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
114int vp3054_i2c_probe(struct cx8802_dev *dev)
115{
116	struct cx88_core *core = dev->core;
117	struct vp3054_i2c_state *vp3054_i2c;
118	int rc;
119
120	if (core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
121		return 0;
122
123	dev->card_priv = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
124	if (dev->card_priv == NULL)
125		return -ENOMEM;
126	vp3054_i2c = dev->card_priv;
127
128	memcpy(&vp3054_i2c->adap, &vp3054_i2c_adap_template,
129	       sizeof(vp3054_i2c->adap));
130	memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template,
131	       sizeof(vp3054_i2c->algo));
132
133	vp3054_i2c->adap.class |= I2C_CLASS_TV_DIGITAL;
134
135	vp3054_i2c->adap.dev.parent = &dev->pci->dev;
136	strlcpy(vp3054_i2c->adap.name, core->name,
137		sizeof(vp3054_i2c->adap.name));
138	vp3054_i2c->algo.data = dev;
139	i2c_set_adapdata(&vp3054_i2c->adap, dev);
140	vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
141
142	vp3054_bit_setscl(dev,1);
143	vp3054_bit_setsda(dev,1);
144
145	rc = i2c_bit_add_bus(&vp3054_i2c->adap);
146	if (0 != rc) {
147		printk("%s: vp3054_i2c register FAILED\n", core->name);
148
149		kfree(dev->card_priv);
150		dev->card_priv = NULL;
151	}
152
153	return rc;
154}
155
156void vp3054_i2c_remove(struct cx8802_dev *dev)
157{
158	struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;
159
160	if (vp3054_i2c == NULL ||
161	    dev->core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
162		return;
163
164	i2c_del_adapter(&vp3054_i2c->adap);
165	kfree(vp3054_i2c);
166}
167
168EXPORT_SYMBOL(vp3054_i2c_probe);
169EXPORT_SYMBOL(vp3054_i2c_remove);
170