, start, stop);
/* slot valid ? */
if (start > 15 || stop > 15)
return -EINVAL;
switch (ldo) {
case WM8350_LDO_1:
slot_reg = WM8350_LDO1_TIMEOUTS;
break;
case WM8350_LDO_2:
slot_reg = WM8350_LDO2_TIMEOUTS;
break;
case WM8350_LDO_3:
slot_reg = WM8350_LDO3_TIMEOUTS;
break;
case WM8350_LDO_4:
slot_reg = WM8350_LDO4_TIMEOUTS;
break;
default:
return -EINVAL;
}
val = wm8350_reg_read(wm8350, slot_reg) & ~WM8350_LDO1_SDSLOT_MASK;
wm8350_reg_write(wm8350, slot_reg, val | ((start << 10) | (stop << 6)));
return 0;
}
EXPORT_SYMBOL_GPL(wm8350_ldo_set_slot);
int wm8350_dcdc25_set_mode(struct wm8350 *wm8350, int dcdc, u16 mode,
u16 ilim, u16 ramp, u16 feedback)
{
u16 val;
dev_dbg(wm8350->dev, "%s %d mode: %s %s\n", __func__, dcdc,
mode ? "normal" : "boost", ilim ? "low" : "normal");
switch (dcdc) {
case WM8350_DCDC_2:
val = wm8350_reg_read(wm8350, WM8350_DCDC2_CONTROL)
& ~(WM8350_DC2_MODE_MASK | WM8350_DC2_ILIM_MASK |
WM8350_DC2_RMP_MASK | WM8350_DC2_FBSRC_MASK);
wm8350_reg_write(wm8350, WM8350_DCDC2_CONTROL, val |
(mode << WM8350_DC2_MODE_SHIFT) |
(ilim << WM8350_DC2_ILIM_SHIFT) |
(ramp << WM8350_DC2_RMP_SHIFT) |
(feedback << WM8350_DC2_FBSRC_SHIFT));
break;
case WM8350_DCDC_5:
val = wm8350_reg_read(wm8350, WM8350_DCDC5_CONTROL)
& ~(WM8350_DC5_MODE_MASK | WM8350_DC5_ILIM_MASK |
WM8350_DC5_RMP_MASK | WM8350_DC5_FBSRC_MASK);
wm8350_reg_write(wm8350, WM8350_DCDC5_CONTROL, val |
(mode << WM8350_DC5_MODE_SHIFT) |
(ilim << WM8350_DC5_ILIM_SHIFT) |
(ramp << WM8350_DC5_RMP_SHIFT) |
(feedback << WM8350_DC5_FBSRC_SHIFT));
break;
default:
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(wm8350_dcdc25_set_mode);
static int wm8350_dcdc_enable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 shift;
if (dcdc < WM8350_DCDC_1 || dcdc > WM8350_DCDC_6)
return -EINVAL;
shift = dcdc - WM8350_DCDC_1;
wm8350_set_bits(wm8350, WM8350_DCDC_LDO_REQUESTED, 1 << shift);
return 0;
}
static int wm8350_dcdc_disable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 shift;
if (dcdc < WM8350_DCDC_1 || dcdc > WM8350_DCDC_6)
return -EINVAL;
shift = dcdc - WM8350_DCDC_1;
wm8350_clear_bits(wm8350, WM8350_DCDC_LDO_REQUESTED, 1 << shift);
return 0;
}
static int wm8350_ldo_enable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int ldo = rdev_get_id(rdev);
u16 shift;
if (ldo < WM8350_LDO_1 || ldo > WM8350_LDO_4)
return -EINVAL;
shift = (ldo - WM8350_LDO_1) + 8;
wm8350_set_bits(wm8350, WM8350_DCDC_LDO_REQUESTED, 1 << shift);
return 0;
}
static int wm8350_ldo_disable(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int ldo = rdev_get_id(rdev);
u16 shift;
if (ldo < WM8350_LDO_1 || ldo > WM8350_LDO_4)
return -EINVAL;
shift = (ldo - WM8350_LDO_1) + 8;
wm8350_clear_bits(wm8350, WM8350_DCDC_LDO_REQUESTED, 1 << shift);
return 0;
}
static int force_continuous_enable(struct wm8350 *wm8350, int dcdc, int enable)
{
int reg = 0, ret;
switch (dcdc) {
case WM8350_DCDC_1:
reg = WM8350_DCDC1_FORCE_PWM;
break;
case WM8350_DCDC_3:
reg = WM8350_DCDC3_FORCE_PWM;
break;
