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
12 /* #define DUMP_I2C_MESSAGES */
13
flexcop_i2c_operation(struct flexcop_device * fc,flexcop_ibi_value * r100)14 static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100)
15 {
16 int i;
17 flexcop_ibi_value r;
18
19 r100->tw_sm_c_100.working_start = 1;
20 deb_i2c("r100 before: %08x\n",r100->raw);
21
22 fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero);
23 fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */
24
25 for (i = 0; i < FC_MAX_I2C_RETRIES; i++) {
26 r = fc->read_ibi_reg(fc, tw_sm_c_100);
27
28 if (!r.tw_sm_c_100.no_base_addr_ack_error) {
29 if (r.tw_sm_c_100.st_done) { /* && !r.tw_sm_c_100.working_start */
30 *r100 = r;
31 deb_i2c("i2c success\n");
32 return 0;
33 }
34 } else {
35 deb_i2c("suffering from an i2c ack_error\n");
36 return -EREMOTEIO;
37 }
38 }
39 deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n",i);
40 return -EREMOTEIO;
41 }
42
flexcop_i2c_read4(struct flexcop_i2c_adapter * i2c,flexcop_ibi_value r100,u8 * buf)43 static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c,
44 flexcop_ibi_value r100, u8 *buf)
45 {
46 flexcop_ibi_value r104;
47 int len = r100.tw_sm_c_100.total_bytes, /* remember total_bytes is buflen-1 */
48 ret;
49
50 ret = flexcop_i2c_operation(i2c->fc, &r100);
51 if (ret != 0) {
52 deb_i2c("Retrying operation\n");
53 r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr;
54 ret = flexcop_i2c_operation(i2c->fc, &r100);
55 }
56 if (ret != 0) {
57 deb_i2c("read failed. %d\n", ret);
58 return ret;
59 }
60
61 buf[0] = r100.tw_sm_c_100.data1_reg;
62
63 if (len > 0) {
64 r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104);
65 deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
66
67 /* there is at least one more byte, otherwise we wouldn't be here */
68 buf[1] = r104.tw_sm_c_104.data2_reg;
69 if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg;
70 if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg;
71 }
72
73 return 0;
74 }
75
flexcop_i2c_write4(struct flexcop_device * fc,flexcop_ibi_value r100,u8 * buf)76 static int flexcop_i2c_write4(struct flexcop_device *fc, flexcop_ibi_value r100, u8 *buf)
77 {
78 flexcop_ibi_value r104;
79 int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */
80 r104.raw = 0;
81
82 /* there is at least one byte, otherwise we wouldn't be here */
83 r100.tw_sm_c_100.data1_reg = buf[0];
84
85 r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0;
86 r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0;
87 r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0;
88
89 deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
90
91 /* write the additional i2c data before doing the actual i2c operation */
92 fc->write_ibi_reg(fc, tw_sm_c_104, r104);
93 return flexcop_i2c_operation(fc, &r100);
94 }
95
flexcop_i2c_request(struct flexcop_i2c_adapter * i2c,flexcop_access_op_t op,u8 chipaddr,u8 addr,u8 * buf,u16 len)96 int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c,
97 flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len)
98 {
99 int ret;
100
101 #ifdef DUMP_I2C_MESSAGES
102 int i;
103 #endif
104
105 u16 bytes_to_transfer;
106 flexcop_ibi_value r100;
107
108 deb_i2c("op = %d\n",op);
109 r100.raw = 0;
110 r100.tw_sm_c_100.chipaddr = chipaddr;
111 r100.tw_sm_c_100.twoWS_rw = op;
112 r100.tw_sm_c_100.twoWS_port_reg = i2c->port;
113
114 #ifdef DUMP_I2C_MESSAGES
115 printk(KERN_DEBUG "%d ", i2c->port);
116 if (op == FC_READ)
117 printk("rd(");
118 else
119 printk("wr(");
120
121 printk("%02x): %02x ", chipaddr, addr);
122 #endif
123
124 /* in that case addr is the only value ->
125 * we write it twice as baseaddr and val0
126 * BBTI is doing it like that for ISL6421 at least */
127 if (i2c->no_base_addr && len == 0 && op == FC_WRITE) {
128 buf = &addr;
129 len = 1;
130 }
131
132 while (len != 0) {
133 bytes_to_transfer = len > 4 ? 4 : len;
134
135 r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1;
136 r100.tw_sm_c_100.baseaddr = addr;
137
138 if (op == FC_READ)
139 ret = flexcop_i2c_read4(i2c, r100, buf);
140 else
141 ret = flexcop_i2c_write4(i2c->fc, r100, buf);
142
143 #ifdef DUMP_I2C_MESSAGES
144 for (i = 0; i < bytes_to_transfer; i++)
145 printk("%02x ", buf[i]);
146 #endif
147
148 if (ret < 0)
149 return ret;
150
151 buf += bytes_to_transfer;
