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Diffstat (limited to 'drivers/media/dvb/b2c2/flexcop-i2c.c')
-rw-r--r--drivers/media/dvb/b2c2/flexcop-i2c.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/media/dvb/b2c2/flexcop-i2c.c b/drivers/media/dvb/b2c2/flexcop-i2c.c
new file mode 100644
index 00000000000..be4266d4ae9
--- /dev/null
+++ b/drivers/media/dvb/b2c2/flexcop-i2c.c
@@ -0,0 +1,210 @@
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
12static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100)
13{
14 int i;
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");
34 return -EREMOTEIO;
35 }
36 }
37 deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n",i);
38 return -EREMOTEIO;
39}
40
41static 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
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 }
59
60 buf[0] = r100.tw_sm_c_100.data1_reg;
61
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 }
71
72 return 0;
73}
74
75static 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);
92 return flexcop_i2c_operation(fc,&r100);
93}
94
95int 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;
110
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;
128}
129/* exported for PCI i2c */
130EXPORT_SYMBOL(flexcop_i2c_request);
131
132/* master xfer callback for demodulator */
133static 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
138 if (down_interruptible(&fc->i2c_sem))
139 return -ERESTARTSYS;
140
141 /* reading */
142 if (num == 2 &&
143 msgs[0].flags == 0 &&
144 msgs[1].flags == I2C_M_RD &&
145 msgs[0].buf != NULL &&
146 msgs[1].buf != NULL) {
147
148 ret = fc->i2c_request(fc, FC_READ, FC_I2C_PORT_DEMOD, msgs[0].addr, msgs[0].buf[0], msgs[1].buf, msgs[1].len);
149
150 } else for (i = 0; i < num; i++) { /* writing command */
151 if (msgs[i].flags != 0 || msgs[i].buf == NULL || msgs[i].len < 2) {
152 ret = -EINVAL;
153 break;
154 }
155
156 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);
157 }
158
159 if (ret < 0)
160 err("i2c master_xfer failed");
161 else
162 ret = num;
163
164 up(&fc->i2c_sem);
165
166 return ret;
167}
168
169static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
170{
171 return I2C_FUNC_I2C;
172}
173
174static struct i2c_algorithm flexcop_algo = {
175 .name = "FlexCop I2C algorithm",
176 .id = I2C_ALGO_BIT,
177 .master_xfer = flexcop_master_xfer,
178 .functionality = flexcop_i2c_func,
179};
180
181int flexcop_i2c_init(struct flexcop_device *fc)
182{
183 int ret;
184
185 sema_init(&fc->i2c_sem,1);
186
187 memset(&fc->i2c_adap, 0, sizeof(struct i2c_adapter));
188 strncpy(fc->i2c_adap.name, "B2C2 FlexCop device",I2C_NAME_SIZE);
189
190 i2c_set_adapdata(&fc->i2c_adap,fc);
191
192 fc->i2c_adap.class = I2C_CLASS_TV_DIGITAL;
193 fc->i2c_adap.algo = &flexcop_algo;
194 fc->i2c_adap.algo_data = NULL;
195 fc->i2c_adap.id = I2C_ALGO_BIT;
196
197 if ((ret = i2c_add_adapter(&fc->i2c_adap)) < 0)
198 return ret;
199
200 fc->init_state |= FC_STATE_I2C_INIT;
201 return 0;
202}
203
204void flexcop_i2c_exit(struct flexcop_device *fc)
205{
206 if (fc->init_state & FC_STATE_I2C_INIT)
207 i2c_del_adapter(&fc->i2c_adap);
208
209 fc->init_state &= ~FC_STATE_I2C_INIT;
210}