diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.35/107-pwm-beeper.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.35/107-pwm-beeper.patch | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.35/107-pwm-beeper.patch b/target/linux/xburst/patches-2.6.35/107-pwm-beeper.patch new file mode 100644 index 0000000000..9ed00231b3 --- /dev/null +++ b/target/linux/xburst/patches-2.6.35/107-pwm-beeper.patch @@ -0,0 +1,249 @@ +From d7894c598e2c1e5c1d173ca808694de523f1a06a Mon Sep 17 00:00:00 2001 +From: Lars-Peter Clausen <lars@metafoo.de> +Date: Wed, 14 Jul 2010 00:25:21 -0700 +Subject: [PATCH] Input: Add pwm beeper driver + +This patch adds a simple driver which allows to use pwm based beepers (for +example piezo elements) as a pcspkr-like device. + +Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> +Signed-off-by: Dmitry Torokhov <dtor@mail.ru> +--- + drivers/input/misc/Kconfig | 11 ++ + drivers/input/misc/Makefile | 1 + + drivers/input/misc/pwm-beeper.c | 199 +++++++++++++++++++++++++++++++++++++++ + 3 files changed, 211 insertions(+), 0 deletions(-) + create mode 100644 drivers/input/misc/pwm-beeper.c + +--- a/drivers/input/misc/Kconfig ++++ b/drivers/input/misc/Kconfig +@@ -327,6 +327,17 @@ config INPUT_PCF8574 + To compile this driver as a module, choose M here: the + module will be called pcf8574_keypad. + ++config INPUT_PWM_BEEPER ++ tristate "PWM beeper support" ++ depends on HAVE_PWM ++ help ++ Say Y here to get support for PWM based beeper devices. ++ ++ If unsure, say N. ++ ++ To compile this driver as a module, choose M here: the module will be ++ called pwm-beeper. ++ + config INPUT_GPIO_ROTARY_ENCODER + tristate "Rotary encoders connected to GPIO pins" + depends on GPIOLIB && GENERIC_GPIO +--- a/drivers/input/misc/Makefile ++++ b/drivers/input/misc/Makefile +@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf5 + obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o + obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o + obj-$(CONFIG_INPUT_POWERMATE) += powermate.o ++obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o + obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o + obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o + obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o +--- /dev/null ++++ b/drivers/input/misc/pwm-beeper.c +@@ -0,0 +1,199 @@ ++/* ++ * 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/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_config(beeper->pwm, 0, 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 __devinit pwm_beeper_probe(struct platform_device *pdev) ++{ ++ unsigned long pwm_id = (unsigned long)pdev->dev.platform_data; ++ struct pwm_beeper *beeper; ++ int error; ++ ++ beeper = kzalloc(sizeof(*beeper), GFP_KERNEL); ++ if (!beeper) ++ return -ENOMEM; ++ ++ 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 __devexit pwm_beeper_remove(struct platform_device *pdev) ++{ ++ struct pwm_beeper *beeper = platform_get_drvdata(pdev); ++ ++ platform_set_drvdata(pdev, NULL); ++ input_unregister_device(beeper->input); ++ ++ pwm_disable(beeper->pwm); ++ pwm_free(beeper->pwm); ++ ++ kfree(beeper); ++ ++ return 0; ++} ++ ++#ifdef CONFIG_PM ++static int 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 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); ++ ++#define PWM_BEEPER_PM_OPS (&pwm_beeper_pm_ops) ++#else ++#define PWM_BEEPER_PM_OPS NULL ++#endif ++ ++static struct platform_driver pwm_beeper_driver = { ++ .probe = pwm_beeper_probe, ++ .remove = __devexit_p(pwm_beeper_remove), ++ .driver = { ++ .name = "pwm-beeper", ++ .owner = THIS_MODULE, ++ .pm = PWM_BEEPER_PM_OPS, ++ }, ++}; ++ ++static int __init pwm_beeper_init(void) ++{ ++ return platform_driver_register(&pwm_beeper_driver); ++} ++module_init(pwm_beeper_init); ++ ++static void __exit pwm_beeper_exit(void) ++{ ++ platform_driver_unregister(&pwm_beeper_driver); ++} ++module_exit(pwm_beeper_exit); ++ ++MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); ++MODULE_DESCRIPTION("PWM beeper driver"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("platform:pwm-beeper"); |