AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/mfd/da903x.c
Axel Lin af65e6cef4 mfd: Set da903x bits if new value is different from the old one 
It does not make sense to write new value only when all the bit_mask
bits are zero.
We need to write new value if the bit mask fields of new value is
not equal to old value.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2011-12-20 18:50:56 +01:00

583 lines
13 KiB
C
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/*
* Base driver for Dialog Semiconductor DA9030/DA9034
*
* Copyright (C) 2008 Compulab, Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* Copyright (C) 2006-2008 Marvell International Ltd.
* Eric Miao <eric.miao@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/mfd/da903x.h>
#include <linux/slab.h>
#define DA9030_CHIP_ID 0x00
#define DA9030_EVENT_A 0x01
#define DA9030_EVENT_B 0x02
#define DA9030_EVENT_C 0x03
#define DA9030_STATUS 0x04
#define DA9030_IRQ_MASK_A 0x05
#define DA9030_IRQ_MASK_B 0x06
#define DA9030_IRQ_MASK_C 0x07
#define DA9030_SYS_CTRL_A 0x08
#define DA9030_SYS_CTRL_B 0x09
#define DA9030_FAULT_LOG 0x0a
#define DA9034_CHIP_ID 0x00
#define DA9034_EVENT_A 0x01
#define DA9034_EVENT_B 0x02
#define DA9034_EVENT_C 0x03
#define DA9034_EVENT_D 0x04
#define DA9034_STATUS_A 0x05
#define DA9034_STATUS_B 0x06
#define DA9034_IRQ_MASK_A 0x07
#define DA9034_IRQ_MASK_B 0x08
#define DA9034_IRQ_MASK_C 0x09
#define DA9034_IRQ_MASK_D 0x0a
#define DA9034_SYS_CTRL_A 0x0b
#define DA9034_SYS_CTRL_B 0x0c
#define DA9034_FAULT_LOG 0x0d
struct da903x_chip;
struct da903x_chip_ops {
int (*init_chip)(struct da903x_chip *);
int (*unmask_events)(struct da903x_chip *, unsigned int events);
int (*mask_events)(struct da903x_chip *, unsigned int events);
int (*read_events)(struct da903x_chip *, unsigned int *events);
int (*read_status)(struct da903x_chip *, unsigned int *status);
};
struct da903x_chip {
struct i2c_client *client;
struct device *dev;
struct da903x_chip_ops *ops;
int type;
uint32_t events_mask;
struct mutex lock;
struct work_struct irq_work;
struct blocking_notifier_head notifier_list;
};
static inline int __da903x_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 inline int __da903x_reads(struct i2c_client *client, int reg,
int len, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
if (ret < 0) {
dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
return ret;
}
return 0;
}
static inline int __da903x_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 inline int __da903x_writes(struct i2c_client *client, int reg,
int len, uint8_t *val)
{
int ret;
ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
if (ret < 0) {
dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
return ret;
}
return 0;
}
int da903x_register_notifier(struct device *dev, struct notifier_block *nb,
unsigned int events)
{
struct da903x_chip *chip = dev_get_drvdata(dev);
chip->ops->unmask_events(chip, events);
return blocking_notifier_chain_register(&chip->notifier_list, nb);
}
EXPORT_SYMBOL_GPL(da903x_register_notifier);
int da903x_unregister_notifier(struct device *dev, struct notifier_block *nb,
unsigned int events)
{
struct da903x_chip *chip = dev_get_drvdata(dev);
chip->ops->mask_events(chip, events);
return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
}
EXPORT_SYMBOL_GPL(da903x_unregister_notifier);
int da903x_write(struct device *dev, int reg, uint8_t val)
{
return __da903x_write(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(da903x_write);
int da903x_writes(struct device *dev, int reg, int len, uint8_t *val)
{
return __da903x_writes(to_i2c_client(dev), reg, len, val);
}
EXPORT_SYMBOL_GPL(da903x_writes);
int da903x_read(struct device *dev, int reg, uint8_t *val)
{
return __da903x_read(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(da903x_read);
int da903x_reads(struct device *dev, int reg, int len, uint8_t *val)
{
return __da903x_reads(to_i2c_client(dev), reg, len, val);
}
EXPORT_SYMBOL_GPL(da903x_reads);
int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct da903x_chip *chip = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&chip->lock);
ret = __da903x_read(chip->client, reg, &reg_val);
if (ret)
goto out;
if ((reg_val & bit_mask) != bit_mask) {
