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1064 lines
29 KiB
1064 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* AD7190 AD7192 AD7193 AD7195 SPI ADC driver |
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* |
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* Copyright 2011-2015 Analog Devices Inc. |
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*/ |
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|
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#include <linux/interrupt.h> |
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#include <linux/clk.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/sysfs.h> |
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#include <linux/spi/spi.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/err.h> |
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#include <linux/sched.h> |
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#include <linux/delay.h> |
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#include <linux/of_device.h> |
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|
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/trigger.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/iio/adc/ad_sigma_delta.h> |
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/* Registers */ |
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#define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */ |
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#define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */ |
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#define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */ |
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#define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */ |
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#define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */ |
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#define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */ |
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#define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */ |
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#define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit */ |
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/* (AD7792)/24-bit (AD7192)) */ |
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#define AD7192_REG_FULLSALE 7 /* Full-Scale Register */ |
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/* (RW, 16-bit (AD7792)/24-bit (AD7192)) */ |
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|
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/* Communications Register Bit Designations (AD7192_REG_COMM) */ |
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#define AD7192_COMM_WEN BIT(7) /* Write Enable */ |
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#define AD7192_COMM_WRITE 0 /* Write Operation */ |
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#define AD7192_COMM_READ BIT(6) /* Read Operation */ |
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#define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ |
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#define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */ |
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/* Status Register Bit Designations (AD7192_REG_STAT) */ |
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#define AD7192_STAT_RDY BIT(7) /* Ready */ |
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#define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange) */ |
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#define AD7192_STAT_NOREF BIT(5) /* Error no external reference */ |
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#define AD7192_STAT_PARITY BIT(4) /* Parity */ |
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#define AD7192_STAT_CH3 BIT(2) /* Channel 3 */ |
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#define AD7192_STAT_CH2 BIT(1) /* Channel 2 */ |
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#define AD7192_STAT_CH1 BIT(0) /* Channel 1 */ |
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|
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/* Mode Register Bit Designations (AD7192_REG_MODE) */ |
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#define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */ |
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#define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */ |
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#define AD7192_MODE_DAT_STA BIT(20) /* Status Register transmission */ |
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#define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */ |
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#define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */ |
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#define AD7192_MODE_ACX BIT(14) /* AC excitation enable(AD7195 only)*/ |
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#define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */ |
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#define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/ |
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#define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */ |
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#define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */ |
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#define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */ |
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/* Mode Register: AD7192_MODE_SEL options */ |
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#define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */ |
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#define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */ |
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#define AD7192_MODE_IDLE 2 /* Idle Mode */ |
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#define AD7192_MODE_PWRDN 3 /* Power-Down Mode */ |
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#define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ |
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#define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ |
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#define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ |
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#define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ |
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|
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/* Mode Register: AD7192_MODE_CLKSRC options */ |
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#define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected*/ |
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/* from MCLK1 to MCLK2 */ |
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#define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */ |
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#define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not */ |
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/* available at the MCLK2 pin */ |
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#define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available*/ |
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/* at the MCLK2 pin */ |
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/* Configuration Register Bit Designations (AD7192_REG_CONF) */ |
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#define AD7192_CONF_CHOP BIT(23) /* CHOP enable */ |
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#define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference Select */ |
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#define AD7192_CONF_CHAN(x) ((x) << 8) /* Channel select */ |
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#define AD7192_CONF_CHAN_MASK (0x7FF << 8) /* Channel select mask */ |
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#define AD7192_CONF_BURN BIT(7) /* Burnout current enable */ |
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#define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */ |
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#define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */ |
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#define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */ |
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#define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */ |
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#define AD7192_CH_AIN1P_AIN2M BIT(0) /* AIN1(+) - AIN2(-) */ |
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#define AD7192_CH_AIN3P_AIN4M BIT(1) /* AIN3(+) - AIN4(-) */ |
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#define AD7192_CH_TEMP BIT(2) /* Temp Sensor */ |
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#define AD7192_CH_AIN2P_AIN2M BIT(3) /* AIN2(+) - AIN2(-) */ |
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#define AD7192_CH_AIN1 BIT(4) /* AIN1 - AINCOM */ |
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#define AD7192_CH_AIN2 BIT(5) /* AIN2 - AINCOM */ |
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#define AD7192_CH_AIN3 BIT(6) /* AIN3 - AINCOM */ |
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#define AD7192_CH_AIN4 BIT(7) /* AIN4 - AINCOM */ |
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#define AD7193_CH_AIN1P_AIN2M 0x001 /* AIN1(+) - AIN2(-) */ |
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#define AD7193_CH_AIN3P_AIN4M 0x002 /* AIN3(+) - AIN4(-) */ |
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#define AD7193_CH_AIN5P_AIN6M 0x004 /* AIN5(+) - AIN6(-) */ |
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#define AD7193_CH_AIN7P_AIN8M 0x008 /* AIN7(+) - AIN8(-) */ |
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#define AD7193_CH_TEMP 0x100 /* Temp senseor */ |
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#define AD7193_CH_AIN2P_AIN2M 0x200 /* AIN2(+) - AIN2(-) */ |
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#define AD7193_CH_AIN1 0x401 /* AIN1 - AINCOM */ |
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#define AD7193_CH_AIN2 0x402 /* AIN2 - AINCOM */ |
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#define AD7193_CH_AIN3 0x404 /* AIN3 - AINCOM */ |
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#define AD7193_CH_AIN4 0x408 /* AIN4 - AINCOM */ |
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#define AD7193_CH_AIN5 0x410 /* AIN5 - AINCOM */ |
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#define AD7193_CH_AIN6 0x420 /* AIN6 - AINCOM */ |
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#define AD7193_CH_AIN7 0x440 /* AIN7 - AINCOM */ |
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#define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */ |
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#define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */ |
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|
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/* ID Register Bit Designations (AD7192_REG_ID) */ |
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#define CHIPID_AD7190 0x4 |
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#define CHIPID_AD7192 0x0 |
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#define CHIPID_AD7193 0x2 |
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#define CHIPID_AD7195 0x6 |
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#define AD7192_ID_MASK 0x0F |
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/* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */ |
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#define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch enable */ |
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#define AD7192_GPOCON_GP32EN BIT(5) /* Digital Output P3 and P2 enable */ |
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#define AD7192_GPOCON_GP10EN BIT(4) /* Digital Output P1 and P0 enable */ |
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#define AD7192_GPOCON_P3DAT BIT(3) /* P3 state */ |
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#define AD7192_GPOCON_P2DAT BIT(2) /* P2 state */ |
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#define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */ |
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#define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */ |
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#define AD7192_EXT_FREQ_MHZ_MIN 2457600 |
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#define AD7192_EXT_FREQ_MHZ_MAX 5120000 |
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#define AD7192_INT_FREQ_MHZ 4915200 |
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#define AD7192_NO_SYNC_FILTER 1 |
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#define AD7192_SYNC3_FILTER 3 |
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#define AD7192_SYNC4_FILTER 4 |
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|
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/* NOTE: |
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* The AD7190/2/5 features a dual use data out ready DOUT/RDY output. |
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* In order to avoid contentions on the SPI bus, it's therefore necessary |
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* to use spi bus locking. |
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* |
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* The DOUT/RDY output must also be wired to an interrupt capable GPIO. |
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*/ |
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enum { |
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AD7192_SYSCALIB_ZERO_SCALE, |
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AD7192_SYSCALIB_FULL_SCALE, |
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}; |
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enum { |
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ID_AD7190, |
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ID_AD7192, |
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ID_AD7193, |
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ID_AD7195, |
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}; |
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struct ad7192_chip_info { |
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unsigned int chip_id; |
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const char *name; |
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}; |
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struct ad7192_state { |
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const struct ad7192_chip_info *chip_info; |
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struct regulator *avdd; |
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struct regulator *dvdd; |
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struct clk *mclk; |
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u16 int_vref_mv; |
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u32 fclk; |
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u32 f_order; |
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u32 mode; |
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u32 conf; |
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u32 scale_avail[8][2]; |
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u8 gpocon; |
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u8 clock_sel; |
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struct mutex lock; /* protect sensor state */ |
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u8 syscalib_mode[8]; |
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struct ad_sigma_delta sd; |
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}; |
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static const char * const ad7192_syscalib_modes[] = { |
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[AD7192_SYSCALIB_ZERO_SCALE] = "zero_scale", |
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[AD7192_SYSCALIB_FULL_SCALE] = "full_scale", |
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}; |
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static int ad7192_set_syscalib_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, |
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unsigned int mode) |
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{ |
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struct ad7192_state *st = iio_priv(indio_dev); |
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st->syscalib_mode[chan->channel] = mode; |
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return 0; |
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} |
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static int ad7192_get_syscalib_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan) |
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{ |
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struct ad7192_state *st = iio_priv(indio_dev); |
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return st->syscalib_mode[chan->channel]; |
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} |
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static ssize_t ad7192_write_syscalib(struct iio_dev *indio_dev, |
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uintptr_t private, |
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const struct iio_chan_spec *chan, |
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const char *buf, size_t len) |
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{ |
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struct ad7192_state *st = iio_priv(indio_dev); |
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bool sys_calib; |
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int ret, temp; |
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ret = strtobool(buf, &sys_calib); |
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if (ret) |
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return ret; |
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temp = st->syscalib_mode[chan->channel]; |
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if (sys_calib) { |
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if (temp == AD7192_SYSCALIB_ZERO_SCALE) |
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ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_ZERO, |
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chan->address); |
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else |