case WM8350_DCDC_4:
reg = WM8350_DCDC4_FORCE_PWM;
break;
case WM8350_DCDC_6:
reg = WM8350_DCDC6_FORCE_PWM;
break;
default:
return -EINVAL;
}
if (enable)
ret = wm8350_set_bits(wm8350, reg,
WM8350_DCDC1_FORCE_PWM_ENA);
else
ret = wm8350_clear_bits(wm8350, reg,
WM8350_DCDC1_FORCE_PWM_ENA);
return ret;
}
static int wm8350_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 val;
if (dcdc < WM8350_DCDC_1 || dcdc > WM8350_DCDC_6)
return -EINVAL;
if (dcdc == WM8350_DCDC_2 || dcdc == WM8350_DCDC_5)
return -EINVAL;
val = 1 << (dcdc - WM8350_DCDC_1);
switch (mode) {
case REGULATOR_MODE_FAST:
/* force continuous mode */
wm8350_set_bits(wm8350, WM8350_DCDC_ACTIVE_OPTIONS, val);
wm8350_clear_bits(wm8350, WM8350_DCDC_SLEEP_OPTIONS, val);
force_continuous_enable(wm8350, dcdc, 1);
break;
case REGULATOR_MODE_NORMAL:
/* active / pulse skipping */
wm8350_set_bits(wm8350, WM8350_DCDC_ACTIVE_OPTIONS, val);
wm8350_clear_bits(wm8350, WM8350_DCDC_SLEEP_OPTIONS, val);
force_continuous_enable(wm8350, dcdc, 0);
break;
case REGULATOR_MODE_IDLE:
/* standby mode */
force_continuous_enable(wm8350, dcdc, 0);
wm8350_clear_bits(wm8350, WM8350_DCDC_SLEEP_OPTIONS, val);
wm8350_clear_bits(wm8350, WM8350_DCDC_ACTIVE_OPTIONS, val);
break;
case REGULATOR_MODE_STANDBY:
/* LDO mode */
force_continuous_enable(wm8350, dcdc, 0);
wm8350_set_bits(wm8350, WM8350_DCDC_SLEEP_OPTIONS, val);
break;
}
return 0;
}
static unsigned int wm8350_dcdc_get_mode(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev);
u16 mask, sleep, active, force;
int mode = REGULATOR_MODE_NORMAL;
if (dcdc < WM8350_DCDC_1 || dcdc > WM8350_DCDC_6)
return -EINVAL;
if (dcdc == WM8350_DCDC_2 || dcdc == WM8350_DCDC_5)
return -EINVAL;
mask = 1 << (dcdc - WM8350_DCDC_1);
active = wm8350_reg_read(wm8350, WM8350_DCDC_ACTIVE_OPTIONS) & mask;
sleep = wm8350_reg_read(wm8350, WM8350_DCDC_SLEEP_OPTIONS) & mask;
force = wm8350_reg_read(wm8350, WM8350_DCDC1_FORCE_PWM)
& WM8350_DCDC1_FORCE_PWM_ENA;
dev_dbg(wm8350->dev, "mask %x active %x sleep %x force %x",
mask, active, sleep, force);
if (active && !sleep) {
if (force)
mode = REGULATOR_MODE_FAST;
else
mode = REGULATOR_MODE_NORMAL;
} else if (!active && !sleep)
mode = REGULATOR_MODE_IDLE;
else if (!sleep)
mode = REGULATOR_MODE_STANDBY;
return mode;
}
static unsigned int wm8350_ldo_get_mode(struct regulator_dev *rdev)
{
return REGULATOR_MODE_NORMAL;
}
struct wm8350_dcdc_efficiency {
int uA_load_min;
int uA_load_max;
unsigned int mode;
};
static const struct wm8350_dcdc_efficiency dcdc1_6_efficiency[] = {
{0, 10000, REGULATOR_MODE_STANDBY}, /* 0 - 10mA - LDO */
{10000, 100000, REGULATOR_MODE_IDLE}, /* 10mA - 100mA - Standby */
{100000, 1000000, REGULATOR_MODE_NORMAL}, /* > 100mA - Active */
{-1, -1, REGULATOR_MODE_NORMAL},
};
static const struct wm8350_dcdc_efficiency dcdc3_4_efficiency[] = {
{0, 10000, REGULATOR_MODE_STANDBY}, /* 0 - 10mA - LDO */
{10000, 100000, REGULATOR_MODE_IDLE}, /* 10mA - 100mA - Standby */
{100000, 800000, REGULATOR_MODE_NORMAL}, /* > 100mA - Active */
