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Second round of new drivers and cleanups for IIO in the 3.17 cycle.
New drivers
* mcp4902, mcp4912 and mcp4922 SPI DAC driver.
* max1027, max1029 and max1031 SPI ADC driver.
Cleanups
* cm32181 - use devm APIs to simplify error paths.
* ak8975 - use devm APIs to simplify error paths.
* ad9850 - drop some unused defines and an unnecessary goto.
* hmc5843 - add missing devices to the device id table and the documentation.
* ad9832 - small formatting cleanups.
* sca3000 - hide direct use of the stufftoread element by adding a
data_available function. This is a precursor for the addition of buffer
watermarks to the subsystem but stands as a good cleanup on its own.
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Merge tag 'iio-for-3.17b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes:
Second round of new drivers and cleanups for IIO in the 3.17 cycle.
New drivers
* mcp4902, mcp4912 and mcp4922 SPI DAC driver.
* max1027, max1029 and max1031 SPI ADC driver.
Cleanups
* cm32181 - use devm APIs to simplify error paths.
* ak8975 - use devm APIs to simplify error paths.
* ad9850 - drop some unused defines and an unnecessary goto.
* hmc5843 - add missing devices to the device id table and the documentation.
* ad9832 - small formatting cleanups.
* sca3000 - hide direct use of the stufftoread element by adding a
data_available function. This is a precursor for the addition of buffer
watermarks to the subsystem but stands as a good cleanup on its own.
This commit is contained in:
Greg Kroah-Hartman
commit
3dc50c1af3
22
Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
Normal file
22
Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
Normal file
@ -0,0 +1,22 @@
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* Maxim 1027/1029/1031 Analog to Digital Converter (ADC)
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Required properties:
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- compatible: Should be "maxim,max1027" or "maxim,max1029" or "maxim,max1031"
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- reg: SPI chip select number for the device
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- interrupt-parent: phandle to the parent interrupt controller
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see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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- interrupts: IRQ line for the ADC
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see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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Recommended properties:
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- spi-max-frequency: Definition as per
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Documentation/devicetree/bindings/spi/spi-bus.txt
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Example:
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adc@0 {
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compatible = "maxim,max1027";
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reg = <0>;
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interrupt-parent = <&gpio5>;
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interrupts = <15 IRQ_TYPE_EDGE_RISING>;
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spi-max-frequency = <1000000>;
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};
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@ -3,6 +3,9 @@
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Required properties:
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- compatible : should be "honeywell,hmc5843"
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Other models which are supported with driver are:
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"honeywell,hmc5883"
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"honeywell,hmc5883l"
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- reg : the I2C address of the magnetometer - typically 0x1e
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Optional properties:
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@ -131,6 +131,15 @@ config LP8788_ADC
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help
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Say yes here to build support for TI LP8788 ADC.
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config MAX1027
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tristate "Maxim max1027 ADC driver"
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depends on SPI
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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help
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Say yes here to build support for Maxim SPI ADC models
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max1027, max1029 and max1031.
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config MAX1363
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tristate "Maxim max1363 ADC driver"
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depends on I2C
