diff options
Diffstat (limited to 'drivers/input/misc/ixp4xx-beeper.c')
| -rw-r--r-- | drivers/input/misc/ixp4xx-beeper.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/input/misc/ixp4xx-beeper.c b/drivers/input/misc/ixp4xx-beeper.c new file mode 100644 index 000000000..794ecc9a5 --- /dev/null +++ b/drivers/input/misc/ixp4xx-beeper.c @@ -0,0 +1,183 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic IXP4xx beeper driver + * + * Copyright (C) 2005 Tower Technologies + * + * based on nslu2-io.c + * Copyright (C) 2004 Karen Spearel + * + * Author: Alessandro Zummo <a.zummo@towertech.it> + * Maintainers: http://www.nslu2-linux.org/ + */ + +#include <linux/module.h> +#include <linux/input.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <mach/hardware.h> + +MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); +MODULE_DESCRIPTION("ixp4xx beeper driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ixp4xx-beeper"); + +static DEFINE_SPINLOCK(beep_lock); + +static int ixp4xx_timer2_irq; + +static void ixp4xx_spkr_control(unsigned int pin, unsigned int count) +{ + unsigned long flags; + + spin_lock_irqsave(&beep_lock, flags); + + if (count) { + gpio_direction_output(pin, 0); + *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE; + } else { + gpio_direction_output(pin, 1); + gpio_direction_input(pin); + *IXP4XX_OSRT2 = 0; + } + + spin_unlock_irqrestore(&beep_lock, flags); +} + +static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) +{ + unsigned int pin = (unsigned int) input_get_drvdata(dev); + unsigned int count = 0; + + if (type != EV_SND) + return -1; + + switch (code) { + case SND_BELL: + if (value) + value = 1000; + case SND_TONE: + break; + default: + return -1; + } + + if (value > 20 && value < 32767) + count = (ixp4xx_timer_freq / (value * 4)) - 1; + + ixp4xx_spkr_control(pin, count); + + return 0; +} + +static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id) +{ + unsigned int pin = (unsigned int) dev_id; + + /* clear interrupt */ + *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND; + + /* flip the beeper output */ + gpio_set_value(pin, !gpio_get_value(pin)); + + return IRQ_HANDLED; +} + +static int ixp4xx_spkr_probe(struct platform_device *dev) +{ + struct input_dev *input_dev; + int irq; + int err; + + input_dev = input_allocate_device(); + if (!input_dev) + return -ENOMEM; + + input_set_drvdata(input_dev, (void *) dev->id); + + input_dev->name = "ixp4xx beeper", + input_dev->phys = "ixp4xx/gpio"; + input_dev->id.bustype = BUS_HOST; + input_dev->id.vendor = 0x001f; + input_dev->id.product = 0x0001; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &dev->dev; + + input_dev->evbit[0] = BIT_MASK(EV_SND); + input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); + input_dev->event = ixp4xx_spkr_event; + + irq = platform_get_irq(dev, 0); + if (irq < 0) { + err = irq; + goto err_free_device; + } + + err = gpio_request(dev->id, "ixp4-beeper"); + if (err) + goto err_free_device; + + err = request_irq(irq, &ixp4xx_spkr_interrupt, + IRQF_NO_SUSPEND, "ixp4xx-beeper", + (void *) dev->id); + if (err) + goto err_free_gpio; + ixp4xx_timer2_irq = irq; + + err = input_register_device(input_dev); + if (err) + goto err_free_irq; + + platform_set_drvdata(dev, input_dev); + + return 0; + + err_free_irq: + free_irq(irq, (void *)dev->id); + err_free_gpio: + gpio_free(dev->id); + err_free_device: + input_free_device(input_dev); + + return err; +} + +static int ixp4xx_spkr_remove(struct platform_device *dev) +{ + struct input_dev *input_dev = platform_get_drvdata(dev); + unsigned int pin = (unsigned int) input_get_drvdata(input_dev); + + input_unregister_device(input_dev); + + /* turn the speaker off */ + disable_irq(ixp4xx_timer2_irq); + ixp4xx_spkr_control(pin, 0); + + free_irq(ixp4xx_timer2_irq, (void *)dev->id); + gpio_free(dev->id); + + return 0; +} + +static void ixp4xx_spkr_shutdown(struct platform_device *dev) +{ + struct input_dev *input_dev = platform_get_drvdata(dev); + unsigned int pin = (unsigned int) input_get_drvdata(input_dev); + + /* turn off the speaker */ + disable_irq(ixp4xx_timer2_irq); + ixp4xx_spkr_control(pin, 0); +} + +static struct platform_driver ixp4xx_spkr_platform_driver = { + .driver = { + .name = "ixp4xx-beeper", + }, + .probe = ixp4xx_spkr_probe, + .remove = ixp4xx_spkr_remove, + .shutdown = ixp4xx_spkr_shutdown, +}; +module_platform_driver(ixp4xx_spkr_platform_driver); + |