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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>
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, \
i2c_adapter_id(i2cprops.adap), \
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 ((i2c_adapter_id(state->i2c_props.adap) == \
i2c_adapter_id(i2cadap)) && \
(state->i2c_props.addr == i2caddr)) { \
__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) do { \
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); \
} \
} while (0)
#endif /* __TUNER_I2C_H__ */
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