1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * cx88-vp3054-i2c.c -- support for the secondary I2C bus of the
4 * DNTV Live! DVB-T Pro (VP-3054), wired as:
5 * GPIO[0] -> SCL, GPIO[1] -> SDA
6 *
7 * (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
8 */
9
10#include "cx88.h"
11#include "cx88-vp3054-i2c.h"
12
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/init.h>
16#include <linux/io.h>
17
18MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
19MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
20MODULE_LICENSE("GPL");
21
22/* ----------------------------------------------------------------------- */
23
24static void vp3054_bit_setscl(void *data, int state)
25{
26 struct cx8802_dev *dev = data;
27 struct cx88_core *core = dev->core;
28 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
29
30 if (state) {
31 vp3054_i2c->state |= 0x0001; /* SCL high */
32 vp3054_i2c->state &= ~0x0100; /* external pullup */
33 } else {
34 vp3054_i2c->state &= ~0x0001; /* SCL low */
35 vp3054_i2c->state |= 0x0100; /* drive pin */
36 }
37 cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
38 cx_read(MO_GP0_IO);
39}
40
41static void vp3054_bit_setsda(void *data, int state)
42{
43 struct cx8802_dev *dev = data;
44 struct cx88_core *core = dev->core;
45 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
46
47 if (state) {
48 vp3054_i2c->state |= 0x0002; /* SDA high */
49 vp3054_i2c->state &= ~0x0200; /* tristate pin */
50 } else {
51 vp3054_i2c->state &= ~0x0002; /* SDA low */
52 vp3054_i2c->state |= 0x0200; /* drive pin */
53 }
54 cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
55 cx_read(MO_GP0_IO);
56}
57
58static int vp3054_bit_getscl(void *data)
59{
60 struct cx8802_dev *dev = data;
61 struct cx88_core *core = dev->core;
62 u32 state;
63
64 state = cx_read(MO_GP0_IO);
65 return (state & 0x01) ? 1 : 0;
66}
67
68static int vp3054_bit_getsda(void *data)
69{
70 struct cx8802_dev *dev = data;
71 struct cx88_core *core = dev->core;
72 u32 state;
73
74 state = cx_read(MO_GP0_IO);
75 return (state & 0x02) ? 1 : 0;
76}
77
78/* ----------------------------------------------------------------------- */
79
80static const struct i2c_algo_bit_data vp3054_i2c_algo_template = {
81 .setsda = vp3054_bit_setsda,
82 .setscl = vp3054_bit_setscl,
83 .getsda = vp3054_bit_getsda,
84 .getscl = vp3054_bit_getscl,
85 .udelay = 16,
86 .timeout = 200,
87};
88
89/* ----------------------------------------------------------------------- */
90
91int vp3054_i2c_probe(struct cx8802_dev *dev)
92{
93 struct cx88_core *core = dev->core;
94 struct vp3054_i2c_state *vp3054_i2c;
95 int rc;
96
97 if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
98 return 0;
99
100 vp3054_i2c = kzalloc(size: sizeof(*vp3054_i2c), GFP_KERNEL);
101 if (!vp3054_i2c)
102 return -ENOMEM;
103 dev->vp3054 = vp3054_i2c;
104
105 vp3054_i2c->algo = vp3054_i2c_algo_template;
106
107 vp3054_i2c->adap.dev.parent = &dev->pci->dev;
108 strscpy(vp3054_i2c->adap.name, core->name,
109 sizeof(vp3054_i2c->adap.name));
110 vp3054_i2c->adap.owner = THIS_MODULE;
111 vp3054_i2c->algo.data = dev;
112 i2c_set_adapdata(adap: &vp3054_i2c->adap, data: dev);
113 vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
114
115 vp3054_bit_setscl(data: dev, state: 1);
116 vp3054_bit_setsda(data: dev, state: 1);
117
118 rc = i2c_bit_add_bus(&vp3054_i2c->adap);
119 if (rc != 0) {
120 pr_err("vp3054_i2c register FAILED\n");
121
122 kfree(objp: dev->vp3054);
123 dev->vp3054 = NULL;
124 }
125
126 return rc;
127}
128EXPORT_SYMBOL(vp3054_i2c_probe);
129
130void vp3054_i2c_remove(struct cx8802_dev *dev)
131{
132 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
133
134 if (!vp3054_i2c ||
135 dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
136 return;
137
138 i2c_del_adapter(adap: &vp3054_i2c->adap);
139 kfree(objp: vp3054_i2c);
140}
141EXPORT_SYMBOL(vp3054_i2c_remove);
142

source code of linux/drivers/media/pci/cx88/cx88-vp3054-i2c.c