2 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
16 #include <linux/input.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/platform_device.h>
20 #include <linux/pwm.h>
21 #include <linux/slab.h>
22 #include <linux/workqueue.h>
25 struct input_dev *input;
26 struct pwm_device *pwm;
27 struct work_struct work;
31 #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))
33 static void __pwm_beeper_set(struct pwm_beeper *beeper)
35 unsigned long period = beeper->period;
38 pwm_config(beeper->pwm, period / 2, period);
39 pwm_enable(beeper->pwm);
41 pwm_disable(beeper->pwm);
44 static void pwm_beeper_work(struct work_struct *work)
46 struct pwm_beeper *beeper =
47 container_of(work, struct pwm_beeper, work);
49 __pwm_beeper_set(beeper);
52 static int pwm_beeper_event(struct input_dev *input,
53 unsigned int type, unsigned int code, int value)
55 struct pwm_beeper *beeper = input_get_drvdata(input);
57 if (type != EV_SND || value < 0)
62 value = value ? 1000 : 0;
73 beeper->period = HZ_TO_NANOSECONDS(value);
75 schedule_work(&beeper->work);
80 static void pwm_beeper_stop(struct pwm_beeper *beeper)
82 cancel_work_sync(&beeper->work);
85 pwm_disable(beeper->pwm);
88 static void pwm_beeper_close(struct input_dev *input)
90 struct pwm_beeper *beeper = input_get_drvdata(input);
92 pwm_beeper_stop(beeper);
95 static int __devinit pwm_beeper_probe(struct platform_device *pdev)
97 unsigned long pwm_id = (unsigned long)pdev->dev.platform_data;
98 struct pwm_beeper *beeper;
101 beeper = kzalloc(sizeof(*beeper), GFP_KERNEL);
105 beeper->pwm = pwm_request(pwm_id, "pwm beeper");
107 if (IS_ERR(beeper->pwm)) {
108 error = PTR_ERR(beeper->pwm);
109 dev_err(&pdev->dev, "Failed to request pwm device: %d\n", error);
113 INIT_WORK(&beeper->work, pwm_beeper_work);
115 beeper->input = input_allocate_device();
116 if (!beeper->input) {
117 dev_err(&pdev->dev, "Failed to allocate input device\n");
121 beeper->input->dev.parent = &pdev->dev;
123 beeper->input->name = "pwm-beeper";
124 beeper->input->phys = "pwm/input0";
125 beeper->input->id.bustype = BUS_HOST;
126 beeper->input->id.vendor = 0x001f;
127 beeper->input->id.product = 0x0001;
128 beeper->input->id.version = 0x0100;
130 beeper->input->evbit[0] = BIT(EV_SND);
131 beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL);
133 beeper->input->event = pwm_beeper_event;
134 beeper->input->close = pwm_beeper_close;
136 input_set_drvdata(beeper->input, beeper);
138 error = input_register_device(beeper->input);
140 dev_err(&pdev->dev, "Failed to register input device: %d\n", error);
144 platform_set_drvdata(pdev, beeper);
149 input_free_device(beeper->input);
151 pwm_free(beeper->pwm);
158 static int __devexit pwm_beeper_remove(struct platform_device *pdev)
160 struct pwm_beeper *beeper = platform_get_drvdata(pdev);
162 platform_set_drvdata(pdev, NULL);
163 input_unregister_device(beeper->input);
165 pwm_free(beeper->pwm);
173 static int pwm_beeper_suspend(struct device *dev)
175 struct pwm_beeper *beeper = dev_get_drvdata(dev);
177 pwm_beeper_stop(beeper);
182 static int pwm_beeper_resume(struct device *dev)
184 struct pwm_beeper *beeper = dev_get_drvdata(dev);
187 __pwm_beeper_set(beeper);
192 static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops,
193 pwm_beeper_suspend, pwm_beeper_resume);
195 #define PWM_BEEPER_PM_OPS (&pwm_beeper_pm_ops)
197 #define PWM_BEEPER_PM_OPS NULL
200 static struct platform_driver pwm_beeper_driver = {
201 .probe = pwm_beeper_probe,
202 .remove = __devexit_p(pwm_beeper_remove),
204 .name = "pwm-beeper",
205 .owner = THIS_MODULE,
206 .pm = PWM_BEEPER_PM_OPS,
210 static int __init pwm_beeper_init(void)
212 return platform_driver_register(&pwm_beeper_driver);
214 module_init(pwm_beeper_init);
216 static void __exit pwm_beeper_exit(void)
218 platform_driver_unregister(&pwm_beeper_driver);
220 module_exit(pwm_beeper_exit);
222 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
223 MODULE_DESCRIPTION("PWM beeper driver");
224 MODULE_LICENSE("GPL");
225 MODULE_ALIAS("platform:pwm-beeper");