Commit | Line | Data |
---|---|---|
2add87a9 JS |
1 | /* |
2 | * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III | |
3 | * | |
4 | * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization | |
5 | * | |
6 | * see flexcop.c for copyright information. | |
7 | */ | |
8 | #include "flexcop.h" | |
9 | ||
10 | #define FC_MAX_I2C_RETRIES 100000 | |
11 | ||
bdc78001 | 12 | static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100) |
2add87a9 | 13 | { |
bdc78001 | 14 | int i; |
2add87a9 JS |
15 | flexcop_ibi_value r; |
16 | ||
17 | r100->tw_sm_c_100.working_start = 1; | |
18 | deb_i2c("r100 before: %08x\n",r100->raw); | |
19 | ||
20 | fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero); | |
21 | fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */ | |
22 | ||
23 | for (i = 0; i < FC_MAX_I2C_RETRIES; i++) { | |
24 | r = fc->read_ibi_reg(fc, tw_sm_c_100); | |
25 | ||
26 | if (!r.tw_sm_c_100.no_base_addr_ack_error) { | |
27 | if (r.tw_sm_c_100.st_done) { /* && !r.tw_sm_c_100.working_start */ | |
28 | *r100 = r; | |
29 | deb_i2c("i2c success\n"); | |
30 | return 0; | |
31 | } | |
32 | } else { | |
33 | deb_i2c("suffering from an i2c ack_error\n"); | |
bdc78001 | 34 | return -EREMOTEIO; |
2add87a9 JS |
35 | } |
36 | } | |
37 | deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n",i); | |
38 | return -EREMOTEIO; | |
39 | } | |
40 | ||
41 | static int flexcop_i2c_read4(struct flexcop_device *fc, flexcop_ibi_value r100, u8 *buf) | |
42 | { | |
43 | flexcop_ibi_value r104; | |
44 | int len = r100.tw_sm_c_100.total_bytes, /* remember total_bytes is buflen-1 */ | |
45 | ret; | |
46 | ||
bdc78001 JS |
47 | if ((ret = flexcop_i2c_operation(fc,&r100)) != 0) { |
48 | /* The Cablestar needs a different kind of i2c-transfer (does not | |
49 | * support "Repeat Start"): | |
50 | * wait for the ACK failure, | |
51 | * and do a subsequent read with the Bit 30 enabled | |
52 | */ | |
53 | r100.tw_sm_c_100.no_base_addr_ack_error = 1; | |
54 | if ((ret = flexcop_i2c_operation(fc,&r100)) != 0) { | |
55 | deb_i2c("no_base_addr read failed. %d\n",ret); | |
56 | return ret; | |
57 | } | |
58 | } | |
2add87a9 | 59 | |
2add87a9 JS |
60 | buf[0] = r100.tw_sm_c_100.data1_reg; |
61 | ||
bdc78001 JS |
62 | if (len > 0) { |
63 | r104 = fc->read_ibi_reg(fc,tw_sm_c_104); | |
64 | deb_i2c("read: r100: %08x, r104: %08x\n",r100.raw,r104.raw); | |
65 | ||
66 | /* there is at least one more byte, otherwise we wouldn't be here */ | |
67 | buf[1] = r104.tw_sm_c_104.data2_reg; | |
68 | if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg; | |
69 | if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg; | |
70 | } | |
2add87a9 JS |
71 | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int flexcop_i2c_write4(struct flexcop_device *fc, flexcop_ibi_value r100, u8 *buf) | |
76 | { | |
77 | flexcop_ibi_value r104; | |
78 | int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */ | |
79 | r104.raw = 0; | |
80 | ||
81 | /* there is at least one byte, otherwise we wouldn't be here */ | |
82 | r100.tw_sm_c_100.data1_reg = buf[0]; | |
83 | ||
84 | r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0; | |
85 | r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0; | |
86 | r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0; | |
87 | ||
88 | deb_i2c("write: r100: %08x, r104: %08x\n",r100.raw,r104.raw); | |
89 | ||
90 | /* write the additional i2c data before doing the actual i2c operation */ | |
91 | fc->write_ibi_reg(fc,tw_sm_c_104,r104); | |
bdc78001 JS |
92 | return flexcop_i2c_operation(fc,&r100); |
93 | } | |
94 | ||
95 | int flexcop_i2c_request(struct flexcop_device *fc, flexcop_access_op_t op, | |
96 | flexcop_i2c_port_t port, u8 chipaddr, u8 addr, u8 *buf, u16 len) | |
97 | { | |
98 | int ret; | |
99 | u16 bytes_to_transfer; | |
100 | flexcop_ibi_value r100; | |
101 | ||
102 | deb_i2c("op = %d\n",op); | |
103 | r100.raw = 0; | |
