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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
174 lines
4.5 KiB
C
174 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Samsung Electronics
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* Przemyslaw Marczak <p.marczak@samsung.com>
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*/
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#include <common.h>
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#include <errno.h>
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#include <dm.h>
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#include <adc.h>
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#include <sandbox-adc.h>
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/**
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* struct sandbox_adc_priv - sandbox ADC device's operation status and data
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*
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* @conversion_status - conversion status: ACTIVE (started) / INACTIVE (stopped)
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* @conversion_mode - conversion mode: single or multi-channel
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* @active_channel - active channel number, valid for single channel mode
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* data[] - channels data
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*/
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struct sandbox_adc_priv {
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int conversion_status;
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int conversion_mode;
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int active_channel_mask;
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unsigned int data[4];
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};
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int sandbox_adc_start_channel(struct udevice *dev, int channel)
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{
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struct sandbox_adc_priv *priv = dev_get_priv(dev);
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/* Set single-channel mode */
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priv->conversion_mode = SANDBOX_ADC_MODE_SINGLE_CHANNEL;
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/* Select channel */
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priv->active_channel_mask = 1 << channel;
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/* Start conversion */
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priv->conversion_status = SANDBOX_ADC_ACTIVE;
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return 0;
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}
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int sandbox_adc_start_channels(struct udevice *dev, unsigned int channel_mask)
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{
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struct sandbox_adc_priv *priv = dev_get_priv(dev);
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/* Set single-channel mode */
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priv->conversion_mode = SANDBOX_ADC_MODE_MULTI_CHANNEL;
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/* Select channel */
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priv->active_channel_mask = channel_mask;
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/* Start conversion */
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priv->conversion_status = SANDBOX_ADC_ACTIVE;
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return 0;
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}
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int sandbox_adc_channel_data(struct udevice *dev, int channel,
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unsigned int *data)
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{
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struct sandbox_adc_priv *priv = dev_get_priv(dev);
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/* For single-channel conversion mode, check if channel was selected */
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if ((priv->conversion_mode == SANDBOX_ADC_MODE_SINGLE_CHANNEL) &&
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!(priv->active_channel_mask & (1 << channel))) {
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pr_err("Request for an inactive channel!");
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return -EINVAL;
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}
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/* The conversion must be started before reading the data */
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if (priv->conversion_status == SANDBOX_ADC_INACTIVE)
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return -EIO;
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*data = priv->data[channel];
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return 0;
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}
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int sandbox_adc_channels_data(struct udevice *dev, unsigned int channel_mask,
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struct adc_channel *channels)
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{
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struct sandbox_adc_priv *priv = dev_get_priv(dev);
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int i;
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/* Return error for single-channel conversion mode */
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if (priv->conversion_mode == SANDBOX_ADC_MODE_SINGLE_CHANNEL) {
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pr_err("ADC in single-channel mode!");
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return -EPERM;
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}
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/* Check channel selection */
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if (!(priv->active_channel_mask & channel_mask)) {
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pr_err("Request for an inactive channel!");
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return -EINVAL;
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}
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/* The conversion must be started before reading the data */
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if (priv->conversion_status == SANDBOX_ADC_INACTIVE)
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return -EIO;
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for (i = 0; i < SANDBOX_ADC_CHANNELS; i++) {
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if (!((channel_mask >> i) & 0x1))
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continue;
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channels->data = priv->data[i];
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channels->id = i;
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channels++;
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}
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return 0;
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}
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int sandbox_adc_stop(struct udevice *dev)
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{
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struct sandbox_adc_priv *priv = dev_get_priv(dev);
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/* Start conversion */
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priv->conversion_status = SANDBOX_ADC_INACTIVE;
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return 0;
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}
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int sandbox_adc_probe(struct udevice *dev)
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{
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struct sandbox_adc_priv *priv = dev_get_priv(dev);
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/* Stop conversion */
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priv->conversion_status = SANDBOX_ADC_INACTIVE;
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/* Set single-channel mode */
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priv->conversion_mode = SANDBOX_ADC_MODE_SINGLE_CHANNEL;
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/* Deselect all channels */
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priv->active_channel_mask = 0;
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/* Set sandbox test data */
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priv->data[0] = SANDBOX_ADC_CHANNEL0_DATA;
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priv->data[1] = SANDBOX_ADC_CHANNEL1_DATA;
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priv->data[2] = SANDBOX_ADC_CHANNEL2_DATA;
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priv->data[3] = SANDBOX_ADC_CHANNEL3_DATA;
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return 0;
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}
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int sandbox_adc_ofdata_to_platdata(struct udevice *dev)
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{
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struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
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uc_pdata->data_mask = SANDBOX_ADC_DATA_MASK;
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uc_pdata->data_format = ADC_DATA_FORMAT_BIN;
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uc_pdata->data_timeout_us = 0;
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/* Mask available channel bits: [0:3] */
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uc_pdata->channel_mask = (1 << SANDBOX_ADC_CHANNELS) - 1;
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return 0;
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}
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static const struct adc_ops sandbox_adc_ops = {
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.start_channel = sandbox_adc_start_channel,
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.start_channels = sandbox_adc_start_channels,
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.channel_data = sandbox_adc_channel_data,
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.channels_data = sandbox_adc_channels_data,
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.stop = sandbox_adc_stop,
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};
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static const struct udevice_id sandbox_adc_ids[] = {
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{ .compatible = "sandbox,adc" },
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{ }
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};
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U_BOOT_DRIVER(sandbox_adc) = {
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.name = "sandbox-adc",
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.id = UCLASS_ADC,
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.of_match = sandbox_adc_ids,
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.ops = &sandbox_adc_ops,
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.probe = sandbox_adc_probe,
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.ofdata_to_platdata = sandbox_adc_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct sandbox_adc_priv),
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};
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