Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 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 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 68 | static int pwm_beeper_probe(struct platform_device *pdev) |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 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 | |
Sascha Hauer | d56a289 | 2012-11-03 12:05:52 -0700 | [diff] [blame] | 78 | beeper->pwm = pwm_get(&pdev->dev, NULL); |
| 79 | if (IS_ERR(beeper->pwm)) { |
| 80 | dev_dbg(&pdev->dev, "unable to request PWM, trying legacy API\n"); |
| 81 | beeper->pwm = pwm_request(pwm_id, "pwm beeper"); |
| 82 | } |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 83 | |
| 84 | if (IS_ERR(beeper->pwm)) { |
| 85 | error = PTR_ERR(beeper->pwm); |
| 86 | dev_err(&pdev->dev, "Failed to request pwm device: %d\n", error); |
| 87 | goto err_free; |
| 88 | } |
| 89 | |
| 90 | beeper->input = input_allocate_device(); |
| 91 | if (!beeper->input) { |
| 92 | dev_err(&pdev->dev, "Failed to allocate input device\n"); |
| 93 | error = -ENOMEM; |
| 94 | goto err_pwm_free; |
| 95 | } |
| 96 | beeper->input->dev.parent = &pdev->dev; |
| 97 | |
| 98 | beeper->input->name = "pwm-beeper"; |
| 99 | beeper->input->phys = "pwm/input0"; |
| 100 | beeper->input->id.bustype = BUS_HOST; |
| 101 | beeper->input->id.vendor = 0x001f; |
| 102 | beeper->input->id.product = 0x0001; |
| 103 | beeper->input->id.version = 0x0100; |
| 104 | |
| 105 | beeper->input->evbit[0] = BIT(EV_SND); |
| 106 | beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL); |
| 107 | |
| 108 | beeper->input->event = pwm_beeper_event; |
| 109 | |
| 110 | input_set_drvdata(beeper->input, beeper); |
| 111 | |
| 112 | error = input_register_device(beeper->input); |
| 113 | if (error) { |
| 114 | dev_err(&pdev->dev, "Failed to register input device: %d\n", error); |
| 115 | goto err_input_free; |
| 116 | } |
| 117 | |
| 118 | platform_set_drvdata(pdev, beeper); |
| 119 | |
| 120 | return 0; |
| 121 | |
| 122 | err_input_free: |
| 123 | input_free_device(beeper->input); |
| 124 | err_pwm_free: |
| 125 | pwm_free(beeper->pwm); |
| 126 | err_free: |
| 127 | kfree(beeper); |
| 128 | |
| 129 | return error; |
| 130 | } |
| 131 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 132 | static int pwm_beeper_remove(struct platform_device *pdev) |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 133 | { |
| 134 | struct pwm_beeper *beeper = platform_get_drvdata(pdev); |
| 135 | |
| 136 | platform_set_drvdata(pdev, NULL); |
| 137 | input_unregister_device(beeper->input); |
| 138 | |
| 139 | pwm_disable(beeper->pwm); |
| 140 | pwm_free(beeper->pwm); |
| 141 | |
| 142 | kfree(beeper); |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | #ifdef CONFIG_PM |
| 148 | static int pwm_beeper_suspend(struct device *dev) |
| 149 | { |
| 150 | struct pwm_beeper *beeper = dev_get_drvdata(dev); |
| 151 | |
| 152 | if (beeper->period) |
| 153 | pwm_disable(beeper->pwm); |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int pwm_beeper_resume(struct device *dev) |
| 159 | { |
| 160 | struct pwm_beeper *beeper = dev_get_drvdata(dev); |
| 161 | |
| 162 | if (beeper->period) { |
| 163 | pwm_config(beeper->pwm, beeper->period / 2, beeper->period); |
| 164 | pwm_enable(beeper->pwm); |
| 165 | } |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops, |
| 171 | pwm_beeper_suspend, pwm_beeper_resume); |
| 172 | |
| 173 | #define PWM_BEEPER_PM_OPS (&pwm_beeper_pm_ops) |
| 174 | #else |
| 175 | #define PWM_BEEPER_PM_OPS NULL |
| 176 | #endif |
| 177 | |
Sascha Hauer | d56a289 | 2012-11-03 12:05:52 -0700 | [diff] [blame] | 178 | #ifdef CONFIG_OF |
| 179 | static const struct of_device_id pwm_beeper_match[] = { |
| 180 | { .compatible = "pwm-beeper", }, |
| 181 | { }, |
| 182 | }; |
| 183 | #endif |
| 184 | |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 185 | static struct platform_driver pwm_beeper_driver = { |
| 186 | .probe = pwm_beeper_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 187 | .remove = pwm_beeper_remove, |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 188 | .driver = { |
| 189 | .name = "pwm-beeper", |
| 190 | .owner = THIS_MODULE, |
| 191 | .pm = PWM_BEEPER_PM_OPS, |
Sascha Hauer | d56a289 | 2012-11-03 12:05:52 -0700 | [diff] [blame] | 192 | .of_match_table = of_match_ptr(pwm_beeper_match), |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 193 | }, |
| 194 | }; |
JJ Ding | 840a746 | 2011-11-29 11:08:40 -0800 | [diff] [blame] | 195 | module_platform_driver(pwm_beeper_driver); |
Lars-Peter Clausen | e22739d | 2010-07-14 00:25:21 -0700 | [diff] [blame] | 196 | |
| 197 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 198 | MODULE_DESCRIPTION("PWM beeper driver"); |
| 199 | MODULE_LICENSE("GPL"); |
| 200 | MODULE_ALIAS("platform:pwm-beeper"); |