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This can be helpful if the beep/bell sound intensity needs to be adapted to the environment of the device. The volume adjustment is done by changing the duty cycle of the pwm signal. This patch adds the sysfs interface with 5 default volume levels (0 - mute, 4 - max. volume). Signed-off-by: Frieder Schrempf --- .../ABI/testing/sysfs-devices-pwm-beeper | 17 ++++ drivers/input/misc/pwm-beeper.c | 83 ++++++++++++++++++- 2 files changed, 99 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/sysfs-devices-pwm-beeper diff --git a/Documentation/ABI/testing/sysfs-devices-pwm-beeper b/Documentation/ABI/testing/sysfs-devices-pwm-beeper new file mode 100644 index 000000000000..d068c5814f48 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-pwm-beeper @@ -0,0 +1,17 @@ +What: /sys/devices/.../pwm-beeper/volume +Date: February 2017 +KernelVersion: +Contact: Frieder Schrempf +Description: + Control the volume of this pwm-beeper. Values + are between 0 and max_volume. This file will also + show the current volume level stored in the driver. + +What: /sys/devices/.../pwm-beeper/max_volume +Date: February 2017 +KernelVersion: +Contact: Frieder Schrempf +Description: + This file shows the maximum volume level that can be + assigned to volume. + diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c index d6b12477748a..fadc73e1c89a 100644 --- a/drivers/input/misc/pwm-beeper.c +++ b/drivers/input/misc/pwm-beeper.c @@ -1,6 +1,10 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2010, Lars-Peter Clausen + * + * Copyright (C) 2016, Frieder Schrempf + * (volume support) + * * PWM beeper driver */ @@ -24,10 +28,61 @@ struct pwm_beeper { unsigned int bell_frequency; bool suspended; bool amplifier_on; + unsigned int volume; + unsigned int *volume_levels; + unsigned int max_volume; }; #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x)) +static ssize_t volume_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pwm_beeper *beeper = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", beeper->volume); +} + +static ssize_t max_volume_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pwm_beeper *beeper = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", beeper->max_volume); +} + +static ssize_t volume_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int rc; + struct pwm_beeper *beeper = dev_get_drvdata(dev); + unsigned int volume; + + rc = kstrtouint(buf, 0, &volume); + if (rc) + return rc; + + if (volume > beeper->max_volume) + return -EINVAL; + pr_debug("set volume to %u\n", volume); + beeper->volume = volume; + + return count; +} + +static DEVICE_ATTR_RW(volume, 0644, volume_show, volume_store); +static DEVICE_ATTR(max_volume, 0644, max_volume_show, NULL); + +static struct attribute *pwm_beeper_attributes[] = { + &dev_attr_volume.attr, + &dev_attr_max_volume.attr, + NULL, +}; + +static struct attribute_group pwm_beeper_attribute_group = { + .attrs = pwm_beeper_attributes, +}; + static int pwm_beeper_on(struct pwm_beeper *beeper, unsigned long period) { struct pwm_state state; @@ -37,7 +92,8 @@ static int pwm_beeper_on(struct pwm_beeper *beeper, unsigned long period) state.enabled = true; state.period = period; - pwm_set_relative_duty_cycle(&state, 50, 100); + + pwm_set_relative_duty_cycle(&state, beeper->volume_levels[beeper->volume], 1000); error = pwm_apply_state(beeper->pwm, &state); if (error) @@ -126,6 +182,7 @@ static int pwm_beeper_probe(struct platform_device *pdev) struct pwm_state state; u32 bell_frequency; int error; + size_t size; beeper = devm_kzalloc(dev, sizeof(*beeper), GFP_KERNEL); if (!beeper) @@ -171,6 +228,24 @@ static int pwm_beeper_probe(struct platform_device *pdev) beeper->bell_frequency = bell_frequency; + beeper->max_volume = 4; + + size = sizeof(*beeper->volume_levels) * + (beeper->max_volume + 1); + + beeper->volume_levels = devm_kzalloc(&(pdev->dev), size, + GFP_KERNEL); + if (!beeper->volume_levels) + return -ENOMEM; + + beeper->volume_levels[0] = 0; + beeper->volume_levels[1] = 8; + beeper->volume_levels[2] = 20; + beeper->volume_levels[3] = 40; + beeper->volume_levels[4] = 500; + + beeper->volume = beeper->max_volume; + beeper->input = devm_input_allocate_device(dev); if (!beeper->input) { dev_err(dev, "Failed to allocate input device\n"); @@ -192,6 +267,12 @@ static int pwm_beeper_probe(struct platform_device *pdev) input_set_drvdata(beeper->input, beeper); + error = sysfs_create_group(&pdev->dev.kobj, &pwm_beeper_attribute_group); + if (error) { + dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", error); + return error; + } + error = input_register_device(beeper->input); if (error) { dev_err(dev, "Failed to register input device: %d\n", error); From patchwork Tue Jan 24 11:13:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manuel Traut X-Patchwork-Id: 13113830 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D6EDC25B4E for ; 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Signed-off-by: Frieder Schrempf Acked-by: Rob Herring --- .../devicetree/bindings/input/pwm-beeper.txt | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/input/pwm-beeper.txt b/Documentation/devicetree/bindings/input/pwm-beeper.txt index 8fc0e48c20db..93cab5eee9f2 100644 --- a/Documentation/devicetree/bindings/input/pwm-beeper.txt +++ b/Documentation/devicetree/bindings/input/pwm-beeper.txt @@ -9,6 +9,15 @@ Required properties: Optional properties: - amp-supply: phandle to a regulator that acts as an amplifier for the beeper - beeper-hz: bell frequency in Hz +- volume-levels: Array of PWM duty cycle values that correspond to + linear volume levels. These need to be in the range of 0 to 500, + while 0 means 0% duty cycle (mute) and 500 means 50% duty cycle + (max volume). + Please note that the actual volume of most beepers is highly + non-linear, which means that low volume levels are probably somewhere + in the range of 1 to 30 (0.1-3% duty cycle). +- default-volume-level: the default volume level (index into the + array defined by the "volume-levels" property) Example: @@ -21,4 +30,6 @@ beeper { compatible = "pwm-beeper"; pwms = <&pwm0>; amp-supply = <&beeper_amp>; + volume-levels = <0 8 20 40 500>; + default-volume-level = <4>; }; From patchwork Tue Jan 24 11:14:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manuel Traut X-Patchwork-Id: 13113833 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB298C25B50 for ; 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Signed-off-by: Frieder Schrempf --- drivers/input/misc/pwm-beeper.c | 58 +++++++++++++++++++++++---------- 1 file changed, 41 insertions(+), 17 deletions(-) diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c index fadc73e1c89a..f95d6b5899c7 100644 --- a/drivers/input/misc/pwm-beeper.c +++ b/drivers/input/misc/pwm-beeper.c @@ -181,8 +181,9 @@ static int pwm_beeper_probe(struct platform_device *pdev) struct pwm_beeper *beeper; struct pwm_state state; u32 bell_frequency; - int error; + int error, length; size_t size; + u32 value; beeper = devm_kzalloc(dev, sizeof(*beeper), GFP_KERNEL); if (!beeper) @@ -228,23 +229,46 @@ static int pwm_beeper_probe(struct platform_device *pdev) beeper->bell_frequency = bell_frequency; - beeper->max_volume = 4; - - size = sizeof(*beeper->volume_levels) * - (beeper->max_volume + 1); - - beeper->volume_levels = devm_kzalloc(&(pdev->dev), size, - GFP_KERNEL); - if (!beeper->volume_levels) - return -ENOMEM; - - beeper->volume_levels[0] = 0; - beeper->volume_levels[1] = 8; - beeper->volume_levels[2] = 20; - beeper->volume_levels[3] = 40; - beeper->volume_levels[4] = 500; + /* determine the number of volume levels */ + length = device_property_read_u32_array(&pdev->dev, "volume-levels", NULL, 0); + if (length <= 0) { + dev_dbg(&pdev->dev, "no volume levels specified, using max volume\n"); + beeper->max_volume = 1; + } else + beeper->max_volume = length; + + /* read volume levels from DT property */ + if (beeper->max_volume > 0) { + size = sizeof(*beeper->volume_levels) * beeper->max_volume; + + beeper->volume_levels = devm_kzalloc(&(pdev->dev), size, + GFP_KERNEL); + if (!beeper->volume_levels) + return -ENOMEM; + + if (length > 0) { + error = device_property_read_u32_array(&pdev->dev, "volume-levels", + beeper->volume_levels, + beeper->max_volume); + + if (error < 0) + return error; + + error = device_property_read_u32(&pdev->dev, "default-volume-level", + &value); + + if (error < 0) { + dev_dbg(&pdev->dev, "no default volume specified, using max volume\n"); + value = beeper->max_volume - 1; + } + } else { + beeper->volume_levels[0] = 500; + value = 0; + } - beeper->volume = beeper->max_volume; + beeper->volume = value; + beeper->max_volume--; + } beeper->input = devm_input_allocate_device(dev); if (!beeper->input) {