Alessandro Zummo | 0138795 | 2006-01-29 21:50:40 -0500 | [diff] [blame^] | 1 | /* |
| 2 | * Generic IXP4xx beeper driver |
| 3 | * |
| 4 | * Copyright (C) 2005 Tower Technologies |
| 5 | * |
| 6 | * based on nslu2-io.c |
| 7 | * Copyright (C) 2004 Karen Spearel |
| 8 | * |
| 9 | * Author: Alessandro Zummo <a.zummo@towertech.it> |
| 10 | * Maintainers: http://www.nslu2-linux.org/ |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License version 2 as |
| 14 | * published by the Free Software Foundation. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/input.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <asm/hardware.h> |
| 23 | |
| 24 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); |
| 25 | MODULE_DESCRIPTION("ixp4xx beeper driver"); |
| 26 | MODULE_LICENSE("GPL"); |
| 27 | |
| 28 | static DEFINE_SPINLOCK(beep_lock); |
| 29 | |
| 30 | static void ixp4xx_spkr_control(unsigned int pin, unsigned int count) |
| 31 | { |
| 32 | unsigned long flags; |
| 33 | |
| 34 | spin_lock_irqsave(&beep_lock, flags); |
| 35 | |
| 36 | if (count) { |
| 37 | gpio_line_config(pin, IXP4XX_GPIO_OUT); |
| 38 | gpio_line_set(pin, IXP4XX_GPIO_LOW); |
| 39 | |
| 40 | *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE; |
| 41 | } else { |
| 42 | gpio_line_config(pin, IXP4XX_GPIO_IN); |
| 43 | gpio_line_set(pin, IXP4XX_GPIO_HIGH); |
| 44 | |
| 45 | *IXP4XX_OSRT2 = 0; |
| 46 | } |
| 47 | |
| 48 | spin_unlock_irqrestore(&beep_lock, flags); |
| 49 | } |
| 50 | |
| 51 | static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) |
| 52 | { |
| 53 | unsigned int pin = (unsigned int) dev->private; |
| 54 | unsigned int count = 0; |
| 55 | |
| 56 | if (type != EV_SND) |
| 57 | return -1; |
| 58 | |
| 59 | switch (code) { |
| 60 | case SND_BELL: |
| 61 | if (value) |
| 62 | value = 1000; |
| 63 | case SND_TONE: |
| 64 | break; |
| 65 | default: |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | if (value > 20 && value < 32767) |
| 70 | #ifndef FREQ |
| 71 | count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1; |
| 72 | #else |
| 73 | count = (FREQ / (value * 4)) - 1; |
| 74 | #endif |
| 75 | |
| 76 | ixp4xx_spkr_control(pin, count); |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 82 | { |
| 83 | /* clear interrupt */ |
| 84 | *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND; |
| 85 | |
| 86 | /* flip the beeper output */ |
| 87 | *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id); |
| 88 | |
| 89 | return IRQ_HANDLED; |
| 90 | } |
| 91 | |
| 92 | static int __devinit ixp4xx_spkr_probe(struct platform_device *dev) |
| 93 | { |
| 94 | struct input_dev *input_dev; |
| 95 | int err; |
| 96 | |
| 97 | input_dev = input_allocate_device(); |
| 98 | if (!input_dev) |
| 99 | return -ENOMEM; |
| 100 | |
| 101 | input_dev->private = (void *) dev->id; |
| 102 | input_dev->name = "ixp4xx beeper", |
| 103 | input_dev->phys = "ixp4xx/gpio"; |
| 104 | input_dev->id.bustype = BUS_HOST; |
| 105 | input_dev->id.vendor = 0x001f; |
| 106 | input_dev->id.product = 0x0001; |
| 107 | input_dev->id.version = 0x0100; |
| 108 | input_dev->cdev.dev = &dev->dev; |
| 109 | |
| 110 | input_dev->evbit[0] = BIT(EV_SND); |
| 111 | input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); |
| 112 | input_dev->event = ixp4xx_spkr_event; |
| 113 | |
| 114 | err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt, |
| 115 | SA_INTERRUPT | SA_TIMER, "ixp4xx-beeper", (void *) dev->id); |
| 116 | if (err) |
| 117 | goto err_free_device; |
| 118 | |
| 119 | err = input_register_device(input_dev); |
| 120 | if (err) |
| 121 | goto err_free_irq; |
| 122 | |
| 123 | platform_set_drvdata(dev, input_dev); |
| 124 | |
| 125 | return 0; |
| 126 | |
| 127 | err_free_irq: |
| 128 | free_irq(IRQ_IXP4XX_TIMER2, dev); |
| 129 | err_free_device: |
| 130 | input_free_device(input_dev); |
| 131 | |
| 132 | return err; |
| 133 | } |
| 134 | |
| 135 | static int __devexit ixp4xx_spkr_remove(struct platform_device *dev) |
| 136 | { |
| 137 | struct input_dev *input_dev = platform_get_drvdata(dev); |
| 138 | unsigned int pin = (unsigned int) input_dev->private; |
| 139 | |
| 140 | input_unregister_device(input_dev); |
| 141 | platform_set_drvdata(dev, NULL); |
| 142 | |
| 143 | /* turn the speaker off */ |
| 144 | disable_irq(IRQ_IXP4XX_TIMER2); |
| 145 | ixp4xx_spkr_control(pin, 0); |
| 146 | |
| 147 | free_irq(IRQ_IXP4XX_TIMER2, dev); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static void ixp4xx_spkr_shutdown(struct platform_device *dev) |
| 153 | { |
| 154 | struct input_dev *input_dev = platform_get_drvdata(dev); |
| 155 | unsigned int pin = (unsigned int) input_dev->private; |
| 156 | |
| 157 | /* turn off the speaker */ |
| 158 | disable_irq(IRQ_IXP4XX_TIMER2); |
| 159 | ixp4xx_spkr_control(pin, 0); |
| 160 | } |
| 161 | |
| 162 | static struct platform_driver ixp4xx_spkr_platform_driver = { |
| 163 | .driver = { |
| 164 | .name = "ixp4xx-beeper", |
| 165 | .owner = THIS_MODULE, |
| 166 | }, |
| 167 | .probe = ixp4xx_spkr_probe, |
| 168 | .remove = __devexit_p(ixp4xx_spkr_remove), |
| 169 | .shutdown = ixp4xx_spkr_shutdown, |
| 170 | }; |
| 171 | |
| 172 | static int __init ixp4xx_spkr_init(void) |
| 173 | { |
| 174 | return platform_driver_register(&ixp4xx_spkr_platform_driver); |
| 175 | } |
| 176 | |
| 177 | static void __exit ixp4xx_spkr_exit(void) |
| 178 | { |
| 179 | platform_driver_unregister(&ixp4xx_spkr_platform_driver); |
| 180 | } |
| 181 | |
| 182 | module_init(ixp4xx_spkr_init); |
| 183 | module_exit(ixp4xx_spkr_exit); |