diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-21 18:58:28 +0400 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-02-19 03:15:43 +0400 |
commit | a3364409c4af8bae42d04def48dc11409787e503 (patch) | |
tree | 317d68920998bc5823d2879a49d49f27a8aed279 | |
parent | cf4abfcc0df2985ff6061f74e63b8353f2a1d0bc (diff) | |
download | linux-a3364409c4af8bae42d04def48dc11409787e503.tar.xz |
MFD: ucb1x00: convert to use genirq
Convert the ucb1x00 driver to use genirq's interrupt services, rather
than its own private implementation. This allows a wider range of
drivers to use the GPIO interrupts (such as the gpio_keys driver)
without being aware of the UCB1x00's private IRQ system.
This prevents the UCB1x00 core driver from being built as a module,
so adjust the configuration to add that restriction.
Acked-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r-- | drivers/mfd/Kconfig | 5 | ||||
-rw-r--r-- | drivers/mfd/ucb1x00-core.c | 247 | ||||
-rw-r--r-- | drivers/mfd/ucb1x00-ts.c | 37 | ||||
-rw-r--r-- | include/linux/mfd/ucb1x00.h | 22 |
4 files changed, 132 insertions, 179 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index cd13e9f2f5e6..28a301b28579 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -847,8 +847,9 @@ config MCP_SA11X0 # Chip drivers config MCP_UCB1200 - tristate "Support for UCB1200 / UCB1300" - depends on MCP + bool "Support for UCB1200 / UCB1300" + depends on MCP_SA11X0 + select MCP config MCP_UCB1200_TS tristate "Touchscreen interface support" diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c index 6fab82557543..400604d38780 100644 --- a/drivers/mfd/ucb1x00-core.c +++ b/drivers/mfd/ucb1x00-core.c @@ -23,6 +23,7 @@ #include <linux/init.h> #include <linux/errno.h> #include <linux/interrupt.h> +#include <linux/irq.h> #include <linux/device.h> #include <linux/mutex.h> #include <linux/mfd/ucb1x00.h> @@ -178,6 +179,13 @@ static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset return 0; } +static int ucb1x00_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); + + return ucb->irq_base > 0 ? ucb->irq_base + offset : -ENXIO; +} + /* * UCB1300 data sheet says we must: * 1. enable ADC => 5us (including reference startup time) @@ -274,10 +282,9 @@ void ucb1x00_adc_disable(struct ucb1x00 *ucb) * SIBCLK to talk to the chip. We leave the clock running until * we have finished processing all interrupts from the chip. */ -static irqreturn_t ucb1x00_irq(int irqnr, void *devid) +static void ucb1x00_irq(unsigned int irq, struct irq_desc *desc) { - struct ucb1x00 *ucb = devid; - struct ucb1x00_irq *irq; + struct ucb1x00 *ucb = irq_desc_get_handler_data(desc); unsigned int isr, i; ucb1x00_enable(ucb); @@ -285,157 +292,84 @@ static irqreturn_t ucb1x00_irq(int irqnr, void *devid) ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr); ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); - for (i = 0, irq = ucb->irq_handler; i < 16 && isr; i++, isr >>= 1, irq++) - if (isr & 1 && irq->fn) - irq->fn(i, irq->devid); + for (i = 0; i < 16 && isr; i++, isr >>= 1, irq++) + if (isr & 1) + generic_handle_irq(ucb->irq_base + i); ucb1x00_disable(ucb); - - return IRQ_HANDLED; } -/** - * ucb1x00_hook_irq - hook a UCB1x00 interrupt - * @ucb: UCB1x00 structure describing chip - * @idx: interrupt index - * @fn: function to call when interrupt is triggered - * @devid: device id to pass to interrupt handler - * - * Hook the specified interrupt. You can only register one handler - * for each interrupt source. The interrupt source is not enabled - * by this function; use ucb1x00_enable_irq instead. - * - * Interrupt handlers will be called with other interrupts enabled. - * - * Returns zero on success, or one of the following errors: - * -EINVAL if the interrupt index is invalid - * -EBUSY if the interrupt has already been hooked - */ -int ucb1x00_hook_irq(struct ucb1x00 *ucb, unsigned int idx, void (*fn)(int, void *), void *devid) +static void ucb1x00_irq_update(struct ucb1x00 *ucb, unsigned mask) { - struct ucb1x00_irq *irq; - int ret = -EINVAL; - - if (idx < 16) { - irq = ucb->irq_handler + idx; - ret = -EBUSY; - - spin_lock_irq(&ucb->lock); - if (irq->fn == NULL) { - irq->devid = devid; - irq->fn = fn; - ret = 0; - } - spin_unlock_irq(&ucb->lock); - } - return ret; + ucb1x00_enable(ucb); + if (ucb->irq_ris_enbl & mask) + ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl & + ucb->irq_mask); + if (ucb->irq_fal_enbl & mask) + ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl & + ucb->irq_mask); + ucb1x00_disable(ucb); } -/** - * ucb1x00_enable_irq - enable an UCB1x00 interrupt source - * @ucb: UCB1x00 structure describing chip - * @idx: interrupt index - * @edges: interrupt edges to enable - * - * Enable the specified interrupt to trigger on %UCB_RISING, - * %UCB_FALLING or both edges. The interrupt should have been - * hooked by ucb1x00_hook_irq. - */ -void ucb1x00_enable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) +static void ucb1x00_irq_noop(struct irq_data *data) { - unsigned long flags; - - if (idx < 16) { - spin_lock_irqsave(&ucb->lock, flags); - - ucb1x00_enable(ucb); - if (edges & UCB_RISING) { - ucb->irq_ris_enbl |= 1 << idx; - ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); - } - if (edges & UCB_FALLING) { - ucb->irq_fal_enbl |= 1 << idx; - ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); - } - ucb1x00_disable(ucb); - spin_unlock_irqrestore(&ucb->lock, flags); - } } -/** - * ucb1x00_disable_irq - disable an UCB1x00 interrupt source - * @ucb: UCB1x00 structure describing chip - * @edges: interrupt edges to disable - * - * Disable the specified interrupt triggering on the specified - * (%UCB_RISING, %UCB_FALLING or both) edges. - */ -void ucb1x00_disable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) +static void ucb1x00_irq_mask(struct irq_data *data) { - unsigned long flags; + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + unsigned mask = 1 << (data->irq - ucb->irq_base); - if (idx < 16) { - spin_lock_irqsave(&ucb->lock, flags); - - ucb1x00_enable(ucb); - if (edges & UCB_RISING) { - ucb->irq_ris_enbl &= ~(1 << idx); - ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); - } - if (edges & UCB_FALLING) { - ucb->irq_fal_enbl &= ~(1 << idx); - ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); - } - ucb1x00_disable(ucb); - spin_unlock_irqrestore(&ucb->lock, flags); - } + raw_spin_lock(&ucb->irq_lock); + ucb->irq_mask &= ~mask; + ucb1x00_irq_update(ucb, mask); + raw_spin_unlock(&ucb->irq_lock); } -/** - * ucb1x00_free_irq - disable and free the specified UCB1x00 interrupt - * @ucb: UCB1x00 structure describing chip - * @idx: interrupt index - * @devid: device id. - * - * Disable the interrupt source and remove the handler. devid must - * match the devid passed when hooking the interrupt. - * - * Returns zero on success, or one of the following errors: - * -EINVAL if the interrupt index is invalid - * -ENOENT if devid does not match - */ -int ucb1x00_free_irq(struct ucb1x00 *ucb, unsigned int idx, void *devid) +static void ucb1x00_irq_unmask(struct irq_data *data) { - struct ucb1x00_irq *irq; - int ret; + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + unsigned mask = 1 << (data->irq - ucb->irq_base); - if (idx >= 16) - goto bad; - - irq = ucb->irq_handler + idx; - ret = -ENOENT; + raw_spin_lock(&ucb->irq_lock); + ucb->irq_mask |= mask; + ucb1x00_irq_update(ucb, mask); + raw_spin_unlock(&ucb->irq_lock); +} - spin_lock_irq(&ucb->lock); - if (irq->devid == devid) { - ucb->irq_ris_enbl &= ~(1 << idx); - ucb->irq_fal_enbl &= ~(1 << idx); +static int ucb1x00_irq_set_type(struct irq_data *data, unsigned int type) +{ + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + unsigned mask = 1 << (data->irq - ucb->irq_base); - ucb1x00_enable(ucb); - ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); - ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); - ucb1x00_disable(ucb); + raw_spin_lock(&ucb->irq_lock); + if (type & IRQ_TYPE_EDGE_RISING) + ucb->irq_ris_enbl |= mask; + else + ucb->irq_ris_enbl &= ~mask; - irq->fn = NULL; - irq->devid = NULL; - ret = 