Merge tag 'arm-defconfig-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[linux-2.6-microblaze.git] / drivers / media / usb / go7007 / go7007-i2c.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2005-2006 Micronas USA Inc.
4  */
5
6 #include <linux/module.h>
7 #include <linux/delay.h>
8 #include <linux/sched.h>
9 #include <linux/list.h>
10 #include <linux/unistd.h>
11 #include <linux/time.h>
12 #include <linux/device.h>
13 #include <linux/i2c.h>
14 #include <linux/mutex.h>
15 #include <linux/uaccess.h>
16
17 #include "go7007-priv.h"
18
19 /********************* Driver for on-board I2C adapter *********************/
20
21 /* #define GO7007_I2C_DEBUG */
22
23 #define SPI_I2C_ADDR_BASE               0x1400
24 #define STATUS_REG_ADDR                 (SPI_I2C_ADDR_BASE + 0x2)
25 #define I2C_CTRL_REG_ADDR               (SPI_I2C_ADDR_BASE + 0x6)
26 #define I2C_DEV_UP_ADDR_REG_ADDR        (SPI_I2C_ADDR_BASE + 0x7)
27 #define I2C_LO_ADDR_REG_ADDR            (SPI_I2C_ADDR_BASE + 0x8)
28 #define I2C_DATA_REG_ADDR               (SPI_I2C_ADDR_BASE + 0x9)
29 #define I2C_CLKFREQ_REG_ADDR            (SPI_I2C_ADDR_BASE + 0xa)
30
31 #define I2C_STATE_MASK                  0x0007
32 #define I2C_READ_READY_MASK             0x0008
33
34 /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
35  * on the Adlink PCI-MPG24, so access is shared between all of them. */
36 static DEFINE_MUTEX(adlink_mpg24_i2c_lock);
37
38 static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
39                 u16 command, int flags, u8 *data)
40 {
41         int i, ret = -EIO;
42         u16 val;
43
44         if (go->status == STATUS_SHUTDOWN)
45                 return -ENODEV;
46
47 #ifdef GO7007_I2C_DEBUG
48         if (read)
49                 dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",
50                         command, addr);
51         else
52                 dev_dbg(go->dev,
53                         "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
54                         *data, command, addr);
55 #endif
56
57         mutex_lock(&go->hw_lock);
58
59         if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
60                 /* Bridge the I2C port on this GO7007 to the shared bus */
61                 mutex_lock(&adlink_mpg24_i2c_lock);
62                 go7007_write_addr(go, 0x3c82, 0x0020);
63         }
64
65         /* Wait for I2C adapter to be ready */
66         for (i = 0; i < 10; ++i) {
67                 if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
68                         goto i2c_done;
69                 if (!(val & I2C_STATE_MASK))
70                         break;
71                 msleep(100);
72         }
73         if (i == 10) {
74                 dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
75                 goto i2c_done;
76         }
77
78         /* Set target register (command) */
79         go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
80         go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);
81
82         /* If we're writing, send the data and target address and we're done */
83         if (!read) {
84                 go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
85                 go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
86                                         (addr << 9) | (command >> 8));
87                 ret = 0;
88                 goto i2c_done;
89         }
90
91         /* Otherwise, we're reading.  First clear i2c_rx_data_rdy. */
92         if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
93                 goto i2c_done;
94
95         /* Send the target address plus read flag */
96         go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
97                         (addr << 9) | 0x0100 | (command >> 8));
98
99         /* Wait for i2c_rx_data_rdy */
100         for (i = 0; i < 10; ++i) {
101                 if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
102                         goto i2c_done;
103                 if (val & I2C_READ_READY_MASK)
104                         break;
105                 msleep(100);
106         }
107         if (i == 10) {
108                 dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
109                 goto i2c_done;
110         }
111
112         /* Retrieve the read byte */
113         if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
114                 goto i2c_done;
115         *data = val;
116         ret = 0;
117
118 i2c_done:
119         if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
120                 /* Isolate the I2C port on this GO7007 from the shared bus */
121                 go7007_write_addr(go, 0x3c82, 0x0000);
122                 mutex_unlock(&adlink_mpg24_i2c_lock);
123         }
124         mutex_unlock(&go->hw_lock);
125         return ret;
126 }
127
128 static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
129                 unsigned short flags, char read_write,
130                 u8 command, int size, union i2c_smbus_data *data)
131 {
132         struct go7007 *go = i2c_get_adapdata(adapter);
133
134         if (size != I2C_SMBUS_BYTE_DATA)
135                 return -EIO;
136         return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
137                         flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
138 }
139
140 /* VERY LIMITED I2C master xfer function -- only needed because the
141  * SMBus functions only support 8-bit commands and the SAA7135 uses
142  * 16-bit commands.  The I2C interface on the GO7007, as limited as
143  * it is, does support this mode. */
144
145 static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
146                                         struct i2c_msg msgs[], int num)
147 {
148         struct go7007 *go = i2c_get_adapdata(adapter);
149         int i;
150
151         for (i = 0; i < num; ++i) {
152                 /* We can only do two things here -- write three bytes, or
153                  * write two bytes and read one byte. */
154                 if (msgs[i].len == 2) {
155                         if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr ||
156                                         (msgs[i].flags & I2C_M_RD) ||
157                                         !(msgs[i + 1].flags & I2C_M_RD) ||
158                                         msgs[i + 1].len != 1)
159                                 return -EIO;
160                         if (go7007_i2c_xfer(go, msgs[i].addr, 1,
161                                         (msgs[i].buf[0] << 8) | msgs[i].buf[1],
162                                         0x01, &msgs[i + 1].buf[0]) < 0)
163                                 return -EIO;
164                         ++i;
165                 } else if (msgs[i].len == 3) {
166                         if (msgs[i].flags & I2C_M_RD)
167                                 return -EIO;
168                         if (msgs[i].len != 3)
169                                 return -EIO;
170                         if (go7007_i2c_xfer(go, msgs[i].addr, 0,
171                                         (msgs[i].buf[0] << 8) | msgs[i].buf[1],
172                                         0x01, &msgs[i].buf[2]) < 0)
173                                 return -EIO;
174                 } else
175                         return -EIO;
176         }
177
178         return num;
179 }
180
181 static u32 go7007_functionality(struct i2c_adapter *adapter)
182 {
183         return I2C_FUNC_SMBUS_BYTE_DATA;
184 }
185
186 static const struct i2c_algorithm go7007_algo = {
187         .smbus_xfer     = go7007_smbus_xfer,
188         .master_xfer    = go7007_i2c_master_xfer,
189         .functionality  = go7007_functionality,
190 };
191
192 static struct i2c_adapter go7007_adap_templ = {
193         .owner                  = THIS_MODULE,
194         .name                   = "WIS GO7007SB",
195         .algo                   = &go7007_algo,
196 };
197
198 int go7007_i2c_init(struct go7007 *go)
199 {
200         memcpy(&go->i2c_adapter, &go7007_adap_templ,
201                         sizeof(go7007_adap_templ));
202         go->i2c_adapter.dev.parent = go->dev;
203         i2c_set_adapdata(&go->i2c_adapter, go);
204         if (i2c_add_adapter(&go->i2c_adapter) < 0) {
205                 dev_err(go->dev,
206                         "go7007-i2c: error: i2c_add_adapter failed\n");
207                 return -1;
208         }
209         return 0;
210 }