blob: c4a5b499f53e31305b19bf5503c3ec1d14b46432 [file] [log] [blame]
/*
* GPIO Chip driver for Analog Devices
* ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
*
* Copyright 2009-2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/platform_data/adp5588.h>
#define DRV_NAME "adp5588-gpio"
/*
* Early pre 4.0 Silicon required to delay readout by at least 25ms,
* since the Event Counter Register updated 25ms after the interrupt
* asserted.
*/
#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
struct adp5588_gpio {
struct i2c_client *client;
struct gpio_chip gpio_chip;
struct mutex lock; /* protect cached dir, dat_out */
/* protect serialized access to the interrupt controller bus */
struct mutex irq_lock;
uint8_t dat_out[3];
uint8_t dir[3];
uint8_t int_lvl_low[3];
uint8_t int_lvl_high[3];
uint8_t int_en[3];
uint8_t irq_mask[3];
uint8_t int_input_en[3];
};
static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
{
int ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev, "Read Error\n");
return ret;
}
static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0)
dev_err(&client->dev, "Write Error\n");
return ret;
}
static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
struct adp5588_gpio *dev = gpiochip_get_data(chip);
unsigned bank = ADP5588_BANK(off);
unsigned bit = ADP5588_BIT(off);
int val;
mutex_lock(&dev->lock);
if (dev->dir[bank] & bit)
val = dev->dat_out[bank];
else
val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);
mutex_unlock(&dev->lock);
return !!(val & bit);
}
static void adp5588_gpio_set_value(struct gpio_chip *chip,
unsigned off, int val)
{
unsigned bank, bit;
struct adp5588_gpio *dev = gpiochip_get_data(chip);
bank = ADP5588_BANK(off);
bit = ADP5588_BIT(off);
mutex_lock(&dev->lock);
if (val)
dev->dat_out[bank] |= bit;
else
dev->dat_out[bank] &= ~bit;
adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
dev->dat_out[bank]);
mutex_unlock(&dev->lock);
}
static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
int ret;
unsigned bank;
struct adp5588_gpio *dev = gpiochip_get_data(chip);
bank = ADP5588_BANK(off);
mutex_lock(&dev->lock);
dev->dir[bank] &= ~ADP5588_BIT(off);
ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
mutex_unlock(&dev->lock);
return ret;
}
static int adp5588_gpio_direction_output(struct gpio_chip *chip,
unsigned off, int val)
{
int ret;
unsigned bank, bit;
struct adp5588_gpio *dev = gpiochip_get_data(chip);
bank = ADP5588_BANK(off);
bit = ADP5588_BIT(off);
mutex_lock(&dev->lock);
dev->dir[bank] |= bit;
if (val)
dev->dat_out[bank] |= bit;
else
dev->dat_out[bank] &= ~bit;
ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
dev->dat_out[bank]);
ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
dev->dir[bank]);
mutex_unlock(&dev->lock);
return ret;
}
#ifdef CONFIG_GPIO_ADP5588_IRQ
static void adp5588_irq_bus_lock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
mutex_lock(&dev->irq_lock);
}
/*
* genirq core code can issue chip->mask/unmask from atomic context.
* This doesn't work for slow busses where an access needs to sleep.
* bus_sync_unlock() is therefore called outside the atomic context,
* syncs the current irq mask state with the slow external controller
* and unlocks the bus.
*/
static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
int i;
for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
if (dev->int_input_en[i]) {
mutex_lock(&dev->lock);
dev->dir[i] &= ~dev->int_input_en[i];
dev->int_input_en[i] = 0;
adp5588_gpio_write(dev->client, GPIO_DIR1 + i,
dev->dir[i]);
mutex_unlock(&dev->lock);
}
if (dev->int_en[i] ^ dev->irq_mask[i]) {
dev->int_en[i] = dev->irq_mask[i];
adp5588_gpio_write(dev->client, GPI_EM1 + i,
dev->int_en[i]);
}
}
mutex_unlock(&dev->irq_lock);
}
static void adp5588_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
dev->irq_mask[ADP5588_BANK(d->hwirq)] &= ~ADP5588_BIT(d->hwirq);
}
static void adp5588_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
dev->irq_mask[ADP5588_BANK(d->hwirq)] |= ADP5588_BIT(d->hwirq);
}
static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
uint16_t gpio = d->hwirq;
unsigned bank, bit;
bank = ADP5588_BANK(gpio);
bit = ADP5588_BIT(gpio);
dev->int_lvl_low[bank] &= ~bit;
dev->int_lvl_high[bank] &= ~bit;
if (type & IRQ_TYPE_EDGE_BOTH || type & IRQ_TYPE_LEVEL_HIGH)
dev->int_lvl_high[bank] |= bit;
if (type & IRQ_TYPE_EDGE_BOTH || type & IRQ_TYPE_LEVEL_LOW)
dev->int_lvl_low[bank] |= bit;
dev->int_input_en[bank] |= bit;
return 0;
}
static struct irq_chip adp5588_irq_chip = {
.name = "adp5588",
.irq_mask = adp5588_irq_mask,
.irq_unmask = adp5588_irq_unmask,
