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V4L/DVB (7134): tuner: create a macro for sharing state between hybrid tuner instances
Create a macro implementing a standard method to share state amongst multiple instances of a hybrid tuner object. Also, prepare tuner_foo printk macros for the removal of PREFIX Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky
Mauro Carvalho Chehab
parent
2e43c953bf
commit
3c2a0865d0
@ -26,6 +26,10 @@
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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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@ -59,29 +63,105 @@ static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
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return (ret == 2) ? ilen : ret;
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}
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#define tuner_warn(fmt, arg...) do { \
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printk(KERN_WARNING "%s %d-%04x: " fmt, PREFIX, \
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i2c_adapter_id(priv->i2c_props.adap), \
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priv->i2c_props.addr, ##arg); \
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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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i2c_adapter_id(i2cprops.adap), \
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i2cprops.addr, ##arg); \
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} while (0)
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#define tuner_info(fmt, arg...) do { \
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printk(KERN_INFO "%s %d-%04x: " fmt, PREFIX, \
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i2c_adapter_id(priv->i2c_props.adap), \
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priv->i2c_props.addr , ##arg); \
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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_err(fmt, arg...) do { \
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printk(KERN_ERR "%s %d-%04x: " fmt, PREFIX, \
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i2c_adapter_id(priv->i2c_props.adap), \
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priv->i2c_props.addr , ##arg); \
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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_dbg(fmt, arg...) do { \
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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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printk(KERN_DEBUG "%s %d-%04x: " fmt, PREFIX, \
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i2c_adapter_id(priv->i2c_props.adap), \
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priv->i2c_props.addr , ##arg); \
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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 ((i2c_adapter_id(state->i2c_props.adap) == \
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i2c_adapter_id(i2cadap)) && \
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(state->i2c_props.addr == i2caddr)) { \
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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) do { \
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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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} while (0)
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#endif /* __TUNER_I2C_H__ */
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