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db8a6956 MK |
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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
db8a6956 MK |
26 | |
27 | struct tuner_i2c_props { | |
28 | u8 addr; | |
29 | struct i2c_adapter *adap; | |
3c2a0865 MK |
30 | |
31 | /* used for tuner instance management */ | |
32 | int count; | |
33 | char *name; | |
db8a6956 MK |
34 | }; |
35 | ||
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 | ||
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 | ||
7d58d111 CP |
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 | ||
3c2a0865 MK |
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, \ | |
ab6c46e2 MK |
87 | i2cprops.adap ? \ |
88 | i2c_adapter_id(i2cprops.adap) : -1, \ | |
3c2a0865 | 89 | i2cprops.addr, ##arg); \ |
98883cdc MCC |
90 | } while (0) |
91 | ||
3c2a0865 MK |
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); \ | |
98883cdc MCC |
97 | } while (0) |
98 | ||
3c2a0865 MK |
99 | #define __tuner_info(i2cprops, fmt, arg...) do { \ |
100 | tuner_printk(KERN_INFO, i2cprops, fmt, ##arg); \ | |
98883cdc MCC |
101 | } while (0) |
102 | ||
3c2a0865 MK |
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 { \ | |
98883cdc | 108 | if ((debug)) \ |
3c2a0865 | 109 | tuner_printk(KERN_DEBUG, i2cprops, fmt, ##arg); \ |
98883cdc | 110 | } while (0) |
db8a6956 | 111 | |
3c2a0865 MK |
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) { \ | |
cac2b0eb MK |
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))) { \ | |
3c2a0865 MK |
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 | ||
c1b4d927 MK |
161 | #define hybrid_tuner_release_state(state) \ |
162 | ({ \ | |
163 | int __ret; \ | |
3c2a0865 | 164 | state->i2c_props.count--; \ |
c1b4d927 | 165 | __ret = state->i2c_props.count; \ |
3c2a0865 MK |
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 | } \ | |
c1b4d927 MK |
171 | __ret; \ |
172 | }) | |
3c2a0865 | 173 | |
9adea1c0 MK |
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 | ||
db8a6956 | 182 | #endif /* __TUNER_I2C_H__ */ |