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-rw-r--r--drivers/gpio/Kconfig6
-rw-r--r--drivers/gpio/gpio-104-idio-16.c112
2 files changed, 116 insertions, 2 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b18bea08ff25..18e1aa05a616 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -496,8 +496,12 @@ menu "Port-mapped I/O GPIO drivers"
config GPIO_104_IDIO_16
tristate "ACCES 104-IDIO-16 GPIO support"
+ select GPIOLIB_IRQCHIP
help
- Enables GPIO support for the ACCES 104-IDIO-16 family.
+ Enables GPIO support for the ACCES 104-IDIO-16 family. The base port
+ address for the device may be set via the idio_16_base module
+ parameter. The interrupt line number for the device may be set via the
+ idio_16_irq module parameter.
config GPIO_F7188X
tristate "F71869, F71869A, F71882FG and F71889F GPIO support"
diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 107cfd7105a8..4e8adee4d8c2 100644
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -11,11 +11,14 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
+#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/io.h>
#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/irqdesc.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
@@ -25,20 +28,27 @@
static unsigned idio_16_base;
module_param(idio_16_base, uint, 0);
MODULE_PARM_DESC(idio_16_base, "ACCES 104-IDIO-16 base address");
+static unsigned idio_16_irq;
+module_param(idio_16_irq, uint, 0);
+MODULE_PARM_DESC(idio_16_irq, "ACCES 104-IDIO-16 interrupt line number");
/**
* struct idio_16_gpio - GPIO device private data structure
* @chip: instance of the gpio_chip
- * @lock: synchronization lock to prevent gpio_set race conditions
+ * @lock: synchronization lock to prevent I/O race conditions
+ * @irq_mask: I/O bits affected by interrupts
* @base: base port address of the GPIO device
* @extent: extent of port address region of the GPIO device
+ * @irq: Interrupt line number
* @out_state: output bits state
*/
struct idio_16_gpio {
struct gpio_chip chip;
spinlock_t lock;
+ unsigned long irq_mask;
unsigned base;
unsigned extent;
+ unsigned irq;
unsigned out_state;
};
@@ -105,6 +115,87 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
spin_unlock_irqrestore(&idio16gpio->lock, flags);
}
+static void idio_16_irq_ack(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct idio_16_gpio *const idio16gpio = to_idio16gpio(chip);
+ unsigned long flags;
+
+ spin_lock_irqsave(&idio16gpio->lock, flags);
+
+ outb(0, idio16gpio->base + 1);
+
+ spin_unlock_irqrestore(&idio16gpio->lock, flags);
+}
+
+static void idio_16_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct idio_16_gpio *const idio16gpio = to_idio16gpio(chip);
+ const unsigned long mask = BIT(irqd_to_hwirq(data));
+ unsigned long flags;
+
+ idio16gpio->irq_mask &= ~mask;
+
+ if (!idio16gpio->irq_mask) {
+ spin_lock_irqsave(&idio16gpio->lock, flags);
+
+ outb(0, idio16gpio->base + 2);
+
+ spin_unlock_irqrestore(&idio16gpio->lock, flags);
+ }
+}
+
+static void idio_16_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct idio_16_gpio *const idio16gpio = to_idio16gpio(chip);
+ const unsigned long mask = BIT(irqd_to_hwirq(data));
+ const unsigned long prev_irq_mask = idio16gpio->irq_mask;
+ unsigned long flags;
+
+ idio16gpio->irq_mask |= mask;
+
+ if (!prev_irq_mask) {
+ spin_lock_irqsave(&idio16gpio->lock, flags);
+
+ outb(0, idio16gpio->base + 1);
+ inb(idio16gpio->base + 2);
+
+ spin_unlock_irqrestore(&idio16gpio->lock, flags);
+ }
+}
+
+static int idio_16_irq_set_type(struct irq_data *data, unsigned flow_type)
+{
+ /* The only valid irq types are none and both-edges */
+ if (flow_type != IRQ_TYPE_NONE &&
+ (flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct irq_chip idio_16_irqchip = {
+ .name = "104-idio-16",
+ .irq_ack = idio_16_irq_ack,
+ .irq_mask = idio_16_irq_mask,
+ .irq_unmask = idio_16_irq_unmask,
+ .irq_set_type = idio_16_irq_set_type
+};
+
+static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
+{
+ struct idio_16_gpio *const idio16gpio = dev_id;
+ struct gpio_chip *const chip = &idio16gpio->chip;
+ int gpio;
+
+ for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
+ generic_handle_irq(irq_find_mapping(chip->irqdomain, gpio));
+
+ return IRQ_HANDLED;
+}
+
static int __init idio_16_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -113,6 +204,7 @@ static int __init idio_16_probe(struct platform_device *pdev)
const unsigned BASE = idio_16_base;
const unsigned EXTENT = 8;
+ const unsigned IRQ = idio_16_irq;
const char *const NAME = dev_name(dev);
idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
@@ -138,6 +230,7 @@ static int __init idio_16_probe(struct platform_device *pdev)
idio16gpio->chip.set = idio_16_gpio_set;
idio16gpio->base = BASE;
idio16gpio->extent = EXTENT;
+ idio16gpio->irq = IRQ;
idio16gpio->out_state = 0xFFFF;
spin_lock_init(&idio16gpio->lock);
@@ -150,8 +243,24 @@ static int __init idio_16_probe(struct platform_device *pdev)
goto err_gpio_register;
}
+ err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
+ handle_edge_irq, IRQ_TYPE_NONE);
+ if (err) {
+ dev_err(dev, "Could not add irqchip (%d)\n", err);
+ goto err_gpiochip_irqchip_add;
+ }
+
+ err = request_irq(IRQ, idio_16_irq_handler, 0, NAME, idio16gpio);
+ if (err) {
+ dev_err(dev, "IRQ handler registering failed (%d)\n", err);
+ goto err_request_irq;
+ }
+
return 0;
+err_request_irq:
+err_gpiochip_irqchip_add:
+ gpiochip_remove(&idio16gpio->chip);
err_gpio_register:
release_region(BASE, EXTENT);
err_lock_io_port:
@@ -162,6 +271,7 @@ static int idio_16_remove(struct platform_device *pdev)
{
struct idio_16_gpio *const idio16gpio = platform_get_drvdata(pdev);
+ free_irq(idio16gpio->irq, idio16gpio);
gpiochip_remove(&idio16gpio->chip);
release_region(idio16gpio->base, idio16gpio->extent);