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![Randy Dunlap](/assets/img/avatar_default.png)
At over 4000 #includes, <linux/platform_device.h> is the 9th most #included header file in the Linux kernel. It does not need <linux/mod_devicetable.h>, so drop that header and explicitly add <linux/mod_devicetable.h> to source files that need it. 4146 #include <linux/platform_device.h> After this patch, there are 225 files that use <linux/mod_devicetable.h>, for a reduction of around 3900 times that <linux/mod_devicetable.h> does not have to be read & parsed. 225 #include <linux/mod_devicetable.h> This patch was build-tested on 20 different arch-es. It also makes these drivers SubmitChecklist#1 compliant. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: kbuild test robot <lkp@intel.com> # drivers/media/platform/vimc/ Reported-by: kbuild test robot <lkp@intel.com> # drivers/pinctrl/pinctrl-u300.c Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
173 lines
4.2 KiB
C
173 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015-2017 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include "siox.h"
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#define DRIVER_NAME "siox-gpio"
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struct siox_gpio_ddata {
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struct gpio_desc *din;
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struct gpio_desc *dout;
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struct gpio_desc *dclk;
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struct gpio_desc *dld;
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};
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static unsigned int siox_clkhigh_ns = 1000;
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static unsigned int siox_loadhigh_ns;
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static unsigned int siox_bytegap_ns;
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static int siox_gpio_pushpull(struct siox_master *smaster,
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size_t setbuf_len, const u8 setbuf[],
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size_t getbuf_len, u8 getbuf[])
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{
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struct siox_gpio_ddata *ddata = siox_master_get_devdata(smaster);
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size_t i;
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size_t cycles = max(setbuf_len, getbuf_len);
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/* reset data and clock */
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gpiod_set_value_cansleep(ddata->dout, 0);
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gpiod_set_value_cansleep(ddata->dclk, 0);
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gpiod_set_value_cansleep(ddata->dld, 1);
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ndelay(siox_loadhigh_ns);
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gpiod_set_value_cansleep(ddata->dld, 0);
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for (i = 0; i < cycles; ++i) {
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u8 set = 0, get = 0;
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size_t j;
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if (i >= cycles - setbuf_len)
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set = setbuf[i - (cycles - setbuf_len)];
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for (j = 0; j < 8; ++j) {
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get <<= 1;
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if (gpiod_get_value_cansleep(ddata->din))
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get |= 1;
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/* DOUT is logically inverted */
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gpiod_set_value_cansleep(ddata->dout, !(set & 0x80));
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set <<= 1;
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gpiod_set_value_cansleep(ddata->dclk, 1);
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ndelay(siox_clkhigh_ns);
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gpiod_set_value_cansleep(ddata->dclk, 0);
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}
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if (i < getbuf_len)
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getbuf[i] = get;
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ndelay(siox_bytegap_ns);
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}
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gpiod_set_value_cansleep(ddata->dld, 1);
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ndelay(siox_loadhigh_ns);
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gpiod_set_value_cansleep(ddata->dld, 0);
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/*
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* Resetting dout isn't necessary protocol wise, but it makes the
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* signals more pretty because the dout level is deterministic between
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* cycles. Note that this only affects dout between the master and the
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* first siox device. dout for the later devices depend on the output of
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* the previous siox device.
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*/
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gpiod_set_value_cansleep(ddata->dout, 0);
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return 0;
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}
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static int siox_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct siox_gpio_ddata *ddata;
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int ret;
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struct siox_master *smaster;
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smaster = siox_master_alloc(&pdev->dev, sizeof(*ddata));
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if (!smaster) {
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dev_err(dev, "failed to allocate siox master\n");
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, smaster);
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ddata = siox_master_get_devdata(smaster);
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ddata->din = devm_gpiod_get(dev, "din", GPIOD_IN);
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if (IS_ERR(ddata->din)) {
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ret = PTR_ERR(ddata->din);
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dev_err(dev, "Failed to get %s GPIO: %d\n", "din", ret);
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goto err;
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}
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ddata->dout = devm_gpiod_get(dev, "dout", GPIOD_OUT_LOW);
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if (IS_ERR(ddata->dout)) {
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ret = PTR_ERR(ddata->dout);
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dev_err(dev, "Failed to get %s GPIO: %d\n", "dout", ret);
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goto err;
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}
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ddata->dclk = devm_gpiod_get(dev, "dclk", GPIOD_OUT_LOW);
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if (IS_ERR(ddata->dclk)) {
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ret = PTR_ERR(ddata->dclk);
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dev_err(dev, "Failed to get %s GPIO: %d\n", "dclk", ret);
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goto err;
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}
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ddata->dld = devm_gpiod_get(dev, "dld", GPIOD_OUT_LOW);
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if (IS_ERR(ddata->dld)) {
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ret = PTR_ERR(ddata->dld);
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dev_err(dev, "Failed to get %s GPIO: %d\n", "dld", ret);
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goto err;
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}
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smaster->pushpull = siox_gpio_pushpull;
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/* XXX: determine automatically like spi does */
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smaster->busno = 0;
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ret = siox_master_register(smaster);
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if (ret) {
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dev_err(dev, "Failed to register siox master: %d\n", ret);
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err:
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siox_master_put(smaster);
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}
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return ret;
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}
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static int siox_gpio_remove(struct platform_device *pdev)
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{
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struct siox_master *master = platform_get_drvdata(pdev);
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siox_master_unregister(master);
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return 0;
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}
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static const struct of_device_id siox_gpio_dt_ids[] = {
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{ .compatible = "eckelmann,siox-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, siox_gpio_dt_ids);
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static struct platform_driver siox_gpio_driver = {
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.probe = siox_gpio_probe,
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.remove = siox_gpio_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = siox_gpio_dt_ids,
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},
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};
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module_platform_driver(siox_gpio_driver);
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MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" DRIVER_NAME);
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