mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-18 15:09:53 +00:00
gpio: adp5588-gpio: support interrupt controller
Implement irq_chip functionality on ADP5588/5587 GPIO expanders. Only level sensitive interrupts are supported. Interrupts provided by this irq_chip must be requested using request_threaded_irq(). Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Hennerich
Linus Torvalds
parent
ead6db0843
commit
459773ae8d
@ -272,6 +272,13 @@ config GPIO_ADP5588
|
||||
To compile this driver as a module, choose M here: the module will be
|
||||
called adp5588-gpio.
|
||||
|
||||
config GPIO_ADP5588_IRQ
|
||||
bool "Interrupt controller support for ADP5588"
|
||||
depends on GPIO_ADP5588=y
|
||||
help
|
||||
Say yes here to enable the adp5588 to be used as an interrupt
|
||||
controller. It requires the driver to be built in the kernel.
|
||||
|
||||
comment "PCI GPIO expanders:"
|
||||
|
||||
config GPIO_CS5535
|
||||
|
||||
@ -1,8 +1,8 @@
|
||||
/*
|
||||
* GPIO Chip driver for Analog Devices
|
||||
* ADP5588 I/O Expander and QWERTY Keypad Controller
|
||||
* ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
|
||||
*
|
||||
* Copyright 2009 Analog Devices Inc.
|
||||
* Copyright 2009-2010 Analog Devices Inc.
|
||||
*
|
||||
* Licensed under the GPL-2 or later.
|
||||
*/
|
||||
@ -13,21 +13,34 @@
|
||||
#include <linux/init.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/irq.h>
|
||||
|
||||
#include <linux/i2c/adp5588.h>
|
||||
|
||||
#define DRV_NAME "adp5588-gpio"
|
||||
#define MAXGPIO 18
|
||||
#define ADP_BANK(offs) ((offs) >> 3)
|
||||
#define ADP_BIT(offs) (1u << ((offs) & 0x7))
|
||||
#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;
|
||||
unsigned gpio_start;
|
||||
unsigned irq_base;
|
||||
uint8_t dat_out[3];
|
||||
uint8_t dir[3];
|
||||
uint8_t int_lvl[3];
|
||||
uint8_t int_en[3];
|
||||
uint8_t irq_mask[3];
|
||||
uint8_t irq_stat[3];
|
||||
};
|
||||
|
||||
static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
|
||||
@ -55,8 +68,8 @@ static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
|
||||
struct adp5588_gpio *dev =
|
||||
container_of(chip, struct adp5588_gpio, gpio_chip);
|
||||
|
||||
return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off))
|
||||
& ADP_BIT(off));
|
||||
return !!(adp5588_gpio_read(dev->client,
|
||||
GPIO_DAT_STAT1 + ADP5588_BANK(off)) & ADP5588_BIT(off));
|
||||
}
|
||||
|
||||
static void adp5588_gpio_set_value(struct gpio_chip *chip,
|
||||
@ -66,8 +79,8 @@ static void adp5588_gpio_set_value(struct gpio_chip *chip,
|
||||
struct adp5588_gpio *dev =
|
||||
container_of(chip, struct adp5588_gpio, gpio_chip);
|
||||
|
||||
bank = ADP_BANK(off);
|
||||
bit = ADP_BIT(off);
|
||||
bank = ADP5588_BANK(off);
|
||||
bit = ADP5588_BIT(off);
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
if (val)
|
||||
@ -87,10 +100,10 @@ static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
|
||||
struct adp5588_gpio *dev =
|
||||
container_of(chip, struct adp5588_gpio, gpio_chip);
|
||||
|
||||
bank = ADP_BANK(off);
|
||||
bank = ADP5588_BANK(off);
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
dev->dir[bank] &= ~ADP_BIT(off);
|
||||
dev->dir[bank] &= ~ADP5588_BIT(off);
|
||||
ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
@ -105,8 +118,8 @@ static int adp5588_gpio_direction_output(struct gpio_chip *chip,
|
||||
struct adp5588_gpio *dev =
|
||||
container_of(chip, struct adp5588_gpio, gpio_chip);
|
||||
|
||||
bank = ADP_BANK(off);
|
||||
bit = ADP_BIT(off);
|
||||
bank = ADP5588_BANK(off);
|
||||
bit = ADP5588_BIT(off);
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
dev->dir[bank] |= bit;
|
||||
@ -125,6 +138,213 @@ static int adp5588_gpio_direction_output(struct gpio_chip *chip,
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_GPIO_ADP5588_IRQ
|
||||
static int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off)
|
||||
{
|
||||
struct adp5588_gpio *dev =
|
||||
container_of(chip, struct adp5588_gpio, gpio_chip);
|
||||
return dev->irq_base + off;
|
||||
}
|
||||
|
||||
static void adp5588_irq_bus_lock(unsigned int irq)
|
||||
{
|
||||
struct adp5588_gpio *dev = get_irq_chip_data(irq);
