diff options
| -rw-r--r-- | drivers/mfd/wm831x-core.c | 9 | ||||
| -rw-r--r-- | drivers/mfd/wm831x-irq.c | 209 | ||||
| -rw-r--r-- | include/linux/mfd/wm831x/core.h | 40 | ||||
| -rw-r--r-- | include/linux/mfd/wm831x/pdata.h | 1 |
4 files changed, 122 insertions, 137 deletions
diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c index 163029f..223a90c 100644 --- a/drivers/mfd/wm831x-core.c +++ b/drivers/mfd/wm831x-core.c @@ -1504,19 +1504,19 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) case WM8310: ret = mfd_add_devices(wm831x->dev, -1, wm8310_devs, ARRAY_SIZE(wm8310_devs), - NULL, 0); + NULL, wm831x->irq_base); break; case WM8311: ret = mfd_add_devices(wm831x->dev, -1, wm8311_devs, ARRAY_SIZE(wm8311_devs), - NULL, 0); + NULL, wm831x->irq_base); break; case WM8312: ret = mfd_add_devices(wm831x->dev, -1, wm8312_devs, ARRAY_SIZE(wm8312_devs), - NULL, 0); + NULL, wm831x->irq_base); break; case WM8320: @@ -1538,7 +1538,8 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) if (pdata && pdata->backlight) { /* Treat errors as non-critical */ ret = mfd_add_devices(wm831x->dev, -1, backlight_devs, - ARRAY_SIZE(backlight_devs), NULL, 0); + ARRAY_SIZE(backlight_devs), NULL, + wm831x->irq_base); if (ret < 0) dev_err(wm831x->dev, "Failed to add backlight: %d\n", ret); diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c index ac056ea..30132769 100644 --- a/drivers/mfd/wm831x-irq.c +++ b/drivers/mfd/wm831x-irq.c @@ -15,6 +15,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/i2c.h> +#include <linux/irq.h> #include <linux/mfd/core.h> #include <linux/interrupt.h> @@ -339,110 +340,71 @@ static inline int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data) return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg; } -static void __wm831x_enable_irq(struct wm831x *wm831x, int irq) +static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x, + int irq) { - struct wm831x_irq_data *irq_data = &wm831x_irqs[irq]; - - wm831x->irq_masks[irq_data->reg - 1] &= ~irq_data->mask; - wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data), - wm831x->irq_masks[irq_data->reg - 1]); + return &wm831x_irqs[irq - wm831x->irq_base]; } -void wm831x_enable_irq(struct wm831x *wm831x, int irq) +static void wm831x_irq_lock(unsigned int irq) { - mutex_lock(&wm831x->irq_lock); - __wm831x_enable_irq(wm831x, irq); - mutex_unlock(&wm831x->irq_lock); -} -EXPORT_SYMBOL_GPL(wm831x_enable_irq); + struct wm831x *wm831x = get_irq_chip_data(irq); -static void __wm831x_disable_irq(struct wm831x *wm831x, int irq) -{ - struct wm831x_irq_data *irq_data = &wm831x_irqs[irq]; - - wm831x->irq_masks[irq_data->reg - 1] |= irq_data->mask; - wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data), - wm831x->irq_masks[irq_data->reg - 1]); -} - -void wm831x_disable_irq(struct wm831x *wm831x, int irq) -{ mutex_lock(&wm831x->irq_lock); - __wm831x_disable_irq(wm831x, irq); - mutex_unlock(&wm831x->irq_lock); } -EXPORT_SYMBOL_GPL(wm831x_disable_irq); -int wm831x_request_irq(struct wm831x *wm831x, - unsigned int irq, irq_handler_t handler, - unsigned long flags, const char *name, - void *dev) +static void wm831x_irq_sync_unlock(unsigned int irq) { - int ret = 0; - - if (irq < 0 || irq >= WM831X_NUM_IRQS) - return -EINVAL; - - mutex_lock(&wm831x->irq_lock); - - if (wm831x_irqs[irq].handler) { - dev_err(wm831x->dev, "Already have handler for IRQ %d\n", irq); - ret = -EINVAL; - goto out; + struct wm831x *wm831x = get_irq_chip_data(irq); + int i; + + for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) { + /* If there's been a change in the mask write it back + * to the hardware. */ + if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) { + wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i]; + wm831x_reg_write(wm831x, + WM831X_INTERRUPT_STATUS_1_MASK + i, + wm831x->irq_masks_cur[i]); + } } - wm831x_irqs[irq].handler = handler; - wm831x_irqs[irq].handler_data = dev; - - __wm831x_enable_irq(wm831x, irq); - -out: mutex_unlock(&wm831x->irq_lock); - - return ret; } -EXPORT_SYMBOL_GPL(wm831x_request_irq); -void