Commit 9e501086 authored by Mark Brown's avatar Mark Brown Committed by Samuel Ortiz
Browse files

mfd: Add initial WM8994 support



The WM8994 is a highly integrated ultra low power audio hub CODEC.
Since it includes on-board regulators and GPIOs it is represented
as a multi-function device, though the overwhelming majority of
the functionality is provided by the ASoC CODEC driver.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 1c4d3b70
......@@ -295,6 +295,18 @@ config MFD_WM8350_I2C
I2C as the control interface. Additional options must be
selected to enable support for the functionality of the chip.
config MFD_WM8994
tristate "Support Wolfson Microelectronics WM8994"
select MFD_CORE
depends on I2C
help
The WM8994 is a highly integrated hi-fi CODEC designed for
smartphone applicatiosn. As well as audio functionality it
has on board GPIO and regulator functionality which is
supported via the relevant subsystems. This driver provides
core support for the WM8994, in order to use the actual
functionaltiy of the device other drivers must be enabled.
config MFD_PCF50633
tristate "Support for NXP PCF50633"
depends on I2C
......
......@@ -25,6 +25,7 @@ wm8350-objs := wm8350-core.o wm8350-regmap.o wm8350-gpio.o
wm8350-objs += wm8350-irq.o
obj-$(CONFIG_MFD_WM8350) += wm8350.o
obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
obj-$(CONFIG_MFD_WM8994) += wm8994-core.o
obj-$(CONFIG_TPS65010) += tps65010.o
obj-$(CONFIG_MENELAUS) += menelaus.o
......
/*
* wm8994-core.c -- Device access for Wolfson WM8994
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.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/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/pdata.h>
#include <linux/mfd/wm8994/registers.h>
static int wm8994_read(struct wm8994 *wm8994, unsigned short reg,
int bytes, void *dest)
{
int ret, i;
u16 *buf = dest;
BUG_ON(bytes % 2);
BUG_ON(bytes <= 0);
ret = wm8994->read_dev(wm8994, reg, bytes, dest);
if (ret < 0)
return ret;
for (i = 0; i < bytes / 2; i++) {
buf[i] = be16_to_cpu(buf[i]);
dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n",
buf[i], reg + i, reg + i);
}
return 0;
}
/**
* wm8994_reg_read: Read a single WM8994 register.
*
* @wm8994: Device to read from.
* @reg: Register to read.
*/
int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
{
unsigned short val;
int ret;
mutex_lock(&wm8994->io_lock);
ret = wm8994_read(wm8994, reg, 2, &val);
mutex_unlock(&wm8994->io_lock);
if (ret < 0)
return ret;
else
return val;
}
EXPORT_SYMBOL_GPL(wm8994_reg_read);
/**
* wm8994_bulk_read: Read multiple WM8994 registers
*
* @wm8994: Device to read from
* @reg: First register
* @count: Number of registers
* @buf: Buffer to fill.
*/
int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
int count, u16 *buf)
{
int ret;
mutex_lock(&wm8994->io_lock);
ret = wm8994_read(wm8994, reg, count * 2, buf);
mutex_unlock(&wm8994->io_lock);
return ret;
}
EXPORT_SYMBOL_GPL(wm8994_bulk_read);
static int wm8994_write(struct wm8994 *wm8994, unsigned short reg,
int bytes, void *src)
{
u16 *buf = src;
int i;
BUG_ON(bytes % 2);
BUG_ON(bytes <= 0);
for (i = 0; i < bytes / 2; i++) {
dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n",
buf[i], reg + i, reg + i);
buf[i] = cpu_to_be16(buf[i]);
}
return wm8994->write_dev(wm8994, reg, bytes, src);
}
/**
* wm8994_reg_write: Write a single WM8994 register.
*
* @wm8994: Device to write to.
* @reg: Register to write to.
* @val: Value to write.
*/
int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
unsigned short val)
{
int ret;
mutex_lock(&wm8994->io_lock);
ret = wm8994_write(wm8994, reg, 2, &val);
mutex_unlock(&wm8994->io_lock);
return ret;
}
EXPORT_SYMBOL_GPL(wm8994_reg_write);
/**
* wm8994_set_bits: Set the value of a bitfield in a WM8994 register
*
* @wm8994: Device to write to.
* @reg: Register to write to.
* @mask: Mask of bits to set.