{-1, -1, REGULATOR_MODE_NORMAL},
};
static unsigned int get_mode(int uA, const struct wm8350_dcdc_efficiency *eff)
{
int i = 0;
while (eff[i].uA_load_min != -1) {
if (uA >= eff[i].uA_load_min && uA <= eff[i].uA_load_max)
return eff[i].mode;
}
return REGULATOR_MODE_NORMAL;
}
/* Query the regulator for it's most efficient mode @ uV,uA
* WM8350 regulator efficiency is pretty similar over
* different input and output uV.
*/
static unsigned int wm8350_dcdc_get_optimum_mode(struct regulator_dev *rdev,
int input_uV, int output_uV,
int output_uA)
{
int dcdc = rdev_get_id(rdev), mode;
switch (dcdc) {
case WM8350_DCDC_1:
case WM8350_DCDC_6:
mode = get_mode(output_uA, dcdc1_6_efficiency);
break;
case WM8350_DCDC_3:
case WM8350_DCDC_4:
mode = get_mode(output_uA, dcdc3_4_efficiency);
break;
default:
mode = REGULATOR_MODE_NORMAL;
break;
}
return mode;
}
static int wm8350_dcdc_is_enabled(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int dcdc = rdev_get_id(rdev), shift;
if (dcdc < WM8350_DCDC_1 || dcdc > WM8350_DCDC_6)
return -EINVAL;
shift = dcdc - WM8350_DCDC_1;
return wm8350_reg_read(wm8350, WM8350_DCDC_LDO_REQUESTED)
& (1 << shift);
}
static int wm8350_ldo_is_enabled(struct regulator_dev *rdev)
{
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
int ldo = rdev_get_id(rdev), shift;
if (ldo < WM8350_LDO_1 || ldo > WM8350_LDO_4)
return -EINVAL;
shift = (ldo - WM8350_LDO_1) + 8;
return wm8350_reg_read(wm8350, WM8350_DCDC_LDO_REQUESTED)
& (1 << shift);
}
static struct regulator_ops wm8350_dcdc_ops = {
.set_voltage = wm8350_dcdc_set_voltage,
.get_voltage = wm8350_dcdc_get_voltage,
.enable = wm8350_dcdc_enable,
.disable = wm8350_dcdc_disable,
.get_mode = wm8350_dcdc_get_mode,
.set_mode = wm8350_dcdc_set_mode,
.get_optimum_mode = wm8350_dcdc_get_optimum_mode,
.is_enabled = wm8350_dcdc_is_enabled,
.set_suspend_voltage = wm8350_dcdc_set_suspend_voltage,
.set_suspend_enable = wm8350_dcdc_set_suspend_enable,
.set_suspend_disable = wm8350_dcdc_set_suspend_disable,
.set_suspend_mode = wm8350_dcdc_set_suspend_mode,
};
static struct regulator_ops wm8350_dcdc2_5_ops = {
.enable = wm8350_dcdc_enable,
.disable = wm8350_dcdc_disable,
.is_enabled = wm8350_dcdc_is_enabled,
.set_suspend_enable = wm8350_dcdc25_set_suspend_enable,
.set_suspend_disable = wm8350_dcdc25_set_suspend_disable,
};
static struct regulator_ops wm8350_ldo_ops = {
.set_voltage = wm8350_ldo_set_voltage,
.get_voltage = wm8350_ldo_get_voltage,
.enable = wm8350_ldo_enable,
.disable = wm8350_ldo_disable,
.is_enabled = wm8350_ldo_is_enabled,
.get_mode = wm8350_ldo_get_mode,
.set_suspend_voltage = wm8350_ldo_set_suspend_voltage,
.set_suspend_enable = wm8350_ldo_set_suspend_enable,
.set_suspend_disable = wm8350_ldo_set_suspend_disable,
};
static struct regulator_ops wm8350_isink_ops = {
.set_current_limit = wm8350_isink_set_current,
.get_current_limit = wm8350_isink_get_current,
.enable = wm8350_isink_enable,
.disable = wm8350_isink_disable,
