mirror of https://gitee.com/openkylin/linux.git
Staging: IIO: DAC: AD5624R: Update to IIO ABI
This driver did not conform with the IIO ABI for such devices. Also the sysfs files that this driver adds were not complete and partially un-documented. Update and document ABI Change License notice, stick to GPL-v2. Fix indention style Add option to specify external reference voltage via the regulator framework. Add mandatory name attribute Add mandatory out_scale attribute Changes since V1: Refine outY_powerdown_mode description Remove bonus white line Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich
Greg Kroah-Hartman
parent
1f0e427007
commit
14f88f1b07
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@ -271,6 +271,38 @@ Description:
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where a single output sets the value for multiple channels
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simultaneously.
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What: /sys/bus/iio/devices/deviceX/outY_powerdown_mode
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What: /sys/bus/iio/devices/deviceX/out_powerdown_mode
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KernelVersion: 2.6.38
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Contact: linux-iio@vger.kernel.org
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Description:
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Specifies the output powerdown mode.
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DAC output stage is disconnected from the amplifier and
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1kohm_to_gnd: connected to ground via an 1kOhm resistor
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100kohm_to_gnd: connected to ground via an 100kOhm resistor
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three_state: left floating
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For a list of available output power down options read
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outX_powerdown_mode_available. If Y is not present the
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mode is shared across all outputs.
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What: /sys/bus/iio/devices/deviceX/outY_powerdown_mode_available
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What: /sys/bus/iio/devices/deviceX/out_powerdown_mode_available
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KernelVersion: 2.6.38
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Contact: linux-iio@vger.kernel.org
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Description:
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Lists all available output power down modes.
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If Y is not present the mode is shared across all outputs.
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What: /sys/bus/iio/devices/deviceX/outY_powerdown
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What: /sys/bus/iio/devices/deviceX/out_powerdown
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KernelVersion: 2.6.38
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Contact: linux-iio@vger.kernel.org
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Description:
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Writing 1 causes output Y to enter the power down mode specified
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by the corresponding outY_powerdown_mode. Clearing returns to
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normal operation. Y may be suppressed if all outputs are
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controlled together.
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What: /sys/bus/iio/devices/deviceX/deviceX:eventY
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KernelVersion: 2.6.35
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Contact: linux-iio@vger.kernel.org
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@ -1,21 +1,80 @@
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/*
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* AD5624R SPI DAC driver
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*
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* Copyright 2010-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#ifndef SPI_AD5624R_H_
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#define SPI_AD5624R_H_
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#define AD5624R_DAC_CHANNELS 4
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#define AD5624R_DAC_CHANNELS 4
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#define AD5624R_ADDR_DAC0 0x0
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#define AD5624R_ADDR_DAC1 0x1
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#define AD5624R_ADDR_DAC2 0x2
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#define AD5624R_ADDR_DAC3 0x3
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#define AD5624R_ADDR_ALL_DAC 0x7
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#define AD5624R_ADDR_DAC0 0x0
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#define AD5624R_ADDR_DAC1 0x1
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#define AD5624R_ADDR_DAC2 0x2
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#define AD5624R_ADDR_DAC3 0x3
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#define AD5624R_ADDR_ALL_DAC 0x7
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#define AD5624R_CMD_WRITE_INPUT_N 0x0
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#define AD5624R_CMD_UPDATE_DAC_N 0x1
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#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2
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#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_N 0x3
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#define AD5624R_CMD_POWERDOWN_DAC 0x4
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#define AD5624R_CMD_RESET 0x5
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#define AD5624R_CMD_LDAC_SETUP 0x6
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#define AD5624R_CMD_INTERNAL_REFER_SETUP 0x7
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#define AD5624R_CMD_WRITE_INPUT_N 0x0
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#define AD5624R_CMD_UPDATE_DAC_N 0x1
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#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2
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#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_N 0x3
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#define AD5624R_CMD_POWERDOWN_DAC 0x4
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#define AD5624R_CMD_RESET 0x5
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#define AD5624R_CMD_LDAC_SETUP 0x6
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#define AD5624R_CMD_INTERNAL_REFER_SETUP 0x7
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#endif
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#define AD5624R_LDAC_PWRDN_NONE 0x0
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#define AD5624R_LDAC_PWRDN_1K 0x1
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#define AD5624R_LDAC_PWRDN_100K 0x2
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#define AD5624R_LDAC_PWRDN_3STATE 0x3
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/**
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* struct ad5624r_chip_info - chip specific information
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* @bits: accuracy of the DAC in bits
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* @int_vref_mv: AD5620/40/60: the internal reference voltage
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*/
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struct ad5624r_chip_info {
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u8 bits;
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u16 int_vref_mv;
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};
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/**
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* struct ad5446_state - driver instance specific data
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* @indio_dev: the industrial I/O device
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* @us: spi_device
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* @chip_info: chip model specific constants, available modes etc
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* @reg: supply regulator
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* @vref_mv: actual reference voltage used
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* @pwr_down_mask power down mask
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* @pwr_down_mode current power down mode
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*/
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struct ad5624r_state {
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struct iio_dev *indio_dev;
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struct spi_device *us;
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const struct ad5624r_chip_info *chip_info;
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struct regulator *reg;
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unsigned short vref_mv;
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unsigned pwr_down_mask;
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unsigned pwr_down_mode;
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};
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/**
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* ad5624r_supported_device_ids:
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* The AD5624/44/64 parts are available in different
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* fixed internal reference voltage options.
