linux/drivers/media/tuners/tuner-i2c.h

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/*
tuner-i2c.h - i2c interface for different tuners
Copyright (C) 2007 Michael Krufky (mkrufky@linuxtv.org)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __TUNER_I2C_H__
#define __TUNER_I2C_H__
#include <linux/i2c.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
struct tuner_i2c_props {
u8 addr;
struct i2c_adapter *adap;
/* used for tuner instance management */
int count;
char *name;
};
static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, char *buf, int len)
{
struct i2c_msg msg = { .addr = props->addr, .flags = 0,
.buf = buf, .len = len };
int ret = i2c_transfer(props->adap, &msg, 1);
return (ret == 1) ? len : ret;
}
static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, char *buf, int len)
{
struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD,
.buf = buf, .len = len };
int ret = i2c_transfer(props->adap, &msg, 1);
return (ret == 1) ? len : ret;
}
static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
char *obuf, int olen,
char *ibuf, int ilen)
{
struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0,
.buf = obuf, .len = olen },
{ .addr = props->addr, .flags = I2C_M_RD,
.buf = ibuf, .len = ilen } };
int ret = i2c_transfer(props->adap, msg, 2);
return (ret == 2) ? ilen : ret;
}
/* Callers must declare as a global for the module:
*
* static LIST_HEAD(hybrid_tuner_instance_list);
*
* hybrid_tuner_instance_list should be the third argument
* passed into hybrid_tuner_request_state().
*
* state structure must contain the following:
*
* struct list_head hybrid_tuner_instance_list;
* struct tuner_i2c_props i2c_props;
*
* hybrid_tuner_instance_list (both within state structure and globally)
* is only required if the driver is using hybrid_tuner_request_state
* and hybrid_tuner_release_state to manage state sharing between
* multiple instances of hybrid tuners.
*/
#define tuner_printk(kernlvl, i2cprops, fmt, arg...) do { \
printk(kernlvl "%s %d-%04x: " fmt, i2cprops.name, \
i2cprops.adap ? \
i2c_adapter_id(i2cprops.adap) : -1, \
i2cprops.addr, ##arg); \
} while (0)
/* TO DO: convert all callers of these macros to pass in
* struct tuner_i2c_props, then remove the macro wrappers */
#define __tuner_warn(i2cprops, fmt, arg...) do { \
tuner_printk(KERN_WARNING, i2cprops, fmt, ##arg); \
} while (0)
#define __tuner_info(i2cprops, fmt, arg...) do { \
tuner_printk(KERN_INFO, i2cprops, fmt, ##arg); \
} while (0)
#define __tuner_err(i2cprops, fmt, arg...) do { \
tuner_printk(KERN_ERR, i2cprops, fmt, ##arg); \
} while (0)
#define __tuner_dbg(i2cprops, fmt, arg...) do { \
if ((debug)) \
tuner_printk(KERN_DEBUG, i2cprops, fmt, ##arg); \
} while (0)
#define tuner_warn(fmt, arg...) __tuner_warn(priv->i2c_props, fmt, ##arg)
#define tuner_info(fmt, arg...) __tuner_info(priv->i2c_props, fmt, ##arg)
#define tuner_err(fmt, arg...) __tuner_err(priv->i2c_props, fmt, ##arg)
#define tuner_dbg(fmt, arg...) __tuner_dbg(priv->i2c_props, fmt, ##arg)
/****************************************************************************/
/* The return value of hybrid_tuner_request_state indicates the number of
* instances using this tuner object.
*
* 0 - no instances, indicates an error - kzalloc must have failed
*
* 1 - one instance, indicates that the tuner object was created successfully
*
* 2 (or more) instances, indicates that an existing tuner object was found
*/
#define hybrid_tuner_request_state(type, state, list, i2cadap, i2caddr, devname)\
({ \
int __ret = 0; \
list_for_each_entry(state, &list, hybrid_tuner_instance_list) { \
if (((i2cadap) && (state->i2c_props.adap)) && \
((i2c_adapter_id(state->i2c_props.adap) == \
i2c_adapter_id(i2cadap)) && \
(i2caddr == state->i2c_props.addr))) { \
__tuner_info(state->i2c_props, \
"attaching existing instance\n"); \
state->i2c_props.count++; \
__ret = state->i2c_props.count; \
break; \
} \
} \
if (0 == __ret) { \
state = kzalloc(sizeof(type), GFP_KERNEL); \
if (NULL == state) \
goto __fail; \
state->i2c_props.addr = i2caddr; \
state->i2c_props.adap = i2cadap; \
state->i2c_props.name = devname; \
__tuner_info(state->i2c_props, \
"creating new instance\n"); \
list_add_tail(&state->hybrid_tuner_instance_list, &list);\
state->i2c_props.count++; \
__ret = state->i2c_props.count; \
} \
__fail: \
__ret; \
})
#define hybrid_tuner_release_state(state) \
({ \
int __ret; \
state->i2c_props.count--; \
__ret = state->i2c_props.count; \
if (!state->i2c_props.count) { \
__tuner_info(state->i2c_props, "destroying instance\n");\
list_del(&state->hybrid_tuner_instance_list); \
kfree(state); \
} \
__ret; \
})
#define hybrid_tuner_report_instance_count(state) \
({ \
int __ret = 0; \
if (state) \
__ret = state->i2c_props.count; \
__ret; \
})
#endif /* __TUNER_I2C_H__ */