* @val: Value to set (unshifted)
*/
int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
unsigned short mask, unsigned short val)
{
int ret;
u16 r;
mutex_lock(&wm8994->io_lock);
ret = wm8994_read(wm8994, reg, 2, &r);
if (ret < 0)
goto out;
r &= ~mask;
r |= val;
ret = wm8994_write(wm8994, reg, 2, &r);
out:
mutex_unlock(&wm8994->io_lock);
return ret;
}
EXPORT_SYMBOL_GPL(wm8994_set_bits);
static struct mfd_cell wm8994_regulator_devs[] = {
{ .name = "wm8994-ldo", .id = 1 },
{ .name = "wm8994-ldo", .id = 2 },
};
static struct mfd_cell wm8994_devs[] = {
{ .name = "wm8994-codec" },
{ .name = "wm8994-gpio" },
};
/*
* Supplies for the main bulk of CODEC; the LDO supplies are ignored
* and should be handled via the standard regulator API supply
* management.
*/
static const char *wm8994_main_supplies[] = {
"DBVDD",
"DCVDD",
"AVDD1",
"AVDD2",
"CPVDD",
"SPKVDD1",
"SPKVDD2",
};
#ifdef CONFIG_PM
static int wm8994_device_suspend(struct device *dev)
{
struct wm8994 *wm8994 = dev_get_drvdata(dev);
int ret;
/* GPIO configuration state is saved here since we may be configuring
* the GPIO alternate functions even if we're not using the gpiolib
* driver for them.
*/
ret = wm8994_read(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2,
&wm8994->gpio_regs);
if (ret < 0)
dev_err(dev, "Failed to save GPIO registers: %d\n", ret);
/* For similar reasons we also stash the regulator states */
ret = wm8994_read(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
&wm8994->ldo_regs);
if (ret < 0)
dev_err(dev, "Failed to save LDO registers: %d\n", ret);
ret = regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
if (ret != 0) {
dev_err(dev, "Failed to disable supplies: %d\n", ret);
return ret;
}
return 0;
}
static int wm8994_device_resume(struct device *dev)
{
struct wm8994 *wm8994 = dev_get_drvdata(dev);
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
if (ret != 0) {
dev_err(dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
&wm8994->ldo_regs);
if (ret < 0)
dev_err(dev, "Failed to restore LDO registers: %d\n", ret);
ret = wm8994_write(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2,
&wm8994->gpio_regs);
if (ret < 0)
dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
return 0;
}
#endif
#ifdef CONFIG_REGULATOR
static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
{
struct wm8994_ldo_pdata *ldo_pdata;
if (!pdata)
return 0;
ldo_pdata = &pdata->ldo[ldo];
if (!ldo_pdata->init_data)
return 0;
return ldo_pdata->init_data->num_consumer_supplies != 0;
}
#else
static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
{
return 0;
}
#endif
/*
* Instantiate the generic non-control parts of the device.
*/
static int wm8994_device_init(struct wm8994 *wm8994, unsigned long id, int irq)
{
struct wm8994_pdata *pdata = wm8994->dev->platform_data;
int ret, i;
mutex_init(&wm8994->io_lock);
dev_set_drvdata(wm8994->dev, wm8994);
/* Add the on-chip regulators first for bootstrapping */
ret = mfd_add_devices(wm8994->dev, -1,
wm8994_regulator_devs,
ARRAY_SIZE(wm8994_regulator_devs),
NULL, 0);
if (ret != 0) {
dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
goto err;
}
wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) *
ARRAY_SIZE(wm8994_main_supplies),
GFP_KERNEL);
if (!wm8994->supplies)
goto err;
for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
wm8994->supplies[i].supply = wm8994_main_supplies[i];
ret = regulator_bulk_get(wm8994->dev, ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
if (ret != 0) {
dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
goto err_get;
}
ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
if (ret != 0) {
dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
goto err_supplies;
}
ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
if (ret < 0) {
dev_err(wm8994->dev, "Failed to read ID register\n");
goto err_enable;
}
if (ret != 0x8994) {
dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
ret);
ret = -EINVAL;
goto err_enable;
}
ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
if (ret < 0) {
dev_err(wm8994->dev, "Failed to read revision register: %d\n",
ret);
goto err_enable;
}
switch (ret) {
case 0:
case 1:
dev_warn(wm8994->dev, "revision %c not fully supported\n",
'A' + ret);
break;
default:
dev_info(wm8994->dev, "revision %c\n", 'A' + ret);
break;
}
if (pdata) {
wm8994->gpio_base = pdata->gpio_base;
/* GPIO configuration is only applied if it's non-zero */
for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
if (pdata->gpio_defaults[i]) {
wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
0xffff,
pdata->gpio_defaults[i]);
}
}
}
/* In some system designs where the regulators are not in use,
* we can achieve a small reduction in leakage currents by
* floating LDO outputs. This bit makes no difference if the
* LDOs are enabled, it only affects cases where the LDOs were
* in operation and are then disabled.
