On 19.01.2017 22:30, Dmitry Torokhov wrote:
On Thu, Jan 19, 2017 at 04:24:10PM +0100, Frieder Schrempf wrote:This patch adds the devicetree bindings to set the volume levels and the default volume level. Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxx> --- Changes in v3: - none drivers/input/misc/pwm-beeper.c | 49 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 46 insertions(+), 3 deletions(-) diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c index 3ed21da..a7f9d70 100644 --- a/drivers/input/misc/pwm-beeper.c +++ b/drivers/input/misc/pwm-beeper.c @@ -32,7 +32,7 @@ struct pwm_beeper { struct work_struct work; unsigned long period; unsigned int volume; - unsigned int volume_levels[] = {0, 8, 20, 40, 500}; + unsigned int *volume_levels; unsigned int max_volume_level; }; @@ -161,8 +161,11 @@ static void pwm_beeper_close(struct input_dev *input) static int pwm_beeper_probe(struct platform_device *pdev) { unsigned long pwm_id = (unsigned long)dev_get_platdata(&pdev->dev); + struct device_node *np = pdev->dev.of_node; struct pwm_beeper *beeper; - int error; + struct property *prop; + int error, length; + u32 value; beeper = kzalloc(sizeof(*beeper), GFP_KERNEL); if (!beeper) @@ -188,7 +191,47 @@ static int pwm_beeper_probe(struct platform_device *pdev) INIT_WORK(&beeper->work, pwm_beeper_work); - beeper->max_volume_level = ARRAY_SIZE(beeper->volume_levels) - 1; + /* determine the number of volume levels */ + prop = of_find_property(np, "volume-levels", &length);Please use generic device properties, not OF-specific ones.
Ok, I will change this in v4.
+ if (!prop) { + dev_dbg(&pdev->dev, "no volume levels specified, using max volume\n"); + beeper->max_volume_level = 1; + } else + beeper->max_volume_level = length / sizeof(u32); + + /* read volume levels from DT property */ + if (beeper->max_volume_level > 0) { + size_t size = sizeof(*beeper->volume_levels) * + beeper->max_volume_level; + + beeper->volume_levels = devm_kzalloc(&(pdev->dev), size, + GFP_KERNEL); + if (!beeper->volume_levels) + return -ENOMEM; + + if (prop) { + error = of_property_read_u32_array(np, "volume-levels", + beeper->volume_levels, + beeper->max_volume_level); + + if (error < 0) + return error; + + error = of_property_read_u32(np, "default-volume-level", + &value); + + if (error < 0) { + dev_dbg(&pdev->dev, "no default volume specified, using max volume\n"); + value = beeper->max_volume_level - 1; + } + } else { + beeper->volume_levels[0] = 500; + value = 0; + } + + beeper->volume = value; + beeper->max_volume_level--; + } beeper->input = input_allocate_device(); if (!beeper->input) { -- 2.7.4
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