104 | r100.tw_sm_c_100.chipaddr = chipaddr; | |
105 | r100.tw_sm_c_100.twoWS_rw = op; | |
106 | r100.tw_sm_c_100.twoWS_port_reg = port; | |
107 | ||
108 | while (len != 0) { | |
109 | bytes_to_transfer = len > 4 ? 4 : len; | |
2add87a9 | 110 | |
bdc78001 JS |
111 | r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1; |
112 | r100.tw_sm_c_100.baseaddr = addr; | |
113 | ||
114 | if (op == FC_READ) | |
115 | ret = flexcop_i2c_read4(fc, r100, buf); | |
116 | else | |
117 | ret = flexcop_i2c_write4(fc,r100, buf); | |
118 | ||
119 | if (ret < 0) | |
120 | return ret; | |
121 | ||
122 | buf += bytes_to_transfer; | |
123 | addr += bytes_to_transfer; | |
124 | len -= bytes_to_transfer; | |
125 | }; | |
126 | ||
127 | return 0; | |
2add87a9 | 128 | } |
bdc78001 JS |
129 | /* exported for PCI i2c */ |
130 | EXPORT_SYMBOL(flexcop_i2c_request); | |
2add87a9 JS |
131 | |
132 | /* master xfer callback for demodulator */ | |
133 | static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) | |
134 | { | |
135 | struct flexcop_device *fc = i2c_get_adapdata(i2c_adap); | |
136 | int i, ret = 0; | |
137 | ||
6175e487 TP |
138 | /* Some drivers use 1 byte or 0 byte reads as probes, which this |
139 | * driver doesn't support. These probes will always fail, so this | |
140 | * hack makes them always succeed. If one knew how, it would of | |
141 | * course be better to actually do the read. */ | |
142 | if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1) | |
143 | return 1; | |
144 | ||
3593cab5 | 145 | if (mutex_lock_interruptible(&fc->i2c_mutex)) |
2add87a9 JS |
146 | return -ERESTARTSYS; |
147 | ||
148 | /* reading */ | |
149 | if (num == 2 && | |
150 | msgs[0].flags == 0 && | |
151 | msgs[1].flags == I2C_M_RD && | |
152 | msgs[0].buf != NULL && | |
153 | msgs[1].buf != NULL) { | |
154 | ||
155 | ret = fc->i2c_request(fc, FC_READ, FC_I2C_PORT_DEMOD, msgs[0].addr, msgs[0].buf[0], msgs[1].buf, msgs[1].len); | |
156 | ||
157 | } else for (i = 0; i < num; i++) { /* writing command */ | |
158 | if (msgs[i].flags != 0 || msgs[i].buf == NULL || msgs[i].len < 2) { | |
159 | ret = -EINVAL; | |
160 | break; | |
161 | } | |
162 | ||
163 | ret = fc->i2c_request(fc, FC_WRITE, FC_I2C_PORT_DEMOD, msgs[i].addr, msgs[i].buf[0], &msgs[i].buf[1], msgs[i].len - 1); | |
164 | } | |
165 | ||
166 | if (ret < 0) | |
167 | err("i2c master_xfer failed"); | |
168 | else | |
169 | ret = num; | |
170 | ||
3593cab5 | 171 | mutex_unlock(&fc->i2c_mutex); |
2add87a9 JS |
172 | |
173 | return ret; | |
174 | } | |
175 | ||
2add87a9 JS |
176 | static u32 flexcop_i2c_func(struct i2c_adapter *adapter) |
177 | { | |
178 | return I2C_FUNC_I2C; | |
179 | } | |
180 | ||
181 | static struct i2c_algorithm flexcop_algo = { | |
2add87a9 JS |
182 | .master_xfer = flexcop_master_xfer, |
183 | .functionality = flexcop_i2c_func, | |
184 | }; | |
185 | ||
186 | int flexcop_i2c_init(struct flexcop_device *fc) | |
187 | { | |
188 | int ret; | |
189 | ||
3593cab5 | 190 | mutex_init(&fc->i2c_mutex); |
2add87a9 JS |
191 | |
192 | memset(&fc->i2c_adap, 0, sizeof(struct i2c_adapter)); | |
2096b956 DB |
193 | strncpy(fc->i2c_adap.name, "B2C2 FlexCop device", |
194 | sizeof(fc->i2c_adap.name)); | |
2add87a9 JS |
195 | |
196 | i2c_set_adapdata(&fc->i2c_adap,fc); | |
197 | ||
198 | fc->i2c_adap.class = I2C_CLASS_TV_DIGITAL; | |
199 | fc->i2c_adap.algo = &flexcop_algo; | |
200 | fc->i2c_adap.algo_data = NULL; | |
12a917f6 | 201 | fc->i2c_adap.dev.parent = fc->dev; |
2add87a9 JS |
202 | |
203 | if ((ret = i2c_add_adapter(&fc->i2c_adap)) < 0) | |
204 | return ret; | |
205 | ||
206 | fc->init_state |= FC_STATE_I2C_INIT; | |
207 | return 0; | |
208 | } | |
209 | ||
210 | void flexcop_i2c_exit(struct flexcop_device *fc) | |
211 | { | |
212 | if (fc->init_state & FC_STATE_I2C_INIT) | |
213 | i2c_del_adapter(&fc->i2c_adap); | |
214 | ||
215 | fc->init_state &= ~FC_STATE_I2C_INIT; | |
216 | } |