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linux-next/drivers/mfd/max8998.c
Paul Gortmaker b9e38338e4 mfd: max8998: Make it explicitly non-modular 
The Kconfig currently controlling compilation of this code is:

mfd/Kconfig:config MFD_MAX8998
mfd/Kconfig:    bool "Maxim Semiconductor MAX8998/National LP3974 PMIC Support"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

We explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.

Since module_init was not in use by this code, the init ordering
remains unchanged with this commit.

We delete the include of module.h as well as an unused include of
moduleparam.h too.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2016-06-29 10:14:29 +01:00

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/*
* max8998.c - mfd core driver for the Maxim 8998
*
* Copyright (C) 2009-2010 Samsung Electronics
* Kyungmin Park <kyungmin.park@samsung.com>
* Marek Szyprowski <m.szyprowski@samsung.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
#define RTC_I2C_ADDR (0x0c >> 1)
static const struct mfd_cell max8998_devs[] = {
{
.name = "max8998-pmic",
}, {
.name = "max8998-rtc",
}, {
.name = "max8998-battery",
},
};
static const struct mfd_cell lp3974_devs[] = {
{
.name = "lp3974-pmic",
}, {
.name = "lp3974-rtc",
},
};
int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_byte_data(i2c, reg);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
ret &= 0xff;
*dest = ret;
return 0;
}
EXPORT_SYMBOL(max8998_read_reg);
int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(max8998_bulk_read);
int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_write_byte_data(i2c, reg, value);
mutex_unlock(&max8998->iolock);
return ret;
}
EXPORT_SYMBOL(max8998_write_reg);
int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(max8998_bulk_write);
int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_byte_data(i2c, reg);
if (ret >= 0) {
u8 old_val = ret & 0xff;
u8 new_val = (val & mask) | (old_val & (~mask));
ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
}
mutex_unlock(&max8998->iolock);
return ret;
}
EXPORT_SYMBOL(max8998_update_reg);
#ifdef CONFIG_OF
static const struct of_device_id max8998_dt_match[] = {
{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
{},
};
#endif
/*
* Only the common platform data elements for max8998 are parsed here from the
* device tree. Other sub-modules of max8998 such as pmic, rtc and others have
* to parse their own platform data elements from device tree.
*
* The max8998 platform data structure is instantiated here and the drivers for
* the sub-modules need not instantiate another instance while parsing their
* platform data.
*/
static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
struct device *dev)
{
struct max8998_platform_data *pd;
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return ERR_PTR(-ENOMEM);
pd->ono = irq_of_parse_and_map(dev->of_node, 1);
/*
* ToDo: the 'wakeup' member in the platform data is more of a linux
* specfic information. Hence, there is no binding for that yet and
* not parsed here.
*/
return pd;
}
static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(max8998_dt_match, i2c->dev.of_node);
return (unsigned long)match->data;
}
return id->driver_data;
}
static int max8998_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
struct max8998_dev *max8998;
int ret = 0;
max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
GFP_KERNEL);
if (max8998 == NULL)
return -ENOMEM;
if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
if (IS_ERR(pdata)) {
ret = PTR_ERR(pdata);
goto err;
}
}
i2c_set_clientdata(i2c, max8998);
max8998->dev = &i2c->dev;
max8998->i2c = i2c;
max8998->irq = i2c->irq;
max8998->type = max8998_i2c_get_driver_data(i2c, id);
