cx88-vp3054-i2c.c revision 3269711b76ba27b78862c48398b0d313ccaa99c2 
1/*
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    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 2 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23*/
24
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/init.h>
28
29#include <asm/io.h>
30
31#include "cx88.h"
32#include "cx88-vp3054-i2c.h"
33
34
35MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
36MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
37MODULE_LICENSE("GPL");
38
39/* ----------------------------------------------------------------------- */
40
41static void vp3054_bit_setscl(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->card_priv;
46
47	if (state) {
48		vp3054_i2c->state |=  0x0001;	/* SCL high */
49		vp3054_i2c->state &= ~0x0100;	/* external pullup */
50	} else {
51		vp3054_i2c->state &= ~0x0001;	/* SCL low */
52		vp3054_i2c->state |=  0x0100;	/* drive pin */
53	}
54	cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
55	cx_read(MO_GP0_IO);
56}
57
58static void vp3054_bit_setsda(void *data, int state)
59{
60	struct cx8802_dev *dev = data;
61	struct cx88_core *core = dev->core;
62	struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;
63
64	if (state) {
65		vp3054_i2c->state |=  0x0002;	/* SDA high */
66		vp3054_i2c->state &= ~0x0200;	/* tristate pin */
67	} else {
68		vp3054_i2c->state &= ~0x0002;	/* SDA low */
69		vp3054_i2c->state |=  0x0200;	/* drive pin */
70	}
71	cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
72	cx_read(MO_GP0_IO);
73}
74
75static int vp3054_bit_getscl(void *data)
76{
77	struct cx8802_dev *dev = data;
78	struct cx88_core *core = dev->core;
79	u32 state;
80
81	state = cx_read(MO_GP0_IO);
82	return (state & 0x01) ? 1 : 0;
83}
84
85static int vp3054_bit_getsda(void *data)
86{
87	struct cx8802_dev *dev = data;
88	struct cx88_core *core = dev->core;
89	u32 state;
90
91	state = cx_read(MO_GP0_IO);
92	return (state & 0x02) ? 1 : 0;
93}
94
95/* ----------------------------------------------------------------------- */
96
97static struct i2c_algo_bit_data vp3054_i2c_algo_template = {
98	.setsda  = vp3054_bit_setsda,
99	.setscl  = vp3054_bit_setscl,
100	.getsda  = vp3054_bit_getsda,
101	.getscl  = vp3054_bit_getscl,
102	.udelay  = 16,
103	.timeout = 200,
104};
105
106/* ----------------------------------------------------------------------- */
107
108static struct i2c_adapter vp3054_i2c_adap_template = {
109	.name              = "cx2388x",
110	.owner             = THIS_MODULE,
111	.id                = I2C_HW_B_CX2388x,
112};
113
114static struct i2c_client vp3054_i2c_client_template = {
115	.name	= "VP-3054",
116};
117
118int vp3054_i2c_probe(struct cx8802_dev *dev)
119{
120	struct cx88_core *core = dev->core;
121	struct vp3054_i2c_state *vp3054_i2c;
122	int rc;
123
124	if (core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
125		return 0;
126
127	dev->card_priv = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
128	if (dev->card_priv == NULL)
129		return -ENOMEM;
130	vp3054_i2c = dev->card_priv;
131
132	memcpy(&vp3054_i2c->adap, &vp3054_i2c_adap_template,
133	       sizeof(vp3054_i2c->adap));
134	memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template,
135	       sizeof(vp3054_i2c->algo));
136	memcpy(&vp3054_i2c->client, &vp3054_i2c_client_template,
137	       sizeof(vp3054_i2c->client));
138
139	vp3054_i2c->adap.class |= I2C_CLASS_TV_DIGITAL;
140
141	vp3054_i2c->adap.dev.parent = &dev->pci->dev;
142	strlcpy(vp3054_i2c->adap.name, core->name,
143		sizeof(vp3054_i2c->adap.name));
144	vp3054_i2c->algo.data = dev;
145	i2c_set_adapdata(&vp3054_i2c->adap, dev);
146	vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
147	vp3054_i2c->client.adapter = &vp3054_i2c->adap;
148
149	vp3054_bit_setscl(dev,1);
150	vp3054_bit_setsda(dev,1);
151
152	rc = i2c_bit_add_bus(&vp3054_i2c->adap);
153	if (0 != rc) {
154		printk("%s: vp3054_i2c register FAILED\n", core->name);
155
156		kfree(dev->card_priv);
157		dev->card_priv = NULL;
158	}
159
160	return rc;
161}
162
163void vp3054_i2c_remove(struct cx8802_dev *dev)
164{
165	struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;
166
167	if (vp3054_i2c == NULL ||
168	    dev->core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
169		return;
170
171	i2c_del_adapter(&vp3054_i2c->adap);
172	kfree(vp3054_i2c);
173}
174
175EXPORT_SYMBOL(vp3054_i2c_probe);
176EXPORT_SYMBOL(vp3054_i2c_remove);
177