72ba450562
Up to now ad5592r_remove() returns zero unconditionally. Make it return void instead which makes it easier to see in the callers that there is no error to handle. Also the return value of i2c and spi remove callbacks is ignored anyway. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com> Link: https://lore.kernel.org/r/20211013203223.2694577-10-u.kleine-koenig@pengutronix.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* AD5592R / AD5593R Digital <-> Analog converters driver
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*
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* Copyright 2015-2016 Analog Devices Inc.
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* Author: Paul Cercueil <paul.cercueil@analog.com>
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*/
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#ifndef __DRIVERS_IIO_DAC_AD5592R_BASE_H__
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#define __DRIVERS_IIO_DAC_AD5592R_BASE_H__
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/mutex.h>
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#include <linux/gpio/driver.h>
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struct device;
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struct ad5592r_state;
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enum ad5592r_registers {
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AD5592R_REG_NOOP = 0x0,
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AD5592R_REG_DAC_READBACK = 0x1,
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AD5592R_REG_ADC_SEQ = 0x2,
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AD5592R_REG_CTRL = 0x3,
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AD5592R_REG_ADC_EN = 0x4,
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AD5592R_REG_DAC_EN = 0x5,
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AD5592R_REG_PULLDOWN = 0x6,
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AD5592R_REG_LDAC = 0x7,
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AD5592R_REG_GPIO_OUT_EN = 0x8,
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AD5592R_REG_GPIO_SET = 0x9,
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AD5592R_REG_GPIO_IN_EN = 0xA,
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AD5592R_REG_PD = 0xB,
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AD5592R_REG_OPEN_DRAIN = 0xC,
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AD5592R_REG_TRISTATE = 0xD,
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AD5592R_REG_RESET = 0xF,
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};
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#define AD5592R_REG_PD_EN_REF BIT(9)
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#define AD5592R_REG_CTRL_ADC_RANGE BIT(5)
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#define AD5592R_REG_CTRL_DAC_RANGE BIT(4)
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struct ad5592r_rw_ops {
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int (*write_dac)(struct ad5592r_state *st, unsigned chan, u16 value);
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int (*read_adc)(struct ad5592r_state *st, unsigned chan, u16 *value);
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int (*reg_write)(struct ad5592r_state *st, u8 reg, u16 value);
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int (*reg_read)(struct ad5592r_state *st, u8 reg, u16 *value);
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int (*gpio_read)(struct ad5592r_state *st, u8 *value);
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};
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struct ad5592r_state {
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struct device *dev;
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struct regulator *reg;
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struct gpio_chip gpiochip;
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struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */
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struct mutex lock;
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unsigned int num_channels;
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const struct ad5592r_rw_ops *ops;
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int scale_avail[2][2];
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u16 cached_dac[8];
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u16 cached_gp_ctrl;
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u8 channel_modes[8];
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u8 channel_offstate[8];
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u8 gpio_map;
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u8 gpio_out;
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u8 gpio_in;
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u8 gpio_val;
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__be16 spi_msg ____cacheline_aligned;
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__be16 spi_msg_nop;
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};
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int ad5592r_probe(struct device *dev, const char *name,
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const struct ad5592r_rw_ops *ops);
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void ad5592r_remove(struct device *dev);
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#endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */
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