WSL2-Linux-Kernel/drivers/mfd/wm8994-core.c

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C
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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
#include <linux/slab.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 resource wm8994_codec_resources[] = {
{
.start = WM8994_IRQ_TEMP_SHUT,
.end = WM8994_IRQ_TEMP_WARN,
.flags = IORESOURCE_IRQ,
},
};
static struct resource wm8994_gpio_resources[] = {
{
.start = WM8994_IRQ_GPIO(1),
.end = WM8994_IRQ_GPIO(11),
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell wm8994_devs[] = {
{
.name = "wm8994-codec",
.num_resources = ARRAY_SIZE(wm8994_codec_resources),
.resources = wm8994_codec_resources,
},
{
.name = "wm8994-gpio",
.num_resources = ARRAY_SIZE(wm8994_gpio_resources),
.resources = wm8994_gpio_resources,
},
};
/*
* 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_INTERRUPT_STATUS_1_MASK,
WM8994_NUM_IRQ_REGS * 2, &wm8994->irq_masks_cur);
if (ret < 0)
dev_err(dev, "Failed to restore interrupt masks: %d\n", 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_supplies;
}
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_get;
}
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->irq_base = pdata->irq_base;
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);
}
wm8994_irq_init(wm8994);
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_irq;
}
return 0;
err_irq:
wm8994_irq_exit(wm8994);
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);
wm8994_irq_exit(wm8994);
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;
wm8994->irq = i2c->irq;
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>");