diff options
| -rw-r--r-- | drivers/gpio/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/gpio/gpio-mockup.c | 79 |
2 files changed, 81 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index d4cec615a71e..05043071fc98 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -298,6 +298,8 @@ config GPIO_MOCKUP tristate "GPIO Testing Driver" depends on GPIOLIB && SYSFS select GPIO_SYSFS + select GPIOLIB_IRQCHIP + select IRQ_WORK help This enables GPIO Testing driver, which provides a way to test GPIO subsystem through sysfs(or char device) and debugfs. GPIO_SYSFS diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c index 0ce9acc3550e..03beadb20dee 100644 --- a/drivers/gpio/gpio-mockup.c +++ b/drivers/gpio/gpio-mockup.c @@ -16,6 +16,9 @@ #include <linux/gpio/driver.h> #include <linux/platform_device.h> #include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irq_work.h> #define GPIO_MOCKUP_NAME "gpio-mockup" #define GPIO_MOCKUP_MAX_GC 10 @@ -35,9 +38,15 @@ struct gpio_mockup_line_status { bool value; }; +struct gpio_mockup_irq_context { + struct irq_work work; + int irq; +}; + struct gpio_mockup_chip { struct gpio_chip gc; struct gpio_mockup_line_status *lines; + struct gpio_mockup_irq_context irq_ctx; }; static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1]; @@ -115,6 +124,57 @@ static int gpio_mockup_name_lines(struct device *dev, return 0; } +static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset) +{ + return chip->irq_base + offset; +} + +/* + * While we should generally support irqmask and irqunmask, this driver is + * for testing purposes only so we don't care. + */ +static void gpio_mockup_irqmask(struct irq_data *d) { } +static void gpio_mockup_irqunmask(struct irq_data *d) { } + +static struct irq_chip gpio_mockup_irqchip = { + .name = GPIO_MOCKUP_NAME, + .irq_mask = gpio_mockup_irqmask, + .irq_unmask = gpio_mockup_irqunmask, +}; + +static void gpio_mockup_handle_irq(struct irq_work *work) +{ + struct gpio_mockup_irq_context *irq_ctx; + + irq_ctx = container_of(work, struct gpio_mockup_irq_context, work); + handle_simple_irq(irq_to_desc(irq_ctx->irq)); +} + +static int gpio_mockup_irqchip_setup(struct device *dev, + struct gpio_mockup_chip *chip) +{ + struct gpio_chip *gc = &chip->gc; + int irq_base, i; + + irq_base = irq_alloc_descs(-1, 0, gc->ngpio, 0); + if (irq_base < 0) + return irq_base; + + gc->irq_base = irq_base; + gc->irqchip = &gpio_mockup_irqchip; + + for (i = 0; i < gc->ngpio; i++) { + irq_set_chip(irq_base + i, gc->irqchip); + irq_set_handler(irq_base + i, &handle_simple_irq); + irq_modify_status(irq_base + i, + IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); + } + + init_irq_work(&chip->irq_ctx.work, gpio_mockup_handle_irq); + + return 0; +} + static int gpio_mockup_add(struct device *dev, struct gpio_mockup_chip *chip, const char *name, int base, int ngpio) @@ -132,6 +192,7 @@ static int gpio_mockup_add(struct device *dev, gc->direction_output = gpio_mockup_dirout; gc->direction_input = gpio_mockup_dirin; gc->get_direction = gpio_mockup_get_direction; + gc->to_irq = gpio_mockup_to_irq; chip->lines = devm_kzalloc(dev, sizeof(*chip->lines) * gc->ngpio, GFP_KERNEL); @@ -144,6 +205,10 @@ static int gpio_mockup_add(struct device *dev, return ret; } + ret = gpio_mockup_irqchip_setup(dev, chip); + if (ret) + return ret; + return devm_gpiochip_add_data(dev, &chip->gc, chip); } @@ -200,11 +265,25 @@ static int gpio_mockup_probe(struct platform_device *pdev) return 0; } +static int gpio_mockup_remove(struct platform_device *pdev) +{ + struct gpio_mockup_chip *chips; + int i; + + chips = platform_get_drvdata(pdev); + + for (i = 0; i < gpio_mockup_params_nr >> 1; i++) + irq_free_descs(chips[i].gc.irq_base, chips[i].gc.ngpio); + + return 0; +} + static struct platform_driver gpio_mockup_driver = { .driver = { .name = GPIO_MOCKUP_NAME, }, .probe = gpio_mockup_probe, + .remove = gpio_mockup_remove, }; static struct platform_device *pdev; |