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![Alexandru Ardelean](/assets/img/avatar_default.png)
The change is more cosmetic. There is no need to reference this table in the probe function since 'of_device_get_match_data' is used, which obtains this information from the driver object. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
1064 lines
29 KiB
C
1064 lines
29 KiB
C
// 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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#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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#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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/* 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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/* 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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/* 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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/* 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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/* 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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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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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);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ad7192_calibrate_all(st);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Populate available ADC input ranges */
|
|
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
|
|
scale_uv = ((u64)st->int_vref_mv * 100000000)
|
|
>> (indio_dev->channels[0].scan_type.realbits -
|
|
((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
|
|
scale_uv >>= i;
|
|
|
|
st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
|
|
st->scale_avail[i][0] = scale_uv;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ad7192_show_ac_excitation(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);
|
|
|
|
return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX));
|
|
}
|
|
|
|
static ssize_t ad7192_show_bridge_switch(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);
|
|
|
|
return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
|
|
}
|
|
|
|
static ssize_t ad7192_set(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ad7192_state *st = iio_priv(indio_dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int ret;
|
|
bool val;
|
|
|
|
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 <michael.hennerich@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
|
|
MODULE_LICENSE("GPL v2");
|