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ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_FULL, |
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chan->address); |
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} |
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return ret ? ret : len; |
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} |
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static const struct iio_enum ad7192_syscalib_mode_enum = { |
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.items = ad7192_syscalib_modes, |
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.num_items = ARRAY_SIZE(ad7192_syscalib_modes), |
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.set = ad7192_set_syscalib_mode, |
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.get = ad7192_get_syscalib_mode |
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}; |
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static const struct iio_chan_spec_ext_info ad7192_calibsys_ext_info[] = { |
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{ |
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.name = "sys_calibration", |
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.write = ad7192_write_syscalib, |
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.shared = IIO_SEPARATE, |
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}, |
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IIO_ENUM("sys_calibration_mode", IIO_SEPARATE, |
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&ad7192_syscalib_mode_enum), |
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IIO_ENUM_AVAILABLE("sys_calibration_mode", &ad7192_syscalib_mode_enum), |
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{} |
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}; |
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static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd) |
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{ |
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return container_of(sd, struct ad7192_state, sd); |
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} |
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static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel) |
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{ |
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struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); |
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st->conf &= ~AD7192_CONF_CHAN_MASK; |
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st->conf |= AD7192_CONF_CHAN(channel); |
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return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); |
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} |
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static int ad7192_set_mode(struct ad_sigma_delta *sd, |
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enum ad_sigma_delta_mode mode) |
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{ |
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struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); |
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st->mode &= ~AD7192_MODE_SEL_MASK; |
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st->mode |= AD7192_MODE_SEL(mode); |
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return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
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} |
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static const struct ad_sigma_delta_info ad7192_sigma_delta_info = { |
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.set_channel = ad7192_set_channel, |
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.set_mode = ad7192_set_mode, |
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.has_registers = true, |
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.addr_shift = 3, |
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.read_mask = BIT(6), |
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}; |
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static const struct ad_sd_calib_data ad7192_calib_arr[8] = { |
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{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1}, |
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{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1}, |
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{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2}, |
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{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2}, |
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{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3}, |
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{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3}, |
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{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4}, |
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{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4} |
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}; |
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static int ad7192_calibrate_all(struct ad7192_state *st) |
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{ |
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return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr, |
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ARRAY_SIZE(ad7192_calib_arr)); |
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} |
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static inline bool ad7192_valid_external_frequency(u32 freq) |
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{ |
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return (freq >= AD7192_EXT_FREQ_MHZ_MIN && |
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freq <= AD7192_EXT_FREQ_MHZ_MAX); |
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} |
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static int ad7192_of_clock_select(struct ad7192_state *st) |
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{ |
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struct device_node *np = st->sd.spi->dev.of_node; |
