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e22739d0 LPC |
1 | /* |
2 | * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> | |
3 | * PWM beeper driver | |
4 | * | |
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. | |
9 | * | |
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. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/input.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
9dbe4c32 | 19 | #include <linux/of.h> |
e22739d0 LPC |
20 | #include <linux/platform_device.h> |
21 | #include <linux/pwm.h> | |
22 | #include <linux/slab.h> | |
f49cf3b8 | 23 | #include <linux/workqueue.h> |
e22739d0 LPC |
24 | |
25 | struct pwm_beeper { | |
26 | struct input_dev *input; | |
27 | struct pwm_device *pwm; | |
f49cf3b8 | 28 | struct work_struct work; |
e22739d0 LPC |
29 | unsigned long period; |
30 | }; | |
31 | ||
32 | #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x)) | |
33 | ||
f49cf3b8 MS |
34 | static void __pwm_beeper_set(struct pwm_beeper *beeper) |
35 | { | |
36 | unsigned long period = beeper->period; | |
37 | ||
38 | if (period) { | |
39 | pwm_config(beeper->pwm, period / 2, period); | |
40 | pwm_enable(beeper->pwm); | |
41 | } else | |
42 | pwm_disable(beeper->pwm); | |
43 | } | |
44 | ||
45 | static void pwm_beeper_work(struct work_struct *work) | |
46 | { | |
47 | struct pwm_beeper *beeper = | |
48 | container_of(work, struct pwm_beeper, work); | |
49 | ||
50 | __pwm_beeper_set(beeper); | |
51 | } | |
52 | ||
e22739d0 LPC |
53 | static int pwm_beeper_event(struct input_dev *input, |
54 | unsigned int type, unsigned int code, int value) | |
55 | { | |
e22739d0 | 56 | struct pwm_beeper *beeper = input_get_drvdata(input); |
e22739d0 LPC |
57 | |
58 | if (type != EV_SND || value < 0) | |
59 | return -EINVAL; | |
60 | ||
61 | switch (code) { | |
62 | case SND_BELL: | |
63 | value = value ? 1000 : 0; | |
64 | break; | |
65 | case SND_TONE: | |
66 | break; | |
67 | default: | |
68 | return -EINVAL; | |
69 | } | |
70 | ||
f49cf3b8 MS |
71 | if (value == 0) |
72 | beeper->period = 0; | |
73 | else | |
74 | beeper->period = HZ_TO_NANOSECONDS(value); | |
75 | ||
76 | schedule_work(&beeper->work); | |
e22739d0 LPC |
77 | |
78 | return 0; | |
79 | } | |
80 | ||
f49cf3b8 MS |
81 | static void pwm_beeper_stop(struct pwm_beeper *beeper) |
82 | { | |
83 | cancel_work_sync(&beeper->work); | |
84 | ||
85 | if (beeper->period) | |
86 | pwm_disable(beeper->pwm); | |
87 | } | |
88 | ||
89 | static void pwm_beeper_close(struct input_dev *input) | |
90 | { | |
91 | struct pwm_beeper *beeper = input_get_drvdata(input); | |
92 | ||
93 | pwm_beeper_stop(beeper); | |
94 | } | |
95 | ||
5298cc4c | 96 | static int pwm_beeper_probe(struct platform_device *pdev) |
e22739d0 | 97 | { |
c838cb3d | 98 | unsigned long pwm_id = (unsigned long)dev_get_platdata(&pdev->dev); |
e22739d0 LPC |
99 | struct pwm_beeper *beeper; |
100 | int error; | |
101 | ||
102 | beeper = kzalloc(sizeof(*beeper), GFP_KERNEL); | |
103 | if (!beeper) | |
104 | return -ENOMEM; | |
105 | ||
d56a289b SH |
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"); | |
110 | } | |
e22739d0 LPC |
111 | |
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); | |
115 | goto err_free; | |
116 | } | |
117 | ||
cfae56f1 BB |
118 | /* |
119 | * FIXME: pwm_apply_args() should be removed when switching to | |
120 | * the atomic PWM API. | |
121 | */ | |
122 | pwm_apply_args(beeper->pwm); | |
123 | ||
f49cf3b8 MS |
