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>
20 #include <linux/platform_device.h>
21 #include <linux/pwm.h>
22 #include <linux/slab.h>
23 #include <linux/workqueue.h>
26 struct input_dev
*input
;
27 struct pwm_device
*pwm
;
28 struct work_struct work
;
32 #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))
34 static void __pwm_beeper_set(struct pwm_beeper
*beeper
)
36 unsigned long period
= beeper
->period
;
39 pwm_config(beeper
->pwm
, period
/ 2, period
);
40 pwm_enable(beeper
->pwm
);
42 pwm_disable(beeper
->pwm
);
45 static void pwm_beeper_work(struct work_struct
*work
)
47 struct pwm_beeper
*beeper
=
48 container_of(work
, struct pwm_beeper
, work
);
50 __pwm_beeper_set(beeper
);
53 static int pwm_beeper_event(struct input_dev
*input
,
54 unsigned int type
, unsigned int code
, int value
)
56 struct pwm_beeper
*beeper
= input_get_drvdata(input
);
58 if (type
!= EV_SND
|| value
< 0)
63 value
= value
? 1000 : 0;
74 beeper
->period
= HZ_TO_NANOSECONDS(value
);
76 schedule_work(&beeper
->work
);
81 static void pwm_beeper_stop(struct pwm_beeper
*beeper
)
83 cancel_work_sync(&beeper
->work
);
86 pwm_disable(beeper
->pwm
);
89 static void pwm_beeper_close(struct input_dev
*input
)
91 struct pwm_beeper
*beeper
= input_get_drvdata(input
);
93 pwm_beeper_stop(beeper
);
96 static int pwm_beeper_probe(struct platform_device
*pdev
)
98 unsigned long pwm_id
= (unsigned long)dev_get_platdata(&pdev
->dev
);
99 struct pwm_beeper
*beeper
;
102 beeper
= kzalloc(sizeof(*beeper
), GFP_KERNEL
);
106 beeper
->pwm
= pwm_get(&pdev
->dev
, NULL
);
107 if (IS_ERR(beeper
->pwm
)) {
108 dev_dbg(&pdev
->dev
, "unable to request PWM, trying legacy API\n");
109 beeper
->pwm
= pwm_request(pwm_id
, "pwm beeper");
112 if (IS_ERR(beeper
->pwm
)) {
113 error
= PTR_ERR(beeper
->pwm
);
114 dev_err(&pdev
->dev
, "Failed to request pwm device: %d\n", error
);
118 INIT_WORK(&beeper
->work
, pwm_beeper_work
);
120 beeper
->input
= input_allocate_device();
121 if (!beeper
->input
) {
122 dev_err(&pdev
->dev
, "Failed to allocate input device\n");
126 beeper
->input
->dev
.parent
= &pdev
->dev
;
128 beeper
->input
->name
= "pwm-beeper";
129 beeper
->input
->phys
= "pwm/input0";
130 beeper
->input
->id
.bustype
= BUS_HOST
;
131 beeper
->input
->id
.vendor
= 0x001f;
132 beeper
->input
->id
.product
= 0x0001;
133 beeper
->input
->id
.version
= 0x0100;
135 beeper
->input
->evbit
[0] = BIT(EV_SND
);
136 beeper
->input
->sndbit
[0] = BIT(SND_TONE
) | BIT(SND_BELL
);
138 beeper
->input
->event
= pwm_beeper_event
;
139 beeper
->input
->close
= pwm_beeper_close
;
141 input_set_drvdata(beeper
->input
, beeper
);
143 error
= input_register_device(beeper
->input
);
145 dev_err(&pdev
->dev
, "Failed to register input device: %d\n", error
);
149 platform_set_drvdata(pdev
, beeper
);
154 input_free_device(beeper
->input
);
156 pwm_free(beeper
->pwm
);
163 static int pwm_beeper_remove(struct platform_device
*pdev
)
165 struct pwm_beeper
*beeper
= platform_get_drvdata(pdev
);
167 input_unregister_device(beeper
->input
);
169 pwm_free(beeper
->pwm
);
176 static int __maybe_unused
pwm_beeper_suspend(struct device
*dev
)
178 struct pwm_beeper
*beeper
= dev_get_drvdata(dev
);
180 pwm_beeper_stop(beeper
);
185 static int __maybe_unused
pwm_beeper_resume(struct device
*dev
)
187 struct pwm_beeper
*beeper
= dev_get_drvdata(dev
);
190 __pwm_beeper_set(beeper
);
195 static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops
,
196 pwm_beeper_suspend
, pwm_beeper_resume
);
199 static const struct of_device_id pwm_beeper_match
[] = {
200 { .compatible
= "pwm-beeper", },
203 MODULE_DEVICE_TABLE(of
, pwm_beeper_match
);
206 static struct platform_driver pwm_beeper_driver
= {
207 .probe
= pwm_beeper_probe
,
208 .remove
= pwm_beeper_remove
,
210 .name
= "pwm-beeper",
211 .pm
= &pwm_beeper_pm_ops
,
212 .of_match_table
= of_match_ptr(pwm_beeper_match
),
215 module_platform_driver(pwm_beeper_driver
);
217 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
218 MODULE_DESCRIPTION("PWM beeper driver");
219 MODULE_LICENSE("GPL");
220 MODULE_ALIAS("platform:pwm-beeper");