1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * cx88-vp3054-i2c.c -- support for the secondary I2C bus of the
4*4882a593Smuzhiyun * DNTV Live! DVB-T Pro (VP-3054), wired as:
5*4882a593Smuzhiyun * GPIO[0] -> SCL, GPIO[1] -> SDA
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include "cx88.h"
11*4882a593Smuzhiyun #include "cx88-vp3054-i2c.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/slab.h>
15*4882a593Smuzhiyun #include <linux/init.h>
16*4882a593Smuzhiyun #include <linux/io.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
19*4882a593Smuzhiyun MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
20*4882a593Smuzhiyun MODULE_LICENSE("GPL");
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* ----------------------------------------------------------------------- */
23*4882a593Smuzhiyun
vp3054_bit_setscl(void * data,int state)24*4882a593Smuzhiyun static void vp3054_bit_setscl(void *data, int state)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun struct cx8802_dev *dev = data;
27*4882a593Smuzhiyun struct cx88_core *core = dev->core;
28*4882a593Smuzhiyun struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (state) {
31*4882a593Smuzhiyun vp3054_i2c->state |= 0x0001; /* SCL high */
32*4882a593Smuzhiyun vp3054_i2c->state &= ~0x0100; /* external pullup */
33*4882a593Smuzhiyun } else {
34*4882a593Smuzhiyun vp3054_i2c->state &= ~0x0001; /* SCL low */
35*4882a593Smuzhiyun vp3054_i2c->state |= 0x0100; /* drive pin */
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
38*4882a593Smuzhiyun cx_read(MO_GP0_IO);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
vp3054_bit_setsda(void * data,int state)41*4882a593Smuzhiyun static void vp3054_bit_setsda(void *data, int state)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun struct cx8802_dev *dev = data;
44*4882a593Smuzhiyun struct cx88_core *core = dev->core;
45*4882a593Smuzhiyun struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (state) {
48*4882a593Smuzhiyun vp3054_i2c->state |= 0x0002; /* SDA high */
49*4882a593Smuzhiyun vp3054_i2c->state &= ~0x0200; /* tristate pin */
50*4882a593Smuzhiyun } else {
51*4882a593Smuzhiyun vp3054_i2c->state &= ~0x0002; /* SDA low */
52*4882a593Smuzhiyun vp3054_i2c->state |= 0x0200; /* drive pin */
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
55*4882a593Smuzhiyun cx_read(MO_GP0_IO);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
vp3054_bit_getscl(void * data)58*4882a593Smuzhiyun static int vp3054_bit_getscl(void *data)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun struct cx8802_dev *dev = data;
61*4882a593Smuzhiyun struct cx88_core *core = dev->core;
62*4882a593Smuzhiyun u32 state;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun state = cx_read(MO_GP0_IO);
65*4882a593Smuzhiyun return (state & 0x01) ? 1 : 0;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
vp3054_bit_getsda(void * data)68*4882a593Smuzhiyun static int vp3054_bit_getsda(void *data)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun struct cx8802_dev *dev = data;
71*4882a593Smuzhiyun struct cx88_core *core = dev->core;
72*4882a593Smuzhiyun u32 state;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun state = cx_read(MO_GP0_IO);
75*4882a593Smuzhiyun return (state & 0x02) ? 1 : 0;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun /* ----------------------------------------------------------------------- */
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun static const struct i2c_algo_bit_data vp3054_i2c_algo_template = {
81*4882a593Smuzhiyun .setsda = vp3054_bit_setsda,
82*4882a593Smuzhiyun .setscl = vp3054_bit_setscl,
83*4882a593Smuzhiyun .getsda = vp3054_bit_getsda,
84*4882a593Smuzhiyun .getscl = vp3054_bit_getscl,
85*4882a593Smuzhiyun .udelay = 16,
86*4882a593Smuzhiyun .timeout = 200,
87*4882a593Smuzhiyun };
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun /* ----------------------------------------------------------------------- */
90*4882a593Smuzhiyun
vp3054_i2c_probe(struct cx8802_dev * dev)91*4882a593Smuzhiyun int vp3054_i2c_probe(struct cx8802_dev *dev)
92*4882a593Smuzhiyun {
93*4882a593Smuzhiyun struct cx88_core *core = dev->core;
94*4882a593Smuzhiyun struct vp3054_i2c_state *vp3054_i2c;
95*4882a593Smuzhiyun int rc;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
98*4882a593Smuzhiyun return 0;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
101*4882a593Smuzhiyun if (!vp3054_i2c)
102*4882a593Smuzhiyun return -ENOMEM;
103*4882a593Smuzhiyun dev->vp3054 = vp3054_i2c;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun vp3054_i2c->algo = vp3054_i2c_algo_template;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun vp3054_i2c->adap.dev.parent = &dev->pci->dev;
108*4882a593Smuzhiyun strscpy(vp3054_i2c->adap.name, core->name,
109*4882a593Smuzhiyun sizeof(vp3054_i2c->adap.name));
110*4882a593Smuzhiyun vp3054_i2c->adap.owner = THIS_MODULE;
111*4882a593Smuzhiyun vp3054_i2c->algo.data = dev;
112*4882a593Smuzhiyun i2c_set_adapdata(&vp3054_i2c->adap, dev);
113*4882a593Smuzhiyun vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun vp3054_bit_setscl(dev, 1);
116*4882a593Smuzhiyun vp3054_bit_setsda(dev, 1);
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun rc = i2c_bit_add_bus(&vp3054_i2c->adap);
119*4882a593Smuzhiyun if (rc != 0) {
120*4882a593Smuzhiyun pr_err("vp3054_i2c register FAILED\n");
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun kfree(dev->vp3054);
123*4882a593Smuzhiyun dev->vp3054 = NULL;
124*4882a593Smuzhiyun }
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun return rc;
127*4882a593Smuzhiyun }
128*4882a593Smuzhiyun EXPORT_SYMBOL(vp3054_i2c_probe);
129*4882a593Smuzhiyun
vp3054_i2c_remove(struct cx8802_dev * dev)130*4882a593Smuzhiyun void vp3054_i2c_remove(struct cx8802_dev *dev)
131*4882a593Smuzhiyun {
132*4882a593Smuzhiyun struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun if (!vp3054_i2c ||
135*4882a593Smuzhiyun dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
136*4882a593Smuzhiyun return;
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun i2c_del_adapter(&vp3054_i2c->adap);
139*4882a593Smuzhiyun kfree(vp3054_i2c);
140*4882a593Smuzhiyun }
141*4882a593Smuzhiyun EXPORT_SYMBOL(vp3054_i2c_remove);
142