1 /*
2 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
3 * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization
4 * see flexcop.c for copyright information
5 */
6 #include "flexcop.h"
7
8 #define FC_MAX_I2C_RETRIES 100000
9
flexcop_i2c_operation(struct flexcop_device * fc,flexcop_ibi_value * r100)10 static int flexcop_i2c_operation(struct flexcop_device *fc,
11 flexcop_ibi_value *r100)
12 {
13 int i;
14 flexcop_ibi_value r;
15
16 r100->tw_sm_c_100.working_start = 1;
17 deb_i2c("r100 before: %08x\n",r100->raw);
18
19 fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero);
20 fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */
21
22 for (i = 0; i < FC_MAX_I2C_RETRIES; i++) {
23 r = fc->read_ibi_reg(fc, tw_sm_c_100);
24
25 if (!r.tw_sm_c_100.no_base_addr_ack_error) {
26 if (r.tw_sm_c_100.st_done) {
27 *r100 = r;
28 deb_i2c("i2c success\n");
29 return 0;
30 }
31 } else {
32 deb_i2c("suffering from an i2c ack_error\n");
33 return -EREMOTEIO;
34 }
35 }
36 deb_i2c("tried %d times i2c operation, "
37 "never finished or too many ack errors.\n", i);
38 return -EREMOTEIO;
39 }
40
flexcop_i2c_read4(struct flexcop_i2c_adapter * i2c,flexcop_ibi_value r100,u8 * buf)41 static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c,
42 flexcop_ibi_value r100, u8 *buf)
43 {
44 flexcop_ibi_value r104;
45 int len = r100.tw_sm_c_100.total_bytes,
46 /* remember total_bytes is buflen-1 */
47 ret;
48
49 /* work-around to have CableStar2 and SkyStar2 rev 2.7 work
50 * correctly:
51 *
52 * the ITD1000 is behind an i2c-gate which closes automatically
53 * after an i2c-transaction the STV0297 needs 2 consecutive reads
54 * one with no_base_addr = 0 and one with 1
55 *
56 * those two work-arounds are conflictin: we check for the card
57 * type, it is set when probing the ITD1000 */
58 if (i2c->fc->dev_type == FC_SKY_REV27)
59 r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr;
60
61 ret = flexcop_i2c_operation(i2c->fc, &r100);
62 if (ret != 0) {
63 deb_i2c("Retrying operation\n");
64 r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr;
65 ret = flexcop_i2c_operation(i2c->fc, &r100);
66 }
67 if (ret != 0) {
68 deb_i2c("read failed. %d\n", ret);
69 return ret;
70 }
71
72 buf[0] = r100.tw_sm_c_100.data1_reg;
73
74 if (len > 0) {
75 r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104);
76 deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
77
78 /* there is at least one more byte, otherwise we wouldn't be here */
79 buf[1] = r104.tw_sm_c_104.data2_reg;
80 if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg;
81 if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg;
82 }
83 return 0;
84 }
85
flexcop_i2c_write4(struct flexcop_device * fc,flexcop_ibi_value r100,u8 * buf)86 static int flexcop_i2c_write4(struct flexcop_device *fc,
87 flexcop_ibi_value r100, u8 *buf)
88 {
89 flexcop_ibi_value r104;
90 int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */
91 r104.raw = 0;
92
93 /* there is at least one byte, otherwise we wouldn't be here */
94 r100.tw_sm_c_100.data1_reg = buf[0];
95 r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0;
96 r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0;
97 r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0;
98
99 deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
100
101 /* write the additional i2c data before doing the actual i2c operation */
102 fc->write_ibi_reg(fc, tw_sm_c_104, r104);
103 return flexcop_i2c_operation(fc, &r100);
104 }
105
flexcop_i2c_request(struct flexcop_i2c_adapter * i2c,flexcop_access_op_t op,u8 chipaddr,u8 addr,u8 * buf,u16 len)106 int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c,
107 flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len)
108 {
109 int ret;
110
111 #ifdef DUMP_I2C_MESSAGES
112 int i;
113 #endif
114
115 u16 bytes_to_transfer;
116 flexcop_ibi_value r100;
117
118 deb_i2c("op = %d\n",op);
119 r100.raw = 0;
120 r100.tw_sm_c_100.chipaddr = chipaddr;
121 r100.tw_sm_c_100.twoWS_rw = op;
122 r100.tw_sm_c_100.twoWS_port_reg = i2c->port;
123
124 #ifdef DUMP_I2C_MESSAGES
125 printk(KERN_DEBUG "%d ", i2c->port);
126 if (op == FC_READ)
127 printk("rd(");
128 else
129 printk("wr(");
130 printk("%02x): %02x ", chipaddr, addr);
131 #endif
132
133 /* in that case addr is the only value ->
134 * we write it twice as baseaddr and val0
135 * BBTI is doing it like that for ISL6421 at least */
136 if (i2c->no_base_addr && len == 0 && op == FC_WRITE) {
137 buf = &addr;
138 len = 1;
139 }
140
141 while (len != 0) {
142 bytes_to_transfer = len > 4 ? 4 : len;
143
144 r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1;
