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a0386bba70
The value returned by an spi driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com> Acked-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: Claudius Heine <ch@denx.de> Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC Acked-by: Marcus Folkesson <marcus.folkesson@gmail.com> Acked-by: Łukasz Stelmach <l.stelmach@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20220123175201.34839-6-u.kleine-koenig@pengutronix.de Signed-off-by: Mark Brown <broonie@kernel.org>
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2006 Juergen Beisert, Pengutronix
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* Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix
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* Copyright (C) 2009 Wolfram Sang, Pengutronix
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*
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* Check max730x.c for further details.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/max7301.h>
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/* A write to the MAX7301 means one message with one transfer */
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static int max7301_spi_write(struct device *dev, unsigned int reg,
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unsigned int val)
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{
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struct spi_device *spi = to_spi_device(dev);
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u16 word = ((reg & 0x7F) << 8) | (val & 0xFF);
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return spi_write_then_read(spi, &word, sizeof(word), NULL, 0);
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}
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/* A read from the MAX7301 means two transfers; here, one message each */
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static int max7301_spi_read(struct device *dev, unsigned int reg)
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{
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int ret;
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u16 word;
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struct spi_device *spi = to_spi_device(dev);
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word = 0x8000 | (reg << 8);
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ret = spi_write_then_read(spi, &word, sizeof(word), &word,
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sizeof(word));
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if (ret)
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return ret;
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return word & 0xff;
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}
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static int max7301_probe(struct spi_device *spi)
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{
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struct max7301 *ts;
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int ret;
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/* bits_per_word cannot be configured in platform data */
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spi->bits_per_word = 16;
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ret = spi_setup(spi);
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if (ret < 0)
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return ret;
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ts = devm_kzalloc(&spi->dev, sizeof(struct max7301), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->read = max7301_spi_read;
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ts->write = max7301_spi_write;
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ts->dev = &spi->dev;
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ret = __max730x_probe(ts);
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return ret;
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}
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static void max7301_remove(struct spi_device *spi)
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{
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__max730x_remove(&spi->dev);
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}
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static const struct spi_device_id max7301_id[] = {
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{ "max7301", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, max7301_id);
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static struct spi_driver max7301_driver = {
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.driver = {
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.name = "max7301",
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},
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.probe = max7301_probe,
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.remove = max7301_remove,
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.id_table = max7301_id,
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};
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static int __init max7301_init(void)
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{
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return spi_register_driver(&max7301_driver);
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}
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/* register after spi postcore initcall and before
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* subsys initcalls that may rely on these GPIOs
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*/
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subsys_initcall(max7301_init);
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static void __exit max7301_exit(void)
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{
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spi_unregister_driver(&max7301_driver);
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}
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module_exit(max7301_exit);
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MODULE_AUTHOR("Juergen Beisert, Wolfram Sang");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("MAX7301 GPIO-Expander");
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