cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bttv-gpio.c (4209B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3
      4    bttv-gpio.c  --  gpio sub drivers
      5
      6    sysfs-based sub driver interface for bttv
      7    mainly intended for gpio access
      8
      9
     10    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
     11			   & Marcus Metzler (mocm@thp.uni-koeln.de)
     12    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
     13
     14
     15*/
     16
     17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     18
     19#include <linux/module.h>
     20#include <linux/init.h>
     21#include <linux/delay.h>
     22#include <linux/device.h>
     23#include <linux/slab.h>
     24#include <asm/io.h>
     25
     26#include "bttvp.h"
     27
     28/* ----------------------------------------------------------------------- */
     29/* internal: the bttv "bus"                                                */
     30
     31static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
     32{
     33	struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
     34	int len = strlen(sub->wanted);
     35
     36	if (0 == strncmp(dev_name(dev), sub->wanted, len))
     37		return 1;
     38	return 0;
     39}
     40
     41static int bttv_sub_probe(struct device *dev)
     42{
     43	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
     44	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
     45
     46	return sub->probe ? sub->probe(sdev) : -ENODEV;
     47}
     48
     49static void bttv_sub_remove(struct device *dev)
     50{
     51	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
     52	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
     53
     54	if (sub->remove)
     55		sub->remove(sdev);
     56}
     57
     58struct bus_type bttv_sub_bus_type = {
     59	.name   = "bttv-sub",
     60	.match  = &bttv_sub_bus_match,
     61	.probe  = bttv_sub_probe,
     62	.remove = bttv_sub_remove,
     63};
     64
     65static void release_sub_device(struct device *dev)
     66{
     67	struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
     68	kfree(sub);
     69}
     70
     71int bttv_sub_add_device(struct bttv_core *core, char *name)
     72{
     73	struct bttv_sub_device *sub;
     74	int err;
     75
     76	sub = kzalloc(sizeof(*sub),GFP_KERNEL);
     77	if (NULL == sub)
     78		return -ENOMEM;
     79
     80	sub->core        = core;
     81	sub->dev.parent  = &core->pci->dev;
     82	sub->dev.bus     = &bttv_sub_bus_type;
     83	sub->dev.release = release_sub_device;
     84	dev_set_name(&sub->dev, "%s%d", name, core->nr);
     85
     86	err = device_register(&sub->dev);
     87	if (0 != err) {
     88		put_device(&sub->dev);
     89		return err;
     90	}
     91	pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
     92	list_add_tail(&sub->list,&core->subs);
     93	return 0;
     94}
     95
     96int bttv_sub_del_devices(struct bttv_core *core)
     97{
     98	struct bttv_sub_device *sub, *save;
     99
    100	list_for_each_entry_safe(sub, save, &core->subs, list) {
    101		list_del(&sub->list);
    102		device_unregister(&sub->dev);
    103	}
    104	return 0;
    105}
    106
    107/* ----------------------------------------------------------------------- */
    108/* external: sub-driver register/unregister                                */
    109
    110int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
    111{
    112	sub->drv.bus = &bttv_sub_bus_type;
    113	snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
    114	return driver_register(&sub->drv);
    115}
    116EXPORT_SYMBOL(bttv_sub_register);
    117
    118int bttv_sub_unregister(struct bttv_sub_driver *sub)
    119{
    120	driver_unregister(&sub->drv);
    121	return 0;
    122}
    123EXPORT_SYMBOL(bttv_sub_unregister);
    124
    125/* ----------------------------------------------------------------------- */
    126/* external: gpio access functions                                         */
    127
    128void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
    129{
    130	struct bttv *btv = container_of(core, struct bttv, c);
    131	unsigned long flags;
    132	u32 data;
    133
    134	spin_lock_irqsave(&btv->gpio_lock,flags);
    135	data = btread(BT848_GPIO_OUT_EN);
    136	data = data & ~mask;
    137	data = data | (mask & outbits);
    138	btwrite(data,BT848_GPIO_OUT_EN);
    139	spin_unlock_irqrestore(&btv->gpio_lock,flags);
    140}
    141
    142u32 bttv_gpio_read(struct bttv_core *core)
    143{
    144	struct bttv *btv = container_of(core, struct bttv, c);
    145	u32 value;
    146
    147	value = btread(BT848_GPIO_DATA);
    148	return value;
    149}
    150
    151void bttv_gpio_write(struct bttv_core *core, u32 value)
    152{
    153	struct bttv *btv = container_of(core, struct bttv, c);
    154
    155	btwrite(value,BT848_GPIO_DATA);
    156}
    157
    158void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
    159{
    160	struct bttv *btv = container_of(core, struct bttv, c);
    161	unsigned long flags;
    162	u32 data;
    163
    164	spin_lock_irqsave(&btv->gpio_lock,flags);
    165	data = btread(BT848_GPIO_DATA);
    166	data = data & ~mask;
    167	data = data | (mask & bits);
    168	btwrite(data,BT848_GPIO_DATA);
    169	spin_unlock_irqrestore(&btv->gpio_lock,flags);
    170}