eb90c92bb7
Add IOCTL to initialize the I2C expander and SPI initialization for ADS ADC. Clients issue a request to initialize and enable the device before issuing requests to perform an ADC read. The file interface is necessary since it takes considerable amount of time to initialize the I2C expander and the ADS ADC device for every ADC read transaction. Change-Id: I9e830232592288cbc41554070c70882f05c842ce Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/*
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* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __EPM_ADC_H
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#define __EPM_ADC_H
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#include <linux/i2c.h>
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struct epm_chan_request {
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/* EPM ADC device index. 0 - ADC1, 1 - ADC2 */
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uint32_t device_idx;
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/* Channel number within the EPM ADC device */
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uint32_t channel_idx;
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/* The data meaningful for each individual channel whether it is
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* voltage, current etc. */
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int32_t physical;
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};
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struct epm_chan_properties {
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uint32_t resistorValue;
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uint32_t gain;
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};
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struct epm_adc_platform_data {
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struct epm_chan_properties *channel;
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uint32_t num_channels;
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uint32_t num_adc;
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uint32_t chan_per_adc;
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uint32_t chan_per_mux;
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struct i2c_board_info epm_i2c_board_info;
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uint32_t bus_id;
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uint32_t gpio_expander_base_addr;
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};
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#define EPM_ADC_IOCTL_CODE 0x91
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#define EPM_ADC_REQUEST _IOWR(EPM_ADC_IOCTL_CODE, 1, \
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struct epm_chan_request)
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#define EPM_ADC_INIT _IOR(EPM_ADC_IOCTL_CODE, 2, \
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uint32_t)
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#define EPM_ADC_DEINIT _IOR(EPM_ADC_IOCTL_CODE, 3, \
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uint32_t)
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#endif /* __EPM_ADC_H */
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