*/
for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
if (wm8994_ldo_in_use(pdata, i))
wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
else
wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
WM8994_LDO1_DISCH, 0);
}
ret = mfd_add_devices(wm8994->dev, -1,
wm8994_devs, ARRAY_SIZE(wm8994_devs),
NULL, 0);
if (ret != 0) {
dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
goto err_enable;
}
return 0;
err_enable:
regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
err_get:
regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
err_supplies:
kfree(wm8994->supplies);
err:
mfd_remove_devices(wm8994->dev);
kfree(wm8994);
return ret;
}
static void wm8994_device_exit(struct wm8994 *wm8994)
{
mfd_remove_devices(wm8994->dev);
regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
kfree(wm8994->supplies);
kfree(wm8994);
}
static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg,
int bytes, void *dest)
{
struct i2c_client *i2c = wm8994->control_data;
int ret;
u16 r = cpu_to_be16(reg);
ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
if (ret < 0)
return ret;
if (ret != 2)
return -EIO;
ret = i2c_master_recv(i2c, dest, bytes);
if (ret < 0)
return ret;
if (ret != bytes)
return -EIO;
return 0;
}
/* Currently we allocate the write buffer on the stack; this is OK for
* small writes - if we need to do large writes this will need to be
* revised.
*/
static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg,
int bytes, void *src)
{
struct i2c_client *i2c = wm8994->control_data;
unsigned char msg[bytes + 2];
int ret;
reg = cpu_to_be16(reg);
memcpy(&msg[0], &reg, 2);
memcpy(&msg[2], src, bytes);
ret = i2c_master_send(i2c, msg, bytes + 2);
if (ret < 0)
return ret;
if (ret < bytes + 2)
return -EIO;
return 0;
}
static int wm8994_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8994 *wm8994;
wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL);
if (wm8994 == NULL) {
kfree(i2c);
return -ENOMEM;
}
i2c_set_clientdata(i2c, wm8994);
wm8994->dev = &i2c->dev;
wm8994->control_data = i2c;
wm8994->read_dev = wm8994_i2c_read_device;
wm8994->write_dev = wm8994_i2c_write_device;
return wm8994_device_init(wm8994, id->driver_data, i2c->irq);
}
static int wm8994_i2c_remove(struct i2c_client *i2c)
{
struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
wm8994_device_exit(wm8994);
return 0;
}
#ifdef CONFIG_PM
static int wm8994_i2c_suspend(struct i2c_client *i2c, pm_message_t state)
{
return wm8994_device_suspend(&i2c->dev);
}
static int wm8994_i2c_resume(struct i2c_client *i2c)
{
return wm8994_device_resume(&i2c->dev);
}
#else
#define wm8994_i2c_suspend NULL
#define wm8994_i2c_resume NULL
#endif
static const struct i2c_device_id wm8994_i2c_id[] = {
{ "wm8994", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
static struct i2c_driver wm8994_i2c_driver = {
.driver = {
.name = "wm8994",
.owner = THIS_MODULE,
},
.probe = wm8994_i2c_probe,
.remove = wm8994_i2c_remove,
.suspend = wm8994_i2c_suspend,
.resume = wm8994_i2c_resume,
.id_table = wm8994_i2c_id,
};
static int __init wm8994_i2c_init(void)
{
int ret;
ret = i2c_add_driver(&wm8994_i2c_driver);
if (ret != 0)
pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
return ret;
}
module_init(wm8994_i2c_init);
static void __exit wm8994_i2c_exit(void)
{
i2c_del_driver(&wm8994_i2c_driver);
}
module_exit(wm8994_i2c_exit);
MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
/*
* include/linux/mfd/wm8994/core.h -- Core interface for WM8994
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.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.
*
*/
#ifndef __MFD_WM8994_CORE_H__
#define __MFD_WM8994_CORE_H__
struct regulator_dev;
struct regulator_bulk_data;
#define WM8994_NUM_GPIO_REGS 11
#define WM8994_NUM_LDO_REGS 2
struct wm8994 {
struct mutex io_lock;
struct device *dev;
int (*read_dev)(struct wm8994 *wm8994, unsigned short reg,
int bytes, void *dest);
int (*write_dev)(struct wm8994 *wm8994, unsigned short reg,
int bytes, void *src);
void *control_data;
int gpio_base;
/* Used over suspend/resume */
u16 ldo_regs[WM8994_NUM_LDO_REGS];
u16 gpio_regs[WM8994_NUM_GPIO_REGS];
struct regulator_dev *dbvdd;
struct regulator_bulk_data *supplies;
};
/* Device I/O API */
int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg);
int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
unsigned short val);
int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
unsigned short mask, unsigned short val);
int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
int count, u16 *buf);
#endif