340 lines
8.9 KiB
C
340 lines
8.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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//
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// ALSA SoC glue to use IIO devices as audio components
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//
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// Copyright 2023 CS GROUP France
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//
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// Author: Herve Codina <herve.codina@bootlin.com>
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#include <linux/iio/consumer.h>
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#include <linux/minmax.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/string_helpers.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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struct audio_iio_aux_chan {
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struct iio_channel *iio_chan;
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const char *name;
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int max;
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int min;
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bool is_invert_range;
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};
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struct audio_iio_aux {
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struct device *dev;
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unsigned int num_chans;
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struct audio_iio_aux_chan chans[] __counted_by(num_chans);
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};
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static int audio_iio_aux_info_volsw(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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struct audio_iio_aux_chan *chan = (struct audio_iio_aux_chan *)kcontrol->private_value;
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uinfo->count = 1;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = chan->max - chan->min;
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uinfo->type = (uinfo->value.integer.max == 1) ?
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SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
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return 0;
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}
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static int audio_iio_aux_get_volsw(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct audio_iio_aux_chan *chan = (struct audio_iio_aux_chan *)kcontrol->private_value;
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int max = chan->max;
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int min = chan->min;
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bool invert_range = chan->is_invert_range;
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int ret;
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int val;
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ret = iio_read_channel_raw(chan->iio_chan, &val);
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if (ret < 0)
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return ret;
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ucontrol->value.integer.value[0] = val - min;
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if (invert_range)
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ucontrol->value.integer.value[0] = max - ucontrol->value.integer.value[0];
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return 0;
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}
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static int audio_iio_aux_put_volsw(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct audio_iio_aux_chan *chan = (struct audio_iio_aux_chan *)kcontrol->private_value;
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int max = chan->max;
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int min = chan->min;
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bool invert_range = chan->is_invert_range;
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int val;
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int ret;
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int tmp;
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val = ucontrol->value.integer.value[0];
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if (val < 0)
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return -EINVAL;
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if (val > max - min)
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return -EINVAL;
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val = val + min;
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if (invert_range)
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val = max - val;
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ret = iio_read_channel_raw(chan->iio_chan, &tmp);
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if (ret < 0)
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return ret;
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if (tmp == val)
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return 0;
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ret = iio_write_channel_raw(chan->iio_chan, val);
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if (ret)
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return ret;
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return 1; /* The value changed */
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}
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static int audio_iio_aux_add_controls(struct snd_soc_component *component,
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struct audio_iio_aux_chan *chan)
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{
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struct snd_kcontrol_new control = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = chan->name,
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.info = audio_iio_aux_info_volsw,
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.get = audio_iio_aux_get_volsw,
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.put = audio_iio_aux_put_volsw,
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.private_value = (unsigned long)chan,
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};
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return snd_soc_add_component_controls(component, &control, 1);
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}
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/*
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* These data could be on stack but they are pretty big.
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* As ASoC internally copy them and protect them against concurrent accesses
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* (snd_soc_bind_card() protects using client_mutex), keep them in the global
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* data area.
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*/
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static struct snd_soc_dapm_widget widgets[3];
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static struct snd_soc_dapm_route routes[2];
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/* Be sure sizes are correct (need 3 widgets and 2 routes) */
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static_assert(ARRAY_SIZE(widgets) >= 3, "3 widgets are needed");
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static_assert(ARRAY_SIZE(routes) >= 2, "2 routes are needed");
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static int audio_iio_aux_add_dapms(struct snd_soc_component *component,
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struct audio_iio_aux_chan *chan)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
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char *output_name;
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char *input_name;
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char *pga_name;
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int ret;
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input_name = kasprintf(GFP_KERNEL, "%s IN", chan->name);
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if (!input_name)
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return -ENOMEM;
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output_name = kasprintf(GFP_KERNEL, "%s OUT", chan->name);
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if (!output_name) {
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ret = -ENOMEM;
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goto out_free_input_name;
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}
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pga_name = kasprintf(GFP_KERNEL, "%s PGA", chan->name);
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if (!pga_name) {
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ret = -ENOMEM;
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goto out_free_output_name;
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}
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widgets[0] = SND_SOC_DAPM_INPUT(input_name);
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widgets[1] = SND_SOC_DAPM_OUTPUT(output_name);
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widgets[2] = SND_SOC_DAPM_PGA(pga_name, SND_SOC_NOPM, 0, 0, NULL, 0);
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ret = snd_soc_dapm_new_controls(dapm, widgets, 3);
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if (ret)
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goto out_free_pga_name;
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routes[0].sink = pga_name;
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routes[0].control = NULL;
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routes[0].source = input_name;
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routes[1].sink = output_name;
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routes[1].control = NULL;
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routes[1].source = pga_name;
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ret = snd_soc_dapm_add_routes(dapm, routes, 2);
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/* Allocated names are no more needed (duplicated in ASoC internals) */
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out_free_pga_name:
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kfree(pga_name);
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out_free_output_name:
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kfree(output_name);
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out_free_input_name:
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kfree(input_name);
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return ret;
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}
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static int audio_iio_aux_component_probe(struct snd_soc_component *component)
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{
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struct audio_iio_aux *iio_aux = snd_soc_component_get_drvdata(component);
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struct audio_iio_aux_chan *chan;
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int ret;
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int i;
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for (i = 0; i < iio_aux->num_chans; i++) {
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chan = iio_aux->chans + i;
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ret = iio_read_max_channel_raw(chan->iio_chan, &chan->max);
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if (ret)
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return dev_err_probe(component->dev, ret,
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"chan[%d] %s: Cannot get max raw value\n",
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i, chan->name);
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ret = iio_read_min_channel_raw(chan->iio_chan, &chan->min);
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if (ret)
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return dev_err_probe(component->dev, ret,
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"chan[%d] %s: Cannot get min raw value\n",
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i, chan->name);
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if (chan->min > chan->max) {
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/*
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* This should never happen but to avoid any check
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* later, just swap values here to ensure that the
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* minimum value is lower than the maximum value.
