forked from Minki/linux
74ba9207e1
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
173 lines
5.1 KiB
C
173 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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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*/
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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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#include <linux/slab.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,
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unsigned 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,
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unsigned 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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unsigned char *obuf, int olen,
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unsigned 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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#define hybrid_tuner_report_instance_count(state) \
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({ \
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int __ret = 0; \
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if (state) \
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__ret = state->i2c_props.count; \
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__ret; \
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})
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#endif /* __TUNER_I2C_H__ */
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