linux/drivers/mfd/adp5520.c

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/*
* Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
* LCD Backlight: drivers/video/backlight/adp5520_bl
* LEDs : drivers/led/leds-adp5520
* GPIO : drivers/gpio/adp5520-gpio (ADP5520 only)
* Keys : drivers/input/keyboard/adp5520-keys (ADP5520 only)
*
* Copyright 2009 Analog Devices Inc.
*
* Derived from da903x:
* Copyright (C) 2008 Compulab, Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* Copyright (C) 2006-2008 Marvell International Ltd.
* Eric Miao <eric.miao@marvell.com>
*
* Licensed under the GPL-2 or later.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.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 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mfd/adp5520.h>
struct adp5520_chip {
struct i2c_client *client;
struct device *dev;
struct mutex lock;
struct blocking_notifier_head notifier_list;
int irq;
unsigned long id;
uint8_t mode;
};
static int __adp5520_read(struct i2c_client *client,
int reg, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
return ret;
}
*val = (uint8_t)ret;
return 0;
}
static int __adp5520_write(struct i2c_client *client,
int reg, uint8_t val)
{
int ret;
ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0) {
dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
val, reg);
return ret;
}
return 0;
}
static int __adp5520_ack_bits(struct i2c_client *client, int reg,
uint8_t bit_mask)
{
struct adp5520_chip *chip = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&chip->lock);
ret = __adp5520_read(client, reg, &reg_val);
if (!ret) {
reg_val |= bit_mask;
ret = __adp5520_write(client, reg, reg_val);
}
mutex_unlock(&chip->lock);
return ret;
}
int adp5520_write(struct device *dev, int reg, uint8_t val)
{
return __adp5520_write(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(adp5520_write);
int adp5520_read(struct device *dev, int reg, uint8_t *val)
{
return __adp5520_read(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(adp5520_read);
int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct adp5520_chip *chip = dev_get_drvdata(dev);
uint8_t reg_val;
int ret;
mutex_lock(&chip->lock);
ret = __adp5520_read(chip->client, reg, &reg_val);
if (!ret && ((reg_val & bit_mask) != bit_mask)) {
reg_val |= bit_mask;
ret = __adp5520_write(chip->client, reg, reg_val);
}
mutex_unlock(&chip->lock);
return ret;
}
EXPORT_SYMBOL_GPL(adp5520_set_bits);
int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct adp5520_chip *chip = dev_get_drvdata(dev);
uint8_t reg_val;
int ret;
mutex_lock(&chip->lock);
ret = __adp5520_read(chip->client, reg, &reg_val);
if (!ret && (reg_val & bit_mask)) {
reg_val &= ~bit_mask;
ret = __adp5520_write(chip->client, reg, reg_val);
}
mutex_unlock(&chip->lock);
return ret;
}
EXPORT_SYMBOL_GPL(adp5520_clr_bits);
int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
unsigned int events)
{
struct adp5520_chip *chip = dev_get_drvdata(dev);
if (chip->irq) {
adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
return blocking_notifier_chain_register(&chip->notifier_list,
nb);
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(adp5520_register_notifier);
int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
unsigned int events)
{
struct adp5520_chip *chip = dev_get_drvdata(dev);
adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
}
EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
static irqreturn_t adp5520_irq_thread(int irq, void *data)
{
struct adp5520_chip *chip = data;
unsigned int events;
uint8_t reg_val;
int ret;
ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, &reg_val);
if (ret)
goto out;
events = reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);
blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
/* ACK, Sticky bits are W1C */
__adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
out:
return IRQ_HANDLED;
}
static int __remove_subdev(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static int adp5520_remove_subdevs(struct adp5520_chip *chip)
{
return device_for_each_child(chip->dev, NULL, __remove_subdev);
}
static int adp5520_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev);
struct platform_device *pdev;
struct adp5520_chip *chip;
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Word Data not Supported\n");
return -EIO;
}
if (pdata == NULL) {
dev_err(&client->dev, "missing platform data\n");
return -ENODEV;
}
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
i2c_set_clientdata(client, chip);
chip->client = client;
chip->dev = &client->dev;
chip->irq = client->irq;
chip->id = id->driver_data;
mutex_init(&chip->lock);
if (chip->irq) {
BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"adp5520", chip);
if (ret) {
dev_err(&client->dev, "failed to request irq %d\n",
chip->irq);
return ret;
}
}
ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
if (ret) {
dev_err(&client->dev, "failed to write\n");
goto out_free_irq;
}
if (pdata->keys) {
pdev = platform_device_register_data(chip->dev, "adp5520-keys",
chip->id, pdata->keys, sizeof(*pdata->keys));
if (IS_ERR(pdev)) {
ret = PTR_ERR(pdev);
goto out_remove_subdevs;
}
}
if (pdata->gpio) {
pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
chip->id, pdata->gpio, sizeof(*pdata->gpio));
if (IS_ERR(pdev)) {
ret = PTR_ERR(pdev);
goto out_remove_subdevs;
}
}
if (pdata->leds) {
pdev = platform_device_register_data(chip->dev, "adp5520-led",
chip->id, pdata->leds, sizeof(*pdata->leds));
if (IS_ERR(pdev)) {
ret = PTR_ERR(pdev);
goto out_remove_subdevs;
}
}
if (pdata->backlight) {
pdev = platform_device_register_data(chip->dev,
"adp5520-backlight",
chip->id,
pdata->backlight,
sizeof(*pdata->backlight));
if (IS_ERR(pdev)) {
ret = PTR_ERR(pdev);
goto out_remove_subdevs;
}
}
return 0;
out_remove_subdevs:
adp5520_remove_subdevs(chip);
out_free_irq:
if (chip->irq)
free_irq(chip->irq, chip);
return ret;
}
static int adp5520_remove(struct i2c_client *client)
{
struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
if (chip->irq)
free_irq(chip->irq, chip);
adp5520_remove_subdevs(chip);
adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int adp5520_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
/* All other bits are W1C */
chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
return 0;
}
static int adp5520_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);
static const struct i2c_device_id adp5520_id[] = {
{ "pmic-adp5520", ID_ADP5520 },
{ "pmic-adp5501", ID_ADP5501 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adp5520_id);
static struct i2c_driver adp5520_driver = {
.driver = {
.name = "adp5520",
.pm = &adp5520_pm,
},
.probe = adp5520_probe,
.remove = adp5520_remove,
.id_table = adp5520_id,
};
module_i2c_driver(adp5520_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
MODULE_LICENSE("GPL");