|
||||
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(unsigned int irq)
|
||||
{
|
||||
struct adp5588_gpio *dev = get_irq_chip_data(irq);
|
||||
int i;
|
||||
|
||||
for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++)
|
||||
if (dev->int_en[i] ^ dev->irq_mask[i]) {
|
||||
dev->int_en[i] = dev->irq_mask[i];
|
||||
adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
|
||||
dev->int_en[i]);
|
||||
}
|
||||
|
||||
mutex_unlock(&dev->irq_lock);
|
||||
}
|
||||
|
||||
static void adp5588_irq_mask(unsigned int irq)
|
||||
{
|
||||
struct adp5588_gpio *dev = get_irq_chip_data(irq);
|
||||
unsigned gpio = irq - dev->irq_base;
|
||||
|
||||
dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio);
|
||||
}
|
||||
|
||||
static void adp5588_irq_unmask(unsigned int irq)
|
||||
{
|
||||
struct adp5588_gpio *dev = get_irq_chip_data(irq);
|
||||
unsigned gpio = irq - dev->irq_base;
|
||||
|
||||
dev->irq_mask[ADP5588_BANK(gpio)] |= ADP5588_BIT(gpio);
|
||||
}
|
||||
|
||||
static int adp5588_irq_set_type(unsigned int irq, unsigned int type)
|
||||
{
|
||||
struct adp5588_gpio *dev = get_irq_chip_data(irq);
|
||||
uint16_t gpio = irq - dev->irq_base;
|
||||
unsigned bank, bit;
|
||||
|
||||
if ((type & IRQ_TYPE_EDGE_BOTH)) {
|
||||
dev_err(&dev->client->dev, "irq %d: unsupported type %d\n",
|
||||
irq, type);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
bank = ADP5588_BANK(gpio);
|
||||
bit = ADP5588_BIT(gpio);
|
||||
|
||||
if (type & IRQ_TYPE_LEVEL_HIGH)
|
||||
dev->int_lvl[bank] |= bit;
|
||||
else if (type & IRQ_TYPE_LEVEL_LOW)
|
||||
dev->int_lvl[bank] &= ~bit;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
adp5588_gpio_direction_input(&dev->gpio_chip, gpio);
|
||||
adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank,
|
||||
dev->int_lvl[bank]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct irq_chip adp5588_irq_chip = {
|
||||
.name = "adp5588",
|
||||
.mask = adp5588_irq_mask,
|
||||
.unmask = adp5588_irq_unmask,
|
||||
.bus_lock = adp5588_irq_bus_lock,
|
||||
.bus_sync_unlock = adp5588_irq_bus_sync_unlock,
|
||||
.set_type = adp5588_irq_set_type,
|
||||
};
|
||||
|
||||
static int adp5588_gpio_read_intstat(struct i2c_client *client, u8 *buf)
|
||||
{
|
||||
int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf);
|
||||
|
||||
if (ret < 0)
|
||||
dev_err(&client->dev, "Read INT_STAT Error\n");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static irqreturn_t adp5588_irq_handler(int irq, void *devid)
|
||||
{
|
||||
struct adp5588_gpio *dev = devid;
|
||||
unsigned status, bank, bit, pending;
|
||||
int ret;
|
||||
status = adp5588_gpio_read(dev->client, INT_STAT);
|
||||
|
||||
if (status & ADP5588_GPI_INT) {
|
||||
ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat);
|
||||
if (ret < 0)
|
||||
memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));
|
||||
|
||||
for (bank = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
|
||||
bank++, bit = 0) {
|
||||
pending = dev->irq_stat[bank] & dev->irq_mask[bank];
|
||||
|
||||
while (pending) {
|
||||
if (pending & (1 << bit)) {
|
||||
handle_nested_irq(dev->irq_base +
|
||||
(bank << 3) + bit);
|
||||
pending &= ~(1 << bit);
|
||||
|
||||
}
|
||||
bit++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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;
|
||||
struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
|
||||
unsigned gpio;
|
||||
int ret;
|
||||
|
||||
adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
|
||||
adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
|
||||
adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */
|
||||
|
||||
dev->irq_base = pdata->irq_base;
|
||||
mutex_init(&dev->irq_lock);
|
||||
|
||||
for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) {
|
||||
int irq = gpio + dev->irq_base;
|
||||
set_irq_chip_data(irq, dev);
|
||||
set_irq_chip_and_handler(irq, &adp5588_irq_chip,
|
||||
handle_level_irq);
|
||||
set_irq_nested_thread(irq, 1);
|
||||
#ifdef CONFIG_ARM
|
||||
/*
|
||||
* ARM needs us to explicitly flag the IRQ as VALID,
|
||||
* once we do so, it will also set the noprobe.
