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linux/drivers/pnp/card.c
Linus Torvalds eed0218e8c Char / Misc driver updates for 5.14-rc1
Here is the big set of char / misc and other driver subsystem updates
 for 5.14-rc1.  Included in here are:
 	- habanna driver updates
 	- fsl-mc driver updates
 	- comedi driver updates
 	- fpga driver updates
 	- extcon driver updates
 	- interconnect driver updates
 	- mei driver updates
 	- nvmem driver updates
 	- phy driver updates
 	- pnp driver updates
 	- soundwire driver updates
 	- lots of other tiny driver updates for char and misc drivers
 
 This is looking more and more like the "various driver subsystems mushed
 together" tree...
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char / misc driver updates from Greg KH:
 "Here is the big set of char / misc and other driver subsystem updates
  for 5.14-rc1. Included in here are:

   - habanalabs driver updates

   - fsl-mc driver updates

   - comedi driver updates

   - fpga driver updates

   - extcon driver updates

   - interconnect driver updates

   - mei driver updates

   - nvmem driver updates

   - phy driver updates

   - pnp driver updates

   - soundwire driver updates

   - lots of other tiny driver updates for char and misc drivers

  This is looking more and more like the "various driver subsystems
  mushed together" tree...

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (292 commits)
  mcb: Use DEFINE_RES_MEM() helper macro and fix the end address
  PNP: moved EXPORT_SYMBOL so that it immediately followed its function/variable
  bus: mhi: pci-generic: Add missing 'pci_disable_pcie_error_reporting()' calls
  bus: mhi: Wait for M2 state during system resume
  bus: mhi: core: Fix power down latency
  intel_th: Wait until port is in reset before programming it
  intel_th: msu: Make contiguous buffers uncached
  intel_th: Remove an unused exit point from intel_th_remove()
  stm class: Spelling fix
  nitro_enclaves: Set Bus Master for the NE PCI device
  misc: ibmasm: Modify matricies to matrices
  misc: vmw_vmci: return the correct errno code
  siox: Simplify error handling via dev_err_probe()
  fpga: machxo2-spi: Address warning about unused variable
  lkdtm/heap: Add init_on_alloc tests
  selftests/lkdtm: Enable various testable CONFIGs
  lkdtm: Add CONFIG hints in errors where possible
  lkdtm: Enable DOUBLE_FAULT on all architectures
  lkdtm/heap: Add vmalloc linear overflow test
  lkdtm/bugs: XFAIL UNALIGNED_LOAD_STORE_WRITE
  ...
2021-07-05 13:42:16 -07:00