reg_val |= bit_mask;
ret = __da903x_write(chip->client, reg, reg_val);
}
out:
mutex_unlock(&chip->lock);
return ret;
}
EXPORT_SYMBOL_GPL(da903x_set_bits);
int da903x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct da903x_chip *chip = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&chip->lock);
ret = __da903x_read(chip->client, reg, &reg_val);
if (ret)
goto out;
if (reg_val & bit_mask) {
reg_val &= ~bit_mask;
ret = __da903x_write(chip->client, reg, reg_val);
}
out:
mutex_unlock(&chip->lock);
return ret;
}
EXPORT_SYMBOL_GPL(da903x_clr_bits);
int da903x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
{
struct da903x_chip *chip = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&chip->lock);
ret = __da903x_read(chip->client, reg, &reg_val);
if (ret)
goto out;
if ((reg_val & mask) != val) {
reg_val = (reg_val & ~mask) | val;
ret = __da903x_write(chip->client, reg, reg_val);
}
out:
mutex_unlock(&chip->lock);
return ret;
}
EXPORT_SYMBOL_GPL(da903x_update);
int da903x_query_status(struct device *dev, unsigned int sbits)
{
struct da903x_chip *chip = dev_get_drvdata(dev);
unsigned int status = 0;
chip->ops->read_status(chip, &status);
return ((status & sbits) == sbits);
}
EXPORT_SYMBOL(da903x_query_status);
static int __devinit da9030_init_chip(struct da903x_chip *chip)
{
uint8_t chip_id;
int err;
err = __da903x_read(chip->client, DA9030_CHIP_ID, &chip_id);
if (err)
return err;
err = __da903x_write(chip->client, DA9030_SYS_CTRL_A, 0xE8);
if (err)
return err;
dev_info(chip->dev, "DA9030 (CHIP ID: 0x%02x) detected\n", chip_id);
return 0;
}
static int da9030_unmask_events(struct da903x_chip *chip, unsigned int events)
{
uint8_t v[3];
chip->events_mask &= ~events;
v[0] = (chip->events_mask & 0xff);
v[1] = (chip->events_mask >> 8) & 0xff;
v[2] = (chip->events_mask >> 16) & 0xff;
return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
}
static int da9030_mask_events(struct da903x_chip *chip, unsigned int events)
{
uint8_t v[3];
chip->events_mask |= events;
v[0] = (chip->events_mask & 0xff);
v[1] = (chip->events_mask >> 8) & 0xff;
v[2] = (chip->events_mask >> 16) & 0xff;
return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
}
static int da9030_read_events(struct da903x_chip *chip, unsigned int *events)
{
uint8_t v[3] = {0, 0, 0};
int ret;
ret = __da903x_reads(chip->client, DA9030_EVENT_A, 3, v);
if (ret < 0)
return ret;
*events = (v[2] << 16) | (v[1] << 8) | v[0];
return 0;
}
static int da9030_read_status(struct da903x_chip *chip, unsigned int *status)
{
return __da903x_read(chip->client, DA9030_STATUS, (uint8_t *)status);
}
static int da9034_init_chip(struct da903x_chip *chip)
{
uint8_t chip_id;
int err;
err = __da903x_read(chip->client, DA9034_CHIP_ID, &chip_id);
if (err)
return err;
err = __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0xE8);
if (err)
return err;
/* avoid SRAM power off during sleep*/
__da903x_write(chip->client, 0x10, 0x07);
__da903x_write(chip->client, 0x11, 0xff);
__da903x_write(chip->client, 0x12, 0xff);
/* Enable the ONKEY power down functionality */
__da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
__da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
/* workaround to make LEDs work */
__da903x_write(chip->client, 0x90, 0x01);
__da903x_write(chip->client, 0xB0, 0x08);
/* make ADTV1 and SDTV1 effective */
__da903x_write(chip->client, 0x20, 0x00);
dev_info(chip->dev, "DA9034 (CHIP ID: 0x%02x) detected\n", chip_id);
return 0;
}
static int da9034_unmask_events(struct da903x_chip *chip, unsigned int events)
{
uint8_t v[4];
chip->events_mask &= ~events;
v[0] = (chip->events_mask & 0xff);
v[1] = (chip->events_mask >> 8) & 0xff;
v[2] = (chip->events_mask >> 16) & 0xff;
v[3] = (chip->events_mask >> 24) & 0xff;
return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
}
static int da9034_mask_events(struct da903x_chip *chip, unsigned int events)
{
uint8_t v[4];
chip->events_mask |= events;
v[0] = (chip->events_mask & 0xff);
v[1] = (chip->events_mask >> 8) & 0xff;
v[2] = (chip->events_mask >> 16) & 0xff;
v[3] = (chip->events_mask >> 24) & 0xff;
return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
}
static int da9034_read_events(struct da903x_chip *chip, unsigned int *events)