152 addr += bytes_to_transfer;
153 len -= bytes_to_transfer;
154 }
155
156 #ifdef DUMP_I2C_MESSAGES
157 printk("\n");
158 #endif
159
160 return 0;
161 }
162 /* exported for PCI i2c */
163 EXPORT_SYMBOL(flexcop_i2c_request);
164
165 /* master xfer callback for demodulator */
flexcop_master_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg msgs[],int num)166 static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
167 {
168 struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap);
169 int i, ret = 0;
170
171 /* Some drivers use 1 byte or 0 byte reads as probes, which this
172 * driver doesn't support. These probes will always fail, so this
173 * hack makes them always succeed. If one knew how, it would of
174 * course be better to actually do the read. */
175 if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1)
176 return 1;
177
178 if (mutex_lock_interruptible(&i2c->fc->i2c_mutex))
179 return -ERESTARTSYS;
180
181 for (i = 0; i < num; i++) {
182 /* reading */
183 if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) {
184 ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr,
185 msgs[i].buf[0], msgs[i+1].buf, msgs[i+1].len);
186 i++; /* skip the following message */
187 } else /* writing */
188 ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr,
189 msgs[i].buf[0], &msgs[i].buf[1],
190 msgs[i].len - 1);
191 if (ret < 0) {
192 err("i2c master_xfer failed");
193 break;
194 }
195 }
196
197 mutex_unlock(&i2c->fc->i2c_mutex);
198
199 if (ret == 0)
200 ret = num;
201 return ret;
202 }
203
flexcop_i2c_func(struct i2c_adapter * adapter)204 static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
205 {
206 return I2C_FUNC_I2C;
207 }
208
209 static struct i2c_algorithm flexcop_algo = {
210 .master_xfer = flexcop_master_xfer,
211 .functionality = flexcop_i2c_func,
212 };
213
flexcop_i2c_init(struct flexcop_device * fc)214 int flexcop_i2c_init(struct flexcop_device *fc)
215 {
216 int ret;
217
218 mutex_init(&fc->i2c_mutex);
219
220 fc->fc_i2c_adap[0].fc = fc;
221 fc->fc_i2c_adap[1].fc = fc;
222 fc->fc_i2c_adap[2].fc = fc;
223
224 fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD;
225 fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM;
226 fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER;
227
228 strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod",
229 sizeof(fc->fc_i2c_adap[0].i2c_adap.name));
230 strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom",
231 sizeof(fc->fc_i2c_adap[1].i2c_adap.name));
232 strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner",
233 sizeof(fc->fc_i2c_adap[2].i2c_adap.name));
234
235 i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]);
236 i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]);
237 i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]);
238
239 fc->fc_i2c_adap[0].i2c_adap.class =
240 fc->fc_i2c_adap[1].i2c_adap.class =
241 fc->fc_i2c_adap[2].i2c_adap.class = I2C_CLASS_TV_DIGITAL;
242 fc->fc_i2c_adap[0].i2c_adap.algo =
243 fc->fc_i2c_adap[1].i2c_adap.algo =
244 fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo;
245 fc->fc_i2c_adap[0].i2c_adap.algo_data =
246 fc->fc_i2c_adap[1].i2c_adap.algo_data =
247 fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL;
248 fc->fc_i2c_adap[0].i2c_adap.dev.parent =
249 fc->fc_i2c_adap[1].i2c_adap.dev.parent =
250 fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev;
251
252 ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap);
253 if (ret < 0)
254 return ret;
255
256 ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap);
257 if (ret < 0)
258 goto adap_1_failed;
259
260 ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap);
261 if (ret < 0)
262 goto adap_2_failed;
263
264 fc->init_state |= FC_STATE_I2C_INIT;
265 return 0;
266
267 adap_2_failed:
268 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
269 adap_1_failed:
270 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
271
272 return ret;
273 }
274
flexcop_i2c_exit(struct flexcop_device * fc)275 void flexcop_i2c_exit(struct flexcop_device *fc)
276 {
277 if (fc->init_state & FC_STATE_I2C_INIT) {
278 i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap);
279 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
280 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
281 }
282
283 fc->init_state &= ~FC_STATE_I2C_INIT;
284 }
285