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 <linux/interrupt.h> 23#include <asm/hardware.h> 24 25MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 26MODULE_DESCRIPTION("ixp4xx beeper driver"); 27MODULE_LICENSE("GPL"); 28 29static DEFINE_SPINLOCK(beep_lock); 30 31static void ixp4xx_spkr_control(unsigned int pin, unsigned int count) 32{ 33 unsigned long flags; 34 35 spin_lock_irqsave(&beep_lock, flags); 36 37 if (count) { 38 gpio_line_config(pin, IXP4XX_GPIO_OUT); 39 gpio_line_set(pin, IXP4XX_GPIO_LOW); 40 41 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE; 42 } else { 43 gpio_line_config(pin, IXP4XX_GPIO_IN); 44 gpio_line_set(pin, IXP4XX_GPIO_HIGH); 45 46 *IXP4XX_OSRT2 = 0; 47 } 48 49 spin_unlock_irqrestore(&beep_lock, flags); 50} 51 52static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 53{ 54 unsigned int pin = (unsigned int) input_get_drvdata(dev); 55 unsigned int count = 0; 56 57 if (type != EV_SND) 58 return -1; 59 60 switch (code) { 61 case SND_BELL: 62 if (value) 63 value = 1000; 64 case SND_TONE: 65 break; 66 default: 67 return -1; 68 } 69 70 if (value > 20 && value < 32767) 71#ifndef FREQ 72 count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1; 73#else 74 count = (FREQ / (value * 4)) - 1; 75#endif 76 77 ixp4xx_spkr_control(pin, count); 78 79 return 0; 80} 81 82static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id) 83{ 84 /* clear interrupt */ 85 *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND; 86 87 /* flip the beeper output */ 88 *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id); 89 90 return IRQ_HANDLED; 91} 92 93static int __devinit ixp4xx_spkr_probe(struct platform_device *dev) 94{ 95 struct input_dev *input_dev; 96 int err; 97 98 input_dev = input_allocate_device(); 99 if (!input_dev) 100 return -ENOMEM; 101 102 input_set_drvdata(input_dev, (void *) dev->id); 103 104 input_dev->name = "ixp4xx beeper", 105 input_dev->phys = "ixp4xx/gpio"; 106 input_dev->id.bustype = BUS_HOST; 107 input_dev->id.vendor = 0x001f; 108 input_dev->id.product = 0x0001; 109 input_dev->id.version = 0x0100; 110 input_dev->dev.parent = &dev->dev; 111 112 input_dev->evbit[0] = BIT(EV_SND); 113 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); 114 input_dev->event = ixp4xx_spkr_event; 115 116 err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt, 117 IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id); 118 if (err) 119 goto err_free_device; 120 121 err = input_register_device(input_dev); 122 if (err) 123 goto err_free_irq; 124 125 platform_set_drvdata(dev, input_dev); 126 127 return 0; 128 129 err_free_irq: 130 free_irq(IRQ_IXP4XX_TIMER2, dev); 131 err_free_device: 132 input_free_device(input_dev); 133 134 return err; 135} 136 137static int __devexit ixp4xx_spkr_remove(struct platform_device *dev) 138{ 139 struct input_dev *input_dev = platform_get_drvdata(dev); 140 unsigned int pin = (unsigned int) input_get_drvdata(input_dev); 141 142 input_unregister_device(input_dev); 143 platform_set_drvdata(dev, NULL); 144 145 /* turn the speaker off */ 146 disable_irq(IRQ_IXP4XX_TIMER2); 147 ixp4xx_spkr_control(pin, 0); 148 149 free_irq(IRQ_IXP4XX_TIMER2, dev); 150 151 return 0; 152} 153 154static void ixp4xx_spkr_shutdown(struct platform_device *dev) 155{ 156 struct input_dev *input_dev = platform_get_drvdata(dev); 157 unsigned int pin = (unsigned int) input_get_drvdata(input_dev); 158 159 /* turn off the speaker */ 160 disable_irq(IRQ_IXP4XX_TIMER2); 161 ixp4xx_spkr_control(pin, 0); 162} 163 164static struct platform_driver ixp4xx_spkr_platform_driver = { 165 .driver = { 166 .name = "ixp4xx-beeper", 167 .owner = THIS_MODULE, 168 }, 169 .probe = ixp4xx_spkr_probe, 170 .remove = __devexit_p(ixp4xx_spkr_remove), 171 .shutdown = ixp4xx_spkr_shutdown, 172}; 173 174static int __init ixp4xx_spkr_init(void) 175{ 176 return platform_driver_register(&ixp4xx_spkr_platform_driver); 177} 178 179static void __exit ixp4xx_spkr_exit(void) 180{ 181 platform_driver_unregister(&ixp4xx_spkr_platform_driver); 182} 183 184module_init(ixp4xx_spkr_init); 185module_exit(ixp4xx_spkr_exit); 186