0; + if (type & IRQ_TYPE_EDGE_FALLING) + ucb->irq_fal_enbl |= mask; + else + ucb->irq_fal_enbl &= ~mask; + if (ucb->irq_mask & mask) { + ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl & + ucb->irq_mask); + ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl & + ucb->irq_mask); } - spin_unlock_irq(&ucb->lock); - return ret; + raw_spin_unlock(&ucb->irq_lock); -bad: - printk(KERN_ERR "Freeing bad UCB1x00 irq %d\n", idx); - return -EINVAL; + return 0; } +static struct irq_chip ucb1x00_irqchip = { + .name = "ucb1x00", + .irq_ack = ucb1x00_irq_noop, + .irq_mask = ucb1x00_irq_mask, + .irq_unmask = ucb1x00_irq_unmask, + .irq_set_type = ucb1x00_irq_set_type, +}; + static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv) { struct ucb1x00_dev *dev; @@ -545,9 +479,8 @@ static int ucb1x00_probe(struct mcp *mcp) struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data; struct ucb1x00_driver *drv; struct ucb1x00 *ucb; - unsigned int id; + unsigned id, i, irq_base; int ret = -ENODEV; - int temp; /* Tell the platform to deassert the UCB1x00 reset */ if (pdata && pdata->reset) @@ -572,7 +505,7 @@ static int ucb1x00_probe(struct mcp *mcp) ucb->dev.parent = &mcp->attached_device; dev_set_name(&ucb->dev, "ucb1x00"); - spin_lock_init(&ucb->lock); + raw_spin_lock_init(&ucb->irq_lock); spin_lock_init(&ucb->io_lock); mutex_init(&ucb->adc_mutex); @@ -593,6 +526,26 @@ static int ucb1x00_probe(struct mcp *mcp) } ucb->gpio.base = -1; + irq_base = pdata ? pdata->irq_base : 0; + ucb->irq_base = irq_alloc_descs(-1, irq_base, 16, -1); + if (ucb->irq_base < 0) { + dev_err(&ucb->dev, "unable to allocate 16 irqs: %d\n", + ucb->irq_base); + goto err_irq_alloc; + } + + for (i = 0; i < 16; i++) { + unsigned irq = ucb->irq_base + i; + + irq_set_chip_and_handler(irq, &ucb1x00_irqchip, handle_edge_irq); + irq_set_chip_data(irq, ucb); + set_irq_flags(irq, IRQF_VALID | IRQ_NOREQUEST); + } + + irq_set_irq_type(ucb->irq, IRQ_TYPE_EDGE_RISING); + irq_set_handler_data(ucb->irq, ucb); + irq_set_chained_handler(ucb->irq, ucb1x00_irq); + if (pdata && pdata->gpio_base) { ucb->gpio.label = dev_name(&ucb->dev); ucb->gpio.dev = &ucb->dev; @@ -603,20 +556,13 @@ static int ucb1x00_probe(struct mcp *mcp) ucb->gpio.get = ucb1x00_gpio_get; ucb->gpio.direction_input = ucb1x00_gpio_direction_input; ucb->gpio.direction_output = ucb1x00_gpio_direction_output; + ucb->gpio.to_irq = ucb1x00_to_irq; ret = gpiochip_add(&ucb->gpio); if (ret) goto err_gpio_add; } else dev_info(&ucb->dev, "gpio_base not set so no gpiolib support"); - ret = request_irq(ucb->irq, ucb1x00_irq, IRQF_TRIGGER_RISING, - "UCB1x00", ucb); - if (ret) { - dev_err(&ucb->dev, "ucb1x00: unable to grab irq%d: %d\n", - ucb->irq, ret); - goto err_irq; - } - mcp_set_drvdata(mcp, ucb); INIT_LIST_HEAD(&ucb->devs); @@ -629,10 +575,11 @@ static int ucb1x00_probe(struct mcp *mcp) return ret; - err_irq: - if (ucb->gpio.base != -1) - temp = gpiochip_remove(&ucb->gpio); err_gpio_add: + irq_set_chained_handler(ucb->irq, NULL); + err_irq_alloc: + if (ucb->irq_base > 0) + irq_free_descs(ucb->irq_base, 16); err_no_irq: device_del(&ucb->dev); err_dev_add: @@ -664,7 +611,8 @@ static void ucb1x00_remove(struct mcp *mcp) dev_err(&ucb->dev, "Can't remove gpio chip: %d\n", ret); } - free_irq(ucb->irq, ucb); + irq_set_chained_handler(ucb->irq, NULL); + irq_free_descs(ucb->irq_base, 16); device_unregister(&ucb->dev); if (pdata && pdata->reset) @@ -772,11 +720,6 @@ EXPORT_SYMBOL(ucb1x00_adc_enable); EXPORT_SYMBOL(ucb1x00_adc_read); EXPORT_SYMBOL(ucb1x00_adc_disable); -EXPORT_SYMBOL(ucb1x00_hook_irq); -EXPORT_SYMBOL(ucb1x00_free_irq); -EXPORT_SYMBOL(ucb1x00_enable_irq); -EXPORT_SYMBOL(ucb1x00_disable_irq); - EXPORT_SYMBOL(ucb1x00_register_driver); EXPORT_SYMBOL(ucb1x00_unregister_driver); diff --git a/drivers/mfd/ucb1x00-ts.c b/drivers/mfd/ucb1x00-ts.c index 742d0c7bbbc2..1e0e20c0e082 100644 --- a/drivers/mfd/ucb1x00-ts.c +++ b/drivers/mfd/ucb1x00-ts.c @@ -20,8 +20,9 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> -#include <linux/smp.h> +#include <linux/interrupt.h> #include <linux/sched.h> +#include <linux/spinlock.