124 | INIT_WORK(&beeper->work, pwm_beeper_work); |
125 | ||
e22739d0 LPC |
126 | beeper->input = input_allocate_device(); |
127 | if (!beeper->input) { | |
128 | dev_err(&pdev->dev, "Failed to allocate input device\n"); | |
129 | error = -ENOMEM; | |
130 | goto err_pwm_free; | |
131 | } | |
132 | beeper->input->dev.parent = &pdev->dev; | |
133 | ||
134 | beeper->input->name = "pwm-beeper"; | |
135 | beeper->input->phys = "pwm/input0"; | |
136 | beeper->input->id.bustype = BUS_HOST; | |
137 | beeper->input->id.vendor = 0x001f; | |
138 | beeper->input->id.product = 0x0001; | |
139 | beeper->input->id.version = 0x0100; | |
140 | ||
141 | beeper->input->evbit[0] = BIT(EV_SND); | |
142 | beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL); | |
143 | ||
144 | beeper->input->event = pwm_beeper_event; | |
f49cf3b8 | 145 | beeper->input->close = pwm_beeper_close; |
e22739d0 LPC |
146 | |
147 | input_set_drvdata(beeper->input, beeper); | |
148 | ||
149 | error = input_register_device(beeper->input); | |
150 | if (error) { | |
151 | dev_err(&pdev->dev, "Failed to register input device: %d\n", error); | |
152 | goto err_input_free; | |
153 | } | |
154 | ||
155 | platform_set_drvdata(pdev, beeper); | |
156 | ||
157 | return 0; | |
158 | ||
159 | err_input_free: | |
160 | input_free_device(beeper->input); | |
161 | err_pwm_free: | |
162 | pwm_free(beeper->pwm); | |
163 | err_free: | |
164 | kfree(beeper); | |
165 | ||
166 | return error; | |
167 | } | |
168 | ||
e2619cf7 | 169 | static int pwm_beeper_remove(struct platform_device *pdev) |
e22739d0 LPC |
170 | { |
171 | struct pwm_beeper *beeper = platform_get_drvdata(pdev); | |
172 | ||
e22739d0 LPC |
173 | input_unregister_device(beeper->input); |
174 | ||
e22739d0 LPC |
175 | pwm_free(beeper->pwm); |
176 | ||
177 | kfree(beeper); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
97a652a8 | 182 | static int __maybe_unused pwm_beeper_suspend(struct device *dev) |
e22739d0 LPC |
183 | { |
184 | struct pwm_beeper *beeper = dev_get_drvdata(dev); | |
185 | ||
f49cf3b8 | 186 | pwm_beeper_stop(beeper); |
e22739d0 LPC |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
97a652a8 | 191 | static int __maybe_unused pwm_beeper_resume(struct device *dev) |
e22739d0 LPC |
192 | { |
193 | struct pwm_beeper *beeper = dev_get_drvdata(dev); | |
194 | ||
f49cf3b8 MS |
195 | if (beeper->period) |
196 | __pwm_beeper_set(beeper); | |
e22739d0 LPC |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops, | |
202 | pwm_beeper_suspend, pwm_beeper_resume); | |
203 | ||
d56a289b SH |
204 | #ifdef CONFIG_OF |
205 | static const struct of_device_id pwm_beeper_match[] = { | |
206 | { .compatible = "pwm-beeper", }, | |
207 | { }, | |
208 | }; | |
544edf56 | 209 | MODULE_DEVICE_TABLE(of, pwm_beeper_match); |
d56a289b SH |
210 | #endif |
211 | ||
e22739d0 LPC |
212 | static struct platform_driver pwm_beeper_driver = { |
213 | .probe = pwm_beeper_probe, | |
1cb0aa88 | 214 | .remove = pwm_beeper_remove, |
e22739d0 LPC |
215 | .driver = { |
216 | .name = "pwm-beeper", | |
ceb5b6c8 | 217 | .pm = &pwm_beeper_pm_ops, |
d56a289b | 218 | .of_match_table = of_match_ptr(pwm_beeper_match), |
e22739d0 LPC |
219 | }, |
220 | }; | |
840a746b | 221 | module_platform_driver(pwm_beeper_driver); |
e22739d0 LPC |
222 | |
223 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
224 | MODULE_DESCRIPTION("PWM beeper driver"); | |
225 | MODULE_LICENSE("GPL"); | |
226 | MODULE_ALIAS("platform:pwm-beeper"); |