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@ -15,6 +15,7 @@ obj-$(CONFIG_AD799X) += ad799x.o
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obj-$(CONFIG_AT91_ADC) += at91_adc.o
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obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
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obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
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obj-$(CONFIG_MAX1027) += max1027.o
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obj-$(CONFIG_MAX1363) += max1363.o
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obj-$(CONFIG_MCP320X) += mcp320x.o
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obj-$(CONFIG_MCP3422) += mcp3422.o
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521
drivers/iio/adc/max1027.c
Normal file
521
drivers/iio/adc/max1027.c
Normal file
@ -0,0 +1,521 @@
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/*
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* iio/adc/max1027.c
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* Copyright (C) 2014 Philippe Reynes
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*
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* based on linux/drivers/iio/ad7923.c
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* Copyright 2011 Analog Devices Inc (from AD7923 Driver)
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* Copyright 2012 CS Systemes d'Information
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* max1027.c
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*
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* Partial support for max1027 and similar chips.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.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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#define MAX1027_CONV_REG BIT(7)
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#define MAX1027_SETUP_REG BIT(6)
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#define MAX1027_AVG_REG BIT(5)
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#define MAX1027_RST_REG BIT(4)
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/* conversion register */
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#define MAX1027_TEMP BIT(0)
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#define MAX1027_SCAN_0_N (0x00 << 1)
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#define MAX1027_SCAN_N_M (0x01 << 1)
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#define MAX1027_SCAN_N (0x02 << 1)
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#define MAX1027_NOSCAN (0x03 << 1)
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#define MAX1027_CHAN(n) ((n) << 3)
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/* setup register */
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#define MAX1027_UNIPOLAR 0x02
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#define MAX1027_BIPOLAR 0x03
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#define MAX1027_REF_MODE0 (0x00 << 2)
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#define MAX1027_REF_MODE1 (0x01 << 2)
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#define MAX1027_REF_MODE2 (0x02 << 2)
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#define MAX1027_REF_MODE3 (0x03 << 2)
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#define MAX1027_CKS_MODE0 (0x00 << 4)
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#define MAX1027_CKS_MODE1 (0x01 << 4)
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#define MAX1027_CKS_MODE2 (0x02 << 4)
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#define MAX1027_CKS_MODE3 (0x03 << 4)
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/* averaging register */
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#define MAX1027_NSCAN_4 0x00
|
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#define MAX1027_NSCAN_8 0x01
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#define MAX1027_NSCAN_12 0x02
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#define MAX1027_NSCAN_16 0x03
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#define MAX1027_NAVG_4 (0x00 << 2)
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#define MAX1027_NAVG_8 (0x01 << 2)
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#define MAX1027_NAVG_16 (0x02 << 2)
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#define MAX1027_NAVG_32 (0x03 << 2)
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#define MAX1027_AVG_EN BIT(4)
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enum max1027_id {
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max1027,
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||||
max1029,
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max1031,
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||||
};
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|
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static const struct spi_device_id max1027_id[] = {
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{"max1027", max1027},
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{"max1029", max1029},
