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9f291634 JC |
1 | /* |
2 | * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved. | |
3 | * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. | |
4 | ||
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public | |
7 | * License as published by the Free Software Foundation; | |
8 | * either version 2, or (at your option) any later version. | |
9 | ||
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even | |
12 | * the implied warranty of MERCHANTABILITY or FITNESS FOR | |
13 | * A PARTICULAR PURPOSE.See the GNU General Public License | |
14 | * 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., | |
19 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include "global.h" | |
23 | ||
24 | static void via_i2c_setscl(void *data, int state) | |
25 | { | |
26 | u8 val; | |
27 | struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; | |
28 | ||
29 | val = viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0xF0; | |
30 | if (state) | |
31 | val |= 0x20; | |
32 | else | |
33 | val &= ~0x20; | |
34 | switch (via_i2c_chan->i2c_port) { | |
35 | case I2CPORTINDEX: | |
36 | val |= 0x01; | |
37 | break; | |
38 | case GPIOPORTINDEX: | |
39 | val |= 0x80; | |
40 | break; | |
41 | default: | |
42 | DEBUG_MSG("via_i2c: specify wrong i2c port.\n"); | |
43 | } | |
44 | viafb_write_reg(via_i2c_chan->i2c_port, VIASR, val); | |
45 | } | |
46 | ||
47 | static int via_i2c_getscl(void *data) | |
48 | { | |
49 | struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; | |
50 | ||
51 | if (viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0x08) | |
52 | return 1; | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int via_i2c_getsda(void *data) | |
57 | { | |
58 | struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; | |
59 | ||
60 | if (viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0x04) | |
61 | return 1; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void via_i2c_setsda(void *data, int state) | |
66 | { | |
67 | u8 val; | |
68 | struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; | |
69 | ||
70 | val = viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0xF0; | |
71 | if (state) | |
72 | val |= 0x10; | |
73 | else | |
74 | val &= ~0x10; | |
75 | switch (via_i2c_chan->i2c_port) { | |
76 | case I2CPORTINDEX: | |
77 | val |= 0x01; | |
78 | break; | |
79 | case GPIOPORTINDEX: | |
80 | val |= 0x40; | |
81 | break; | |
82 | default: | |
83 | DEBUG_MSG("via_i2c: specify wrong i2c port.\n"); | |
84 | } | |
85 | viafb_write_reg(via_i2c_chan->i2c_port, VIASR, val); | |
86 | } | |
87 | ||
88 | int viafb_i2c_readbyte(u8 slave_addr, u8 index, u8 *pdata) | |
89 | { | |
90 | u8 mm1[] = {0x00}; | |
91 | struct i2c_msg msgs[2]; | |
92 | ||
93 | *pdata = 0; | |
94 | msgs[0].flags = 0; | |
95 | msgs[1].flags = I2C_M_RD; | |
96 | msgs[0].addr = msgs[1].addr = slave_addr / 2; | |
97 | mm1[0] = index; | |
98 | msgs[0].len = 1; msgs[1].len = 1; | |
99 | msgs[0].buf = mm1; msgs[1].buf = pdata; | |
100 | i2c_transfer(&viaparinfo->i2c_stuff.adapter, msgs, 2); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | int viafb_i2c_writebyte(u8 slave_addr, u8 index, u8 data) | |
106 | { | |
107 | u8 msg[2] = { index, data }; | |
108 | struct i2c_msg msgs; | |
109 | ||
110 | msgs.flags = 0; | |
111 | msgs.addr = slave_addr / 2; | |
112 | msgs.len = 2; | |
113 | msgs.buf = msg; | |
114 | return i2c_transfer(&viaparinfo->i2c_stuff.adapter, &msgs, 1); | |
115 | } | |
116 | ||
117 | int viafb_i2c_readbytes(u8 slave_addr, u8 index, u8 *buff, int buff_len) | |
118 | { | |
119 | u8 mm1[] = {0x00}; | |
120 | struct i2c_msg msgs[2]; | |
121 | ||
122 | msgs[0].flags = 0; | |
123 | msgs[1].flags = I2C_M_RD; | |
124 | msgs[0].addr = msgs[1].addr = slave_addr / 2; | |
125 | mm1[0] = index; | |
126 | msgs[0].len = 1; msgs[1].len = buff_len; | |
127 | msgs[0].buf = mm1; msgs[1].buf = buff; | |
128 | i2c_transfer(&viaparinfo->i2c_stuff.adapter, msgs, 2); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | int viafb_create_i2c_bus(void *viapar) | |
133 | { | |
134 | int ret; | |
135 | struct viafb_par *par = (struct viafb_par *)viapar; | |
136 | ||
137 | strcpy(par->i2c_stuff.adapter.name, "via_i2c"); | |
138 | par->i2c_stuff.i2c_port = 0x0; | |
139 | par->i2c_stuff.adapter.owner = THIS_MODULE; | |
140 | par->i2c_stuff.adapter.id = 0x01FFFF; | |
141 | par->i2c_stuff.adapter.class = 0; | |
142 | par->i2c_stuff.adapter.algo_data = &par->i2c_stuff.algo; | |
143 | par->i2c_stuff.adapter.dev.parent = NULL; | |
144 | par->i2c_stuff.algo.setsda = via_i2c_setsda; | |
145 | par->i2c_stuff.algo.setscl = via_i2c_setscl; | |
146 | par->i2c_stuff.algo.getsda = via_i2c_getsda; | |
147 | par->i2c_stuff.algo.getscl = via_i2c_getscl; | |
148 | par->i2c_stuff.algo.udelay = 40; | |
149 | par->i2c_stuff.algo.timeout = 20; | |
150 | par->i2c_stuff.algo.data = &par->i2c_stuff; | |
151 | ||
152 | i2c_set_adapdata(&par->i2c_stuff.adapter, &par->i2c_stuff); | |
153 | ||
154 | /* Raise SCL and SDA */ | |
155 | par->i2c_stuff.i2c_port = I2CPORTINDEX; | |
156 | via_i2c_setsda(&par->i2c_stuff, 1); | |
157 | via_i2c_setscl(&par->i2c_stuff, 1); | |
158 | ||
159 | par->i2c_stuff.i2c_port = GPIOPORTINDEX; | |
160 | via_i2c_setsda(&par->i2c_stuff, 1); | |
161 | via_i2c_setscl(&par->i2c_stuff, 1); | |
162 | udelay(20); | |
163 | ||
164 | ret = i2c_bit_add_bus(&par->i2c_stuff.adapter); | |
165 | if (ret == 0) | |
166 | DEBUG_MSG("I2C bus %s registered.\n", | |
167 | par->i2c_stuff.adapter.name); | |
168 | else | |
169 | DEBUG_MSG("Failed to register I2C bus %s.\n", | |
170 | par->i2c_stuff.adapter.name); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | void viafb_delete_i2c_buss(void *par) | |
175 | { | |
176 | i2c_del_adapter(&((struct viafb_par *)par)->i2c_stuff.adapter); | |
177 | } |