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/string.h> @@ -41,6 +42,8 @@ struct ucb1x00_ts { struct input_dev *idev; struct ucb1x00 *ucb; + spinlock_t irq_lock; + unsigned irq_disabled; wait_queue_head_t irq_wait; struct task_struct *rtask; u16 x_res; @@ -237,7 +240,12 @@ static int ucb1x00_thread(void *_ts) if (ucb1x00_ts_pen_down(ts)) { set_current_state(TASK_INTERRUPTIBLE); - ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING); + spin_lock_irq(&ts->irq_lock); + if (ts->irq_disabled) { + ts->irq_disabled = 0; + enable_irq(ts->ucb->irq_base + UCB_IRQ_TSPX); + } + spin_unlock_irq(&ts->irq_lock); ucb1x00_disable(ts->ucb); /* @@ -280,23 +288,37 @@ static int ucb1x00_thread(void *_ts) * We only detect touch screen _touches_ with this interrupt * handler, and even then we just schedule our task. */ -static void ucb1x00_ts_irq(int idx, void *id) +static irqreturn_t ucb1x00_ts_irq(int irq, void *id) { struct ucb1x00_ts *ts = id; - ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); + spin_lock(&ts->irq_lock); + ts->irq_disabled = 1; + disable_irq_nosync(ts->ucb->irq_base + UCB_IRQ_TSPX); + spin_unlock(&ts->irq_lock); wake_up(&ts->irq_wait); + + return IRQ_HANDLED; } static int ucb1x00_ts_open(struct input_dev *idev) { struct ucb1x00_ts *ts = input_get_drvdata(idev); + unsigned long flags = 0; int ret = 0; BUG_ON(ts->rtask); + if (machine_is_collie()) + flags = IRQF_TRIGGER_RISING; + else + flags = IRQF_TRIGGER_FALLING; + + ts->irq_disabled = 0; + init_waitqueue_head(&ts->irq_wait); - ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts); + ret = request_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ucb1x00_ts_irq, + flags, "ucb1x00-ts", ts); if (ret < 0) goto out; @@ -313,7 +335,7 @@ static int ucb1x00_ts_open(struct input_dev *idev) if (!IS_ERR(ts->rtask)) { ret = 0; } else { - ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); + free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts); ts->rtask = NULL; ret = -EFAULT; } @@ -333,7 +355,7 @@ static void ucb1x00_ts_close(struct input_dev *idev) kthread_stop(ts->rtask); ucb1x00_enable(ts->ucb); - ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); + free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts); ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); ucb1x00_disable(ts->ucb); } @@ -358,6 +380,7 @@ static int ucb1x00_ts_add(struct ucb1x00_dev *dev) ts->ucb = dev->ucb; ts->idev = idev; ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; + spin_lock_init(&ts->irq_lock); idev->name = "Touchscreen panel"; idev->id.product = ts->ucb->id; diff --git a/include/linux/mfd/ucb1x00.h b/include/linux/mfd/ucb1x00.h index 253c12c157a6..6fb907446c33 100644 --- a/include/linux/mfd/ucb1x00.h +++ b/include/linux/mfd/ucb1x00.h @@ -112,18 +112,15 @@ enum ucb1x00_reset { struct ucb1x00_plat_data { void (*reset)(enum ucb1x00_reset); + unsigned irq_base; int gpio_base; }; -struct ucb1x00_irq { - void *devid; - void (*fn)(int, void *); -}; - struct ucb1x00 { - spinlock_t lock; + raw_spinlock_t irq_lock; struct mcp *mcp; unsigned int irq; + int irq_base; struct mutex adc_mutex; spinlock_t io_lock; u16 id; @@ -132,7 +129,7 @@ struct ucb1x00 { u16 adc_cr; u16 irq_fal_enbl; u16 irq_ris_enbl; - struct ucb1x00_irq irq_handler[16]; + u16 irq_mask; struct device dev; struct list_head node; struct list_head devs; @@ -255,15 +252,4 @@ unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync); void ucb1x00_adc_enable(struct ucb1x00 *ucb); void ucb1x00_adc_disable(struct ucb1x00 *ucb); -/* - * Which edges of the IRQ do you want to control today? - */ -#define UCB_RISING (1 << 0) -#define UCB_FALLING (1 << 1) - -int ucb1x00_hook_irq(struct ucb1x00 *ucb, unsigned int idx, void (*fn)(int, void *), void *devid); -void ucb1x00_enable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges); -void ucb1x00_disable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges); -int ucb1x00_free_irq(struct ucb1x00 *ucb, unsigned int idx, void *devid); - #endif |