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{"max1031", max1031},
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{}
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};
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MODULE_DEVICE_TABLE(spi, max1027_id);
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#ifdef CONFIG_OF
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static const struct of_device_id max1027_adc_dt_ids[] = {
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{ .compatible = "maxim,max1027" },
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{ .compatible = "maxim,max1029" },
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{ .compatible = "maxim,max1031" },
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{},
|
||||
};
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MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
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#endif
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#define MAX1027_V_CHAN(index) \
|
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{ \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = index, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
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.scan_index = index + 1, \
|
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.scan_type = { \
|
||||
.sign = 'u', \
|
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.realbits = 10, \
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.storagebits = 16, \
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.shift = 2, \
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.endianness = IIO_BE, \
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}, \
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||||
}
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|
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#define MAX1027_T_CHAN \
|
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{ \
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.type = IIO_TEMP, \
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.channel = 0, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
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.scan_index = 0, \
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.scan_type = { \
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.sign = 'u', \
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.realbits = 12, \
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.storagebits = 16, \
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.endianness = IIO_BE, \
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}, \
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}
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static const struct iio_chan_spec max1027_channels[] = {
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MAX1027_T_CHAN,
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MAX1027_V_CHAN(0),
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MAX1027_V_CHAN(1),
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MAX1027_V_CHAN(2),
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MAX1027_V_CHAN(3),
|
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MAX1027_V_CHAN(4),
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MAX1027_V_CHAN(5),
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MAX1027_V_CHAN(6),
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MAX1027_V_CHAN(7)
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};
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static const struct iio_chan_spec max1029_channels[] = {
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MAX1027_T_CHAN,
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MAX1027_V_CHAN(0),
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MAX1027_V_CHAN(1),
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MAX1027_V_CHAN(2),
|
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MAX1027_V_CHAN(3),
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MAX1027_V_CHAN(4),
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MAX1027_V_CHAN(5),
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MAX1027_V_CHAN(6),
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MAX1027_V_CHAN(7),
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MAX1027_V_CHAN(8),
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MAX1027_V_CHAN(9),
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MAX1027_V_CHAN(10),
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MAX1027_V_CHAN(11)
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};
|
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|
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static const struct iio_chan_spec max1031_channels[] = {
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MAX1027_T_CHAN,
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MAX1027_V_CHAN(0),
|
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MAX1027_V_CHAN(1),
|
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MAX1027_V_CHAN(2),
|
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MAX1027_V_CHAN(3),
