blob: 02a0ea6e1c17e030e7391ec09ec396a24d70eb96 [file] [log] [blame]
Johannes Stezenbach2add87a2005-05-16 21:54:10 -07001/*
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
Johannes Stezenbachbdc78002005-05-16 21:54:18 -070012static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100)
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070013{
Johannes Stezenbachbdc78002005-05-16 21:54:18 -070014 int i;
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070015 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");
Johannes Stezenbachbdc78002005-05-16 21:54:18 -070034 return -EREMOTEIO;
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070035 }
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
Johannes Stezenbachbdc78002005-05-16 21:54:18 -070047 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 }
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070059
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070060 buf[0] = r100.tw_sm_c_100.data1_reg;
61
Johannes Stezenbachbdc78002005-05-16 21:54:18 -070062 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 }
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070071
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);
Johannes Stezenbachbdc78002005-05-16 21:54:18 -070092 return flexcop_i2c_operation(fc,&r100);
Johannes Stezenbach2add87a2005-05-16 21:54:10 -070093}
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
Johannes Stezenbachbdc78002005-05-16 21:54:18 -0700132/* 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
Ingo Molnar3593cab2006-02-07 06:49:14 -0200138 if (mutex_lock_interruptible(&fc->i2c_mutex))
Johannes Stezenbachbdc78002005-05-16 21:54:18 -0700139 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
Ingo Molnar3593cab2006-02-07 06:49:14 -0200164 mutex_unlock(&fc->i2c_mutex);
Johannes Stezenbachbdc78002005-05-16 21:54:18 -0700165
166 return ret;
167}
168
Johannes Stezenbach2add87a2005-05-16 21:54:10 -0700169static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
170{
171 return I2C_FUNC_I2C;
172}
173
174static struct i2c_algorithm flexcop_algo = {
Johannes Stezenbach2add87a2005-05-16 21:54:10 -0700175 .master_xfer = flexcop_master_xfer,
176 .functionality = flexcop_i2c_func,
177};
178
179int flexcop_i2c_init(struct flexcop_device *fc)
180{
181 int ret;
182
Ingo Molnar3593cab2006-02-07 06:49:14 -0200183 mutex_init(&fc->i2c_mutex);
Johannes Stezenbach2add87a2005-05-16 21:54:10 -0700184
185 memset(&fc->i2c_adap, 0, sizeof(struct i2c_adapter));
David Brownell2096b952007-05-01 23:26:28 +0200186 strncpy(fc->i2c_adap.name, "B2C2 FlexCop device",
187 sizeof(fc->i2c_adap.name));
Johannes Stezenbach2add87a2005-05-16 21:54:10 -0700188
189 i2c_set_adapdata(&fc->i2c_adap,fc);
190
191 fc->i2c_adap.class = I2C_CLASS_TV_DIGITAL;
192 fc->i2c_adap.algo = &flexcop_algo;
193 fc->i2c_adap.algo_data = NULL;
Jean Delvare12a917f2007-02-13 22:09:03 +0100194 fc->i2c_adap.dev.parent = fc->dev;
Johannes Stezenbach2add87a2005-05-16 21:54:10 -0700195
196 if ((ret = i2c_add_adapter(&fc->i2c_adap)) < 0)
197 return ret;
198
199 fc->init_state |= FC_STATE_I2C_INIT;
200 return 0;
201}
202
203void flexcop_i2c_exit(struct flexcop_device *fc)
204{
205 if (fc->init_state & FC_STATE_I2C_INIT)
206 i2c_del_adapter(&fc->i2c_adap);
207
208 fc->init_state &= ~FC_STATE_I2C_INIT;
209}