|
||||
*/
|
||||
set_irq_flags(irq, IRQF_VALID);
|
||||
#else
|
||||
set_irq_noprobe(irq);
|
||||
#endif
|
||||
}
|
||||
|
||||
ret = request_threaded_irq(client->irq,
|
||||
NULL,
|
||||
adp5588_irq_handler,
|
||||
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
||||
dev_name(&client->dev), dev);
|
||||
if (ret) {
|
||||
dev_err(&client->dev, "failed to request irq %d\n",
|
||||
client->irq);
|
||||
goto out;
|
||||
}
|
||||
|
||||
dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
|
||||
adp5588_gpio_write(client, CFG,
|
||||
ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
dev->irq_base = 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void adp5588_irq_teardown(struct adp5588_gpio *dev)
|
||||
{
|
||||
if (dev->irq_base)
|
||||
free_irq(dev->client->irq, dev);
|
||||
}
|
||||
|
||||
#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;
|
||||
}
|
||||
|
||||
static void adp5588_irq_teardown(struct adp5588_gpio *dev)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_GPIO_ADP5588_IRQ */
|
||||
|
||||
static int __devinit adp5588_gpio_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
@ -160,37 +380,46 @@ static int __devinit adp5588_gpio_probe(struct i2c_client *client,
|
||||
gc->can_sleep = 1;
|
||||
|
||||
gc->base = pdata->gpio_start;
|
||||
gc->ngpio = MAXGPIO;
|
||||
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)
|
||||
goto err;
|
||||
|
||||
revid = ret & ADP5588_DEVICE_ID_MASK;
|
||||
|
||||
for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) {
|
||||
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,
|
||||
(pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
|
||||
|
||||
ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
|
||||
if (ret)
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (pdata->irq_base) {
|
||||
if (WA_DELAYED_READOUT_REVID(revid)) {
|
||||
dev_warn(&client->dev, "GPIO int not supported\n");
|
||||
} else {
|
||||
ret = adp5588_irq_setup(dev);
|
||||
if (ret)
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
ret = gpiochip_add(&dev->gpio_chip);
|
||||
if (ret)
|
||||
goto err;
|
||||
goto err_irq;
|
||||
|
||||
dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n",
|
||||
dev_info(&client->dev, "gpios %d..%d (IRQ Base %d) on a %s Rev. %d\n",
|
||||
gc->base, gc->base + gc->ngpio - 1,
|
||||
client->name, revid);
|
||||
pdata->irq_base, client->name, revid);
|
||||
|
||||
if (pdata->setup) {
|
||||
ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
|
||||
@ -199,8 +428,11 @@ static int __devinit adp5588_gpio_probe(struct i2c_client *client,
|
||||
}
|
||||
|
||||
i2c_set_clientdata(client, dev);
|
||||
|
||||
return 0;
|
||||
|
||||
err_irq:
|
||||
adp5588_irq_teardown(dev);
|
||||
err:
|
||||
kfree(dev);
|
||||
return ret;
|
||||
@ -222,6 +454,9 @@ static int __devexit adp5588_gpio_remove(struct i2c_client *client)
|
||||
}
|
||||
}
|
||||
|
||||
if (dev->irq_base)
|
||||
free_irq(dev->client->irq, dev);
|
||||
|
||||
ret = gpiochip_remove(&dev->gpio_chip);
|
||||
if (ret) {
|
||||
dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
|
||||
|
||||
@ -74,6 +74,20 @@
|
||||
|
||||
#define ADP5588_DEVICE_ID_MASK 0xF
|
||||
|
||||
/* Configuration Register1 */
|
||||
#define ADP5588_AUTO_INC (1 << 7)
|
||||
#define ADP5588_GPIEM_CFG (1 << 6)
|
||||
#define ADP5588_INT_CFG (1 << 4)
|
||||
#define ADP5588_GPI_IEN (1 << 1)
|
||||
|
||||
/* Interrupt Status Register */
|
||||
#define ADP5588_GPI_INT (1 << 1)
|
||||
#define ADP5588_KE_INT (1 << 0)
|
||||
|
||||
#define ADP5588_MAXGPIO 18
|
||||
#define ADP5588_BANK(offs) ((offs) >> 3)
|
||||
#define ADP5588_BIT(offs) (1u << ((offs) & 0x7))
|
||||
|
||||
/* Put one of these structures in i2c_board_info platform_data */
|
||||
|
||||
#define ADP5588_KEYMAPSIZE 80
|
||||
@ -128,6 +142,7 @@ struct adp5588_kpad_platform_data {
|
||||
|
||||
struct adp5588_gpio_platform_data {
|
||||
unsigned gpio_start; /* GPIO Chip base # */
|
||||
unsigned irq_base; /* interrupt base # */
|
||||
unsigned pullup_dis_mask; /* Pull-Up Disable Mask */
|
||||
int (*setup)(struct i2c_client *client,
|
||||
int gpio, unsigned ngpio,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user