|
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MAX1027_V_CHAN(4),
|
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MAX1027_V_CHAN(5),
|
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MAX1027_V_CHAN(6),
|
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MAX1027_V_CHAN(7),
|
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MAX1027_V_CHAN(8),
|
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MAX1027_V_CHAN(9),
|
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MAX1027_V_CHAN(10),
|
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MAX1027_V_CHAN(11),
|
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MAX1027_V_CHAN(12),
|
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MAX1027_V_CHAN(13),
|
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MAX1027_V_CHAN(14),
|
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MAX1027_V_CHAN(15)
|
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};
|
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|
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static const unsigned long max1027_available_scan_masks[] = {
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0x000001ff,
|
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0x00000000,
|
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};
|
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|
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static const unsigned long max1029_available_scan_masks[] = {
|
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0x00001fff,
|
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0x00000000,
|
||||
};
|
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|
||||
static const unsigned long max1031_available_scan_masks[] = {
|
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0x0001ffff,
|
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0x00000000,
|
||||
};
|
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|
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struct max1027_chip_info {
|
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const struct iio_chan_spec *channels;
|
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unsigned int num_channels;
|
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const unsigned long *available_scan_masks;
|
||||
};
|
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|
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static const struct max1027_chip_info max1027_chip_info_tbl[] = {
|
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[max1027] = {
|
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.channels = max1027_channels,
|
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.num_channels = ARRAY_SIZE(max1027_channels),
|
||||
.available_scan_masks = max1027_available_scan_masks,
|
||||
},
|
||||
[max1029] = {
|
||||
.channels = max1029_channels,
|
||||
.num_channels = ARRAY_SIZE(max1029_channels),
|
||||
.available_scan_masks = max1029_available_scan_masks,
|
||||
},
|
||||
[max1031] = {
|
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.channels = max1031_channels,
|
||||
.num_channels = ARRAY_SIZE(max1031_channels),
|
||||
.available_scan_masks = max1031_available_scan_masks,
|
||||
},
|
||||
};
|
||||
|
||||
struct max1027_state {
|
||||
const struct max1027_chip_info *info;
|
||||
struct spi_device *spi;
|
||||
struct iio_trigger *trig;
|
||||
__be16 *buffer;
|
||||
struct mutex lock;
|
||||
|
||||
u8 reg ____cacheline_aligned;
|
||||
};
|
||||
|
||||
static int max1027_read_single_value(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val)
|
||||
{
|
||||
int ret;
|
||||
struct max1027_state *st = iio_priv(indio_dev);
|
||||
|
||||
if (iio_buffer_enabled(indio_dev)) {
|
||||
dev_warn(&indio_dev->dev, "trigger mode already enabled");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
/* Start acquisition on conversion register write */
|
||||
st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;
|
||||
ret = spi_write(st->spi, &st->reg, 1);
|
||||
if (ret < 0) {
|
||||
dev_err(&indio_dev->dev,
|
||||
"Failed to configure setup register\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Configure conversion register with the requested chan */
|
||||
st->reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel) |
|
||||
MAX1027_NOSCAN | !!(chan->type == IIO_TEMP);
|
||||
ret = spi_write(st->spi, &st->reg, 1);
|
||||
if (ret < 0) {
|
||||
dev_err(&indio_dev->dev,
|
||||
"Failed to configure conversion register\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* For an unknown reason, when we use the mode "10" (write
|
||||
* conversion register), the interrupt doesn't occur every time.
|
||||
* So we just wait 1 ms.
|
||||
*/
|
||||
mdelay(1);
|
||||
|
||||
/* Read result */
|
||||
ret = spi_read(st->spi, st->buffer, (chan->type == IIO_TEMP) ? 4 : 2);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
*val = be16_to_cpu(st->buffer[0]);
|
||||
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
static int max1027_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val, int *val2, long mask)
|
||||
{
|
||||
int ret = 0;
|
||||
struct max1027_state *st = iio_priv(indio_dev);
|
||||
|
||||
mutex_lock(&st->lock);
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
ret = max1027_read_single_value(indio_dev, chan, val);
|
||||
break;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
switch (chan->type) {
|
||||
case IIO_TEMP:
|
||||
*val = 1;
|
||||
*val2 = 8;
|
||||
ret = IIO_VAL_FRACTIONAL;
|
||||
break;
|
||||
case IIO_VOLTAGE:
|
||||
*val = 2500;
|
||||
*val2 = 10;
|
||||
ret = IIO_VAL_FRACTIONAL_LOG2;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
mutex_unlock(&st->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int max1027_debugfs_reg_access(struct iio_dev *indio_dev,
|
||||
unsigned reg, unsigned writeval,
|
||||
unsigned *readval)
|
||||
{
|
||||
struct max1027_state *st = iio_priv(indio_dev);
|
||||
u8 *val = (u8 *)st->buffer;
|
||||
|
||||
if (readval != NULL)
|
||||
return -EINVAL;
|
||||
|
||||
*val = (u8)writeval;
|
||||
return spi_write(st->spi, val, 1);
|
||||
}
|
||||
|
||||
static int max1027_validate_trigger(struct iio_dev *indio_dev,
|
||||
struct iio_trigger *trig)
|
||||
{
|
||||
struct max1027_state *st = iio_priv(indio_dev);
|
||||
|
||||
if (st->trig != trig)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int max1027_set_trigger_state(struct iio_trigger *trig, bool state)
|
||||
{
|
||||
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
|
||||
struct max1027_state *st = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
if (state) {
|
||||
/* Start acquisition on cnvst */
|
||||
st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE0 |
|
||||
MAX1027_REF_MODE2;
|
||||
ret = spi_write(st->spi, &st->reg, 1);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* Scan from 0 to max */
|
||||
st->reg = MAX1027_CONV_REG | MAX1027_CHAN(0) |
|
||||
MAX1027_SCAN_N_M | MAX1027_TEMP;
|
||||
ret = spi_write(st->spi, &st->reg, 1);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
} else {
|
||||
/* Start acquisition on conversion register write */
|
||||
st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE2 |
|
||||
MAX1027_REF_MODE2;
|
||||
ret = spi_write(st->spi, &st->reg, 1);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int max1027_validate_device(struct iio_trigger *trig,
|
||||
struct iio_dev *indio_dev)
|
||||
{
|
||||
struct iio_dev *indio = iio_trigger_get_drvdata(trig);
|
||||
|
||||
if (indio != indio_dev)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static irqreturn_t max1027_trigger_handler(int irq, void *private)
|
||||
{
|
||||
struct iio_poll_func *pf = (struct iio_poll_func *)private;
|
||||
struct iio_dev *indio_dev = pf->indio_dev;
|
||||
struct max1027_state *st = iio_priv(indio_dev);
|
||||
|
||||
pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq, private);
|
||||
|
||||
/* fill buffer with all channel */
|
||||
spi_read(st->spi, st->buffer, indio_dev->masklength * 2);
|
||||
|
||||
iio_push_to_buffers(indio_dev, st->buffer);
|
||||
|
||||
iio_trigger_notify_done(indio_dev->trig);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static const struct iio_trigger_ops max1027_trigger_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.validate_device = &max1027_validate_device,
|
||||
.set_trigger_state = &max1027_set_trigger_state,
|
||||
};
|
||||
|
||||
static const struct iio_info max1027_info = {
|
||||
.driver_module = THIS_MODULE,
|
||||
.read_raw = &max1027_read_raw,
|
||||
.validate_trigger = &max1027_validate_trigger,
|
||||
.debugfs_reg_access = &max1027_debugfs_reg_access,
|
||||
};
|
||||
|
||||
static int max1027_probe(struct spi_device *spi)
|
||||
{
|
||||
int ret;
|
||||
struct iio_dev *indio_dev;
|
||||
struct max1027_state *st;
|
||||
|
||||
pr_debug("%s: probe(spi = 0x%p)\n", __func__, spi);
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
||||
if (indio_dev == NULL) {
|
||||
pr_err("Can't allocate iio device\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
spi_set_drvdata(spi, indio_dev);
|
||||
|
||||
st = iio_priv(indio_dev);
|
||||
st->spi = spi;
|
||||
st->info = &max1027_chip_info_tbl[spi_get_device_id(spi)->driver_data];
|
||||
|
||||
mutex_init(&st->lock);
|
||||
|
||||
indio_dev->name = spi_get_device_id(spi)->name;
|
||||
indio_dev->dev.parent = &spi->dev;
|
||||
indio_dev->info = &max1027_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = st->info->channels;
|
||||
indio_dev->num_channels = st->info->num_channels;
|
||||
indio_dev->available_scan_masks = st->info->available_scan_masks;
|
||||
|
||||
st->buffer = devm_kmalloc(&indio_dev->dev,
|
||||
indio_dev->num_channels * 2,
|
||||
GFP_KERNEL);
|
||||
if (st->buffer == NULL) {
|
||||
dev_err(&indio_dev->dev, "Can't allocate bufffer\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
|
||||
&max1027_trigger_handler, NULL);
|
||||
if (ret < 0) {
|
||||
dev_err(&indio_dev->dev, "Failed to setup buffer\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
|
||||
indio_dev->name);
|
||||
if (st->trig == NULL) {
|
||||
ret = -ENOMEM;
|
||||
dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
|
||||
goto fail_trigger_alloc;
|
||||
}
|
||||
|
||||
st->trig->ops = &max1027_trigger_ops;
|
||||
st->trig->dev.parent = &spi->dev;
|
||||
iio_trigger_set_drvdata(st->trig, indio_dev);
|
||||
iio_trigger_register(st->trig);
|
||||
|
||||
ret = devm_request_threaded_irq(&spi->dev, spi->irq,
|
||||
iio_trigger_generic_data_rdy_poll,
|
||||
NULL,
|
||||
IRQF_TRIGGER_FALLING,
|
||||
spi->dev.driver->name, st->trig);
|
||||
if (ret < 0) {
|
||||
dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
|
||||
goto fail_dev_register;
|
||||
}
|
||||
|
||||
/* Disable averaging */
|
||||
st->reg = MAX1027_AVG_REG;
|
||||
ret = spi_write(st->spi, &st->reg, 1);
|
||||
if (ret < 0) {
|
||||
dev_err(&indio_dev->dev, "Failed to configure averaging register\n");
|
||||
goto fail_dev_register;
|
||||
}
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret < 0) {
|
||||
dev_err(&indio_dev->dev, "Failed to register iio device\n");
|
||||
goto fail_dev_register;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail_dev_register:
|
||||
fail_trigger_alloc:
|
||||
iio_triggered_buffer_cleanup(indio_dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int max1027_remove(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
||||
|
||||
pr_debug("%s: remove(spi = 0x%p)\n", __func__, spi);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
iio_triggered_buffer_cleanup(indio_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct spi_driver max1027_driver = {
|
||||
.driver = {
|
||||
.name = "max1027",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = max1027_probe,
|
||||
.remove = max1027_remove,
|
||||
.id_table = max1027_id,
|
||||
};
|
||||
module_spi_driver(max1027_driver);
|
||||
|
||||
MODULE_AUTHOR("Philippe Reynes <tremyfr@yahoo.fr>");
|
||||
MODULE_DESCRIPTION("MAX1027/MAX1029/MAX1031 ADC");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
@ -163,4 +163,14 @@ config MCP4725
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called mcp4725.
|
||||
|
||||
config MCP4922
|
||||
tristate "MCP4902, MCP4912, MCP4922 DAC driver"
|
||||
depends on SPI
|
||||
help
|
||||
Say yes here to build the driver for the Microchip MCP4902
|
||||
MCP4912, and MCP4922 DAC devices.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called mcp4922.
|
||||
|
||||
endmenu
|
||||
|
||||
@ -18,3 +18,4 @@ obj-$(CONFIG_AD5686) += ad5686.o
|
||||
obj-$(CONFIG_AD7303) += ad7303.o
|
||||
obj-$(CONFIG_MAX517) += max517.o
|
||||
obj-$(CONFIG_MCP4725) += mcp4725.o
|
||||
obj-$(CONFIG_MCP4922) += mcp4922.o
|
||||
|
||||
216
drivers/iio/dac/mcp4922.c
Normal file
216
drivers/iio/dac/mcp4922.c
Normal file
@ -0,0 +1,216 @@
|
||||
/*
|
||||
* mcp4922.c
|
||||
*
|
||||
* Driver for Microchip Digital to Analog Converters.
|
||||
* Supports MCP4902, MCP4912, and MCP4922.
|
||||
*
|
||||
* Copyright (c) 2014 EMAC Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
#include <linux/regulator/consumer.h>
|
||||
#include <linux/bitops.h>
|
||||
|
||||
#define MCP4922_NUM_CHANNELS 2
|
||||
|
||||
enum mcp4922_supported_device_ids {
|
||||
ID_MCP4902,
|
||||
ID_MCP4912,
|
||||
ID_MCP4922,
|
||||
};
|
||||
|
||||
struct mcp4922_state {
|
||||
struct spi_device *spi;
|
||||
unsigned int value[MCP4922_NUM_CHANNELS];
|
||||
unsigned int vref_mv;
|
||||
struct regulator *vref_reg;
|
||||
u8 mosi[2] ____cacheline_aligned;
|
||||
};
|
||||
|
||||
#define MCP4922_CHAN(chan, bits) { \
|
||||
.type = IIO_VOLTAGE, \
|
||||
.output = 1, \
|
||||
.indexed = 1, \
|
||||
.channel = chan, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
||||
.scan_type = { \
|
||||
.sign = 'u', \
|
||||
.realbits = (bits), \
|
||||
.storagebits = 16, \
|
||||
.shift = 12 - (bits), \
|
||||
}, \
|
||||
}
|
||||
|
||||
static int mcp4922_spi_write(struct mcp4922_state *state, u8 addr, u32 val)
|
||||
{
|
||||
state->mosi[1] = val & 0xff;
|
||||
state->mosi[0] = (addr == 0) ? 0x00 : 0x80;
|
||||
state->mosi[0] |= 0x30 | ((val >> 8) & 0x0f);
|
||||
|
||||
return spi_write(state->spi, state->mosi, 2);
|
||||
}
|
||||
|
||||
static int mcp4922_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val,
|
||||
int *val2,
|
||||
long mask)
|
||||
{
|
||||
struct mcp4922_state *state = iio_priv(indio_dev);
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
*val = state->value[chan->channel];
|
||||
return IIO_VAL_INT;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
*val = state->vref_mv;
|
||||
*val2 = chan->scan_type.realbits;
|
||||
return IIO_VAL_FRACTIONAL_LOG2;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int mcp4922_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int val,
|
||||
int val2,
|
||||
long mask)
|
||||
{
|
||||
struct mcp4922_state *state = iio_priv(indio_dev);
|
||||
|
||||
if (val2 != 0)
|
||||
return -EINVAL;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
if (val > GENMASK(chan->scan_type.realbits-1, 0))
|
||||
return -EINVAL;
|
||||
val <<= chan->scan_type.shift;
|
||||
state->value[chan->channel] = val;
|
||||
return mcp4922_spi_write(state, chan->channel, val);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec mcp4922_channels[3][MCP4922_NUM_CHANNELS] = {
|
||||
[ID_MCP4902] = { MCP4922_CHAN(0, 8), MCP4922_CHAN(1, 8) },
|
||||
[ID_MCP4912] = { MCP4922_CHAN(0, 10), MCP4922_CHAN(1, 10) },
|
||||
[ID_MCP4922] = { MCP4922_CHAN(0, 12), MCP4922_CHAN(1, 12) },