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*/
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enum ad5624r_supported_device_ids {
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ID_AD5624R3,
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ID_AD5644R3,
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ID_AD5664R3,
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ID_AD5624R5,
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ID_AD5644R5,
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ID_AD5664R5,
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};
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#endif /* SPI_AD5624R_H_ */
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@ -1,9 +1,9 @@
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/*
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* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
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*
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* Copyright 2010 Analog Devices Inc.
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* Copyright 2010-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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@ -14,25 +14,38 @@
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "dac.h"
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#include "ad5624r.h"
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/**
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* struct ad5624r_state - device related storage
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* @indio_dev: associated industrial IO device
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* @us: spi device
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**/
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struct ad5624r_state {
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struct iio_dev *indio_dev;
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struct spi_device *us;
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int data_len;
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int ldac_mode;
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int dac_power_mode[AD5624R_DAC_CHANNELS];
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int internal_ref;
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static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
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[ID_AD5624R3] = {
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.bits = 12,
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.int_vref_mv = 1250,
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},
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[ID_AD5644R3] = {
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.bits = 14,
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.int_vref_mv = 1250,
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},
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[ID_AD5664R3] = {
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.bits = 16,
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.int_vref_mv = 1250,
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},
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[ID_AD5624R5] = {
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.bits = 12,
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.int_vref_mv = 2500,
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},
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[ID_AD5644R5] = {
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.bits = 14,
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.int_vref_mv = 2500,
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},
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[ID_AD5664R5] = {
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.bits = 16,
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.int_vref_mv = 2500,
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},
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};
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static int ad5624r_spi_write(struct spi_device *spi,
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@ -42,11 +55,12 @@ static int ad5624r_spi_write(struct spi_device *spi,
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u8 msg[3];
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/*
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* The input shift register is 24 bits wide. The first two bits are don't care bits.
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* The next three are the command bits, C2 to C0, followed by the 3-bit DAC address,
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* A2 to A0, and then the 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
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* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, for the AD5664R,
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* AD5644R, and AD5624R, respectively.
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* The input shift register is 24 bits wide. The first two bits are
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* don't care bits. The next three are the command bits, C2 to C0,
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* followed by the 3-bit DAC address, A2 to A0, and then the
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* 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
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* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
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* for the AD5664R, AD5644R, and AD5624R, respectively.
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*/
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data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
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msg[0] = data >> 16;
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@ -71,40 +85,43 @@ static ssize_t ad5624r_write_dac(struct device *dev,
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return ret;
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ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
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this_attr->address, readin, st->data_len);
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this_attr->address, readin,
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st->chip_info->bits);
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return ret ? ret : len;
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}
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static ssize_t ad5624r_read_ldac_mode(struct device *dev,
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static ssize_t ad5624r_read_powerdown_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5624r_state *st = indio_dev->dev_data;
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return sprintf(buf, "%x\n", st->ldac_mode);
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char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
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return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