.is_enabled = wm8350_isink_is_enabled,
};
static struct regulator_desc wm8350_reg[NUM_WM8350_REGULATORS] = {
{
.name = "DCDC1",
.id = WM8350_DCDC_1,
.ops = &wm8350_dcdc_ops,
.irq = WM8350_IRQ_UV_DC1,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC2",
.id = WM8350_DCDC_2,
.ops = &wm8350_dcdc2_5_ops,
.irq = WM8350_IRQ_UV_DC2,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC3",
.id = WM8350_DCDC_3,
.ops = &wm8350_dcdc_ops,
.irq = WM8350_IRQ_UV_DC3,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC4",
.id = WM8350_DCDC_4,
.ops = &wm8350_dcdc_ops,
.irq = WM8350_IRQ_UV_DC4,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC5",
.id = WM8350_DCDC_5,
.ops = &wm8350_dcdc2_5_ops,
.irq = WM8350_IRQ_UV_DC5,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC6",
.id = WM8350_DCDC_6,
.ops = &wm8350_dcdc_ops,
.irq = WM8350_IRQ_UV_DC6,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO1",
.id = WM8350_LDO_1,
.ops = &wm8350_ldo_ops,
.irq = WM8350_IRQ_UV_LDO1,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO2",
.id = WM8350_LDO_2,
.ops = &wm8350_ldo_ops,
.irq = WM8350_IRQ_UV_LDO2,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO3",
.id = WM8350_LDO_3,
.ops = &wm8350_ldo_ops,
.irq = WM8350_IRQ_UV_LDO3,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO4",
.id = WM8350_LDO_4,
.ops = &wm8350_ldo_ops,
.irq = WM8350_IRQ_UV_LDO4,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "ISINKA",
.id = WM8350_ISINK_A,
.ops = &wm8350_isink_ops,
.irq = WM8350_IRQ_CS1,
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
},
{
.name = "ISINKB",
.id = WM8350_ISINK_B,
.ops = &wm8350_isink_ops,
.irq = WM8350_IRQ_CS2,
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
},
};
static void pmic_uv_handler(struct wm8350 *wm8350, int irq, void *data)
{
struct regulator_dev *rdev = (struct regulator_dev *)data;
if (irq == WM8350_IRQ_CS1 || irq == WM8350_IRQ_CS2)
regulator_notifier_call_chain(rdev,
REGULATOR_EVENT_REGULATION_OUT,
wm8350);
else
regulator_notifier_call_chain(rdev,
REGULATOR_EVENT_UNDER_VOLTAGE,
wm8350);
}
static int wm8350_regulator_probe(struct platform_device *pdev)
{
struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev);
struct regulator_dev *rdev;
int ret;
u16 val;
if (pdev->id < WM8350_DCDC_1 || pdev->id > WM8350_ISINK_B)
return -ENODEV;
/* do any regulatior specific init */
switch (pdev->id) {
case WM8350_DCDC_1:
val = wm8350_reg_read(wm8350, WM8350_DCDC1_LOW_POWER);
wm8350->pmic.dcdc1_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
break;
case WM8350_DCDC_3:
val = wm8350_reg_read(wm8350, WM8350_DCDC3_LOW_POWER);
wm8350->pmic.dcdc3_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
break;
case WM8350_DCDC_4:
val = wm8350_reg_read(wm8350, WM8350_DCDC4_LOW_POWER);
wm8350->pmic.dcdc4_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
break;
case WM8350_DCDC_6:
val = wm8350_reg_read(wm8350, WM8350_DCDC6_LOW_POWER);
wm8350->pmic.dcdc6_hib_mode = val & WM8350_DCDC_HIB_MODE_MASK;
break;
}
/* register regulator */
