davidlt/kernel-ark
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
949b9decae
kernel-ark/drivers/mfd/tps6586x.c
Stephen Warren 4d1cdbf696 mfd: Remove tps6586x device ID check 
... and convert it to a dev_info print at probe time.

There are many variants of this chip with different values of VERSIONCRC.
The set of values is large, and not useful to enumerate. All are SW
compatible. The difference lies in default settings of the various power
rails, and other similar differences. The driver, or clients of the
driver, shouldn't be affected by this, since all rails should be
programmed into the desired state in all cases for correct operation.

Derived-from-code-by: Andrew Chew <achew@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2011-01-14 12:37:48 +01:00

591 lines
14 KiB
C
Raw Blame History

/*
* Core driver for TI TPS6586x PMIC family
*
* Copyright (c) 2010 CompuLab Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* Based on da903x.c.
* 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/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6586x.h>
/* GPIO control registers */
#define TPS6586X_GPIOSET1 0x5d
#define TPS6586X_GPIOSET2 0x5e
/* interrupt control registers */
#define TPS6586X_INT_ACK1 0xb5
#define TPS6586X_INT_ACK2 0xb6
#define TPS6586X_INT_ACK3 0xb7
#define TPS6586X_INT_ACK4 0xb8
/* interrupt mask registers */
#define TPS6586X_INT_MASK1 0xb0
#define TPS6586X_INT_MASK2 0xb1
#define TPS6586X_INT_MASK3 0xb2
#define TPS6586X_INT_MASK4 0xb3
#define TPS6586X_INT_MASK5 0xb4
/* device id */
#define TPS6586X_VERSIONCRC 0xcd
struct tps6586x_irq_data {
u8 mask_reg;
u8 mask_mask;
};
#define TPS6586X_IRQ(_reg, _mask) \
{ \
.mask_reg = (_reg) - TPS6586X_INT_MASK1, \
.mask_mask = (_mask), \
}
static const struct tps6586x_irq_data tps6586x_irqs[] = {
[TPS6586X_INT_PLDO_0] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
[TPS6586X_INT_PLDO_1] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
[TPS6586X_INT_PLDO_2] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
[TPS6586X_INT_PLDO_3] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
[TPS6586X_INT_PLDO_4] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
[TPS6586X_INT_PLDO_5] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
[TPS6586X_INT_PLDO_6] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
[TPS6586X_INT_PLDO_7] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
[TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
[TPS6586X_INT_ADC] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
[TPS6586X_INT_PLDO_8] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
[TPS6586X_INT_PLDO_9] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
[TPS6586X_INT_PSM_0] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
[TPS6586X_INT_PSM_1] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
[TPS6586X_INT_PSM_2] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
[TPS6586X_INT_PSM_3] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
[TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
[TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
[TPS6586X_INT_USB_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
[TPS6586X_INT_AC_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
[TPS6586X_INT_BAT_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
[TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
[TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
[TPS6586X_INT_PP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
[TPS6586X_INT_RESUME] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
[TPS6586X_INT_LOW_SYS] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
[TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
};
struct tps6586x {
struct mutex lock;
struct device *dev;
struct i2c_client *client;
struct gpio_chip gpio;
struct irq_chip irq_chip;
struct mutex irq_lock;
int irq_base;
u32 irq_en;
u8 mask_cache[5];
u8 mask_reg[5];
};
static inline int __tps6586x_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 __tps6586x_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 __tps6586x_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 __tps6586x_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 tps6586x_write(struct device *dev, int reg, uint8_t val)
