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174 lines
5.1 KiB
174 lines
5.1 KiB
/* 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 ([email protected]) |
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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 (!state) { \ |
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__ret = -ENOMEM; \ |
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goto __fail; \ |
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} \ |
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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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