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path: root/drivers/input/misc/pwm-beeper.c
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Diffstat (limited to 'drivers/input/misc/pwm-beeper.c')
-rw-r--r--drivers/input/misc/pwm-beeper.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c
new file mode 100644
index 000000000..e82edf810
--- /dev/null
+++ b/drivers/input/misc/pwm-beeper.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ * PWM beeper driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+struct pwm_beeper {
+ struct input_dev *input;
+ struct pwm_device *pwm;
+ unsigned long period;
+};
+
+#define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))
+
+static int pwm_beeper_event(struct input_dev *input,
+ unsigned int type, unsigned int code, int value)
+{
+ int ret = 0;
+ struct pwm_beeper *beeper = input_get_drvdata(input);
+ unsigned long period;
+
+ if (type != EV_SND || value < 0)
+ return -EINVAL;
+
+ switch (code) {
+ case SND_BELL:
+ value = value ? 1000 : 0;
+ break;
+ case SND_TONE:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (value == 0) {
+ pwm_disable(beeper->pwm);
+ } else {
+ period = HZ_TO_NANOSECONDS(value);
+ ret = pwm_config(beeper->pwm, period / 2, period);
+ if (ret)
+ return ret;
+ ret = pwm_enable(beeper->pwm);
+ if (ret)
+ return ret;
+ beeper->period = period;
+ }
+
+ return 0;
+}
+
+static int pwm_beeper_probe(struct platform_device *pdev)
+{
+ unsigned long pwm_id = (unsigned long)dev_get_platdata(&pdev->dev);
+ struct pwm_beeper *beeper;
+ int error;
+
+ beeper = kzalloc(sizeof(*beeper), GFP_KERNEL);
+ if (!beeper)
+ return -ENOMEM;
+
+ beeper->pwm = pwm_get(&pdev->dev, NULL);
+ if (IS_ERR(beeper->pwm)) {
+ dev_dbg(&pdev->dev, "unable to request PWM, trying legacy API\n");
+ beeper->pwm = pwm_request(pwm_id, "pwm beeper");
+ }
+
+ if (IS_ERR(beeper->pwm)) {
+ error = PTR_ERR(beeper->pwm);
+ dev_err(&pdev->dev, "Failed to request pwm device: %d\n", error);
+ goto err_free;
+ }
+
+ beeper->input = input_allocate_device();
+ if (!beeper->input) {
+ dev_err(&pdev->dev, "Failed to allocate input device\n");
+ error = -ENOMEM;
+ goto err_pwm_free;
+ }
+ beeper->input->dev.parent = &pdev->dev;
+
+ beeper->input->name = "pwm-beeper";
+ beeper->input->phys = "pwm/input0";
+ beeper->input->id.bustype = BUS_HOST;
+ beeper->input->id.vendor = 0x001f;
+ beeper->input->id.product = 0x0001;
+ beeper->input->id.version = 0x0100;
+
+ beeper->input->evbit[0] = BIT(EV_SND);
+ beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL);
+
+ beeper->input->event = pwm_beeper_event;
+
+ input_set_drvdata(beeper->input, beeper);
+
+ error = input_register_device(beeper->input);
+ if (error) {
+ dev_err(&pdev->dev, "Failed to register input device: %d\n", error);
+ goto err_input_free;
+ }
+
+ platform_set_drvdata(pdev, beeper);
+
+ return 0;
+
+err_input_free:
+ input_free_device(beeper->input);
+err_pwm_free:
+ pwm_free(beeper->pwm);
+err_free:
+ kfree(beeper);
+
+ return error;
+}
+
+static int pwm_beeper_remove(struct platform_device *pdev)
+{
+ struct pwm_beeper *beeper = platform_get_drvdata(pdev);
+
+ input_unregister_device(beeper->input);
+
+ pwm_disable(beeper->pwm);
+ pwm_free(beeper->pwm);
+
+ kfree(beeper);
+
+ return 0;
+}
+
+static int __maybe_unused pwm_beeper_suspend(struct device *dev)
+{
+ struct pwm_beeper *beeper = dev_get_drvdata(dev);
+
+ if (beeper->period)
+ pwm_disable(beeper->pwm);
+
+ return 0;
+}
+
+static int __maybe_unused pwm_beeper_resume(struct device *dev)
+{
+ struct pwm_beeper *beeper = dev_get_drvdata(dev);
+
+ if (beeper->period) {
+ pwm_config(beeper->pwm, beeper->period / 2, beeper->period);
+ pwm_enable(beeper->pwm);
+ }
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops,
+ pwm_beeper_suspend, pwm_beeper_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pwm_beeper_match[] = {
+ { .compatible = "pwm-beeper", },
+ { },
+};
+#endif
+
+static struct platform_driver pwm_beeper_driver = {
+ .probe = pwm_beeper_probe,
+ .remove = pwm_beeper_remove,
+ .driver = {
+ .name = "pwm-beeper",
+ .pm = &pwm_beeper_pm_ops,
+ .of_match_table = of_match_ptr(pwm_beeper_match),
+ },
+};
+module_platform_driver(pwm_beeper_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("PWM beeper driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pwm-beeper");