--- /dev/null
+/*
+ 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>
+#include <linux/slab.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, \
+ i2cprops.adap ? \
+ i2c_adapter_id(i2cprops.adap) : -1, \
+ 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 (((i2cadap) && (state->i2c_props.adap)) && \
+ ((i2c_adapter_id(state->i2c_props.adap) == \
+ i2c_adapter_id(i2cadap)) && \
+ (i2caddr == state->i2c_props.addr))) { \
+ __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) \
+({ \
+ int __ret; \
+ state->i2c_props.count--; \
+ __ret = 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); \
+ } \
+ __ret; \
+})
+
+#define hybrid_tuner_report_instance_count(state) \
+({ \
+ int __ret = 0; \
+ if (state) \
+ __ret = state->i2c_props.count; \
+ __ret; \
+})
+
+#endif /* __TUNER_I2C_H__ */
Code Review / kvmfornfv.git / blobdiff