1 /*
2 tuner-i2c.h - i2c interface for different tuners
3
4 Copyright (C) 2007 Michael Krufky (mkrufky@linuxtv.org)
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #ifndef __TUNER_I2C_H__
22 #define __TUNER_I2C_H__
23
24 #include <linux/i2c.h>
25 #include <linux/slab.h>
26
27 struct tuner_i2c_props {
28 u8 addr;
29 struct i2c_adapter *adap;
30
31 /* used for tuner instance management */
32 int count;
33 char *name;
34 };
35
tuner_i2c_xfer_send(struct tuner_i2c_props * props,char * buf,int len)36 static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, char *buf, int len)
37 {
38 struct i2c_msg msg = { .addr = props->addr, .flags = 0,
39 .buf = buf, .len = len };
40 int ret = i2c_transfer(props->adap, &msg, 1);
41
42 return (ret == 1) ? len : ret;
43 }
44
tuner_i2c_xfer_recv(struct tuner_i2c_props * props,char * buf,int len)45 static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, char *buf, int len)
46 {
47 struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD,
48 .buf = buf, .len = len };
49 int ret = i2c_transfer(props->adap, &msg, 1);
50
51 return (ret == 1) ? len : ret;
52 }
53
tuner_i2c_xfer_send_recv(struct tuner_i2c_props * props,char * obuf,int olen,char * ibuf,int ilen)54 static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
55 char *obuf, int olen,
56 char *ibuf, int ilen)
57 {
58 struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0,
59 .buf = obuf, .len = olen },
60 { .addr = props->addr, .flags = I2C_M_RD,
61 .buf = ibuf, .len = ilen } };
62 int ret = i2c_transfer(props->adap, msg, 2);
63
64 return (ret == 2) ? ilen : ret;
65 }
66
67 /* Callers must declare as a global for the module:
68 *
69 * static LIST_HEAD(hybrid_tuner_instance_list);
70 *
71 * hybrid_tuner_instance_list should be the third argument
72 * passed into hybrid_tuner_request_state().
73 *
74 * state structure must contain the following:
75 *
76 * struct list_head hybrid_tuner_instance_list;
77 * struct tuner_i2c_props i2c_props;
78 *
79 * hybrid_tuner_instance_list (both within state structure and globally)
80 * is only required if the driver is using hybrid_tuner_request_state
81 * and hybrid_tuner_release_state to manage state sharing between
82 * multiple instances of hybrid tuners.
83 */
84
85 #define tuner_printk(kernlvl, i2cprops, fmt, arg...) do { \
86 printk(kernlvl "%s %d-%04x: " fmt, i2cprops.name, \
87 i2cprops.adap ? \
88 i2c_adapter_id(i2cprops.adap) : -1, \
89 i2cprops.addr, ##arg); \
90 } while (0)
91
92 /* TO DO: convert all callers of these macros to pass in
93 * struct tuner_i2c_props, then remove the macro wrappers */
94
95 #define __tuner_warn(i2cprops, fmt, arg...) do { \
96 tuner_printk(KERN_WARNING, i2cprops, fmt, ##arg); \
97 } while (0)
98
99 #define __tuner_info(i2cprops, fmt, arg...) do { \
100 tuner_printk(KERN_INFO, i2cprops, fmt, ##arg); \
101 } while (0)
102
103 #define __tuner_err(i2cprops, fmt, arg...) do { \
104 tuner_printk(KERN_ERR, i2cprops, fmt, ##arg); \
105 } while (0)
106
107 #define __tuner_dbg(i2cprops, fmt, arg...) do { \
108 if ((debug)) \
109 tuner_printk(KERN_DEBUG, i2cprops, fmt, ##arg); \
110 } while (0)
111
112 #define tuner_warn(fmt, arg...) __tuner_warn(priv->i2c_props, fmt, ##arg)
113 #define tuner_info(fmt, arg...) __tuner_info(priv->i2c_props, fmt, ##arg)
114 #define tuner_err(fmt, arg...) __tuner_err(priv->i2c_props, fmt, ##arg)
115 #define tuner_dbg(fmt, arg...) __tuner_dbg(priv->i2c_props, fmt, ##arg)
116
117 /****************************************************************************/
118
119 /* The return value of hybrid_tuner_request_state indicates the number of
120 * instances using this tuner object.
121 *
122 * 0 - no instances, indicates an error - kzalloc must have failed
123 *
124 * 1 - one instance, indicates that the tuner object was created successfully
125 *
126 * 2 (or more) instances, indicates that an existing tuner object was found
127 */
128
129 #define hybrid_tuner_request_state(type, state, list, i2cadap, i2caddr, devname)\
130 ({ \
131 int __ret = 0; \
132 list_for_each_entry(state, &list, hybrid_tuner_instance_list) { \
133 if (((i2cadap) && (state->i2c_props.adap)) && \
134 ((i2c_adapter_id(state->i2c_props.adap) == \
135 i2c_adapter_id(i2cadap)) && \
136 (i2caddr == state->i2c_props.addr))) { \
137 __tuner_info(state->i2c_props, \
138 "attaching existing instance\n"); \
139 state->i2c_props.count++; \
140 __ret = state->i2c_props.count; \
141 break; \
142 } \
143 } \
144 if (0 == __ret) { \
145 state = kzalloc(sizeof(type), GFP_KERNEL); \
146 if (NULL == state) \
147 goto __fail; \
148 state->i2c_props.addr = i2caddr; \
149 state->i2c_props.adap = i2cadap; \
150 state->i2c_props.name = devname; \
151 __tuner_info(state->i2c_props, \
152 "creating new instance\n"); \
153 list_add_tail(&state->hybrid_tuner_instance_list, &list);\
154 state->i2c_props.count++; \
155 __ret = state->i2c_props.count; \
156 } \
157 __fail: \
158 __ret; \
159 })
160
161 #define hybrid_tuner_release_state(state) \
162 ({ \
163 int __ret; \
164 state->i2c_props.count--; \
165 __ret = state->i2c_props.count; \
166 if (!state->i2c_props.count) { \
167 __tuner_info(state->i2c_props, "destroying instance\n");\
168 list_del(&state->hybrid_tuner_instance_list); \
169 kfree(state); \
170 } \
171 __ret; \
172 })
173
174 #define hybrid_tuner_report_instance_count(state) \
175 ({ \
176 int __ret = 0; \
177 if (state) \
178 __ret = state->i2c_props.count; \
179 __ret; \
180 })
181
182 #endif /* __TUNER_I2C_H__ */
183