.irq_bus_lock = adp5588_irq_bus_lock,
.irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
.irq_set_type = adp5588_irq_set_type,
};
static irqreturn_t adp5588_irq_handler(int irq, void *devid)
{
struct adp5588_gpio *dev = devid;
int status = adp5588_gpio_read(dev->client, INT_STAT);
if (status & ADP5588_KE_INT) {
int ev_cnt = adp5588_gpio_read(dev->client, KEY_LCK_EC_STAT);
if (ev_cnt > 0) {
int i;
for (i = 0; i < (ev_cnt & ADP5588_KEC); i++) {
int key = adp5588_gpio_read(dev->client,
Key_EVENTA + i);
/* GPIN events begin at 97,
* bit 7 indicates logic level
*/
int gpio = (key & 0x7f) - 97;
int lvl = key & (1 << 7);
int bank = ADP5588_BANK(gpio);
int bit = ADP5588_BIT(gpio);
if ((lvl && dev->int_lvl_high[bank] & bit) ||
(!lvl && dev->int_lvl_low[bank] & bit))
handle_nested_irq(irq_find_mapping(
dev->gpio_chip.irq.domain, gpio));
}
}
}
adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
return IRQ_HANDLED;
}
static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
struct i2c_client *client = dev->client;
int ret;
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
int irq_base = pdata ? pdata->irq_base : 0;
adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
mutex_init(&dev->irq_lock);
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, adp5588_irq_handler, IRQF_ONESHOT
| IRQF_TRIGGER_FALLING | IRQF_SHARED,
dev_name(&client->dev), dev);
if (ret) {
dev_err(&client->dev, "failed to request irq %d\n",
client->irq);
return ret;
}
ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
&adp5588_irq_chip, irq_base,
handle_simple_irq,
IRQ_TYPE_NONE);
if (ret) {
dev_err(&client->dev,
"could not connect irqchip to gpiochip\n");
return ret;
}
gpiochip_set_nested_irqchip(&dev->gpio_chip,
&adp5588_irq_chip,
client->irq);
adp5588_gpio_write(client, CFG,
ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_KE_IEN);
return 0;
}
#else
static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
struct i2c_client *client = dev->client;
dev_warn(&client->dev, "interrupt support not compiled in\n");
return 0;
}
#endif /* CONFIG_GPIO_ADP5588_IRQ */
static int adp5588_gpio_probe(struct i2c_client *client)
{
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp5588_gpio *dev;
struct gpio_chip *gc;
int ret, i, revid;
unsigned int pullup_dis_mask = 0;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
return -EIO;
}
dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->client = client;
gc = &dev->gpio_chip;
gc->direction_input = adp5588_gpio_direction_input;
gc->direction_output = adp5588_gpio_direction_output;
gc->get = adp5588_gpio_get_value;
gc->set = adp5588_gpio_set_value;
gc->can_sleep = true;
gc->base = -1;
gc->parent = &client->dev;
if (pdata) {
gc->base = pdata->gpio_start;
gc->names = pdata->names;
pullup_dis_mask = pdata->pullup_dis_mask;
}
gc->ngpio = ADP5588_MAXGPIO;
gc->label = client->name;
gc->owner = THIS_MODULE;
mutex_init(&dev->lock);
ret = adp5588_gpio_read(dev->client, DEV_ID);
if (ret < 0)
return ret;
revid = ret & ADP5588_DEVICE_ID_MASK;
for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
(pullup_dis_mask >> (8 * i)) & 0xFF);
ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
if (ret)
return ret;
}
if (client->irq) {
if (WA_DELAYED_READOUT_REVID(revid)) {
dev_warn(&client->dev, "GPIO int not supported\n");
} else {
ret = adp5588_irq_setup(dev);
if (ret)
return ret;
}
}
ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
if (ret)
return ret;
if (pdata && pdata->setup) {
ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, dev);
return 0;
}
static int adp5588_gpio_remove(struct i2c_client *client)
{
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp5588_gpio *dev = i2c_get_clientdata(client);
int ret;
if (pdata && pdata->teardown) {
ret = pdata->teardown(client,
dev->gpio_chip.base, dev->gpio_chip.ngpio,
pdata->context);
if (ret < 0) {
dev_err(&client->dev, "teardown failed %d\n", ret);
return ret;
}
}
if (dev->client->irq)
free_irq(dev->client->irq, dev);
return 0;
}
static const struct i2c_device_id adp5588_gpio_id[] = {
{DRV_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
#ifdef CONFIG_OF
static const struct of_device_id adp5588_gpio_of_id[] = {
{ .compatible = "adi," DRV_NAME, },
{},
};
MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
#endif
static struct i2c_driver adp5588_gpio_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(adp5588_gpio_of_id),
},
.probe_new = adp5588_gpio_probe,
.remove = adp5588_gpio_remove,
.id_table = adp5588_gpio_id,
};
module_i2c_driver(adp5588_gpio_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("GPIO ADP5588 Driver");
MODULE_LICENSE("GPL");