@@ -519,6 +519,7 @@ config GPIO_PCA953X
config GPIO_PCA953X_IRQ
bool "Interrupt controller support for PCA953x"
depends on GPIO_PCA953X=y
+ select GPIOLIB_IRQCHIP
help
Say yes here to enable the pca953x to be used as an interrupt
controller. It requires the driver to be built in the kernel.
@@ -15,8 +15,6 @@
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
#include <linux/i2c.h>
#include <linux/platform_data/pca953x.h>
#include <linux/slab.h>
@@ -91,7 +89,6 @@ struct pca953x_chip {
u8 irq_stat[MAX_BANK];
u8 irq_trig_raise[MAX_BANK];
u8 irq_trig_fall[MAX_BANK];
- struct irq_domain *domain;
#endif
struct i2c_client *client;
@@ -100,6 +97,11 @@ struct pca953x_chip {
int chip_type;
};
+static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
+{
+ return container_of(gc, struct pca953x_chip, gpio_chip);
+}
+
static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
int off)
{
@@ -202,12 +204,10 @@ static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
- struct pca953x_chip *chip;
+ struct pca953x_chip *chip = to_pca(gc);
u8 reg_val;
int ret, offset = 0;
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
mutex_lock(&chip->i2c_lock);
reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
@@ -233,12 +233,10 @@ exit:
static int pca953x_gpio_direction_output(struct gpio_chip *gc,
unsigned off, int val)
{
- struct pca953x_chip *chip;
+ struct pca953x_chip *chip = to_pca(gc);
u8 reg_val;
int ret, offset = 0;
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
mutex_lock(&chip->i2c_lock);
/* set output level */
if (val)
@@ -285,12 +283,10 @@ exit:
static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
- struct pca953x_chip *chip;
+ struct pca953x_chip *chip = to_pca(gc);
u32 reg_val;
int ret, offset = 0;
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
mutex_lock(&chip->i2c_lock);
switch (chip->chip_type) {
case PCA953X_TYPE:
@@ -315,12 +311,10 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
{
- struct pca953x_chip *chip;
+ struct pca953x_chip *chip = to_pca(gc);
u8 reg_val;
int ret, offset = 0;
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
mutex_lock(&chip->i2c_lock);
if (val)
reg_val = chip->reg_output[off / BANK_SZ]
@@ -367,38 +361,34 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
}
#ifdef CONFIG_GPIO_PCA953X_IRQ
-static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
-{
- struct pca953x_chip *chip;
-
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
- return irq_create_mapping(chip->domain, off);
-}
-
static void pca953x_irq_mask(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = to_pca(gc);
chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
}
static void pca953x_irq_unmask(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = to_pca(gc);
chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
}
static void pca953x_irq_bus_lock(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = to_pca(gc);
mutex_lock(&chip->irq_lock);
}
static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = to_pca(gc);
u8 new_irqs;
int level, i;
@@ -420,7 +410,8 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = to_pca(gc);
int bank_nb = d->hwirq / BANK_SZ;
u8 mask = 1 << (d->hwirq % BANK_SZ);
@@ -512,7 +503,7 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
for (i = 0; i < NBANK(chip); i++) {
while (pending[i]) {
level = __ffs(pending[i]);
- handle_nested_irq(irq_find_mapping(chip->domain,
+ handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
level + (BANK_SZ * i)));
pending[i] &= ~(1 << level);
nhandled++;
@@ -522,27 +513,6 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
}
-static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hwirq)
-{
- irq_clear_status_flags(irq, IRQ_NOREQUEST);
- irq_set_chip_data(irq, d->host_data);
- irq_set_chip(irq, &pca953x_irq_chip);
- irq_set_nested_thread(irq, true);
-#ifdef CONFIG_ARM
- set_irq_flags(irq, IRQF_VALID);
-#else
- irq_set_noprobe(irq);
-#endif
-
- return 0;
-}
-
-static const struct irq_domain_ops pca953x_irq_simple_ops = {
- .map = pca953x_gpio_irq_map,
- .xlate = irq_domain_xlate_twocell,
-};
-
static int pca953x_irq_setup(struct pca953x_chip *chip,
const struct i2c_device_id *id,
int irq_base)
@@ -574,14 +544,6 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
chip->irq_stat[i] &= chip->reg_direction[i];
mutex_init(&chip->irq_lock);
- chip->domain = irq_domain_add_simple(client->dev.of_node,
- chip->gpio_chip.ngpio,
- irq_base,
- &pca953x_irq_simple_ops,
- chip);
- if (!chip->domain)
- return -ENODEV;
-
ret = devm_request_threaded_irq(&client->dev,
client->irq,
NULL,
@@ -595,7 +557,16 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
return ret;
}
- chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
+ ret = gpiochip_irqchip_add(&chip->gpio_chip,
+ &pca953x_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;
+ }
}
return 0;
@@ -759,11 +730,11 @@ static int pca953x_probe(struct i2c_client *client,
if (ret)
return ret;
- ret = pca953x_irq_setup(chip, id, irq_base);
+ ret = gpiochip_add(&chip->gpio_chip);
if (ret)
return ret;
- ret = gpiochip_add(&chip->gpio_chip);
+ ret = pca953x_irq_setup(chip, id, irq_base);
if (ret)
return ret;
This switches the PCA953x driver over to using the gpiolib irqchip helpers to handle the threaded interrups cascaded off this GPIO chip. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> --- PCA953x users: please! help testing this. It is just compile-tested but I'm sure this or something close to it will work just fine. The patch depends on the GPIO tree devel branch, so I have set up a branch you can test: git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git#pca953-irqchip-helpers The branch is on top of Toby's changes. Please help to provide Tested-by tags. --- drivers/gpio/Kconfig | 1 + drivers/gpio/gpio-pca953x.c | 93 ++++++++++++++++----------------------------- 2 files changed, 33 insertions(+), 61 deletions(-)