|
||||
};
|
||||
|
||||
static const struct iio_info mcp4922_info = {
|
||||
.read_raw = &mcp4922_read_raw,
|
||||
.write_raw = &mcp4922_write_raw,
|
||||
.driver_module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int mcp4922_probe(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct mcp4922_state *state;
|
||||
const struct spi_device_id *id;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*state));
|
||||
if (indio_dev == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
state = iio_priv(indio_dev);
|
||||
state->spi = spi;
|
||||
state->vref_reg = devm_regulator_get(&spi->dev, "vref");
|
||||
if (IS_ERR(state->vref_reg)) {
|
||||
dev_err(&spi->dev, "Vref regulator not specified\n");
|
||||
return PTR_ERR(state->vref_reg);
|
||||
}
|
||||
|
||||
ret = regulator_enable(state->vref_reg);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to enable vref regulator: %d\n",
|
||||
ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = regulator_get_voltage(state->vref_reg);
|
||||
if (ret < 0) {
|
||||
dev_err(&spi->dev, "Failed to read vref regulator: %d\n",
|
||||
ret);
|
||||
goto error_disable_reg;
|
||||
}
|
||||
state->vref_mv = ret / 1000;
|
||||
|
||||
spi_set_drvdata(spi, indio_dev);
|
||||
id = spi_get_device_id(spi);
|
||||
indio_dev->dev.parent = &spi->dev;
|
||||
indio_dev->info = &mcp4922_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = mcp4922_channels[id->driver_data];
|
||||
indio_dev->num_channels = MCP4922_NUM_CHANNELS;
|
||||
indio_dev->name = id->name;
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to register iio device: %d\n",
|
||||
ret);
|
||||
goto error_disable_reg;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
error_disable_reg:
|
||||
regulator_disable(state->vref_reg);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int mcp4922_remove(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
||||
struct mcp4922_state *state;
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
state = iio_priv(indio_dev);
|
||||
regulator_disable(state->vref_reg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id mcp4922_id[] = {
|
||||
{"mcp4902", ID_MCP4902},
|
||||
{"mcp4912", ID_MCP4912},
|
||||
{"mcp4922", ID_MCP4922},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, mcp4922_id);
|
||||
|
||||
static struct spi_driver mcp4922_driver = {
|
||||
.driver = {
|
||||
.name = "mcp4922",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = mcp4922_probe,
|
||||
.remove = mcp4922_remove,
|
||||
.id_table = mcp4922_id,
|
||||
};
|
||||
module_spi_driver(mcp4922_driver);
|
||||
|
||||
MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
|
||||
MODULE_DESCRIPTION("Microchip MCP4902, MCP4912, MCP4922 DAC");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
@ -39,10 +39,7 @@ static bool iio_buffer_is_active(struct iio_buffer *buf)
|
||||
|
||||
static bool iio_buffer_data_available(struct iio_buffer *buf)
|
||||
{
|
||||
if (buf->access->data_available)
|
||||
return buf->access->data_available(buf);
|
||||
|
||||
return buf->stufftoread;
|
||||
return buf->access->data_available(buf);
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@ -331,7 +331,7 @@ static int cm32181_probe(struct i2c_client *client,
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
ret = devm_iio_device_register(&client->dev, indio_dev);
|
||||
if (ret) {
|
||||
dev_err(&client->dev,
|
||||
"%s: regist device failed\n",
|
||||
@ -342,14 +342,6 @@ static int cm32181_probe(struct i2c_client *client,
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cm32181_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id cm32181_id[] = {
|
||||
{ "cm32181", 0 },
|
||||
{ }
|
||||
@ -370,7 +362,6 @@ static struct i2c_driver cm32181_driver = {
|
||||
},
|
||||
.id_table = cm32181_id,
|
||||
.probe = cm32181_probe,
|
||||
.remove = cm32181_remove,
|
||||
};
|
||||
|
||||
module_i2c_driver(cm32181_driver);
|
||||
|
||||
@ -165,7 +165,7 @@ static int ak8975_setup_irq(struct ak8975_data *data)
|
||||
else
|
||||
irq = gpio_to_irq(data->eoc_gpio);
|
||||
|
||||
rc = request_irq(irq, ak8975_irq_handler,
|
||||
rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler,
|
||||
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
||||
dev_name(&client->dev), data);
|
||||
if (rc < 0) {
|
||||
@ -513,21 +513,21 @@ static int ak8975_probe(struct i2c_client *client,
|
||||
/* We may not have a GPIO based IRQ to scan, that is fine, we will
|
||||
poll if so */
|
||||
if (gpio_is_valid(eoc_gpio)) {
|
||||
err = gpio_request_one(eoc_gpio, GPIOF_IN, "ak_8975");
|
||||
err = devm_gpio_request_one(&client->dev, eoc_gpio,
|
||||
GPIOF_IN, "ak_8975");
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev,
|
||||
"failed to request GPIO %d, error %d\n",
|
||||
eoc_gpio, err);
|
||||
goto exit;
|
||||
return err;
|
||||
}
|
||||
}
|
||||
|
||||
/* Register with IIO */
|
||||
indio_dev = iio_device_alloc(sizeof(*data));
|
||||
if (indio_dev == NULL) {
|
||||
err = -ENOMEM;
|
||||
goto exit_gpio;
|
||||
}
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
||||
if (indio_dev == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