145 r100.tw_sm_c_100.baseaddr = addr;
146
147 if (op == FC_READ)
148 ret = flexcop_i2c_read4(i2c, r100, buf);
149 else
150 ret = flexcop_i2c_write4(i2c->fc, r100, buf);
151
152 #ifdef DUMP_I2C_MESSAGES
153 for (i = 0; i < bytes_to_transfer; i++)
154 printk("%02x ", buf[i]);
155 #endif
156
157 if (ret < 0)
158 return ret;
159
160 buf += bytes_to_transfer;
161 addr += bytes_to_transfer;
162 len -= bytes_to_transfer;
163 }
164
165 #ifdef DUMP_I2C_MESSAGES
166 printk("\n");
167 #endif
168
169 return 0;
170 }
171 /* exported for PCI i2c */
172 EXPORT_SYMBOL(flexcop_i2c_request);
173
174 /* master xfer callback for demodulator */
flexcop_master_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg msgs[],int num)175 static int flexcop_master_xfer(struct i2c_adapter *i2c_adap,
176 struct i2c_msg msgs[], int num)
177 {
178 struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap);
179 int i, ret = 0;
180
181 /* Some drivers use 1 byte or 0 byte reads as probes, which this
182 * driver doesn't support. These probes will always fail, so this
183 * hack makes them always succeed. If one knew how, it would of
184 * course be better to actually do the read. */
185 if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1)
186 return 1;
187
188 if (mutex_lock_interruptible(&i2c->fc->i2c_mutex))
189 return -ERESTARTSYS;
190
191 for (i = 0; i < num; i++) {
192 /* reading */
193 if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) {
194 ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr,
195 msgs[i].buf[0], msgs[i+1].buf,
196 msgs[i+1].len);
197 i++; /* skip the following message */
198 } else /* writing */
199 ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr,
200 msgs[i].buf[0], &msgs[i].buf[1],
201 msgs[i].len - 1);
202 if (ret < 0) {
203 deb_i2c("i2c master_xfer failed");
204 break;
205 }
206 }
207
208 mutex_unlock(&i2c->fc->i2c_mutex);
209
210 if (ret == 0)
211 ret = num;
212 return ret;
213 }
214
flexcop_i2c_func(struct i2c_adapter * adapter)215 static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
216 {
217 return I2C_FUNC_I2C;
218 }
219
220 static struct i2c_algorithm flexcop_algo = {
221 .master_xfer = flexcop_master_xfer,
222 .functionality = flexcop_i2c_func,
223 };
224
flexcop_i2c_init(struct flexcop_device * fc)225 int flexcop_i2c_init(struct flexcop_device *fc)
226 {
227 int ret;
228 mutex_init(&fc->i2c_mutex);
229
230 fc->fc_i2c_adap[0].fc = fc;
231 fc->fc_i2c_adap[1].fc = fc;
232 fc->fc_i2c_adap[2].fc = fc;
233 fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD;
234 fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM;
235 fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER;
236
237 strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod",
238 sizeof(fc->fc_i2c_adap[0].i2c_adap.name));
239 strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom",
240 sizeof(fc->fc_i2c_adap[1].i2c_adap.name));
241 strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner",
242 sizeof(fc->fc_i2c_adap[2].i2c_adap.name));
243
244 i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]);
245 i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]);
246 i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]);
247
248 fc->fc_i2c_adap[0].i2c_adap.algo =
249 fc->fc_i2c_adap[1].i2c_adap.algo =
250 fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo;
251 fc->fc_i2c_adap[0].i2c_adap.algo_data =
252 fc->fc_i2c_adap[1].i2c_adap.algo_data =
253 fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL;
254 fc->fc_i2c_adap[0].i2c_adap.dev.parent =
255 fc->fc_i2c_adap[1].i2c_adap.dev.parent =
256 fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev;
257
258 ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap);
259 if (ret < 0)
260 return ret;
261
262 ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap);
263 if (ret < 0)
264 goto adap_1_failed;
265
266 ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap);
267 if (ret < 0)
268 goto adap_2_failed;
269
270 fc->init_state |= FC_STATE_I2C_INIT;
271 return 0;
272
273 adap_2_failed:
274 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
275 adap_1_failed:
276 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
277 return ret;
278 }
279
flexcop_i2c_exit(struct flexcop_device * fc)280 void flexcop_i2c_exit(struct flexcop_device *fc)
281 {
282 if (fc->init_state & FC_STATE_I2C_INIT) {
283 i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap);
284 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
285 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
286 }
287 fc->init_state &= ~FC_STATE_I2C_INIT;
288 }
289