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*/
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dev_dbg(component->dev, "chan[%d] %s: Swap min and max\n",
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i, chan->name);
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swap(chan->min, chan->max);
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}
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/* Set initial value */
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ret = iio_write_channel_raw(chan->iio_chan,
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chan->is_invert_range ? chan->max : chan->min);
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if (ret)
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return dev_err_probe(component->dev, ret,
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"chan[%d] %s: Cannot set initial value\n",
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i, chan->name);
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ret = audio_iio_aux_add_controls(component, chan);
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if (ret)
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return ret;
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ret = audio_iio_aux_add_dapms(component, chan);
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if (ret)
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return ret;
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dev_dbg(component->dev, "chan[%d]: Added %s (min=%d, max=%d, invert=%s)\n",
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i, chan->name, chan->min, chan->max,
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str_on_off(chan->is_invert_range));
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}
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return 0;
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}
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static const struct snd_soc_component_driver audio_iio_aux_component_driver = {
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.probe = audio_iio_aux_component_probe,
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};
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static int audio_iio_aux_probe(struct platform_device *pdev)
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{
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struct audio_iio_aux_chan *iio_aux_chan;
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struct device *dev = &pdev->dev;
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struct audio_iio_aux *iio_aux;
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const char **names;
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u32 *invert_ranges;
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int count;
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int ret;
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int i;
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count = device_property_string_array_count(dev, "io-channel-names");
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if (count < 0)
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return dev_err_probe(dev, count, "failed to count io-channel-names\n");
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iio_aux = devm_kzalloc(dev, struct_size(iio_aux, chans, count), GFP_KERNEL);
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if (!iio_aux)
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return -ENOMEM;
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iio_aux->dev = dev;
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iio_aux->num_chans = count;
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names = kcalloc(iio_aux->num_chans, sizeof(*names), GFP_KERNEL);
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if (!names)
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return -ENOMEM;
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invert_ranges = kcalloc(iio_aux->num_chans, sizeof(*invert_ranges), GFP_KERNEL);
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if (!invert_ranges) {
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ret = -ENOMEM;
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goto out_free_names;
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}
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ret = device_property_read_string_array(dev, "io-channel-names",
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names, iio_aux->num_chans);
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if (ret < 0) {
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dev_err_probe(dev, ret, "failed to read io-channel-names\n");
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goto out_free_invert_ranges;
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}
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/*
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* snd-control-invert-range is optional and can contain fewer items
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* than the number of channels. Unset values default to 0.
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*/
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count = device_property_count_u32(dev, "snd-control-invert-range");
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if (count > 0) {
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count = min_t(unsigned int, count, iio_aux->num_chans);
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ret = device_property_read_u32_array(dev, "snd-control-invert-range",
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invert_ranges, count);
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if (ret < 0) {
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dev_err_probe(dev, ret, "failed to read snd-control-invert-range\n");
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goto out_free_invert_ranges;
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}
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}
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for (i = 0; i < iio_aux->num_chans; i++) {
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iio_aux_chan = iio_aux->chans + i;
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iio_aux_chan->name = names[i];
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iio_aux_chan->is_invert_range = invert_ranges[i];
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iio_aux_chan->iio_chan = devm_iio_channel_get(dev, iio_aux_chan->name);
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if (IS_ERR(iio_aux_chan->iio_chan)) {
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ret = PTR_ERR(iio_aux_chan->iio_chan);
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dev_err_probe(dev, ret, "get IIO channel '%s' failed\n",
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iio_aux_chan->name);
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goto out_free_invert_ranges;
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}
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}
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platform_set_drvdata(pdev, iio_aux);
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ret = devm_snd_soc_register_component(dev, &audio_iio_aux_component_driver,
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NULL, 0);
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out_free_invert_ranges:
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kfree(invert_ranges);
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out_free_names:
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kfree(names);
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return ret;
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}
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static const struct of_device_id audio_iio_aux_ids[] = {
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{ .compatible = "audio-iio-aux" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, audio_iio_aux_ids);
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static struct platform_driver audio_iio_aux_driver = {
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.driver = {
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.name = "audio-iio-aux",
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.of_match_table = audio_iio_aux_ids,
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},
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.probe = audio_iio_aux_probe,
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};
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module_platform_driver(audio_iio_aux_driver);
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MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
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MODULE_DESCRIPTION("IIO ALSA SoC aux driver");
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MODULE_LICENSE("GPL");
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