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https://github.com/nxp-imx/linux-imx.git
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d7348e0308
When system do warm reboot, chip should enter the standby state. It will ensure in every boot the chip is enabled in same chip internal logic state. Add shutdown support for the sensor to disable pm and set the sensor in standby state in system reboot. Now this sensor relies on rpm resume suspend to make it enter active mode and standby mode. When sensor in active mode, system start to shutdown, because autosuspend_delay value is set 2 seconds, sometimes this sensor doesn't enter rpm suspend in time when system finished shutdown. So in next boot the sensor will keep in active mode. In this case, more time need to be spent to finish the chip reset. According to datasheet, this sensor need enough time to complete the reset, otherwise any I2C operation will cause the sensor hang the bus. Signed-off-by: Carlos Song <carlos.song@nxp.com> Reviewed-by: Haibo Chen <haibo.chen@nxp.com> Tested-by: Ye Li <ye.li@nxp.com>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* NXP FXLS8962AF/FXLS8964AF Accelerometer SPI Driver
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*
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* Copyright 2021 Connected Cars A/S
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*/
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#include <linux/dev_printk.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/spi/spi.h>
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#include <linux/regmap.h>
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#include "fxls8962af.h"
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static int fxls8962af_probe(struct spi_device *spi)
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{
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struct regmap *regmap;
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regmap = devm_regmap_init_spi(spi, &fxls8962af_spi_regmap_conf);
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if (IS_ERR(regmap)) {
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dev_err(&spi->dev, "Failed to initialize spi regmap\n");
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return PTR_ERR(regmap);
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}
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return fxls8962af_core_probe(&spi->dev, regmap, spi->irq);
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}
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static const struct of_device_id fxls8962af_spi_of_match[] = {
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{ .compatible = "nxp,fxls8962af" },
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{ .compatible = "nxp,fxls8964af" },
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{}
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};
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MODULE_DEVICE_TABLE(of, fxls8962af_spi_of_match);
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static const struct spi_device_id fxls8962af_spi_id_table[] = {
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{ "fxls8962af", fxls8962af },
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{ "fxls8964af", fxls8964af },
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{}
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};
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MODULE_DEVICE_TABLE(spi, fxls8962af_spi_id_table);
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static void fxls8962af_shutdown(struct spi_device *spi)
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{
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fxls8962af_core_shutdown(&spi->dev);
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};
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static struct spi_driver fxls8962af_driver = {
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.driver = {
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.name = "fxls8962af_spi",
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.pm = pm_ptr(&fxls8962af_pm_ops),
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.of_match_table = fxls8962af_spi_of_match,
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},
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.shutdown = fxls8962af_shutdown,
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.probe = fxls8962af_probe,
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.id_table = fxls8962af_spi_id_table,
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};
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module_spi_driver(fxls8962af_driver);
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MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
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MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer spi driver");
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MODULE_LICENSE("GPL v2");
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MODULE_IMPORT_NS(IIO_FXLS8962AF);
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