1 // SPDX-License-Identifier: GPL-2.0+
10 #include <sandbox-adc.h>
13  * struct sandbox_adc_priv - sandbox ADC device's operation status and data
15  * @conversion_status - conversion status: ACTIVE (started) / INACTIVE (stopped)
16  * @conversion_mode   - conversion mode: single or multi-channel
17  * @active_channel    - active channel number, valid for single channel mode
18  * data[]             - channels data
27 int sandbox_adc_start_channel(struct udevice *dev, int channel)  in sandbox_adc_start_channel()  argument
31 	/* Set single-channel mode */  in sandbox_adc_start_channel()
32 	priv->conversion_mode = SANDBOX_ADC_MODE_SINGLE_CHANNEL;  in sandbox_adc_start_channel()
33 	/* Select channel */  in sandbox_adc_start_channel()
34 	priv->active_channel_mask = 1 << channel;  in sandbox_adc_start_channel()
36 	priv->conversion_status = SANDBOX_ADC_ACTIVE;  in sandbox_adc_start_channel()
45 	/* Set single-channel mode */  in sandbox_adc_start_channels()
46 	priv->conversion_mode = SANDBOX_ADC_MODE_MULTI_CHANNEL;  in sandbox_adc_start_channels()
47 	/* Select channel */  in sandbox_adc_start_channels()
48 	priv->active_channel_mask = channel_mask;  in sandbox_adc_start_channels()
50 	priv->conversion_status = SANDBOX_ADC_ACTIVE;  in sandbox_adc_start_channels()
55 int sandbox_adc_channel_data(struct udevice *dev, int channel,  in sandbox_adc_channel_data()  argument
60 	/* For single-channel conversion mode, check if channel was selected */  in sandbox_adc_channel_data()
61 	if ((priv->conversion_mode == SANDBOX_ADC_MODE_SINGLE_CHANNEL) &&  in sandbox_adc_channel_data()
62 	    !(priv->active_channel_mask & (1 << channel))) {  in sandbox_adc_channel_data()
63 		pr_err("Request for an inactive channel!");  in sandbox_adc_channel_data()
64 		return -EINVAL;  in sandbox_adc_channel_data()
68 	if (priv->conversion_status == SANDBOX_ADC_INACTIVE)  in sandbox_adc_channel_data()
69 		return -EIO;  in sandbox_adc_channel_data()
71 	*data = priv->data[channel];  in sandbox_adc_channel_data()
82 	/* Return error for single-channel conversion mode */  in sandbox_adc_channels_data()
83 	if (priv->conversion_mode == SANDBOX_ADC_MODE_SINGLE_CHANNEL) {  in sandbox_adc_channels_data()
84 		pr_err("ADC in single-channel mode!");  in sandbox_adc_channels_data()
85 		return -EPERM;  in sandbox_adc_channels_data()
87 	/* Check channel selection */  in sandbox_adc_channels_data()
88 	if (!(priv->active_channel_mask & channel_mask)) {  in sandbox_adc_channels_data()
89 		pr_err("Request for an inactive channel!");  in sandbox_adc_channels_data()
90 		return -EINVAL;  in sandbox_adc_channels_data()
93 	if (priv->conversion_status == SANDBOX_ADC_INACTIVE)  in sandbox_adc_channels_data()
94 		return -EIO;  in sandbox_adc_channels_data()
100 		channels->data = priv->data[i];  in sandbox_adc_channels_data()
101 		channels->id = i;  in sandbox_adc_channels_data()
113 	priv->conversion_status = SANDBOX_ADC_INACTIVE;  in sandbox_adc_stop()
123 	priv->conversion_status = SANDBOX_ADC_INACTIVE;  in sandbox_adc_probe()
124 	/* Set single-channel mode */  in sandbox_adc_probe()
125 	priv->conversion_mode = SANDBOX_ADC_MODE_SINGLE_CHANNEL;  in sandbox_adc_probe()
127 	priv->active_channel_mask = 0;  in sandbox_adc_probe()
130 	priv->data[0] = SANDBOX_ADC_CHANNEL0_DATA;  in sandbox_adc_probe()
131 	priv->data[1] = SANDBOX_ADC_CHANNEL1_DATA;  in sandbox_adc_probe()
132 	priv->data[2] = SANDBOX_ADC_CHANNEL2_DATA;  in sandbox_adc_probe()
133 	priv->data[3] = SANDBOX_ADC_CHANNEL3_DATA;  in sandbox_adc_probe()
142 	uc_pdata->data_mask = SANDBOX_ADC_DATA_MASK;  in sandbox_adc_ofdata_to_platdata()
143 	uc_pdata->data_format = ADC_DATA_FORMAT_BIN;  in sandbox_adc_ofdata_to_platdata()
144 	uc_pdata->data_timeout_us = 0;  in sandbox_adc_ofdata_to_platdata()
146 	/* Mask available channel bits: [0:3] */  in sandbox_adc_ofdata_to_platdata()
147 	uc_pdata->channel_mask = (1 << SANDBOX_ADC_CHANNELS) - 1;  in sandbox_adc_ofdata_to_platdata()
166 	.name		= "sandbox-adc",