diff options
Diffstat (limited to 'drivers/gpio/gpio-104-idio-16.c')
| -rw-r--r-- | drivers/gpio/gpio-104-idio-16.c | 112 |
1 files changed, 111 insertions, 1 deletions
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); |