458 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* card.c - contains functions for managing groups of PnP devices
*
* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
*/
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/pnp.h>
#include <linux/dma-mapping.h>
#include "base.h"
LIST_HEAD(pnp_cards);
static LIST_HEAD(pnp_card_drivers);
static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
struct pnp_card *card)
{
const struct pnp_card_device_id *drv_id = drv->id_table;
while (*drv_id->id) {
if (compare_pnp_id(card->id, drv_id->id)) {
int i = 0;
for (;;) {
int found;
struct pnp_dev *dev;
if (i == PNP_MAX_DEVICES ||
!*drv_id->devs[i].id)
return drv_id;
found = 0;
card_for_each_dev(card, dev) {
if (compare_pnp_id(dev->id,
drv_id->devs[i].id)) {
found = 1;
break;
}
}
if (!found)
break;
i++;
}
}
drv_id++;
}
return NULL;
}
static void card_remove(struct pnp_dev *dev)
{
dev->card_link = NULL;
}
static void card_remove_first(struct pnp_dev *dev)
{
struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
if (!dev->card || !drv)
return;
if (drv->remove)
drv->remove(dev->card_link);
drv->link.remove = &card_remove;
kfree(dev->card_link);
card_remove(dev);
}
static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
{
const struct pnp_card_device_id *id;
struct pnp_card_link *clink;
struct pnp_dev *dev;
if (!drv->probe)
return 0;
id = match_card(drv, card);
if (!id)
return 0;
clink = kzalloc(sizeof(*clink), GFP_KERNEL);
if (!clink)
return 0;
clink->card = card;
clink->driver = drv;
clink->pm_state = PMSG_ON;
if (drv->probe(clink, id) >= 0)
return 1;
/* Recovery */
card_for_each_dev(card, dev) {
if (dev->card_link == clink)
pnp_release_card_device(dev);
}
kfree(clink);
return 0;
}
/**
* pnp_add_card_id - adds an EISA id to the specified card
* @id: pointer to a pnp_id structure
* @card: pointer to the desired card
*/
static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
{
struct pnp_id *dev_id, *ptr;
dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
if (!dev_id)
return NULL;
dev_id->id[0] = id[0];
dev_id->id[1] = id[1];
dev_id->id[2] = id[2];
dev_id->id[3] = tolower(id[3]);
dev_id->id[4] = tolower(id[4]);
dev_id->id[5] = tolower(id[5]);
dev_id->id[6] = tolower(id[6]);
dev_id->id[7] = '\0';
dev_id->next = NULL;
ptr = card->id;
while (ptr && ptr->next)
ptr = ptr->next;
if (ptr)
ptr->next = dev_id;
else
card->id = dev_id;
return dev_id;
}
static void pnp_free_card_ids(struct pnp_card *card)
{
struct pnp_id *id;
struct pnp_id *next;
id = card->id;
while (id) {
next = id->next;
kfree(id);
id = next;
}
}
static void pnp_release_card(struct device *dmdev)
{
struct pnp_card *card = to_pnp_card(dmdev);
pnp_free_card_ids(card);
kfree(card);
}
struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
{
struct pnp_card *card;
struct pnp_id *dev_id;
card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
if (!card)
return NULL;
card->protocol = protocol;
card->number = id;
card->dev.parent = &card->protocol->dev;
dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);
card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
card->dev.dma_mask = &card->dev.coherent_dma_mask;
dev_id = pnp_add_card_id(card, pnpid);
if (!dev_id) {
kfree(card);
return NULL;
}
return card;
}
static ssize_t name_show(struct device *dmdev,
struct device_attribute *attr, char *buf)
{
char *str = buf;
struct pnp_card *card = to_pnp_card(dmdev);
str += sprintf(str, "%s\n", card->name);
return (str - buf);
}
static DEVICE_ATTR_RO(name);
static ssize_t card_id_show(struct device *dmdev,
struct device_attribute *attr, char *buf)
{
char *str = buf;
struct pnp_card *card = to_pnp_card(dmdev);
struct pnp_id *pos = card->id;
while (pos) {
str += sprintf(str, "%s\n", pos->id);
pos = pos->next;
}
return (str - buf);
}
static DEVICE_ATTR_RO(card_id);
static int pnp_interface_attach_card(struct pnp_card *card)
{
int rc = device_create_file(&card->dev, &dev_attr_name);
if (rc)
return rc;
rc = device_create_file(&card->dev, &dev_attr_card_id);
if (rc)
goto err_name;
return 0;
err_name:
device_remove_file(&card->dev, &dev_attr_name);
return rc;
}
/**
* pnp_add_card - adds a PnP card to the PnP Layer
* @card: pointer to the card to add
*/
int pnp_add_card(struct pnp_card *card)
{
int error;
struct list_head *pos, *temp;
card->dev.bus = NULL;
card->dev.release = &pnp_release_card;
error = device_register(&card->dev);
if (error) {
dev_err(&card->dev, "could not register (err=%d)\n", error);
put_device(&card->dev);
return error;
}
pnp_interface_attach_card(card);
mutex_lock(&pnp_lock);
list_add_tail(&card->global_list, &pnp_cards);
list_add_tail(&card->protocol_list, &card->protocol->cards);
mutex_unlock(&pnp_lock);
/* we wait until now to add devices in order to ensure the drivers
* will be able to use all of the related devices on the card
* without waiting an unreasonable length of time */
list_for_each(pos, &card->devices) {
struct pnp_dev *dev = card_to_pnp_dev(pos);
__pnp_add_device(dev);
}
/* match with card drivers */
list_for_each_safe(pos, temp, &pnp_card_drivers) {
struct pnp_card_driver *drv =
list_entry(pos, struct pnp_card_driver,
global_list);
card_probe(card, drv);
}
return 0;
}
/**
* pnp_remove_card - removes a PnP card from the PnP Layer
* @card: pointer to the card to remove
*/
void pnp_remove_card(struct pnp_card *card)
{
struct list_head *pos, *temp;
device_unregister(&card->dev);
mutex_lock(&pnp_lock);
list_del(&card->global_list);
list_del(&card->protocol_list);
mutex_unlock(&pnp_lock);
list_for_each_safe(pos, temp, &card->devices) {
struct pnp_dev *dev = card_to_pnp_dev(pos);
pnp_remove_card_device(dev);
}
}
/**
* pnp_add_card_device - adds a device to the specified card
* @card: pointer to the card to add to
* @dev: pointer to the device to add
*/
int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
{
dev->dev.parent = &card->dev;
dev->card_link = NULL;
dev_set_name(&dev->dev, "%02x:%02x.%02x",
dev->protocol->number, card->number, dev->number);
mutex_lock(&pnp_lock);
dev->card = card;
list_add_tail(&dev->card_list, &card->devices);
mutex_unlock(&pnp_lock);
return 0;
}
/**
* pnp_remove_card_device- removes a device from the specified card
* @dev: pointer to the device to remove
*/
void pnp_remove_card_device(struct pnp_dev *dev)
{
mutex_lock(&pnp_lock);
dev->card = NULL;
list_del(&dev->card_list);
mutex_unlock(&pnp_lock);
__pnp_remove_device(dev);
}
/**
* pnp_request_card_device - Searches for a PnP device under the specified card
* @clink: pointer to the card link, cannot be NULL
* @id: pointer to a PnP ID structure that explains the rules for finding the device
* @from: Starting place to search from. If NULL it will start from the beginning.
*/
struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
const char *id, struct pnp_dev *from)
{
struct list_head *pos;
struct pnp_dev *dev;
struct pnp_card_driver *drv;
struct pnp_card *card;
if (!clink || !id)
return NULL;
card = clink->card;
drv = clink->driver;
if (!from) {
pos = card->devices.next;
} else {
if (from->card != card)
return NULL;
pos = from->card_list.next;
}
while (pos != &card->devices) {
dev = card_to_pnp_dev(pos);
if ((!dev->card_link) && compare_pnp_id(dev->id, id))
goto found;
pos = pos->next;
}
return NULL;
found:
dev->card_link = clink;
dev->dev.driver = &drv->link.driver;
if (pnp_bus_type.probe(&dev->dev))
goto err_out;
if (device_bind_driver(&dev->dev))
goto err_out;
return dev;
err_out:
dev->dev.driver = NULL;
dev->card_link = NULL;
return NULL;
}
EXPORT_SYMBOL(pnp_request_card_device);
/**
* pnp_release_card_device - call this when the driver no longer needs the device
* @dev: pointer to the PnP device structure
*/
void pnp_release_card_device(struct pnp_dev *dev)
{
struct pnp_card_driver *drv = dev->card_link->driver;
drv->link.remove = &card_remove;
device_release_driver(&dev->dev);
drv->link.remove = &card_remove_first;
}
EXPORT_SYMBOL(pnp_release_card_device);
/*
* suspend/resume callbacks
*/
static int card_suspend(struct pnp_dev *dev, pm_message_t state)
{
struct pnp_card_link *link = dev->card_link;
if (link->pm_state.event == state.event)
return 0;
link->pm_state = state;
return link->driver->suspend(link, state);
}
static int card_resume(struct pnp_dev *dev)
{
struct pnp_card_link *link = dev->card_link;
if (link->pm_state.event == PM_EVENT_ON)
return 0;
link->pm_state = PMSG_ON;
link->driver->resume(link);
return 0;
}
/**
* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
* @drv: pointer to the driver to register
*/
int pnp_register_card_driver(struct pnp_card_driver *drv)
{
int error;
struct list_head *pos, *temp;
drv->link.name = drv->name;
drv->link.id_table = NULL; /* this will disable auto matching */
drv->link.flags = drv->flags;
drv->link.probe = NULL;
drv->link.remove = &card_remove_first;
drv->link.suspend = drv->suspend ? card_suspend : NULL;
drv->link.resume = drv->resume ? card_resume : NULL;
error = pnp_register_driver(&drv->link);
if (error < 0)
return error;
mutex_lock(&pnp_lock);
list_add_tail(&drv->global_list, &pnp_card_drivers);
mutex_unlock(&pnp_lock);
list_for_each_safe(pos, temp, &pnp_cards) {
struct pnp_card *card =
list_entry(pos, struct pnp_card, global_list);
card_probe(card, drv);
}
return 0;
}
EXPORT_SYMBOL(pnp_register_card_driver);
/**
* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
* @drv: pointer to the driver to unregister
*/
void pnp_unregister_card_driver(struct pnp_card_driver *drv)
{
mutex_lock(&pnp_lock);
list_del(&drv->global_list);
mutex_unlock(&pnp_lock);
pnp_unregister_driver(&drv->link);
}
EXPORT_SYMBOL(pnp_unregister_card_driver);