2 * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
4 * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization
6 * see flexcop.c for copyright information.
10 #define FC_MAX_I2C_RETRIES 100000
12 /* #define DUMP_I2C_MESSAGES */
14 static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100)
19 r100->tw_sm_c_100.working_start = 1;
20 deb_i2c("r100 before: %08x\n",r100->raw);
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 */
25 for (i = 0; i < FC_MAX_I2C_RETRIES; i++) {
26 r = fc->read_ibi_reg(fc, tw_sm_c_100);
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 */
31 deb_i2c("i2c success\n");
35 deb_i2c("suffering from an i2c ack_error\n");
39 deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n",i);
43 static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c,
44 flexcop_ibi_value r100, u8 *buf)
46 flexcop_ibi_value r104;
47 int len = r100.tw_sm_c_100.total_bytes, /* remember total_bytes is buflen-1 */
50 ret = flexcop_i2c_operation(i2c->fc, &r100);
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);
57 deb_i2c("read failed. %d\n", ret);
61 buf[0] = r100.tw_sm_c_100.data1_reg;
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);
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;
76 static int flexcop_i2c_write4(struct flexcop_device *fc, flexcop_ibi_value r100, u8 *buf)
78 flexcop_ibi_value r104;
79 int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */
82 /* there is at least one byte, otherwise we wouldn't be here */
83 r100.tw_sm_c_100.data1_reg = buf[0];
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;
89 deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
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);
96 int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c,
97 flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len)
101 #ifdef DUMP_I2C_MESSAGES
105 u16 bytes_to_transfer;
106 flexcop_ibi_value r100;
108 deb_i2c("op = %d\n",op);
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;
114 #ifdef DUMP_I2C_MESSAGES
115 printk(KERN_DEBUG "%d ", i2c->port);
121 printk("%02x): %02x ", chipaddr, addr);
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) {
133 bytes_to_transfer = len > 4 ? 4 : len;
135 r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1;
136 r100.tw_sm_c_100.baseaddr = addr;
139 ret = flexcop_i2c_read4(i2c, r100, buf);
141 ret = flexcop_i2c_write4(i2c->fc, r100, buf);
143 #ifdef DUMP_I2C_MESSAGES
144 for (i = 0; i < bytes_to_transfer; i++)
145 printk("%02x ", buf[i]);
151 buf += bytes_to_transfer;
152 addr += bytes_to_transfer;
153 len -= bytes_to_transfer;
156 #ifdef DUMP_I2C_MESSAGES
162 /* exported for PCI i2c */
163 EXPORT_SYMBOL(flexcop_i2c_request);
165 /* master xfer callback for demodulator */
166 static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
168 struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap);
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)
178 if (mutex_lock_interruptible(&i2c->fc->i2c_mutex))
181 for (i = 0; i < num; i++) {
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 */
188 ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr,
189 msgs[i].buf[0], &msgs[i].buf[1],
192 err("i2c master_xfer failed");
197 mutex_unlock(&i2c->fc->i2c_mutex);
204 static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
209 static struct i2c_algorithm flexcop_algo = {
210 .master_xfer = flexcop_master_xfer,
211 .functionality = flexcop_i2c_func,
214 int flexcop_i2c_init(struct flexcop_device *fc)
218 mutex_init(&fc->i2c_mutex);
220 fc->fc_i2c_adap[0].fc = fc;
221 fc->fc_i2c_adap[1].fc = fc;
222 fc->fc_i2c_adap[2].fc = fc;
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;
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));
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]);
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;
252 ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap);
256 ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap);
260 ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap);
264 fc->init_state |= FC_STATE_I2C_INIT;
268 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
270 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
275 void flexcop_i2c_exit(struct flexcop_device *fc)
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);
283 fc->init_state &= ~FC_STATE_I2C_INIT;