{
uint8_t v[4] = {0, 0, 0, 0};
int ret;
ret = __da903x_reads(chip->client, DA9034_EVENT_A, 4, v);
if (ret < 0)
return ret;
*events = (v[3] << 24) | (v[2] << 16) | (v[1] << 8) | v[0];
return 0;
}
static int da9034_read_status(struct da903x_chip *chip, unsigned int *status)
{
uint8_t v[2] = {0, 0};
int ret = 0;
ret = __da903x_reads(chip->client, DA9034_STATUS_A, 2, v);
if (ret)
return ret;
*status = (v[1] << 8) | v[0];
return 0;
}
static void da903x_irq_work(struct work_struct *work)
{
struct da903x_chip *chip =
container_of(work, struct da903x_chip, irq_work);
unsigned int events = 0;
while (1) {
if (chip->ops->read_events(chip, &events))
break;
events &= ~chip->events_mask;
if (events == 0)
break;
blocking_notifier_call_chain(
&chip->notifier_list, events, NULL);
}
enable_irq(chip->client->irq);
}
static irqreturn_t da903x_irq_handler(int irq, void *data)
{
struct da903x_chip *chip = data;
disable_irq_nosync(irq);
(void)schedule_work(&chip->irq_work);
return IRQ_HANDLED;
}
static struct da903x_chip_ops da903x_ops[] = {
[0] = {
.init_chip = da9030_init_chip,
.unmask_events = da9030_unmask_events,
.mask_events = da9030_mask_events,
.read_events = da9030_read_events,
.read_status = da9030_read_status,
},
[1] = {
.init_chip = da9034_init_chip,
.unmask_events = da9034_unmask_events,
.mask_events = da9034_mask_events,
.read_events = da9034_read_events,
.read_status = da9034_read_status,
}
};
static const struct i2c_device_id da903x_id_table[] = {
{ "da9030", 0 },
{ "da9034", 1 },
{ },
};
MODULE_DEVICE_TABLE(i2c, da903x_id_table);
static int __remove_subdev(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static int da903x_remove_subdevs(struct da903x_chip *chip)
{
return device_for_each_child(chip->dev, NULL, __remove_subdev);
}
static int __devinit da903x_add_subdevs(struct da903x_chip *chip,
struct da903x_platform_data *pdata)
{
struct da903x_subdev_info *subdev;
struct platform_device *pdev;
int i, ret = 0;
for (i = 0; i < pdata->num_subdevs; i++) {
subdev = &pdata->subdevs[i];
pdev = platform_device_alloc(subdev->name, subdev->id);
if (!pdev) {
ret = -ENOMEM;
goto failed;
}
pdev->dev.parent = chip->dev;
pdev->dev.platform_data = subdev->platform_data;
ret = platform_device_add(pdev);
if (ret) {
platform_device_put(pdev);
goto failed;
}
}
return 0;
failed:
da903x_remove_subdevs(chip);
return ret;
}
static int __devinit da903x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct da903x_platform_data *pdata = client->dev.platform_data;
struct da903x_chip *chip;
unsigned int tmp;
int ret;
chip = kzalloc(sizeof(struct da903x_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
chip->client = client;
chip->dev = &client->dev;
chip->ops = &da903x_ops[id->driver_data];
mutex_init(&chip->lock);
INIT_WORK(&chip->irq_work, da903x_irq_work);
BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
i2c_set_clientdata(client, chip);
ret = chip->ops->init_chip(chip);
if (ret)
goto out_free_chip;
/* mask and clear all IRQs */
chip->events_mask = 0xffffffff;
chip->ops->mask_events(chip, chip->events_mask);
chip->ops->read_events(chip, &tmp);
ret = request_irq(client->irq, da903x_irq_handler,
IRQF_TRIGGER_FALLING,
"da903x", chip);
if (ret) {
dev_err(&client->dev, "failed to request irq %d\n",
client->irq);
goto out_free_chip;
}
ret = da903x_add_subdevs(chip, pdata);
if (ret)
goto out_free_irq;
return 0;
out_free_irq:
free_irq(client->irq, chip);
out_free_chip:
kfree(chip);
return ret;
}
static int __devexit da903x_remove(struct i2c_client *client)
{
struct da903x_chip *chip = i2c_get_clientdata(client);
da903x_remove_subdevs(chip);
free_irq(client->irq, chip);
kfree(chip);
return 0;
}
static struct i2c_driver da903x_driver = {
.driver = {
.name = "da903x",
.owner = THIS_MODULE,
},
.probe = da903x_probe,
.remove = __devexit_p(da903x_remove),
.id_table = da903x_id_table,
};
static int __init da903x_init(void)
{
return i2c_add_driver(&da903x_driver);
}
subsys_initcall(da903x_init);
static void __exit da903x_exit(void)
{
i2c_del_driver(&da903x_driver);
}
module_exit(da903x_exit);
MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
"Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL");
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