{
return __tps6586x_write(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(tps6586x_write);
int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
{
return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
}
EXPORT_SYMBOL_GPL(tps6586x_writes);
int tps6586x_read(struct device *dev, int reg, uint8_t *val)
{
return __tps6586x_read(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(tps6586x_read);
int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
{
return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
}
EXPORT_SYMBOL_GPL(tps6586x_reads);
int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct tps6586x *tps6586x = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&tps6586x->lock);
ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
if (ret)
goto out;
if ((reg_val & bit_mask) == 0) {
reg_val |= bit_mask;
ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
}
out:
mutex_unlock(&tps6586x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_set_bits);
int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct tps6586x *tps6586x = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&tps6586x->lock);
ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
if (ret)
goto out;
if (reg_val & bit_mask) {
reg_val &= ~bit_mask;
ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
}
out:
mutex_unlock(&tps6586x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
{
struct tps6586x *tps6586x = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&tps6586x->lock);
ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
if (ret)
goto out;
if ((reg_val & mask) != val) {
reg_val = (reg_val & ~mask) | val;
ret = __tps6586x_write(tps6586x->client, reg, reg_val);
}
out:
mutex_unlock(&tps6586x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_update);
static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
uint8_t val;
int ret;
ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
if (ret)
return ret;
return !!(val & (1 << offset));
}
static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
int value)
{
struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);
__tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,
value << offset);
}
static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
int value)
{
struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
uint8_t val, mask;
tps6586x_gpio_set(gc, offset, value);
val = 0x1 << (offset * 2);
mask = 0x3 << (offset * 2);
return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
}
static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
{
int ret;
if (!gpio_base)
return;
tps6586x->gpio.owner = THIS_MODULE;
tps6586x->gpio.label = tps6586x->client->name;
tps6586x->gpio.dev = tps6586x->dev;
tps6586x->gpio.base = gpio_base;
tps6586x->gpio.ngpio = 4;
tps6586x->gpio.can_sleep = 1;
/* FIXME: add handling of GPIOs as dedicated inputs */
tps6586x->gpio.direction_output = tps6586x_gpio_output;
tps6586x->gpio.set = tps6586x_gpio_set;
tps6586x->gpio.get = tps6586x_gpio_get;
ret = gpiochip_add(&tps6586x->gpio);
if (ret)
dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);
}
static int __remove_subdev(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
{
return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
}
static void tps6586x_irq_lock(unsigned int irq)
{
struct tps6586x *tps6586x = get_irq_chip_data(irq);
mutex_lock(&tps6586x->irq_lock);
}
static void tps6586x_irq_enable(unsigned int irq)
{
struct tps6586x *tps6586x = get_irq_chip_data(irq);
unsigned int __irq = irq - tps6586x->irq_base;
const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
tps6586x->irq_en |= (1 << __irq);
}
static void tps6586x_irq_disable(unsigned int irq)
{
struct tps6586x *tps6586x = get_irq_chip_data(irq);
unsigned int __irq = irq - tps6586x->irq_base;
const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
tps6586x->irq_en &= ~(1 << __irq);
}
static void tps6586x_irq_sync_unlock(unsigned int irq)
{
struct tps6586x *tps6586x = get_irq_chip_data(irq);
int i;
for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
if (!WARN_ON(tps6586x_write(tps6586x->dev,
TPS6586X_INT_MASK1 + i,
tps6586x->mask_reg[i])))
tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
}
}
mutex_unlock(&tps6586x->irq_lock);
