mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
ac3167257b
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>
174 lines
4.2 KiB
C
174 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2015-2017 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
|
|
*/
|
|
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include "siox.h"
|
|
|
|
#define DRIVER_NAME "siox-gpio"
|
|
|
|
struct siox_gpio_ddata {
|
|
struct gpio_desc *din;
|
|
struct gpio_desc *dout;
|
|
struct gpio_desc *dclk;
|
|
struct gpio_desc *dld;
|
|
};
|
|
|
|
static unsigned int siox_clkhigh_ns = 1000;
|
|
static unsigned int siox_loadhigh_ns;
|
|
static unsigned int siox_bytegap_ns;
|
|
|
|
static int siox_gpio_pushpull(struct siox_master *smaster,
|
|
size_t setbuf_len, const u8 setbuf[],
|
|
size_t getbuf_len, u8 getbuf[])
|
|
{
|
|
struct siox_gpio_ddata *ddata = siox_master_get_devdata(smaster);
|
|
size_t i;
|
|
size_t cycles = max(setbuf_len, getbuf_len);
|
|
|
|
/* reset data and clock */
|
|
gpiod_set_value_cansleep(ddata->dout, 0);
|
|
gpiod_set_value_cansleep(ddata->dclk, 0);
|
|
|
|
gpiod_set_value_cansleep(ddata->dld, 1);
|
|
ndelay(siox_loadhigh_ns);
|
|
gpiod_set_value_cansleep(ddata->dld, 0);
|
|
|
|
for (i = 0; i < cycles; ++i) {
|
|
u8 set = 0, get = 0;
|
|
size_t j;
|
|
|
|
if (i >= cycles - setbuf_len)
|
|
set = setbuf[i - (cycles - setbuf_len)];
|
|
|
|
for (j = 0; j < 8; ++j) {
|
|
get <<= 1;
|
|
if (gpiod_get_value_cansleep(ddata->din))
|
|
get |= 1;
|
|
|
|
/* DOUT is logically inverted */
|
|
gpiod_set_value_cansleep(ddata->dout, !(set & 0x80));
|
|
set <<= 1;
|
|
|
|
gpiod_set_value_cansleep(ddata->dclk, 1);
|
|
ndelay(siox_clkhigh_ns);
|
|
gpiod_set_value_cansleep(ddata->dclk, 0);
|
|
}
|
|
|
|
if (i < getbuf_len)
|
|
getbuf[i] = get;
|
|
|
|
ndelay(siox_bytegap_ns);
|
|
}
|
|
|
|
gpiod_set_value_cansleep(ddata->dld, 1);
|
|
ndelay(siox_loadhigh_ns);
|
|
gpiod_set_value_cansleep(ddata->dld, 0);
|
|
|
|
/*
|
|
* Resetting dout isn't necessary protocol wise, but it makes the
|
|
* signals more pretty because the dout level is deterministic between
|
|
* cycles. Note that this only affects dout between the master and the
|
|
* first siox device. dout for the later devices depend on the output of
|
|
* the previous siox device.
|
|
*/
|
|
gpiod_set_value_cansleep(ddata->dout, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int siox_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct siox_gpio_ddata *ddata;
|
|
int ret;
|
|
struct siox_master *smaster;
|
|
|
|
smaster = siox_master_alloc(&pdev->dev, sizeof(*ddata));
|
|
if (!smaster) {
|
|
dev_err(dev, "failed to allocate siox master\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, smaster);
|
|
ddata = siox_master_get_devdata(smaster);
|
|
|
|
ddata->din = devm_gpiod_get(dev, "din", GPIOD_IN);
|
|
if (IS_ERR(ddata->din)) {
|
|
ret = PTR_ERR(ddata->din);
|
|
dev_err(dev, "Failed to get %s GPIO: %d\n", "din", ret);
|
|
goto err;
|
|
}
|
|
|
|
ddata->dout = devm_gpiod_get(dev, "dout", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ddata->dout)) {
|
|
ret = PTR_ERR(ddata->dout);
|
|
dev_err(dev, "Failed to get %s GPIO: %d\n", "dout", ret);
|
|
goto err;
|
|
}
|
|
|
|
ddata->dclk = devm_gpiod_get(dev, "dclk", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ddata->dclk)) {
|
|
ret = PTR_ERR(ddata->dclk);
|
|
dev_err(dev, "Failed to get %s GPIO: %d\n", "dclk", ret);
|
|
goto err;
|
|
}
|
|
|
|
ddata->dld = devm_gpiod_get(dev, "dld", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ddata->dld)) {
|
|
ret = PTR_ERR(ddata->dld);
|
|
dev_err(dev, "Failed to get %s GPIO: %d\n", "dld", ret);
|
|
goto err;
|
|
}
|
|
|
|
smaster->pushpull = siox_gpio_pushpull;
|
|
/* XXX: determine automatically like spi does */
|
|
smaster->busno = 0;
|
|
|
|
ret = siox_master_register(smaster);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to register siox master: %d\n", ret);
|
|
err:
|
|
siox_master_put(smaster);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int siox_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct siox_master *master = platform_get_drvdata(pdev);
|
|
|
|
siox_master_unregister(master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id siox_gpio_dt_ids[] = {
|
|
{ .compatible = "eckelmann,siox-gpio", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, siox_gpio_dt_ids);
|
|
|
|
static struct platform_driver siox_gpio_driver = {
|
|
.probe = siox_gpio_probe,
|
|
.remove = siox_gpio_remove,
|
|
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = siox_gpio_dt_ids,
|
|
},
|
|
};
|
|
module_platform_driver(siox_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|