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}
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static ssize_t ad5624r_write_ldac_mode(struct device *dev,
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static ssize_t ad5624r_write_powerdown_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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long readin;
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int ret;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5624r_state *st = indio_dev->dev_data;
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int ret;
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ret = strict_strtol(buf, 16, &readin);
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if (ret)
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return ret;
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ret = ad5624r_spi_write(st->us, AD5624R_CMD_LDAC_SETUP, 0,
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readin & 0xF, 16);
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st->ldac_mode = readin & 0xF;
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if (sysfs_streq(buf, "1kohm_to_gnd"))
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st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
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else if (sysfs_streq(buf, "100kohm_to_gnd"))
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st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
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else if (sysfs_streq(buf, "three_state"))
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st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE;
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else
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ret = -EINVAL;
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return ret ? ret : len;
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}
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static ssize_t ad5624r_read_dac_power_mode(struct device *dev,
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static ssize_t ad5624r_read_dac_powerdown(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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@ -112,10 +129,11 @@ static ssize_t ad5624r_read_dac_power_mode(struct device *dev,
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struct ad5624r_state *st = indio_dev->dev_data;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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return sprintf(buf, "%d\n", st->dac_power_mode[this_attr->address]);
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return sprintf(buf, "%d\n",
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!!(st->pwr_down_mask & (1 << this_attr->address)));
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}
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static ssize_t ad5624r_write_dac_power_mode(struct device *dev,
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static ssize_t ad5624r_write_dac_powerdown(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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@ -129,80 +147,82 @@ static ssize_t ad5624r_write_dac_power_mode(struct device *dev,
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if (ret)
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return ret;
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if (readin == 1)
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st->pwr_down_mask |= (1 << this_attr->address);
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else if (!readin)
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st->pwr_down_mask &= ~(1 << this_attr->address);
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else
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ret = -EINVAL;
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ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
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((readin & 0x3) << 4) |
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(1 << this_attr->address), 16);
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st->dac_power_mode[this_attr->address] = readin & 0x3;
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(st->pwr_down_mode << 4) |
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st->pwr_down_mask, 16);
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return ret ? ret : len;
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}
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static ssize_t ad5624r_read_internal_ref_mode(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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static ssize_t ad5624r_show_scale(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_get_drvdata(dev);
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struct ad5624r_state *st = indio_dev->dev_data;
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad5624r_state *st = iio_dev_get_devdata(dev_info);
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/* Corresponds to Vref / 2^(bits) */
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unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
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return sprintf(buf, "%d\n", st->internal_ref);
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return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
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}
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static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5624r_show_scale, NULL, 0);
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static ssize_t ad5624r_write_internal_ref_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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static ssize_t ad5624r_show_name(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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long readin;
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int ret;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5624r_state *st = indio_dev->dev_data;
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad5624r_state *st = iio_dev_get_devdata(dev_info);
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ret = strict_strtol(buf, 10, &readin);
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if (ret)
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return ret;
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ret = ad5624r_spi_write(st->us, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
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!!readin, 16);
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st->internal_ref = !!readin;
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return ret ? ret : len;
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return sprintf(buf, "%s\n", spi_get_device_id(st->us)->name);
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}
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static IIO_DEVICE_ATTR(name, S_IRUGO, ad5624r_show_name, NULL, 0);
