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40be06463e
The I2C and SPI PM callbacks were identical (though wrapped in some bouncing out to the bus specific container of the struct device and then back again to get the drvdata). As such rather than just moving these to SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() take the opportunity to unify the struct dev_pm_ops and use the new EXPORT_SIMPLE_DEV_PM_OPS() macro so that we can drop the unused suspend and resume callbacks as well as the structure if !CONFIG_PM_SLEEP without needing to mark the callbacks __maybe_unused. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Michael Hennerich <michael.hennerich@analog.com> Link: https://lore.kernel.org/r/20230114171620.42891-9-jic23@kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface)
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
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*/
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#include <linux/input.h> /* BUS_SPI */
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/pm.h>
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#include <linux/types.h>
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#include "adxl34x.h"
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#define MAX_SPI_FREQ_HZ 5000000
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#define MAX_FREQ_NO_FIFODELAY 1500000
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#define ADXL34X_CMD_MULTB (1 << 6)
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#define ADXL34X_CMD_READ (1 << 7)
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#define ADXL34X_WRITECMD(reg) (reg & 0x3F)
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#define ADXL34X_READCMD(reg) (ADXL34X_CMD_READ | (reg & 0x3F))
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#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ | ADXL34X_CMD_MULTB \
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| (reg & 0x3F))
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static int adxl34x_spi_read(struct device *dev, unsigned char reg)
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{
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struct spi_device *spi = to_spi_device(dev);
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unsigned char cmd;
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cmd = ADXL34X_READCMD(reg);
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return spi_w8r8(spi, cmd);
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}
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static int adxl34x_spi_write(struct device *dev,
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unsigned char reg, unsigned char val)
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{
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struct spi_device *spi = to_spi_device(dev);
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unsigned char buf[2];
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buf[0] = ADXL34X_WRITECMD(reg);
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buf[1] = val;
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return spi_write(spi, buf, sizeof(buf));
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}
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static int adxl34x_spi_read_block(struct device *dev,
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unsigned char reg, int count,
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void *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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ssize_t status;
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reg = ADXL34X_READMB_CMD(reg);
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status = spi_write_then_read(spi, ®, 1, buf, count);
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return (status < 0) ? status : 0;
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}
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static const struct adxl34x_bus_ops adxl34x_spi_bops = {
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.bustype = BUS_SPI,
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.write = adxl34x_spi_write,
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.read = adxl34x_spi_read,
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.read_block = adxl34x_spi_read_block,
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};
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static int adxl34x_spi_probe(struct spi_device *spi)
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{
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struct adxl34x *ac;
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/* don't exceed max specified SPI CLK frequency */
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if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
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dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz);
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return -EINVAL;
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}
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ac = adxl34x_probe(&spi->dev, spi->irq,
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spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY,
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&adxl34x_spi_bops);
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if (IS_ERR(ac))
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return PTR_ERR(ac);
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spi_set_drvdata(spi, ac);
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return 0;
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}
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static void adxl34x_spi_remove(struct spi_device *spi)
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{
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struct adxl34x *ac = spi_get_drvdata(spi);
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adxl34x_remove(ac);
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}
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static struct spi_driver adxl34x_driver = {
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.driver = {
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.name = "adxl34x",
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.pm = pm_sleep_ptr(&adxl34x_pm),
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},
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.probe = adxl34x_spi_probe,
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.remove = adxl34x_spi_remove,
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};
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module_spi_driver(adxl34x_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver");
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MODULE_LICENSE("GPL");
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