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unsigned int clock_sel; |
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clock_sel = AD7192_CLK_INT; |
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/* use internal clock */ |
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if (PTR_ERR(st->mclk) == -ENOENT) { |
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if (of_property_read_bool(np, "adi,int-clock-output-enable")) |
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clock_sel = AD7192_CLK_INT_CO; |
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} else { |
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if (of_property_read_bool(np, "adi,clock-xtal")) |
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clock_sel = AD7192_CLK_EXT_MCLK1_2; |
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else |
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clock_sel = AD7192_CLK_EXT_MCLK2; |
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} |
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return clock_sel; |
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} |
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static int ad7192_setup(struct ad7192_state *st, struct device_node *np) |
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{ |
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struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi); |
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bool rej60_en, refin2_en; |
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bool buf_en, bipolar, burnout_curr_en; |
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unsigned long long scale_uv; |
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int i, ret, id; |
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/* reset the serial interface */ |
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ret = ad_sd_reset(&st->sd, 48); |
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if (ret < 0) |
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return ret; |
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usleep_range(500, 1000); /* Wait for at least 500us */ |
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/* write/read test for device presence */ |
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ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id); |
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if (ret) |
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return ret; |
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id &= AD7192_ID_MASK; |
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if (id != st->chip_info->chip_id) |
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dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n", |
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id); |
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st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) | |
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AD7192_MODE_CLKSRC(st->clock_sel) | |
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AD7192_MODE_RATE(480); |
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st->conf = AD7192_CONF_GAIN(0); |
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rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable"); |
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if (rej60_en) |
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st->mode |= AD7192_MODE_REJ60; |
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refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable"); |
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if (refin2_en && st->chip_info->chip_id != CHIPID_AD7195) |
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st->conf |= AD7192_CONF_REFSEL; |
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st->conf &= ~AD7192_CONF_CHOP; |
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st->f_order = AD7192_NO_SYNC_FILTER; |
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buf_en = of_property_read_bool(np, "adi,buffer-enable"); |
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if (buf_en) |
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st->conf |= AD7192_CONF_BUF; |
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|
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bipolar = of_property_read_bool(np, "bipolar"); |
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if (!bipolar) |
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st->conf |= AD7192_CONF_UNIPOLAR; |
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|
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burnout_curr_en = of_property_read_bool(np, |
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"adi,burnout-currents-enable"); |
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if (burnout_curr_en && buf_en) { |
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st->conf |= AD7192_CONF_BURN; |
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} else if (burnout_curr_en) { |
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dev_warn(&st->sd.spi->dev, |
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"Can't enable burnout currents: see CHOP or buffer\n"); |
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} |
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ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
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if (ret) |
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return ret; |
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ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); |
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if (ret) |
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return ret; |
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|
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ret = ad7192_calibrate_all(st); |
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if (ret) |
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return ret; |
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|
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/* Populate available ADC input ranges */ |
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for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { |