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static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
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static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
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static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
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static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);
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static IIO_DEVICE_ATTR(ldac_mode, S_IRUGO | S_IWUSR, ad5624r_read_ldac_mode,
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ad5624r_write_ldac_mode, 0);
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static IIO_DEVICE_ATTR(internal_ref, S_IRUGO | S_IWUSR,
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ad5624r_read_internal_ref_mode,
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ad5624r_write_internal_ref_mode, 0);
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static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO |
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S_IWUSR, ad5624r_read_powerdown_mode,
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ad5624r_write_powerdown_mode, 0);
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#define IIO_DEV_ATTR_DAC_POWER_MODE(_num, _show, _store, _addr) \
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IIO_DEVICE_ATTR(dac_power_mode_##_num, S_IRUGO | S_IWUSR, _show, _store, _addr)
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static IIO_CONST_ATTR(out_powerdown_mode_available,
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"1kohm_to_gnd 100kohm_to_gnd three_state");
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static IIO_DEV_ATTR_DAC_POWER_MODE(0, ad5624r_read_dac_power_mode,
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ad5624r_write_dac_power_mode, 0);
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static IIO_DEV_ATTR_DAC_POWER_MODE(1, ad5624r_read_dac_power_mode,
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ad5624r_write_dac_power_mode, 1);
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static IIO_DEV_ATTR_DAC_POWER_MODE(2, ad5624r_read_dac_power_mode,
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ad5624r_write_dac_power_mode, 2);
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static IIO_DEV_ATTR_DAC_POWER_MODE(3, ad5624r_read_dac_power_mode,
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ad5624r_write_dac_power_mode, 3);
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#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
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IIO_DEVICE_ATTR(out##_num##_powerdown, \
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S_IRUGO | S_IWUSR, _show, _store, _addr)
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static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown,
|
||||
ad5624r_write_dac_powerdown, 0);
|
||||
static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
|
||||
ad5624r_write_dac_powerdown, 1);
|
||||
static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
|
||||
ad5624r_write_dac_powerdown, 2);
|
||||
static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
|
||||
ad5624r_write_dac_powerdown, 3);
|
||||
|
||||
static struct attribute *ad5624r_attributes[] = {
|
||||
&iio_dev_attr_out0_raw.dev_attr.attr,
|
||||
&iio_dev_attr_out1_raw.dev_attr.attr,
|
||||
&iio_dev_attr_out2_raw.dev_attr.attr,
|
||||
&iio_dev_attr_out3_raw.dev_attr.attr,
|
||||
&iio_dev_attr_dac_power_mode_0.dev_attr.attr,
|
||||
&iio_dev_attr_dac_power_mode_1.dev_attr.attr,
|
||||
&iio_dev_attr_dac_power_mode_2.dev_attr.attr,
|
||||
&iio_dev_attr_dac_power_mode_3.dev_attr.attr,
|
||||
&iio_dev_attr_ldac_mode.dev_attr.attr,
|
||||
&iio_dev_attr_internal_ref.dev_attr.attr,
|
||||
&iio_dev_attr_out0_powerdown.dev_attr.attr,
|
||||
&iio_dev_attr_out1_powerdown.dev_attr.attr,
|
||||
&iio_dev_attr_out2_powerdown.dev_attr.attr,
|
||||
&iio_dev_attr_out3_powerdown.dev_attr.attr,
|
||||
&iio_dev_attr_out_powerdown_mode.dev_attr.attr,
|
||||
&iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
|
||||
&iio_dev_attr_out_scale.dev_attr.attr,
|
||||
&iio_dev_attr_name.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
|
|
@ -213,7 +233,7 @@ static const struct attribute_group ad5624r_attribute_group = {
|
|||
static int __devinit ad5624r_probe(struct spi_device *spi)
|
||||
{
|
||||
struct ad5624r_state *st;
|
||||
int ret = 0;
|
||||
int ret, voltage_uv = 0;
|
||||
|
||||
st = kzalloc(sizeof(*st), GFP_KERNEL);
|
||||
if (st == NULL) {
|
||||
|
|
@ -222,18 +242,30 @@ static int __devinit ad5624r_probe(struct spi_device *spi)
|
|||
}
|
||||
spi_set_drvdata(spi, st);
|
||||
|
||||
st->data_len = spi_get_device_id(spi)->driver_data;
|
||||
st->reg = regulator_get(&spi->dev, "vcc");
|
||||
if (!IS_ERR(st->reg)) {
|
||||
ret = regulator_enable(st->reg);
|
||||
if (ret)
|
||||
goto error_put_reg;
|
||||
|
||||
voltage_uv = regulator_get_voltage(st->reg);
|
||||
}
|
||||
|
||||
st->chip_info =
|
||||
&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
|
||||
|
||||
if (voltage_uv)
|
||||
st->vref_mv = voltage_uv / 1000;
|
||||
else
|
||||
st->vref_mv = st->chip_info->int_vref_mv;
|
||||
|
||||
st->us = spi;
|
||||
st->indio_dev = iio_allocate_device();
|
||||
if (st->indio_dev == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto error_free_st;
|
||||
goto error_disable_reg;
|
||||
}
|
||||
st->indio_dev->dev.parent = &spi->dev;
|
||||
st->indio_dev->num_interrupt_lines = 0;
|
||||
st->indio_dev->event_attrs = NULL;
|
||||
|
||||
st->indio_dev->attrs = &ad5624r_attribute_group;
|
||||
st->indio_dev->dev_data = (void *)(st);
|
||||
st->indio_dev->driver_module = THIS_MODULE;
|
||||
|
|
@ -243,14 +275,22 @@ static int __devinit ad5624r_probe(struct spi_device *spi)
|
|||
if (ret)
|
||||
goto error_free_dev;
|
||||
|
||||
spi->mode = SPI_MODE_0;
|
||||
spi_setup(spi);
|
||||
ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
|
||||
!!voltage_uv, 16);
|
||||
if (ret)
|
||||
goto error_free_dev;
|
||||
|
||||
return 0;
|
||||
|
||||
error_free_dev:
|
||||
iio_free_device(st->indio_dev);
|
||||
error_free_st:
|
||||
error_disable_reg:
|
||||
if (!IS_ERR(st->reg))
|
||||
regulator_disable(st->reg);
|
||||
error_put_reg:
|
||||
if (!IS_ERR(st->reg))
|
||||
regulator_put(st->reg);
|
||||
|
||||
kfree(st);
|
||||
error_ret:
|
||||
return ret;
|
||||
|
|
@ -261,15 +301,24 @@ static int __devexit ad5624r_remove(struct spi_device *spi)
|
|||
struct ad5624r_state *st = spi_get_drvdata(spi);
|
||||
|
||||
iio_device_unregister(st->indio_dev);
|
||||
|
||||
if (!IS_ERR(st->reg)) {
|
||||
regulator_disable(st->reg);
|
||||
regulator_put(st->reg);
|
||||
}
|
||||
|
||||
kfree(st);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad5624r_id[] = {
|
||||
{"ad5624r", 12},
|
||||
{"ad5644r", 14},
|
||||
{"ad5664r", 16},
|
||||
{"ad5624r3", ID_AD5624R3},
|
||||
{"ad5644r3", ID_AD5644R3},
|
||||
{"ad5664r3", ID_AD5664R3},
|
||||
{"ad5624r5", ID_AD5624R5},
|
||||
{"ad5644r5", ID_AD5644R5},
|
||||
{"ad5664r5", ID_AD5664R5},
|
||||
{}
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue