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These result in a very small reduction in driver size, but at the cost of more complex build and slightly harder to read code. In the case of of_match_ptr it also prevents use of PRP0001 ACPI based identification. In this particular case we have a valid ACPI/PNP ID that I am assuming was issued by Analog Devices. That should be used in preference to PRP0001 but doesn't mean we should prevent that route. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Michael Hennerich <michael.hennerich@analog.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20200910173242.621168-12-jic23@kernel.org
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* 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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#include "ad5592r-base.h"
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#define AD5593R_MODE_CONF (0 << 4)
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#define AD5593R_MODE_DAC_WRITE (1 << 4)
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#define AD5593R_MODE_ADC_READBACK (4 << 4)
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#define AD5593R_MODE_DAC_READBACK (5 << 4)
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#define AD5593R_MODE_GPIO_READBACK (6 << 4)
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#define AD5593R_MODE_REG_READBACK (7 << 4)
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static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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return i2c_smbus_write_word_swapped(i2c,
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AD5593R_MODE_DAC_WRITE | chan, value);
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}
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static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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s32 val;
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val = i2c_smbus_write_word_swapped(i2c,
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AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
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if (val < 0)
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return (int) val;
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val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK);
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if (val < 0)
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return (int) val;
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*value = (u16) val;
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return 0;
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}
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static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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return i2c_smbus_write_word_swapped(i2c,
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AD5593R_MODE_CONF | reg, value);
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}
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static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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s32 val;
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val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg);
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if (val < 0)
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return (int) val;
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*value = (u16) val;
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return 0;
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}
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static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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s32 val;
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val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK);
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if (val < 0)
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return (int) val;
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*value = (u8) val;
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return 0;
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}
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static const struct ad5592r_rw_ops ad5593r_rw_ops = {
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.write_dac = ad5593r_write_dac,
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.read_adc = ad5593r_read_adc,
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.reg_write = ad5593r_reg_write,
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.reg_read = ad5593r_reg_read,
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.gpio_read = ad5593r_gpio_read,
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};
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static int ad5593r_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
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}
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static int ad5593r_i2c_remove(struct i2c_client *i2c)
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{
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return ad5592r_remove(&i2c->dev);
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}
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static const struct i2c_device_id ad5593r_i2c_ids[] = {
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{ .name = "ad5593r", },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
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static const struct of_device_id ad5593r_of_match[] = {
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{ .compatible = "adi,ad5593r", },
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{},
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};
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MODULE_DEVICE_TABLE(of, ad5593r_of_match);
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static const struct acpi_device_id ad5593r_acpi_match[] = {
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{"ADS5593", },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
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static struct i2c_driver ad5593r_driver = {
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.driver = {
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.name = "ad5593r",
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.of_match_table = ad5593r_of_match,
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.acpi_match_table = ad5593r_acpi_match,
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},
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.probe = ad5593r_i2c_probe,
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.remove = ad5593r_i2c_remove,
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.id_table = ad5593r_i2c_ids,
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};
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module_i2c_driver(ad5593r_driver);
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MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters");
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MODULE_LICENSE("GPL v2");
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