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gpio: max732x: Rewrite IRQ code to use irq_domain API

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Signed-off-by: Semen Protsenko <semen.protsenko@globallogic.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Semen Protsenko 2015-01-13 15:41:43 +02:00 committed by Linus Walleij
parent 43c4bcf942
commit 479f8a5744
2 changed files with 66 additions and 35 deletions
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1
drivers/gpio/Kconfig
View File

@ -528,6 +528,7 @@ config GPIO_MAX7300
config GPIO_MAX732X
tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
depends on I2C
select IRQ_DOMAIN
help
Say yes here to support the MAX7319, MAX7320-7327 series of I2C
Port Expanders. Each IO port on these chips has a fixed role of

100
drivers/gpio/gpio-max732x.c
View File

@ -19,6 +19,7 @@
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/i2c.h>
#include <linux/i2c/max732x.h>
#include <linux/of.h>
@ -149,13 +150,14 @@ struct max732x_chip {
uint8_t reg_out[2];
#ifdef CONFIG_GPIO_MAX732X_IRQ
struct mutex irq_lock;
int irq_base;
uint8_t irq_mask;
uint8_t irq_mask_cur;
uint8_t irq_trig_raise;
uint8_t irq_trig_fall;
uint8_t irq_features;
struct irq_domain *irq_domain;
struct mutex irq_lock;
int irq_base;
uint8_t irq_mask;
uint8_t irq_mask_cur;
uint8_t irq_trig_raise;
uint8_t irq_trig_fall;
uint8_t irq_features;
#endif
};
@ -341,21 +343,27 @@ static int max732x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
struct max732x_chip *chip;
chip = container_of(gc, struct max732x_chip, gpio_chip);
return chip->irq_base + off;
if (chip->irq_domain) {
return irq_create_mapping(chip->irq_domain,
chip->irq_base + off);
} else {
return -ENXIO;
}
}
static void max732x_irq_mask(struct irq_data *d)
{
struct max732x_chip *chip = irq_data_get_irq_chip_data(d);
chip->irq_mask_cur &= ~(1 << (d->irq - chip->irq_base));
chip->irq_mask_cur &= ~(1 << d->hwirq);
}
static void max732x_irq_unmask(struct irq_data *d)
{
struct max732x_chip *chip = irq_data_get_irq_chip_data(d);
chip->irq_mask_cur |= 1 << (d->irq - chip->irq_base);
chip->irq_mask_cur |= 1 << d->hwirq;
}
static void max732x_irq_bus_lock(struct irq_data *d)
@ -377,7 +385,7 @@ static void max732x_irq_bus_sync_unlock(struct irq_data *d)
static int max732x_irq_set_type(struct irq_data *d, unsigned int type)
{
struct max732x_chip *chip = irq_data_get_irq_chip_data(d);
uint16_t off = d->irq - chip->irq_base;
uint16_t off = d->hwirq;
uint16_t mask = 1 << off;
if (!(mask & chip->dir_input)) {
@ -458,7 +466,7 @@ static irqreturn_t max732x_irq_handler(int irq, void *devid)
do {
level = __ffs(pending);
handle_nested_irq(level + chip->irq_base);
handle_nested_irq(irq_find_mapping(chip->irq_domain, level));
pending &= ~(1 << level);
} while (pending);
@ -466,6 +474,44 @@ static irqreturn_t max732x_irq_handler(int irq, void *devid)
return IRQ_HANDLED;
}
static int max732x_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct max732x_chip *chip = h->host_data;
if (!(chip->dir_input & (1 << hw))) {
dev_err(&chip->client->dev,
"Attempt to map output line as IRQ line: %lu\n",
hw);
return -EPERM;
}
irq_set_chip_data(virq, chip);
irq_set_chip_and_handler(virq, &max732x_irq_chip,
handle_edge_irq);
irq_set_nested_thread(virq, 1);
#ifdef CONFIG_ARM
/* ARM needs us to explicitly flag the IRQ as valid
* and will set them noprobe when we do so. */
set_irq_flags(virq, IRQF_VALID);
#else
irq_set_noprobe(virq);
#endif
return 0;
}
static struct irq_domain_ops max732x_irq_domain_ops = {
.map = max732x_irq_map,
.xlate = irq_domain_xlate_twocell,
};
static void max732x_irq_teardown(struct max732x_chip *chip)
{
if (chip->client->irq && chip->irq_domain)
irq_domain_remove(chip->irq_domain);
}
static int max732x_irq_setup(struct max732x_chip *chip,
const struct i2c_device_id *id)
{
@ -476,28 +522,17 @@ static int max732x_irq_setup(struct max732x_chip *chip,
if (((pdata && pdata->irq_base) || client->irq)
&& has_irq != INT_NONE) {
int lvl;
if (pdata)
chip->irq_base = pdata->irq_base;
chip->irq_features = has_irq;
mutex_init(&chip->irq_lock);
for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
int irq = lvl + chip->irq_base;
if (!(chip->dir_input & (1 << lvl)))
continue;
irq_set_chip_data(irq, chip);
irq_set_chip_and_handler(irq, &max732x_irq_chip,
handle_edge_irq);
irq_set_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
chip->irq_domain = irq_domain_add_simple(client->dev.of_node,
chip->gpio_chip.ngpio, chip->irq_base,
&max732x_irq_domain_ops, chip);
if (!chip->irq_domain) {
dev_err(&client->dev, "Failed to create IRQ domain\n");
return -ENOMEM;
}
ret = request_threaded_irq(client->irq,
@ -517,15 +552,10 @@ static int max732x_irq_setup(struct max732x_chip *chip,
return 0;
out_failed:
chip->irq_base = 0;
max732x_irq_teardown(chip);
return ret;
}
static void max732x_irq_teardown(struct max732x_chip *chip)
{
if (chip->irq_base)
free_irq(chip->client->irq, chip);
}
#else /* CONFIG_GPIO_MAX732X_IRQ */
static int max732x_irq_setup(struct max732x_chip *chip,
const struct i2c_device_id *id)