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scale_uv = ((u64)st->int_vref_mv * 100000000) |
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>> (indio_dev->channels[0].scan_type.realbits - |
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((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1)); |
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scale_uv >>= i; |
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|
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st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; |
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st->scale_avail[i][0] = scale_uv; |
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} |
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return 0; |
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} |
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static ssize_t ad7192_show_ac_excitation(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct ad7192_state *st = iio_priv(indio_dev); |
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|
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return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX)); |
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} |
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|
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static ssize_t ad7192_show_bridge_switch(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct ad7192_state *st = iio_priv(indio_dev); |
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|
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return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW)); |
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} |
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|
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static ssize_t ad7192_set(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t len) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct ad7192_state *st = iio_priv(indio_dev); |
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
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int ret; |
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bool val; |
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|
|
ret = strtobool(buf, &val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = iio_device_claim_direct_mode(indio_dev); |
|
if (ret) |
|
return ret; |
|
|
|
switch ((u32)this_attr->address) { |
|
case AD7192_REG_GPOCON: |
|
if (val) |
|
st->gpocon |= AD7192_GPOCON_BPDSW; |
|
else |
|
st->gpocon &= ~AD7192_GPOCON_BPDSW; |
|
|
|
ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon); |
|
break; |
|
case AD7192_REG_MODE: |
|
if (val) |
|
st->mode |= AD7192_MODE_ACX; |
|
else |
|
st->mode &= ~AD7192_MODE_ACX; |
|
|
|
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
} |
|
|
|
iio_device_release_direct_mode(indio_dev); |
|
|
|
return ret ? ret : len; |
|
} |
|
|
|
static void ad7192_get_available_filter_freq(struct ad7192_state *st, |
|
int *freq) |
|
{ |
|
unsigned int fadc; |
|
|
|
/* Formulas for filter at page 25 of the datasheet */ |
|
fadc = DIV_ROUND_CLOSEST(st->fclk, |
|
AD7192_SYNC4_FILTER * AD7192_MODE_RATE(st->mode)); |
|
freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024); |
|
|
|
fadc = DIV_ROUND_CLOSEST(st->fclk, |
|
AD7192_SYNC3_FILTER * AD7192_MODE_RATE(st->mode)); |
|
freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024); |
|
|
|
fadc = DIV_ROUND_CLOSEST(st->fclk, AD7192_MODE_RATE(st->mode)); |
|
freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024); |
|
freq[3] = DIV_ROUND_CLOSEST(fadc * 272, 1024); |
|
} |
|
|
|
static ssize_t ad7192_show_filter_avail(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
|
struct ad7192_state *st = iio_priv(indio_dev); |
|
unsigned int freq_avail[4], i; |
|
size_t len = 0; |
|
|
|
ad7192_get_available_filter_freq(st, freq_avail); |
|
|
|
for (i = 0; i < ARRAY_SIZE(freq_avail); i++) |
|
len += scnprintf(buf + len, PAGE_SIZE - len, |
|
"%d.%d ", freq_avail[i] / 1000, |
|
freq_avail[i] % 1000); |
|
|
|
buf[len - 1] = '\n'; |
|
|
|
return len; |
|
} |
|
|
|
static IIO_DEVICE_ATTR(filter_low_pass_3db_frequency_available, |
|
0444, ad7192_show_filter_avail, NULL, 0); |
|
|
|
static IIO_DEVICE_ATTR(bridge_switch_en, 0644, |
|
ad7192_show_bridge_switch, ad7192_set, |
|
AD7192_REG_GPOCON); |
|
|
|
static IIO_DEVICE_ATTR(ac_excitation_en, 0644, |
|
ad7192_show_ac_excitation, ad7192_set, |
|
AD7192_REG_MODE); |
|
|
|
static struct attribute *ad7192_attributes[] = { |
|
&iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr, |
|
&iio_dev_attr_bridge_switch_en.dev_attr.attr, |
|
&iio_dev_attr_ac_excitation_en.dev_attr.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group ad7192_attribute_group = { |
|
.attrs = ad7192_attributes, |
|
}; |
|
|
|
static struct attribute *ad7195_attributes[] = { |
|
&iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr, |
|
&iio_dev_attr_bridge_switch_en.dev_attr.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group ad7195_attribute_group = { |
|
.attrs = ad7195_attributes, |
|
}; |
|
|
|
static unsigned int ad7192_get_temp_scale(bool unipolar) |
|
{ |
|
return unipolar ? 2815 * 2 : 2815; |
|
} |
|
|
|
static int ad7192_set_3db_filter_freq(struct ad7192_state *st, |
|
int val, int val2) |
|
{ |
|
int freq_avail[4], i, ret, freq; |
|
unsigned int diff_new, diff_old; |
|
int idx = 0; |
|
|
|
diff_old = U32_MAX; |
|
freq = val * 1000 + val2; |
|
|
|
ad7192_get_available_filter_freq(st, freq_avail); |
|
|
|
for (i = 0; i < ARRAY_SIZE(freq_avail); i++) { |
|
diff_new = abs(freq - freq_avail[i]); |
|
if (diff_new < diff_old) { |
|
diff_old = diff_new; |
|
idx = i; |
|
} |
|
} |
|
|
|
switch (idx) { |
|
case 0: |
|
st->f_order = AD7192_SYNC4_FILTER; |
|
st->mode &= ~AD7192_MODE_SINC3; |
|
|
|
st->conf |= AD7192_CONF_CHOP; |
|
break; |
|
case 1: |
|
st->f_order = AD7192_SYNC3_FILTER; |
|
st->mode |= AD7192_MODE_SINC3; |
|
|
|
st->conf |= AD7192_CONF_CHOP; |
|
break; |
|
case 2: |
|
st->f_order = AD7192_NO_SYNC_FILTER; |
|
st->mode &= ~AD7192_MODE_SINC3; |
|
|
|
st->conf &= ~AD7192_CONF_CHOP; |
|
break; |
|
case 3: |
|
st->f_order = AD7192_NO_SYNC_FILTER; |
|
st->mode |= AD7192_MODE_SINC3; |
|
|
|
st->conf &= ~AD7192_CONF_CHOP; |
|
break; |
|
} |
|
|
|
ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); |
|
} |
|
|
|
static int ad7192_get_3db_filter_freq(struct ad7192_state *st) |
|
{ |
|
unsigned int fadc; |
|
|
|
fadc = DIV_ROUND_CLOSEST(st->fclk, |
|
st->f_order * AD7192_MODE_RATE(st->mode)); |
|
|
|
if (st->conf & AD7192_CONF_CHOP) |
|
return DIV_ROUND_CLOSEST(fadc * 240, 1024); |
|
if (st->mode & AD7192_MODE_SINC3) |
|
return DIV_ROUND_CLOSEST(fadc * 272, 1024); |
|
else |
|
return DIV_ROUND_CLOSEST(fadc * 230, 1024); |
|
} |
|
|
|
static int ad7192_read_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int *val, |
|
int *val2, |
|
long m) |
|
{ |
|
struct ad7192_state *st = iio_priv(indio_dev); |
|
bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR); |
|
|
|
switch (m) { |
|
case IIO_CHAN_INFO_RAW: |
|
return ad_sigma_delta_single_conversion(indio_dev, chan, val); |
|
case IIO_CHAN_INFO_SCALE: |
|
switch (chan->type) { |
|
case IIO_VOLTAGE: |
|
mutex_lock(&st->lock); |
|
*val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0]; |
|
*val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1]; |
|
mutex_unlock(&st->lock); |
|
return IIO_VAL_INT_PLUS_NANO; |
|
case IIO_TEMP: |
|
*val = 0; |
|
*val2 = 1000000000 / ad7192_get_temp_scale(unipolar); |
|
return IIO_VAL_INT_PLUS_NANO; |
|
default: |
|
return -EINVAL; |
|
} |
|
case IIO_CHAN_INFO_OFFSET: |
|
if (!unipolar) |
|
*val = -(1 << (chan->scan_type.realbits - 1)); |
|
else |
|
*val = 0; |
|
/* Kelvin to Celsius */ |
|
if (chan->type == IIO_TEMP) |
|
*val -= 273 * ad7192_get_temp_scale(unipolar); |
|
return IIO_VAL_INT; |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
*val = st->fclk / |
|
(st->f_order * 1024 * AD7192_MODE_RATE(st->mode)); |
|
return IIO_VAL_INT; |
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: |
|
*val = ad7192_get_3db_filter_freq(st); |
|
*val2 = 1000; |
|
return IIO_VAL_FRACTIONAL; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static int ad7192_write_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int val, |
|
int val2, |
|
long mask) |
|
{ |
|
struct ad7192_state *st = iio_priv(indio_dev); |
|
int ret, i, div; |
|
unsigned int tmp; |
|
|
|
ret = iio_device_claim_direct_mode(indio_dev); |
|
if (ret) |
|
return ret; |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_SCALE: |
|
ret = -EINVAL; |
|
mutex_lock(&st->lock); |
|
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) |
|
if (val2 == st->scale_avail[i][1]) { |
|
ret = 0; |
|
tmp = st->conf; |
|
st->conf &= ~AD7192_CONF_GAIN(-1); |
|
st->conf |= AD7192_CONF_GAIN(i); |
|
if (tmp == st->conf) |
|
break; |
|
ad_sd_write_reg(&st->sd, AD7192_REG_CONF, |
|
3, st->conf); |
|
ad7192_calibrate_all(st); |
|
break; |
|
} |
|
mutex_unlock(&st->lock); |
|
break; |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
if (!val) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
div = st->fclk / (val * st->f_order * 1024); |
|
if (div < 1 || div > 1023) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
st->mode &= ~AD7192_MODE_RATE(-1); |
|
st->mode |= AD7192_MODE_RATE(div); |
|
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
|
break; |
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: |
|
ret = ad7192_set_3db_filter_freq(st, val, val2 / 1000); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
} |
|
|
|
iio_device_release_direct_mode(indio_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
long mask) |
|
{ |
|
switch (mask) { |
|
case IIO_CHAN_INFO_SCALE: |
|
return IIO_VAL_INT_PLUS_NANO; |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
return IIO_VAL_INT; |
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int ad7192_read_avail(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
const int **vals, int *type, int *length, |
|
long mask) |
|
{ |
|
struct ad7192_state *st = iio_priv(indio_dev); |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_SCALE: |
|
*vals = (int *)st->scale_avail; |
|
*type = IIO_VAL_INT_PLUS_NANO; |
|
/* Values are stored in a 2D matrix */ |
|
*length = ARRAY_SIZE(st->scale_avail) * 2; |
|
|
|
return IIO_AVAIL_LIST; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static const struct iio_info ad7192_info = { |
|
.read_raw = ad7192_read_raw, |
|
.write_raw = ad7192_write_raw, |
|
.write_raw_get_fmt = ad7192_write_raw_get_fmt, |
|
.read_avail = ad7192_read_avail, |
|
.attrs = &ad7192_attribute_group, |
|
.validate_trigger = ad_sd_validate_trigger, |
|
}; |
|
|
|
static const struct iio_info ad7195_info = { |
|
.read_raw = ad7192_read_raw, |
|
.write_raw = ad7192_write_raw, |
|
.write_raw_get_fmt = ad7192_write_raw_get_fmt, |
|
.read_avail = ad7192_read_avail, |
|
.attrs = &ad7195_attribute_group, |
|
.validate_trigger = ad_sd_validate_trigger, |
|
}; |
|
|
|
#define __AD719x_CHANNEL(_si, _channel1, _channel2, _address, _extend_name, \ |
|
_type, _mask_type_av, _ext_info) \ |
|
{ \ |
|
.type = (_type), \ |
|
.differential = ((_channel2) == -1 ? 0 : 1), \ |
|
.indexed = 1, \ |
|
.channel = (_channel1), \ |
|
.channel2 = (_channel2), \ |
|
.address = (_address), \ |
|
.extend_name = (_extend_name), \ |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
|
BIT(IIO_CHAN_INFO_OFFSET), \ |
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ |
|
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ |
|
.info_mask_shared_by_type_available = (_mask_type_av), \ |
|
.ext_info = (_ext_info), \ |
|
.scan_index = (_si), \ |
|
.scan_type = { \ |
|
.sign = 'u', \ |
|
.realbits = 24, \ |
|
.storagebits = 32, \ |
|
.endianness = IIO_BE, \ |
|
}, \ |
|
} |
|
|
|
#define AD719x_DIFF_CHANNEL(_si, _channel1, _channel2, _address) \ |
|
__AD719x_CHANNEL(_si, _channel1, _channel2, _address, NULL, \ |
|
IIO_VOLTAGE, BIT(IIO_CHAN_INFO_SCALE), \ |
|
ad7192_calibsys_ext_info) |
|
|
|
#define AD719x_CHANNEL(_si, _channel1, _address) \ |
|
__AD719x_CHANNEL(_si, _channel1, -1, _address, NULL, IIO_VOLTAGE, \ |
|
BIT(IIO_CHAN_INFO_SCALE), ad7192_calibsys_ext_info) |
|
|
|
#define AD719x_SHORTED_CHANNEL(_si, _channel1, _address) \ |
|
__AD719x_CHANNEL(_si, _channel1, -1, _address, "shorted", IIO_VOLTAGE, \ |
|
BIT(IIO_CHAN_INFO_SCALE), ad7192_calibsys_ext_info) |
|
|
|
#define AD719x_TEMP_CHANNEL(_si, _address) \ |
|
__AD719x_CHANNEL(_si, 0, -1, _address, NULL, IIO_TEMP, 0, NULL) |
|
|
|
static const struct iio_chan_spec ad7192_channels[] = { |
|
