[net-next-2.6.git] / drivers / media / video / cx88 / cx88-vp3054-i2c.c

/*

    cx88-vp3054-i2c.c  --  support for the secondary I2C bus of the
			   DNTV Live! DVB-T Pro (VP-3054), wired as:
			   GPIO[0] -> SCL, GPIO[1] -> SDA

    (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>

#include <asm/io.h>

#include "cx88.h"
#include "cx88-vp3054-i2c.h"


MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
MODULE_LICENSE("GPL");

/* ----------------------------------------------------------------------- */

static void vp3054_bit_setscl(void *data, int state)
{
	struct cx8802_dev *dev = data;
	struct cx88_core *core = dev->core;
	struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;

	if (state) {
		vp3054_i2c->state |=  0x0001;	/* SCL high */
		vp3054_i2c->state &= ~0x0100;	/* external pullup */
	} else {
		vp3054_i2c->state &= ~0x0001;	/* SCL low */
		vp3054_i2c->state |=  0x0100;	/* drive pin */
	}
	cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
	cx_read(MO_GP0_IO);
}

static void vp3054_bit_setsda(void *data, int state)
{
	struct cx8802_dev *dev = data;
	struct cx88_core *core = dev->core;
	struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;

	if (state) {
		vp3054_i2c->state |=  0x0002;	/* SDA high */
		vp3054_i2c->state &= ~0x0200;	/* tristate pin */
	} else {
		vp3054_i2c->state &= ~0x0002;	/* SDA low */
		vp3054_i2c->state |=  0x0200;	/* drive pin */
	}
	cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
	cx_read(MO_GP0_IO);
}

static int vp3054_bit_getscl(void *data)
{
	struct cx8802_dev *dev = data;
	struct cx88_core *core = dev->core;
	u32 state;

	state = cx_read(MO_GP0_IO);
	return (state & 0x01) ? 1 : 0;
}

static int vp3054_bit_getsda(void *data)
{
	struct cx8802_dev *dev = data;
	struct cx88_core *core = dev->core;
	u32 state;

	state = cx_read(MO_GP0_IO);
	return (state & 0x02) ? 1 : 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_algo_bit_data vp3054_i2c_algo_template = {
	.setsda  = vp3054_bit_setsda,
	.setscl  = vp3054_bit_setscl,
	.getsda  = vp3054_bit_getsda,
	.getscl  = vp3054_bit_getscl,
	.udelay  = 16,
	.timeout = 200,
};

/* ----------------------------------------------------------------------- */

static struct i2c_adapter vp3054_i2c_adap_template = {
	.name              = "cx2388x",
	.owner             = THIS_MODULE,
	.id                = I2C_HW_B_CX2388x,
};

int vp3054_i2c_probe(struct cx8802_dev *dev)
{
	struct cx88_core *core = dev->core;
	struct vp3054_i2c_state *vp3054_i2c;
	int rc;

	if (core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
		return 0;

	dev->card_priv = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
	if (dev->card_priv == NULL)
		return -ENOMEM;
	vp3054_i2c = dev->card_priv;

	memcpy(&vp3054_i2c->adap, &vp3054_i2c_adap_template,
	       sizeof(vp3054_i2c->adap));
	memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template,
	       sizeof(vp3054_i2c->algo));

	vp3054_i2c->adap.class |= I2C_CLASS_TV_DIGITAL;

	vp3054_i2c->adap.dev.parent = &dev->pci->dev;
	strlcpy(vp3054_i2c->adap.name, core->name,
		sizeof(vp3054_i2c->adap.name));
	vp3054_i2c->algo.data = dev;
	i2c_set_adapdata(&vp3054_i2c->adap, dev);
	vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;

	vp3054_bit_setscl(dev,1);
	vp3054_bit_setsda(dev,1);

	rc = i2c_bit_add_bus(&vp3054_i2c->adap);
	if (0 != rc) {
		printk("%s: vp3054_i2c register FAILED\n", core->name);

		kfree(dev->card_priv);
		dev->card_priv = NULL;
	}

	return rc;
}

void vp3054_i2c_remove(struct cx8802_dev *dev)
{
	struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;

	if (vp3054_i2c == NULL ||
	    dev->core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
		return;

	i2c_del_adapter(&vp3054_i2c->adap);
	kfree(vp3054_i2c);
}

EXPORT_SYMBOL(vp3054_i2c_probe);
EXPORT_SYMBOL(vp3054_i2c_remove);
Commit	Line	Data
fc40b261 CP	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
45bf2daa MCC	35	MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
	36	MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
	37	MODULE_LICENSE("GPL");
	38
fc40b261 CP	39	/* ----------------------------------------------------------------------- */
	40
	41	static 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
	58	static 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
	75	static 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
	85	static 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
	97	static 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,
fc40b261 CP	103	.timeout = 200,
	104	};
	105
	106	/* ----------------------------------------------------------------------- */
	107
	108	static struct i2c_adapter vp3054_i2c_adap_template = {
	109	.name = "cx2388x",
	110	.owner = THIS_MODULE,
	111	.id = I2C_HW_B_CX2388x,
	112	};
	113
fc40b261 CP	114	int 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));
fc40b261 CP	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;
fc40b261 CP	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
	156	void 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
3269711b	164	i2c_del_adapter(&vp3054_i2c->adap);
fc40b261 CP	165	kfree(vp3054_i2c);
	166	}
	167
	168	EXPORT_SYMBOL(vp3054_i2c_probe);
	169	EXPORT_SYMBOL(vp3054_i2c_remove);