wm831x_free_irq(struct wm831x *wm831x, unsigned int irq, void *data) +static void wm831x_irq_unmask(unsigned int irq) { - if (irq < 0 || irq >= WM831X_NUM_IRQS) - return; - - mutex_lock(&wm831x->irq_lock); + struct wm831x *wm831x = get_irq_chip_data(irq); + struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, irq); - wm831x_irqs[irq].handler = NULL; - wm831x_irqs[irq].handler_data = NULL; - - __wm831x_disable_irq(wm831x, irq); - - mutex_unlock(&wm831x->irq_lock); + wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; } -EXPORT_SYMBOL_GPL(wm831x_free_irq); - -static void wm831x_handle_irq(struct wm831x *wm831x, int irq, int status) +static void wm831x_irq_mask(unsigned int irq) { - struct wm831x_irq_data *irq_data = &wm831x_irqs[irq]; - - if (irq_data->handler) { - irq_data->handler(irq, irq_data->handler_data); - wm831x_reg_write(wm831x, irq_data_to_status_reg(irq_data), - irq_data->mask); - } else { - dev_err(wm831x->dev, "Unhandled IRQ %d, masking\n", irq); - __wm831x_disable_irq(wm831x, irq); - } + struct wm831x *wm831x = get_irq_chip_data(irq); + struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, irq); + + wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; } -/* Main interrupt handling occurs in a workqueue since we need - * interrupts enabled to interact with the chip. */ -static void wm831x_irq_worker(struct work_struct *work) +static struct irq_chip wm831x_irq_chip = { + .name = "wm831x", + .bus_lock = wm831x_irq_lock, + .bus_sync_unlock = wm831x_irq_sync_unlock, + .mask = wm831x_irq_mask, + .unmask = wm831x_irq_unmask, +}; + +/* The processing of the primary interrupt occurs in a thread so that + * we can interact with the device over I2C or SPI. */ +static irqreturn_t wm831x_irq_thread(int irq, void *data) { - struct wm831x *wm831x = container_of(work, struct wm831x, irq_work); + struct wm831x *wm831x = data; unsigned int i; int primary; - int status_regs[5]; - int read[5] = { 0 }; + int status_regs[WM831X_NUM_IRQ_REGS] = { 0 }; + int read[WM831X_NUM_IRQ_REGS] = { 0 }; int *status; primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS); @@ -452,8 +414,6 @@ static void wm831x_irq_worker(struct work_struct *work) goto out; } - mutex_lock(&wm831x->irq_lock); - for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) { int offset = wm831x_irqs[i].reg - 1; @@ -471,41 +431,34 @@ static void wm831x_irq_worker(struct work_struct *work) dev_err(wm831x->dev, "Failed to read IRQ status: %d\n", *status); - goto out_lock; + goto out; } - /* Mask out the disabled IRQs */ - *status &= ~wm831x->irq_masks[offset]; read[offset] = 1; } - if (*status & wm831x_irqs[i].mask) - wm831x_handle_irq(wm831x, i, *status); + /* Report it if it isn't masked, or forget the status. */ + if ((*status & ~wm831x->irq_masks_cur[offset]) + & wm831x_irqs[i].mask) + handle_nested_irq(wm831x->irq_base + i); + else + *status &= ~wm831x_irqs[i].mask; } -out_lock: - mutex_unlock(&wm831x->irq_lock); out: - enable_irq(wm831x->irq); -} - - -static irqreturn_t wm831x_cpu_irq(int irq, void *data) -{ - struct wm831x *wm831x = data; - - /* Shut the interrupt to the CPU up and schedule the actual - * handler; we can't check that the IRQ is asserted. */ - disable_irq_nosync(irq); - - queue_work(wm831x->irq_wq, &wm831x->irq_work); + for (i = 0; i < ARRAY_SIZE(status_regs); i++) { + if (status_regs[i]) + wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1 + i, + status_regs[i]); + } return IRQ_HANDLED; } int wm831x_irq_init(struct wm831x *wm831x, int irq) { - int i, ret; + struct wm831x_pdata *pdata = wm831x->dev->platform_data; + int i, cur_irq, ret; mutex_init(&wm831x->irq_lock); @@ -515,41 +468,53 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq) return 0; } - - wm831x->irq_wq = create_singlethread_workqueue("wm831x-irq"); - if (!wm831x->irq_wq) { - dev_err(wm831x->dev, "Failed to allocate IRQ worker\n"); - return -ESRCH; + if (!pdata || !pdata->irq_base) { + dev_err(wm831x->dev, + "No interrupt base specified, no interrupts\n"); + return 0; } wm831x->irq = irq; - INIT_WORK(&wm831x->irq_work, wm831x_irq_worker); + wm831x->irq_base = pdata->irq_base; /* Mask the individual interrupt sources */ - for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks); i++) { - wm831x->irq_masks[i] = 0xffff; + for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) { + wm831x->irq_masks_cur[i] = 0xffff; + wm831x->irq_masks_cache[i] = 0xffff; wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i, 0xffff); } - /* Enable top level interrupts, we mask at secondary level */ - wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0); + /* Register them with genirq */ + for (cur_irq = wm831x->irq_base; + cur_irq < ARRAY_SIZE(wm831x_irqs) + wm831x->irq_base; + cur_irq++) { + set_irq_chip_data(cur_irq, wm831x); + set_irq_chip_and_handler(cur_irq, &wm831x_irq_chip, + handle_edge_irq); + set_irq_nested_thread(cur_irq, 1); + + /* ARM needs us to explicitly flag the IRQ as valid + * and will set them noprobe when we do so. */ +#ifdef CONFIG_ARM + set_irq_flags(cur_irq, IRQF_VALID); +#else + set_irq_noprobe(cur_irq); +#endif + } - /* We're good to go. We set IRQF_SHARED since there's a - * chance the driver will interoperate with another driver but - * the need to disable the IRQ while handing via I2C/SPI means - * that this may break and performance will be impacted. If - * this does happen it's a hardware design issue and the only - * other alternative would be polling. - */ - ret = request_irq(irq, wm831x_cpu_irq, IRQF_TRIGGER_LOW | IRQF_SHARED, - "wm831x", wm831x); + ret = request_threaded_irq(irq, NULL, wm831x_irq_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "wm831x", wm831x); if (ret != 0) { dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n", irq, ret); return ret; } + /* Enable top level interrupts, we mask at secondary level */ + wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0); + return 0; } diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h index d01d293..5184b79 100644 --- a/include/linux/mfd/wm831x/core.h +++ b/include/linux/mfd/wm831x/core.h @@ -16,7 +16,6 @@ #define __MFD_WM831X_CORE_H__ #include <linux/interrupt.h> -#include <linux/workqueue.h> /* * Register values. @@ -236,6 +235,8 @@ struct regulator_dev; +#define WM831X_NUM_IRQ_REGS 5 + struct wm831x { struct mutex io_lock; @@ -249,10 +250,9 @@ struct wm831x { int irq; /* Our chip IRQ */ struct mutex irq_lock; - struct workqueue_struct *irq_wq; - struct work_struct irq_work; unsigned int irq_base; - int irq_masks[5]; + int irq_masks_cur[WM831X_NUM_IRQ_REGS]; /* Currently active value */ + int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */ int num_gpio; @@ -281,12 +281,30 @@ int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg, int wm831x_irq_init(struct wm831x *wm831x, int irq); void wm831x_irq_exit(struct wm831x *wm831x); -int __must_check wm831x_request_irq(struct wm831x *wm831x, - unsigned int irq, irq_handler_t handler, - unsigned long flags, const char *name, - void *dev); -void wm831x_free_irq(struct wm831x *wm831x, unsigned int, void *); -void wm831x_disable_irq(struct wm831x *wm831x, int irq); -void wm831x_enable_irq(struct wm831x *wm831x, int irq); +static inline int __must_check wm831x_request_irq(struct wm831x *wm831x, + unsigned int irq, + irq_handler_t handler, + unsigned long flags, + const char *name, + void *dev) +{ + return request_threaded_irq(irq, NULL, handler, flags, name, dev); +} + +static inline void wm831x_free_irq(struct wm831x *wm831x, + unsigned int irq, void *dev) +{ + free_irq(irq, dev); +} + +static inline void wm831x_disable_irq(struct wm831x *wm831x, int irq) +{ + disable_irq(irq); +} + +static inline void wm831x_enable_irq(struct wm831x *wm831x, int irq) +{ + enable_irq(irq); +} #endif diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h index 90d8202..415c228 100644 --- a/include/linux/mfd/wm831x/pdata.h +++ b/include/linux/mfd/wm831x/pdata.h @@ -91,6 +91,7 @@ struct wm831x_pdata { /** Called after subdevices are set up */ int (*post_init)(struct wm831x *wm831x); + int irq_base; int gpio_base; struct wm831x_backlight_pdata *backlight; struct wm831x_backup_pdata *backup; |