AD719x_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M), |
|
AD719x_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M), |
|
AD719x_TEMP_CHANNEL(2, AD7192_CH_TEMP), |
|
AD719x_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M), |
|
AD719x_CHANNEL(4, 1, AD7192_CH_AIN1), |
|
AD719x_CHANNEL(5, 2, AD7192_CH_AIN2), |
|
AD719x_CHANNEL(6, 3, AD7192_CH_AIN3), |
|
AD719x_CHANNEL(7, 4, AD7192_CH_AIN4), |
|
IIO_CHAN_SOFT_TIMESTAMP(8), |
|
}; |
|
|
|
static const struct iio_chan_spec ad7193_channels[] = { |
|
AD719x_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M), |
|
AD719x_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M), |
|
AD719x_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M), |
|
AD719x_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M), |
|
AD719x_TEMP_CHANNEL(4, AD7193_CH_TEMP), |
|
AD719x_SHORTED_CHANNEL(5, 2, AD7193_CH_AIN2P_AIN2M), |
|
AD719x_CHANNEL(6, 1, AD7193_CH_AIN1), |
|
AD719x_CHANNEL(7, 2, AD7193_CH_AIN2), |
|
AD719x_CHANNEL(8, 3, AD7193_CH_AIN3), |
|
AD719x_CHANNEL(9, 4, AD7193_CH_AIN4), |
|
AD719x_CHANNEL(10, 5, AD7193_CH_AIN5), |
|
AD719x_CHANNEL(11, 6, AD7193_CH_AIN6), |
|
AD719x_CHANNEL(12, 7, AD7193_CH_AIN7), |
|
AD719x_CHANNEL(13, 8, AD7193_CH_AIN8), |
|
IIO_CHAN_SOFT_TIMESTAMP(14), |
|
}; |
|
|
|
static const struct ad7192_chip_info ad7192_chip_info_tbl[] = { |
|
[ID_AD7190] = { |
|
.chip_id = CHIPID_AD7190, |
|
.name = "ad7190", |
|
}, |
|
[ID_AD7192] = { |
|
.chip_id = CHIPID_AD7192, |
|
.name = "ad7192", |
|
}, |
|
[ID_AD7193] = { |
|
.chip_id = CHIPID_AD7193, |
|
.name = "ad7193", |
|
}, |
|
[ID_AD7195] = { |
|
.chip_id = CHIPID_AD7195, |
|
.name = "ad7195", |
|
}, |
|
}; |
|
|
|
static int ad7192_channels_config(struct iio_dev *indio_dev) |
|
{ |
|
struct ad7192_state *st = iio_priv(indio_dev); |
|
|
|
switch (st->chip_info->chip_id) { |
|
case CHIPID_AD7193: |
|
indio_dev->channels = ad7193_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(ad7193_channels); |
|
break; |
|
default: |
|
indio_dev->channels = ad7192_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(ad7192_channels); |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ad7192_probe(struct spi_device *spi) |
|
{ |
|
struct ad7192_state *st; |
|
struct iio_dev *indio_dev; |
|
int ret, voltage_uv = 0; |
|
|
|
if (!spi->irq) { |
|
dev_err(&spi->dev, "no IRQ?\n"); |
|
return -ENODEV; |
|
} |
|
|
|
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
|
if (!indio_dev) |
|
return -ENOMEM; |
|
|
|
st = iio_priv(indio_dev); |
|
|
|
mutex_init(&st->lock); |
|
|
|
st->avdd = devm_regulator_get(&spi->dev, "avdd"); |
|
if (IS_ERR(st->avdd)) |
|
return PTR_ERR(st->avdd); |
|
|
|
ret = regulator_enable(st->avdd); |
|
if (ret) { |
|
dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); |
|
return ret; |
|
} |
|
|
|
st->dvdd = devm_regulator_get(&spi->dev, "dvdd"); |
|
if (IS_ERR(st->dvdd)) { |
|
ret = PTR_ERR(st->dvdd); |
|
goto error_disable_avdd; |
|
} |
|
|
|
ret = regulator_enable(st->dvdd); |
|
if (ret) { |
|
dev_err(&spi->dev, "Failed to enable specified DVdd supply\n"); |
|
goto error_disable_avdd; |
|
} |
|
|
|
voltage_uv = regulator_get_voltage(st->avdd); |
|
|
|
if (voltage_uv > 0) { |
|
st->int_vref_mv = voltage_uv / 1000; |
|
} else { |
|
ret = voltage_uv; |
|
dev_err(&spi->dev, "Device tree error, reference voltage undefined\n"); |
|
goto error_disable_avdd; |
|
} |
|
|
|
spi_set_drvdata(spi, indio_dev); |
|
st->chip_info = of_device_get_match_data(&spi->dev); |
|
indio_dev->name = st->chip_info->name; |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
|
|
ret = ad7192_channels_config(indio_dev); |
|
if (ret < 0) |
|
goto error_disable_dvdd; |
|
|
|
if (st->chip_info->chip_id == CHIPID_AD7195) |
|
indio_dev->info = &ad7195_info; |
|
else |
|
indio_dev->info = &ad7192_info; |
|
|
|
ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info); |
|
|
|
ret = ad_sd_setup_buffer_and_trigger(indio_dev); |
|
if (ret) |
|
goto error_disable_dvdd; |
|
|
|
st->fclk = AD7192_INT_FREQ_MHZ; |
|
|
|
st->mclk = devm_clk_get(&st->sd.spi->dev, "mclk"); |
|
if (IS_ERR(st->mclk) && PTR_ERR(st->mclk) != -ENOENT) { |
|
ret = PTR_ERR(st->mclk); |
|
goto error_remove_trigger; |
|
} |
|
|
|
st->clock_sel = ad7192_of_clock_select(st); |
|
|
|
if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 || |
|
st->clock_sel == AD7192_CLK_EXT_MCLK2) { |
|
ret = clk_prepare_enable(st->mclk); |
|
if (ret < 0) |
|
goto error_remove_trigger; |
|
|
|
st->fclk = clk_get_rate(st->mclk); |
|
if (!ad7192_valid_external_frequency(st->fclk)) { |
|
ret = -EINVAL; |
|
dev_err(&spi->dev, |
|
"External clock frequency out of bounds\n"); |
|
goto error_disable_clk; |
|
} |
|
} |
|
|
|
ret = ad7192_setup(st, spi->dev.of_node); |
|
if (ret) |
|
goto error_disable_clk; |
|
|
|
ret = iio_device_register(indio_dev); |
|
if (ret < 0) |
|
goto error_disable_clk; |
|
return 0; |
|
|
|
error_disable_clk: |
|
clk_disable_unprepare(st->mclk); |
|
error_remove_trigger: |
|
ad_sd_cleanup_buffer_and_trigger(indio_dev); |
|
error_disable_dvdd: |
|
regulator_disable(st->dvdd); |
|
error_disable_avdd: |
|
regulator_disable(st->avdd); |
|
|
|
return ret; |
|
} |
|
|
|
static int ad7192_remove(struct spi_device *spi) |
|
{ |
|
struct iio_dev *indio_dev = spi_get_drvdata(spi); |
|
struct ad7192_state *st = iio_priv(indio_dev); |
|
|
|
iio_device_unregister(indio_dev); |
|
clk_disable_unprepare(st->mclk); |
|
ad_sd_cleanup_buffer_and_trigger(indio_dev); |
|
|
|
regulator_disable(st->dvdd); |
|
regulator_disable(st->avdd); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id ad7192_of_match[] = { |
|
{ .compatible = "adi,ad7190", .data = &ad7192_chip_info_tbl[ID_AD7190] }, |
|
{ .compatible = "adi,ad7192", .data = &ad7192_chip_info_tbl[ID_AD7192] }, |
|
{ .compatible = "adi,ad7193", .data = &ad7192_chip_info_tbl[ID_AD7193] }, |
|
{ .compatible = "adi,ad7195", .data = &ad7192_chip_info_tbl[ID_AD7195] }, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(of, ad7192_of_match); |
|
|
|
static struct spi_driver ad7192_driver = { |
|
.driver = { |
|
.name = "ad7192", |
|
.of_match_table = ad7192_of_match, |
|
}, |
|
.probe = ad7192_probe, |
|
.remove = ad7192_remove, |
|
}; |
|
module_spi_driver(ad7192_driver); |
|
|
|
MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
|
MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC"); |
|
MODULE_LICENSE("GPL v2");
|
|
|