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Message-Id: <1421156505-16600-3-git-send-email-semen.protsenko@globallogic.com>
Date: Tue, 13 Jan 2015 15:41:43 +0200
From: Semen Protsenko <semen.protsenko@...ballogic.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>
Cc: Grant Likely <grant.likely@...aro.org>,
Mark Rutland <mark.rutland@....com>,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Marc Zyngier <maz@...terjones.org>,
Grygorii Strashko <grygorii.strashko@...ballogic.com>,
Illia Smyrnov <illia.smyrnov@...ballogic.com>
Subject: [PATCH 2/4] gpio: max732x: Rewrite IRQ code to use irq_domain API
Signed-off-by: Semen Protsenko <semen.protsenko@...ballogic.com>
---
drivers/gpio/Kconfig | 1 +
drivers/gpio/gpio-max732x.c | 100 ++++++++++++++++++++++++++++---------------
2 files changed, 66 insertions(+), 35 deletions(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..d81d441 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -519,6 +519,7 @@ 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
diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
index a642f78..f8f3e80 100644
--- a/drivers/gpio/gpio-max732x.c
+++ b/drivers/gpio/gpio-max732x.c
@@ -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)
--
1.7.9.5
--
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