+==============
+Driver changes
+==============
+
This file details changes in 2.6 which affect PCMCIA card driver authors:
+
* pcmcia_loop_config() and autoconfiguration (as of 2.6.36)
- If struct pcmcia_device *p_dev->config_flags is set accordingly,
+ If `struct pcmcia_device *p_dev->config_flags` is set accordingly,
pcmcia_loop_config() now sets up certain configuration values
automatically, though the driver may still override the settings
in the callback function. The following autoconfiguration options
are provided at the moment:
- CONF_AUTO_CHECK_VCC : check for matching Vcc
- CONF_AUTO_SET_VPP : set Vpp
- CONF_AUTO_AUDIO : auto-enable audio line, if required
- CONF_AUTO_SET_IO : set ioport resources (->resource[0,1])
- CONF_AUTO_SET_IOMEM : set first iomem resource (->resource[2])
+
+ - CONF_AUTO_CHECK_VCC : check for matching Vcc
+ - CONF_AUTO_SET_VPP : set Vpp
+ - CONF_AUTO_AUDIO : auto-enable audio line, if required
+ - CONF_AUTO_SET_IO : set ioport resources (->resource[0,1])
+ - CONF_AUTO_SET_IOMEM : set first iomem resource (->resource[2])
* pcmcia_request_configuration -> pcmcia_enable_device (as of 2.6.36)
pcmcia_request_configuration() got renamed to pcmcia_enable_device(),
* pcmcia_request_window changes (as of 2.6.36)
Instead of win_req_t, drivers are now requested to fill out
- struct pcmcia_device *p_dev->resource[2,3,4,5] for up to four ioport
+ `struct pcmcia_device *p_dev->resource[2,3,4,5]` for up to four ioport
ranges. After a call to pcmcia_request_window(), the regions found there
are reserved and may be used immediately -- until pcmcia_release_window()
is called.
* pcmcia_request_io changes (as of 2.6.36)
Instead of io_req_t, drivers are now requested to fill out
- struct pcmcia_device *p_dev->resource[0,1] for up to two ioport
+ `struct pcmcia_device *p_dev->resource[0,1]` for up to two ioport
ranges. After a call to pcmcia_request_io(), the ports found there
are reserved, after calling pcmcia_request_configuration(), they may
be used.
* New IRQ request rules (as of 2.6.35)
Instead of the old pcmcia_request_irq() interface, drivers may now
choose between:
- - calling request_irq/free_irq directly. Use the IRQ from *p_dev->irq.
+
+ - calling request_irq/free_irq directly. Use the IRQ from `*p_dev->irq`.
- use pcmcia_request_irq(p_dev, handler_t); the PCMCIA core will
clean up automatically on calls to pcmcia_disable_device() or
device ejection.
exports for them were removed.
* Unify detach and REMOVAL event code, as well as attach and INSERTION
- code (as of 2.6.16)
+ code (as of 2.6.16)::
+
void (*remove) (struct pcmcia_device *dev);
int (*probe) (struct pcmcia_device *dev);
-* Move suspend, resume and reset out of event handler (as of 2.6.16)
+* Move suspend, resume and reset out of event handler (as of 2.6.16)::
+
int (*suspend) (struct pcmcia_device *dev);
int (*resume) (struct pcmcia_device *dev);
+
should be initialized in struct pcmcia_driver, and handle
(SUSPEND == RESET_PHYSICAL) and (RESUME == CARD_RESET) events
* core functions no longer available (as of 2.6.11)
The following functions have been removed from the kernel source
because they are unused by all in-kernel drivers, and no external
- driver was reported to rely on them:
+ driver was reported to rely on them::
+
pcmcia_get_first_region()
pcmcia_get_next_region()
pcmcia_modify_window()
+=============
PCMCIA Driver
--------------
-
+=============
sysfs
-----
New PCMCIA IDs may be added to a device driver pcmcia_device_id table at
-runtime as shown below:
+runtime as shown below::
-echo "match_flags manf_id card_id func_id function device_no \
-prod_id_hash[0] prod_id_hash[1] prod_id_hash[2] prod_id_hash[3]" > \
-/sys/bus/pcmcia/drivers/{driver}/new_id
+ echo "match_flags manf_id card_id func_id function device_no \
+ prod_id_hash[0] prod_id_hash[1] prod_id_hash[2] prod_id_hash[3]" > \
+ /sys/bus/pcmcia/drivers/{driver}/new_id
All fields are passed in as hexadecimal values (no leading 0x).
The meaning is described in the PCMCIA specification, the match_flags is
A common use-case is to add a new device according to the manufacturer ID
and the card ID (form the manf_id and card_id file in the device tree).
-For this, just use:
+For this, just use::
-echo "0x3 manf_id card_id 0 0 0 0 0 0 0" > \
- /sys/bus/pcmcia/drivers/{driver}/new_id
+ echo "0x3 manf_id card_id 0 0 0 0 0 0 0" > \
+ /sys/bus/pcmcia/drivers/{driver}/new_id
after loading the driver.
+=======
+Locking
+=======
+
This file explains the locking and exclusion scheme used in the PCCARD
and PCMCIA subsystems.
A) Overview, Locking Hierarchy:
===============================
-pcmcia_socket_list_rwsem - protects only the list of sockets
-- skt_mutex - serializes card insert / ejection
- - ops_mutex - serializes socket operation
+pcmcia_socket_list_rwsem
+ - protects only the list of sockets
+
+- skt_mutex
+ - serializes card insert / ejection
+
+ - ops_mutex
+ - serializes socket operation
B) Exclusion
============
The following functions and callbacks to struct pcmcia_socket must
-be called with "skt_mutex" held:
+be called with "skt_mutex" held::
socket_detect_change()
send_event()
struct pcmcia_callback *callback
The following functions and callbacks to struct pcmcia_socket must
-be called with "ops_mutex" held:
+be called with "ops_mutex" held::
socket_reset()
socket_setup()
struct pccard_operations *ops
struct pccard_resource_ops *resource_ops;
-Note that send_event() and struct pcmcia_callback *callback must not be
+Note that send_event() and `struct pcmcia_callback *callback` must not be
called with "ops_mutex" held.
The "main" struct pcmcia_socket is protected as follows (read-only fields
or single-use fields not mentioned):
-- by pcmcia_socket_list_rwsem:
+- by pcmcia_socket_list_rwsem::
+
struct list_head socket_list;
-- by thread_lock:
+- by thread_lock::
+
unsigned int thread_events;
-- by skt_mutex:
+- by skt_mutex::
+
u_int suspended_state;
void (*tune_bridge);
struct pcmcia_callback *callback;
int resume_status;
-- by ops_mutex:
+- by ops_mutex::
+
socket_state_t socket;
u_int state;
u_short lock_count;
or single-use fields not mentioned):
-- by pcmcia_socket->ops_mutex:
+- by pcmcia_socket->ops_mutex::
+
struct list_head socket_device_list;
struct config_t *function_config;
u16 _irq:1;
u16 suspended:1;
u16 _removed:1;
-- by the PCMCIA driver:
+- by the PCMCIA driver::
+
io_req_t io;
irq_req_t irq;
config_req_t conf;
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