Commit | Line | Data |
---|---|---|
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> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/pwm.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | struct pwm_beeper { | |
24 | struct input_dev *input; | |
25 | struct pwm_device *pwm; | |
26 | unsigned long period; | |
27 | }; | |
28 | ||
29 | #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x)) | |
30 | ||
31 | static int pwm_beeper_event(struct input_dev *input, | |
32 | unsigned int type, unsigned int code, int value) | |
33 | { | |
34 | int ret = 0; | |
35 | struct pwm_beeper *beeper = input_get_drvdata(input); | |
36 | unsigned long period; | |
37 | ||
38 | if (type != EV_SND || value < 0) | |
39 | return -EINVAL; | |
40 | ||
41 | switch (code) { | |
42 | case SND_BELL: | |
43 | value = value ? 1000 : 0; | |
44 | break; | |
45 | case SND_TONE: | |
46 | break; | |
47 | default: | |
48 | return -EINVAL; | |
49 | } | |
50 | ||
51 | if (value == 0) { | |
52 | pwm_config(beeper->pwm, 0, 0); | |
53 | pwm_disable(beeper->pwm); | |
54 | } else { | |
55 | period = HZ_TO_NANOSECONDS(value); | |
56 | ret = pwm_config(beeper->pwm, period / 2, period); | |
57 | if (ret) | |
58 | return ret; | |
59 | ret = pwm_enable(beeper->pwm); | |
60 | if (ret) | |
61 | return ret; | |
62 | beeper->period = period; | |
63 | } | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int __devinit pwm_beeper_probe(struct platform_device *pdev) | |
69 | { | |
70 | unsigned long pwm_id = (unsigned long)pdev->dev.platform_data; | |
71 | struct pwm_beeper *beeper; | |
72 | int error; | |
73 | ||
74 | beeper = kzalloc(sizeof(*beeper), GFP_KERNEL); | |
75 | if (!beeper) | |
76 | return -ENOMEM; | |
77 | ||
78 | beeper->pwm = pwm_request(pwm_id, "pwm beeper"); | |
79 | ||
80 | if (IS_ERR(beeper->pwm)) { | |
81 | error = PTR_ERR(beeper->pwm); | |
82 | dev_err(&pdev->dev, "Failed to request pwm device: %d\n", error); | |
83 | goto err_free; | |
84 | } | |
85 | ||
86 | beeper->input = input_allocate_device(); | |
87 | if (!beeper->input) { | |
88 | dev_err(&pdev->dev, "Failed to allocate input device\n"); | |
89 | error = -ENOMEM; | |
90 | goto err_pwm_free; | |
91 | } | |
92 | beeper->input->dev.parent = &pdev->dev; | |
93 | ||
94 | beeper->input->name = "pwm-beeper"; | |
95 | beeper->input->phys = "pwm/input0"; | |
96 | beeper->input->id.bustype = BUS_HOST; | |
97 | beeper->input->id.vendor = 0x001f; | |
98 | beeper->input->id.product = 0x0001; | |
99 | beeper->input->id.version = 0x0100; | |
100 | ||
101 | beeper->input->evbit[0] = BIT(EV_SND); | |
102 | beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL); | |
103 | ||
104 | beeper->input->event = pwm_beeper_event; | |
105 | ||
106 | input_set_drvdata(beeper->input, beeper); | |
107 | ||
108 | error = input_register_device(beeper->input); | |
109 | if (error) { | |
110 | dev_err(&pdev->dev, "Failed to register input device: %d\n", error); | |
111 | goto err_input_free; | |
112 | } | |
113 | ||
114 | platform_set_drvdata(pdev, beeper); | |
115 | ||
116 | return 0; | |
117 | ||
118 | err_input_free: | |
119 | input_free_device(beeper->input); | |
120 | err_pwm_free: | |
121 | pwm_free(beeper->pwm); | |
122 | err_free: | |
123 | kfree(beeper); | |
124 | ||
125 | return error; | |
126 | } | |
127 | ||
128 | static int __devexit pwm_beeper_remove(struct platform_device *pdev) | |
129 | { | |
130 | struct pwm_beeper *beeper = platform_get_drvdata(pdev); | |
131 | ||
132 | platform_set_drvdata(pdev, NULL); | |
133 | input_unregister_device(beeper->input); | |
134 | ||
135 | pwm_disable(beeper->pwm); | |
136 | pwm_free(beeper->pwm); | |
137 | ||
138 | kfree(beeper); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | #ifdef CONFIG_PM | |
144 | static int pwm_beeper_suspend(struct device *dev) | |
145 | { | |
146 | struct pwm_beeper *beeper = dev_get_drvdata(dev); | |
147 | ||
148 | if (beeper->period) | |
149 | pwm_disable(beeper->pwm); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static int pwm_beeper_resume(struct device *dev) | |
155 | { | |
156 | struct pwm_beeper *beeper = dev_get_drvdata(dev); | |
157 | ||
158 | if (beeper->period) { | |
159 | pwm_config(beeper->pwm, beeper->period / 2, beeper->period); | |
160 | pwm_enable(beeper->pwm); | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops, | |
167 | pwm_beeper_suspend, pwm_beeper_resume); | |
168 | ||
169 | #define PWM_BEEPER_PM_OPS (&pwm_beeper_pm_ops) | |
170 | #else | |
171 | #define PWM_BEEPER_PM_OPS NULL | |
172 | #endif | |
173 | ||
174 | static struct platform_driver pwm_beeper_driver = { | |
175 | .probe = pwm_beeper_probe, | |
176 | .remove = __devexit_p(pwm_beeper_remove), | |
177 | .driver = { | |
178 | .name = "pwm-beeper", | |
179 | .owner = THIS_MODULE, | |
180 | .pm = PWM_BEEPER_PM_OPS, | |
181 | }, | |
182 | }; | |
840a746b | 183 | module_platform_driver(pwm_beeper_driver); |
e22739d0 LPC |
184 | |
185 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
186 | MODULE_DESCRIPTION("PWM beeper driver"); | |
187 | MODULE_LICENSE("GPL"); | |
188 | MODULE_ALIAS("platform:pwm-beeper"); |