}
static irqreturn_t tps6586x_irq(int irq, void *data)
{
struct tps6586x *tps6586x = data;
u32 acks;
int ret = 0;
ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
sizeof(acks), (uint8_t *)&acks);
if (ret < 0) {
dev_err(tps6586x->dev, "failed to read interrupt status\n");
return IRQ_NONE;
}
acks = le32_to_cpu(acks);
while (acks) {
int i = __ffs(acks);
if (tps6586x->irq_en & (1 << i))
handle_nested_irq(tps6586x->irq_base + i);
acks &= ~(1 << i);
}
return IRQ_HANDLED;
}
static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
int irq_base)
{
int i, ret;
u8 tmp[4];
if (!irq_base) {
dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
return -EINVAL;
}
mutex_init(&tps6586x->irq_lock);
for (i = 0; i < 5; i++) {
tps6586x->mask_cache[i] = 0xff;
tps6586x->mask_reg[i] = 0xff;
tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
}
tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
tps6586x->irq_base = irq_base;
tps6586x->irq_chip.name = "tps6586x";
tps6586x->irq_chip.enable = tps6586x_irq_enable;
tps6586x->irq_chip.disable = tps6586x_irq_disable;
tps6586x->irq_chip.bus_lock = tps6586x_irq_lock;
tps6586x->irq_chip.bus_sync_unlock = tps6586x_irq_sync_unlock;
for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
int __irq = i + tps6586x->irq_base;
set_irq_chip_data(__irq, tps6586x);
set_irq_chip_and_handler(__irq, &tps6586x->irq_chip,
handle_simple_irq);
set_irq_nested_thread(__irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(__irq, IRQF_VALID);
#endif
}
ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
"tps6586x", tps6586x);
if (!ret) {
device_init_wakeup(tps6586x->dev, 1);
enable_irq_wake(irq);
}
return ret;
}
static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
struct tps6586x_platform_data *pdata)
{
struct tps6586x_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 = tps6586x->dev;
pdev->dev.platform_data = subdev->platform_data;
ret = platform_device_add(pdev);
if (ret) {
platform_device_put(pdev);
goto failed;
}
}
return 0;
failed:
tps6586x_remove_subdevs(tps6586x);
return ret;
}
static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps6586x_platform_data *pdata = client->dev.platform_data;
struct tps6586x *tps6586x;
int ret;
if (!pdata) {
dev_err(&client->dev, "tps6586x requires platform data\n");
return -ENOTSUPP;
}
ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
if (ret < 0) {
dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
return -EIO;
}
dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
if (tps6586x == NULL)
return -ENOMEM;
tps6586x->client = client;
tps6586x->dev = &client->dev;
i2c_set_clientdata(client, tps6586x);
mutex_init(&tps6586x->lock);
if (client->irq) {
ret = tps6586x_irq_init(tps6586x, client->irq,
pdata->irq_base);
if (ret) {
dev_err(&client->dev, "IRQ init failed: %d\n", ret);
goto err_irq_init;
}
}
ret = tps6586x_add_subdevs(tps6586x, pdata);
if (ret) {
dev_err(&client->dev, "add devices failed: %d\n", ret);
goto err_add_devs;
}
tps6586x_gpio_init(tps6586x, pdata->gpio_base);
return 0;
err_add_devs:
if (client->irq)
free_irq(client->irq, tps6586x);
err_irq_init:
kfree(tps6586x);
return ret;
}
static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
{
struct tps6586x *tps6586x = i2c_get_clientdata(client);
struct tps6586x_platform_data *pdata = client->dev.platform_data;
int ret;
if (client->irq)
free_irq(client->irq, tps6586x);
if (pdata->gpio_base) {
ret = gpiochip_remove(&tps6586x->gpio);
if (ret)
dev_err(&client->dev, "Can't remove gpio chip: %d\n",
ret);
}
tps6586x_remove_subdevs(tps6586x);
kfree(tps6586x);
return 0;
}
static const struct i2c_device_id tps6586x_id_table[] = {
{ "tps6586x", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
static struct i2c_driver tps6586x_driver = {
.driver = {
.name = "tps6586x",
.owner = THIS_MODULE,
},
.probe = tps6586x_i2c_probe,
.remove = __devexit_p(tps6586x_i2c_remove),
.id_table = tps6586x_id_table,
};
static int __init tps6586x_init(void)
{
return i2c_add_driver(&tps6586x_driver);
}
subsys_initcall(tps6586x_init);
static void __exit tps6586x_exit(void)
{
i2c_del_driver(&tps6586x_driver);
}
module_exit(tps6586x_exit);
MODULE_DESCRIPTION("TPS6586X core driver");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink