V4L/DVB(7767): Move tuners to common/tuners
There were several issues in the past, caused by the hybrid tuner design, since now, the same tuner can be used by drivers/media/dvb and drivers/media/video. Kconfig items were rearranged, to split V4L/DVB core from their drivers. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab
173
drivers/media/common/tuners/tuner-i2c.h
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173
drivers/media/common/tuners/tuner-i2c.h
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/*
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tuner-i2c.h - i2c interface for different tuners
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Copyright (C) 2007 Michael Krufky (mkrufky@linuxtv.org)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __TUNER_I2C_H__
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#define __TUNER_I2C_H__
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#include <linux/i2c.h>
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struct tuner_i2c_props {
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u8 addr;
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struct i2c_adapter *adap;
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/* used for tuner instance management */
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int count;
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char *name;
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};
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static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, char *buf, int len)
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{
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struct i2c_msg msg = { .addr = props->addr, .flags = 0,
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.buf = buf, .len = len };
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int ret = i2c_transfer(props->adap, &msg, 1);
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return (ret == 1) ? len : ret;
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}
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static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, char *buf, int len)
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{
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struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD,
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.buf = buf, .len = len };
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int ret = i2c_transfer(props->adap, &msg, 1);
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return (ret == 1) ? len : ret;
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}
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static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
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char *obuf, int olen,
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char *ibuf, int ilen)
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{
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struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0,
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.buf = obuf, .len = olen },
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{ .addr = props->addr, .flags = I2C_M_RD,
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.buf = ibuf, .len = ilen } };
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int ret = i2c_transfer(props->adap, msg, 2);
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return (ret == 2) ? ilen : ret;
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}
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/* Callers must declare as a global for the module:
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*
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* static LIST_HEAD(hybrid_tuner_instance_list);
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*
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* hybrid_tuner_instance_list should be the third argument
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* passed into hybrid_tuner_request_state().
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*
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* state structure must contain the following:
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*
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* struct list_head hybrid_tuner_instance_list;
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* struct tuner_i2c_props i2c_props;
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*
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* hybrid_tuner_instance_list (both within state structure and globally)
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* is only required if the driver is using hybrid_tuner_request_state
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* and hybrid_tuner_release_state to manage state sharing between
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* multiple instances of hybrid tuners.
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*/
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#define tuner_printk(kernlvl, i2cprops, fmt, arg...) do { \
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printk(kernlvl "%s %d-%04x: " fmt, i2cprops.name, \
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i2cprops.adap ? \
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i2c_adapter_id(i2cprops.adap) : -1, \
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i2cprops.addr, ##arg); \
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} while (0)
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/* TO DO: convert all callers of these macros to pass in
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* struct tuner_i2c_props, then remove the macro wrappers */
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#define __tuner_warn(i2cprops, fmt, arg...) do { \
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tuner_printk(KERN_WARNING, i2cprops, fmt, ##arg); \
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} while (0)
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#define __tuner_info(i2cprops, fmt, arg...) do { \
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tuner_printk(KERN_INFO, i2cprops, fmt, ##arg); \
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} while (0)
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#define __tuner_err(i2cprops, fmt, arg...) do { \
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tuner_printk(KERN_ERR, i2cprops, fmt, ##arg); \
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} while (0)
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#define __tuner_dbg(i2cprops, fmt, arg...) do { \
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if ((debug)) \
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tuner_printk(KERN_DEBUG, i2cprops, fmt, ##arg); \
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} while (0)
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#define tuner_warn(fmt, arg...) __tuner_warn(priv->i2c_props, fmt, ##arg)
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#define tuner_info(fmt, arg...) __tuner_info(priv->i2c_props, fmt, ##arg)
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#define tuner_err(fmt, arg...) __tuner_err(priv->i2c_props, fmt, ##arg)
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#define tuner_dbg(fmt, arg...) __tuner_dbg(priv->i2c_props, fmt, ##arg)
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/****************************************************************************/
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/* The return value of hybrid_tuner_request_state indicates the number of
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* instances using this tuner object.
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*
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* 0 - no instances, indicates an error - kzalloc must have failed
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*
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* 1 - one instance, indicates that the tuner object was created successfully
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*
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* 2 (or more) instances, indicates that an existing tuner object was found
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*/
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#define hybrid_tuner_request_state(type, state, list, i2cadap, i2caddr, devname)\
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({ \
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int __ret = 0; \
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list_for_each_entry(state, &list, hybrid_tuner_instance_list) { \
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if (((i2cadap) && (state->i2c_props.adap)) && \
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((i2c_adapter_id(state->i2c_props.adap) == \
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i2c_adapter_id(i2cadap)) && \
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(i2caddr == state->i2c_props.addr))) { \
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__tuner_info(state->i2c_props, \
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"attaching existing instance\n"); \
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state->i2c_props.count++; \
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__ret = state->i2c_props.count; \
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break; \
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} \
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} \
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if (0 == __ret) { \
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state = kzalloc(sizeof(type), GFP_KERNEL); \
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if (NULL == state) \
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goto __fail; \
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state->i2c_props.addr = i2caddr; \
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state->i2c_props.adap = i2cadap; \
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state->i2c_props.name = devname; \
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__tuner_info(state->i2c_props, \
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"creating new instance\n"); \
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list_add_tail(&state->hybrid_tuner_instance_list, &list);\
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state->i2c_props.count++; \
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__ret = state->i2c_props.count; \
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} \
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__fail: \
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__ret; \
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})
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#define hybrid_tuner_release_state(state) \
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({ \
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int __ret; \
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state->i2c_props.count--; \
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__ret = state->i2c_props.count; \
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if (!state->i2c_props.count) { \
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__tuner_info(state->i2c_props, "destroying instance\n");\
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list_del(&state->hybrid_tuner_instance_list); \
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kfree(state); \
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} \
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__ret; \
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})
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#endif /* __TUNER_I2C_H__ */
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