max8998->pdata = pdata;
if (pdata) {
max8998->ono = pdata->ono;
max8998->irq_base = pdata->irq_base;
max8998->wakeup = pdata->wakeup;
}
mutex_init(&max8998->iolock);
max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
if (!max8998->rtc) {
dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
return -ENODEV;
}
i2c_set_clientdata(max8998->rtc, max8998);
max8998_irq_init(max8998);
pm_runtime_set_active(max8998->dev);
switch (max8998->type) {
case TYPE_LP3974:
ret = mfd_add_devices(max8998->dev, -1,
lp3974_devs, ARRAY_SIZE(lp3974_devs),
NULL, 0, NULL);
break;
case TYPE_MAX8998:
ret = mfd_add_devices(max8998->dev, -1,
max8998_devs, ARRAY_SIZE(max8998_devs),
NULL, 0, NULL);
break;
default:
ret = -EINVAL;
}
if (ret < 0)
goto err;
device_init_wakeup(max8998->dev, max8998->wakeup);
return ret;
err:
mfd_remove_devices(max8998->dev);
max8998_irq_exit(max8998);
i2c_unregister_device(max8998->rtc);
return ret;
}
static const struct i2c_device_id max8998_i2c_id[] = {
{ "max8998", TYPE_MAX8998 },
{ "lp3974", TYPE_LP3974},
{ }
};
static int max8998_suspend(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
if (device_may_wakeup(dev))
irq_set_irq_wake(max8998->irq, 1);
return 0;
}
static int max8998_resume(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
if (device_may_wakeup(dev))
irq_set_irq_wake(max8998->irq, 0);
/*
* In LP3974, if IRQ registers are not "read & clear"
* when it's set during sleep, the interrupt becomes
* disabled.
*/
return max8998_irq_resume(i2c_get_clientdata(i2c));
}
struct max8998_reg_dump {
u8 addr;
u8 val;
};
#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
static struct max8998_reg_dump max8998_dump[] = {
SAVE_ITEM(MAX8998_REG_IRQM1),
SAVE_ITEM(MAX8998_REG_IRQM2),
SAVE_ITEM(MAX8998_REG_IRQM3),
SAVE_ITEM(MAX8998_REG_IRQM4),
SAVE_ITEM(MAX8998_REG_STATUSM1),
SAVE_ITEM(MAX8998_REG_STATUSM2),
SAVE_ITEM(MAX8998_REG_CHGR1),
SAVE_ITEM(MAX8998_REG_CHGR2),
SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
SAVE_ITEM(MAX8998_REG_ONOFF1),
SAVE_ITEM(MAX8998_REG_ONOFF2),
SAVE_ITEM(MAX8998_REG_ONOFF3),
SAVE_ITEM(MAX8998_REG_ONOFF4),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
SAVE_ITEM(MAX8998_REG_LDO4),
SAVE_ITEM(MAX8998_REG_LDO5),
SAVE_ITEM(MAX8998_REG_LDO6),
SAVE_ITEM(MAX8998_REG_LDO7),
SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
SAVE_ITEM(MAX8998_REG_LDO12),
SAVE_ITEM(MAX8998_REG_LDO13),
SAVE_ITEM(MAX8998_REG_LDO14),
SAVE_ITEM(MAX8998_REG_LDO15),
SAVE_ITEM(MAX8998_REG_LDO16),
SAVE_ITEM(MAX8998_REG_LDO17),
SAVE_ITEM(MAX8998_REG_BKCHR),
SAVE_ITEM(MAX8998_REG_LBCNFG1),
SAVE_ITEM(MAX8998_REG_LBCNFG2),
};
/* Save registers before hibernation */
static int max8998_freeze(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
int i;
for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
max8998_read_reg(i2c, max8998_dump[i].addr,
&max8998_dump[i].val);
return 0;
}
/* Restore registers after hibernation */
static int max8998_restore(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
int i;
for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
max8998_write_reg(i2c, max8998_dump[i].addr,
max8998_dump[i].val);
return 0;
}
static const struct dev_pm_ops max8998_pm = {
.suspend = max8998_suspend,
.resume = max8998_resume,
.freeze = max8998_freeze,
.restore = max8998_restore,
};
static struct i2c_driver max8998_i2c_driver = {
.driver = {
.name = "max8998",
.pm = &max8998_pm,
.suppress_bind_attrs = true,
.of_match_table = of_match_ptr(max8998_dt_match),
},
.probe = max8998_i2c_probe,
.id_table = max8998_i2c_id,
};
static int __init max8998_i2c_init(void)
{
return i2c_add_driver(&max8998_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max8998_i2c_init);
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