data = iio_priv(indio_dev);
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
|
||||
@ -542,17 +542,16 @@ static int ak8975_probe(struct i2c_client *client,
|
||||
name = (char *) id->name;
|
||||
} else if (ACPI_HANDLE(&client->dev))
|
||||
name = ak8975_match_acpi_device(&client->dev, &data->chipset);
|
||||
else {
|
||||
err = -ENOSYS;
|
||||
goto exit_free_iio;
|
||||
}
|
||||
else
|
||||
return -ENOSYS;
|
||||
|
||||
dev_dbg(&client->dev, "Asahi compass chip %s\n", name);
|
||||
|
||||
/* Perform some basic start-of-day setup of the device. */
|
||||
err = ak8975_setup(client);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "AK8975 initialization fails\n");
|
||||
goto exit_free_iio;
|
||||
return err;
|
||||
}
|
||||
|
||||
data->client = client;
|
||||
@ -564,37 +563,9 @@ static int ak8975_probe(struct i2c_client *client,
|
||||
indio_dev->info = &ak8975_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->name = name;
|
||||
err = iio_device_register(indio_dev);
|
||||
err = devm_iio_device_register(&client->dev, indio_dev);
|
||||
if (err < 0)
|
||||
goto exit_free_iio;
|
||||
|
||||
return 0;
|
||||
|
||||
exit_free_iio:
|
||||
iio_device_free(indio_dev);
|
||||
if (data->eoc_irq)
|
||||
free_irq(data->eoc_irq, data);
|
||||
exit_gpio:
|
||||
if (gpio_is_valid(eoc_gpio))
|
||||
gpio_free(eoc_gpio);
|
||||
exit:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ak8975_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
struct ak8975_data *data = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
|
||||
if (data->eoc_irq)
|
||||
free_irq(data->eoc_irq, data);
|
||||
|
||||
if (gpio_is_valid(data->eoc_gpio))
|
||||
gpio_free(data->eoc_gpio);
|
||||
|
||||
iio_device_free(indio_dev);
|
||||
return err;
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -621,7 +592,6 @@ static struct i2c_driver ak8975_driver = {
|
||||
.acpi_match_table = ACPI_PTR(ak_acpi_match),
|
||||
},
|
||||
.probe = ak8975_probe,
|
||||
.remove = ak8975_remove,
|
||||
.id_table = ak8975_id,
|
||||
};
|
||||
module_i2c_driver(ak8975_driver);
|
||||
|
||||
@ -141,6 +141,11 @@ static int sca3000_ring_get_bytes_per_datum(struct iio_buffer *r)
|
||||
return 6;
|
||||
}
|
||||
|
||||
static bool sca3000_ring_buf_data_available(struct iio_buffer *r)
|
||||
{
|
||||
return r->stufftoread;
|
||||
}
|
||||
|
||||
static IIO_BUFFER_ENABLE_ATTR;
|
||||
static IIO_BUFFER_LENGTH_ATTR;
|
||||
|
||||
@ -274,6 +279,7 @@ static const struct iio_buffer_access_funcs sca3000_ring_access_funcs = {
|
||||
.read_first_n = &sca3000_read_first_n_hw_rb,
|
||||
.get_length = &sca3000_ring_get_length,
|
||||
.get_bytes_per_datum = &sca3000_ring_get_bytes_per_datum,
|
||||
.data_available = sca3000_ring_buf_data_available,
|
||||
.release = sca3000_ring_release,
|
||||
};
|
||||
|
||||
|
||||
@ -57,7 +57,7 @@ static int ad9832_write_frequency(struct ad9832_state *st,
|
||||
}
|
||||
|
||||
static int ad9832_write_phase(struct ad9832_state *st,
|
||||
unsigned long addr, unsigned long phase)
|
||||
unsigned long addr, unsigned long phase)
|
||||
{
|
||||
if (phase > (1 << AD9832_PHASE_BITS))
|
||||
return -EINVAL;
|
||||
@ -72,10 +72,8 @@ static int ad9832_write_phase(struct ad9832_state *st,
|
||||
return spi_sync(st->spi, &st->phase_msg);
|
||||
}
|
||||
|
||||
static ssize_t ad9832_write(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf,
|
||||
size_t len)
|
||||
static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr,
|
||||
const char *buf, size_t len)
|
||||
{
|
||||
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
||||
struct ad9832_state *st = iio_priv(indio_dev);
|
||||
@ -109,11 +107,11 @@ static ssize_t ad9832_write(struct device *dev,
|
||||
ret = spi_sync(st->spi, &st->msg);
|
||||
break;
|
||||
case AD9832_FREQ_SYM:
|
||||
if (val == 1)
|
||||
if (val == 1) {
|
||||
st->ctrl_fp |= AD9832_FREQ;
|
||||
else if (val == 0)
|
||||
} else if (val == 0) {
|
||||
st->ctrl_fp &= ~AD9832_FREQ;
|
||||
else {
|
||||
} else {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -21,9 +21,6 @@
|
||||
|
||||
#define DRV_NAME "ad9850"
|
||||
|
||||
#define value_mask (u16)0xf000
|
||||
#define addr_shift 12
|
||||
|
||||
/* Register format: 4 bits addr + 12 bits value */
|
||||
struct ad9850_config {
|
||||
u8 control[5];
|
||||
@ -50,9 +47,6 @@ static ssize_t ad9850_set_parameter(struct device *dev,
|
||||
mutex_lock(&st->lock);
|
||||
|
||||
ret = spi_sync_transfer(st->sdev, &xfer, 1);
|
||||
if (ret)
|
||||
goto error_ret;
|
||||
error_ret:
|
||||
mutex_unlock(&st->lock);
|
||||
|
||||
return ret ? ret : len;
|
||||
|
||||
@ -630,7 +630,9 @@ static const struct i2c_device_id hmc5843_id[] = {
|
||||
MODULE_DEVICE_TABLE(i2c, hmc5843_id);
|
||||
|
||||
static const struct of_device_id hmc5843_of_match[] = {
|
||||
{ .compatible = "honeywell,hmc5843" },
|
||||
{ .compatible = "honeywell,hmc5843", .data = (void *)HMC5843_ID },
|
||||
{ .compatible = "honeywell,hmc5883", .data = (void *)HMC5883_ID },
|
||||
{ .compatible = "honeywell,hmc5883l", .data = (void *)HMC5883L_ID },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, hmc5843_of_match);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user