Merge tag '5.7-rc-smb3-fixes-part1' of git://git.samba.org/sfrench/cifs-2.6
[sfrench/cifs-2.6.git] / drivers / media / pci / ngene / ngene-i2c.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ngene-i2c.c: nGene PCIe bridge driver i2c functions
4  *
5  * Copyright (C) 2005-2007 Micronas
6  *
7  * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
8  *                         Modifications for new nGene firmware,
9  *                         support for EEPROM-copying,
10  *                         support for new dual DVB-S2 card prototype
11  */
12
13 /* FIXME - some of these can probably be removed */
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/poll.h>
19 #include <linux/io.h>
20 #include <asm/div64.h>
21 #include <linux/pci.h>
22 #include <linux/pci_ids.h>
23 #include <linux/timer.h>
24 #include <linux/byteorder/generic.h>
25 #include <linux/firmware.h>
26 #include <linux/vmalloc.h>
27
28 #include "ngene.h"
29
30 /* Firmware command for i2c operations */
31 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
32                            u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
33 {
34         struct ngene_command com;
35
36         com.cmd.hdr.Opcode = CMD_I2C_READ;
37         com.cmd.hdr.Length = outlen + 3;
38         com.cmd.I2CRead.Device = adr << 1;
39         memcpy(com.cmd.I2CRead.Data, out, outlen);
40         com.cmd.I2CRead.Data[outlen] = inlen;
41         com.cmd.I2CRead.Data[outlen + 1] = 0;
42         com.in_len = outlen + 3;
43         com.out_len = inlen + 1;
44
45         if (ngene_command(dev, &com) < 0)
46                 return -EIO;
47
48         if ((com.cmd.raw8[0] >> 1) != adr)
49                 return -EIO;
50
51         if (flag)
52                 memcpy(in, com.cmd.raw8, inlen + 1);
53         else
54                 memcpy(in, com.cmd.raw8 + 1, inlen);
55         return 0;
56 }
57
58 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
59                                    u8 *out, u8 outlen)
60 {
61         struct ngene_command com;
62
63
64         com.cmd.hdr.Opcode = CMD_I2C_WRITE;
65         com.cmd.hdr.Length = outlen + 1;
66         com.cmd.I2CRead.Device = adr << 1;
67         memcpy(com.cmd.I2CRead.Data, out, outlen);
68         com.in_len = outlen + 1;
69         com.out_len = 1;
70
71         if (ngene_command(dev, &com) < 0)
72                 return -EIO;
73
74         if (com.cmd.raw8[0] == 1)
75                 return -EIO;
76
77         return 0;
78 }
79
80 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
81 {
82         if (!(dev->card_info->i2c_access & 2))
83                 return;
84         if (dev->i2c_current_bus == bus)
85                 return;
86
87         switch (bus) {
88         case 0:
89                 ngene_command_gpio_set(dev, 3, 0);
90                 ngene_command_gpio_set(dev, 2, 1);
91                 break;
92
93         case 1:
94                 ngene_command_gpio_set(dev, 2, 0);
95                 ngene_command_gpio_set(dev, 3, 1);
96                 break;
97         }
98         dev->i2c_current_bus = bus;
99 }
100
101 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
102                                  struct i2c_msg msg[], int num)
103 {
104         struct ngene_channel *chan =
105                 (struct ngene_channel *)i2c_get_adapdata(adapter);
106         struct ngene *dev = chan->dev;
107
108         mutex_lock(&dev->i2c_switch_mutex);
109         ngene_i2c_set_bus(dev, chan->number);
110
111         if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
112                 if (!ngene_command_i2c_read(dev, msg[0].addr,
113                                             msg[0].buf, msg[0].len,
114                                             msg[1].buf, msg[1].len, 0))
115                         goto done;
116
117         if (num == 1 && !(msg[0].flags & I2C_M_RD))
118                 if (!ngene_command_i2c_write(dev, msg[0].addr,
119                                              msg[0].buf, msg[0].len))
120                         goto done;
121         if (num == 1 && (msg[0].flags & I2C_M_RD))
122                 if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
123                                             msg[0].buf, msg[0].len, 0))
124                         goto done;
125
126         mutex_unlock(&dev->i2c_switch_mutex);
127         return -EIO;
128
129 done:
130         mutex_unlock(&dev->i2c_switch_mutex);
131         return num;
132 }
133
134
135 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
136 {
137         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
138 }
139
140 static const struct i2c_algorithm ngene_i2c_algo = {
141         .master_xfer = ngene_i2c_master_xfer,
142         .functionality = ngene_i2c_functionality,
143 };
144
145 int ngene_i2c_init(struct ngene *dev, int dev_nr)
146 {
147         struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
148
149         i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
150
151         strscpy(adap->name, "nGene", sizeof(adap->name));
152
153         adap->algo = &ngene_i2c_algo;
154         adap->algo_data = (void *)&(dev->channel[dev_nr]);
155         adap->dev.parent = &dev->pci_dev->dev;
156
157         return i2c_add_adapter(adap);
158 }
159