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14#include <linux/module.h>
15#include <linux/delay.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/unistd.h>
19#include <linux/time.h>
20#include <linux/device.h>
21#include <linux/i2c.h>
22#include <linux/mutex.h>
23#include <linux/uaccess.h>
24
25#include "go7007-priv.h"
26
27
28
29
30
31#define SPI_I2C_ADDR_BASE 0x1400
32#define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2)
33#define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6)
34#define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7)
35#define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8)
36#define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9)
37#define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa)
38
39#define I2C_STATE_MASK 0x0007
40#define I2C_READ_READY_MASK 0x0008
41
42
43
44static DEFINE_MUTEX(adlink_mpg24_i2c_lock);
45
46static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
47 u16 command, int flags, u8 *data)
48{
49 int i, ret = -EIO;
50 u16 val;
51
52 if (go->status == STATUS_SHUTDOWN)
53 return -ENODEV;
54
55#ifdef GO7007_I2C_DEBUG
56 if (read)
57 dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",
58 command, addr);
59 else
60 dev_dbg(go->dev,
61 "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
62 *data, command, addr);
63#endif
64
65 mutex_lock(&go->hw_lock);
66
67 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
68
69 mutex_lock(&adlink_mpg24_i2c_lock);
70 go7007_write_addr(go, 0x3c82, 0x0020);
71 }
72
73
74 for (i = 0; i < 10; ++i) {
75 if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
76 goto i2c_done;
77 if (!(val & I2C_STATE_MASK))
78 break;
79 msleep(100);
80 }
81 if (i == 10) {
82 dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
83 goto i2c_done;
84 }
85
86
87 go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
88 go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);
89
90
91 if (!read) {
92 go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
93 go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
94 (addr << 9) | (command >> 8));
95 ret = 0;
96 goto i2c_done;
97 }
98
99
100 if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
101 goto i2c_done;
102
103
104 go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
105 (addr << 9) | 0x0100 | (command >> 8));
106
107
108 for (i = 0; i < 10; ++i) {
109 if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
110 goto i2c_done;
111 if (val & I2C_READ_READY_MASK)
112 break;
113 msleep(100);
114 }
115 if (i == 10) {
116 dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
117 goto i2c_done;
118 }
119
120
121 if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
122 goto i2c_done;
123 *data = val;
124 ret = 0;
125
126i2c_done:
127 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
128
129 go7007_write_addr(go, 0x3c82, 0x0000);
130 mutex_unlock(&adlink_mpg24_i2c_lock);
131 }
132 mutex_unlock(&go->hw_lock);
133 return ret;
134}
135
136static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
137 unsigned short flags, char read_write,
138 u8 command, int size, union i2c_smbus_data *data)
139{
140 struct go7007 *go = i2c_get_adapdata(adapter);
141
142 if (size != I2C_SMBUS_BYTE_DATA)
143 return -EIO;
144 return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
145 flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
146}
147
148
149
150
151
152
153static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
154 struct i2c_msg msgs[], int num)
155{
156 struct go7007 *go = i2c_get_adapdata(adapter);
157 int i;
158
159 for (i = 0; i < num; ++i) {
160
161
162 if (msgs[i].len == 2) {
163 if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr ||
164 (msgs[i].flags & I2C_M_RD) ||
165 !(msgs[i + 1].flags & I2C_M_RD) ||
166 msgs[i + 1].len != 1)
167 return -EIO;
168 if (go7007_i2c_xfer(go, msgs[i].addr, 1,
169 (msgs[i].buf[0] << 8) | msgs[i].buf[1],
170 0x01, &msgs[i + 1].buf[0]) < 0)
171 return -EIO;
172 ++i;
173 } else if (msgs[i].len == 3) {
174 if (msgs[i].flags & I2C_M_RD)
175 return -EIO;
176 if (msgs[i].len != 3)
177 return -EIO;
178 if (go7007_i2c_xfer(go, msgs[i].addr, 0,
179 (msgs[i].buf[0] << 8) | msgs[i].buf[1],
180 0x01, &msgs[i].buf[2]) < 0)
181 return -EIO;
182 } else
183 return -EIO;
184 }
185
186 return num;
187}
188
189static u32 go7007_functionality(struct i2c_adapter *adapter)
190{
191 return I2C_FUNC_SMBUS_BYTE_DATA;
192}
193
194static const struct i2c_algorithm go7007_algo = {
195 .smbus_xfer = go7007_smbus_xfer,
196 .master_xfer = go7007_i2c_master_xfer,
197 .functionality = go7007_functionality,
198};
199
200static struct i2c_adapter go7007_adap_templ = {
201 .owner = THIS_MODULE,
202 .name = "WIS GO7007SB",
203 .algo = &go7007_algo,
204};
205
206int go7007_i2c_init(struct go7007 *go)
207{
208 memcpy(&go->i2c_adapter, &go7007_adap_templ,
209 sizeof(go7007_adap_templ));
210 go->i2c_adapter.dev.parent = go->dev;
211 i2c_set_adapdata(&go->i2c_adapter, go);
212 if (i2c_add_adapter(&go->i2c_adapter) < 0) {
213 dev_err(go->dev,
214 "go7007-i2c: error: i2c_add_adapter failed\n");
215 return -1;
216 }
217 return 0;
218}
219