rdev = regulator_register(&wm8350_reg[pdev->id], &pdev->dev,
dev_get_drvdata(&pdev->dev));
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register %s\n",
wm8350_reg[pdev->id].name);
return PTR_ERR(rdev);
}
/* register regulator IRQ */
ret = wm8350_register_irq(wm8350, wm8350_reg[pdev->id].irq,
pmic_uv_handler, rdev);
if (ret < 0) {
regulator_unregister(rdev);
dev_err(&pdev->dev, "failed to register regulator %s IRQ\n",
wm8350_reg[pdev->id].name);
return ret;
}
wm8350_unmask_irq(wm8350, wm8350_reg[pdev->id].irq);
return 0;
}
static int wm8350_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
wm8350_mask_irq(wm8350, wm8350_reg[pdev->id].irq);
wm8350_free_irq(wm8350, wm8350_reg[pdev->id].irq);
regulator_unregister(rdev);
return 0;
}
int wm8350_register_regulator(struct wm8350 *wm8350, int reg,
struct regulator_init_data *initdata)
{
struct platform_device *pdev;
int ret;
if (wm8350->pmic.pdev[reg])
return -EBUSY;
mfd: Support configurable numbers of DCDCs and ISINKs on WM8350 Some WM8350 variants have fewer DCDCs and ISINKs. Identify these at probe and refuse to use the absent DCDCs when running on these chips. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
2008-12-19 01:12:16 +03:00
if (reg >= WM8350_DCDC_1 && reg <= WM8350_DCDC_6 &&
reg > wm8350->pmic.max_dcdc)
return -ENODEV;
if (reg >= WM8350_ISINK_A && reg <= WM8350_ISINK_B &&
reg > wm8350->pmic.max_isink)
return -ENODEV;
regulator: Add WM8350 regulator support The WM8350 features six DCDC convertors (four buck and two boost), four LDO voltage regulators and two constant current sinks. This driver adds support for these through the regulator API. This driver was written by Liam Girdwood with updates for submission from Mark Brown. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2008-10-10 18:58:15 +04:00
pdev = platform_device_alloc("wm8350-regulator", reg);
if (!pdev)
return -ENOMEM;
wm8350->pmic.pdev[reg] = pdev;
initdata->driver_data = wm8350;
pdev->dev.platform_data = initdata;
pdev->dev.parent = wm8350->dev;
platform_set_drvdata(pdev, wm8350);
ret = platform_device_add(pdev);
if (ret != 0) {
dev_err(wm8350->dev, "Failed to register regulator %d: %d\n",
reg, ret);
platform_device_del(pdev);
wm8350->pmic.pdev[reg] = NULL;
}
return ret;
}
EXPORT_SYMBOL_GPL(wm8350_register_regulator);
static struct platform_driver wm8350_regulator_driver = {
.probe = wm8350_regulator_probe,
.remove = wm8350_regulator_remove,
.driver = {
.name = "wm8350-regulator",
},
};
static int __init wm8350_regulator_init(void)
{
return platform_driver_register(&wm8350_regulator_driver);
}
subsys_initcall(wm8350_regulator_init);
static void __exit wm8350_regulator_exit(void)
{
platform_driver_unregister(&wm8350_regulator_driver);
}
module_exit(wm8350_regulator_exit);
/* Module information */
MODULE_AUTHOR("Liam Girdwood");
MODULE_DESCRIPTION("WM8350 voltage and current regulator driver");
MODULE_LICENSE("GPL");
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