160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/*
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cx88-vp3054-i2c.c -- support for the secondary I2C bus of the
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DNTV Live! DVB-T Pro (VP-3054), wired as:
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GPIO[0] -> SCL, GPIO[1] -> SDA
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(c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include "cx88.h"
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#include "cx88-vp3054-i2c.h"
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MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
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MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
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MODULE_LICENSE("GPL");
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/* ----------------------------------------------------------------------- */
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static void vp3054_bit_setscl(void *data, int state)
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{
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struct cx8802_dev *dev = data;
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struct cx88_core *core = dev->core;
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struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
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if (state) {
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vp3054_i2c->state |= 0x0001; /* SCL high */
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vp3054_i2c->state &= ~0x0100; /* external pullup */
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} else {
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vp3054_i2c->state &= ~0x0001; /* SCL low */
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vp3054_i2c->state |= 0x0100; /* drive pin */
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}
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cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
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cx_read(MO_GP0_IO);
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}
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static void vp3054_bit_setsda(void *data, int state)
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{
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struct cx8802_dev *dev = data;
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struct cx88_core *core = dev->core;
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struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
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if (state) {
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vp3054_i2c->state |= 0x0002; /* SDA high */
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vp3054_i2c->state &= ~0x0200; /* tristate pin */
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} else {
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vp3054_i2c->state &= ~0x0002; /* SDA low */
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vp3054_i2c->state |= 0x0200; /* drive pin */
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}
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cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
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cx_read(MO_GP0_IO);
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}
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static int vp3054_bit_getscl(void *data)
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{
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struct cx8802_dev *dev = data;
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struct cx88_core *core = dev->core;
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u32 state;
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state = cx_read(MO_GP0_IO);
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return (state & 0x01) ? 1 : 0;
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}
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static int vp3054_bit_getsda(void *data)
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{
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struct cx8802_dev *dev = data;
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struct cx88_core *core = dev->core;
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u32 state;
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state = cx_read(MO_GP0_IO);
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return (state & 0x02) ? 1 : 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct i2c_algo_bit_data vp3054_i2c_algo_template = {
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.setsda = vp3054_bit_setsda,
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.setscl = vp3054_bit_setscl,
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.getsda = vp3054_bit_getsda,
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.getscl = vp3054_bit_getscl,
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.udelay = 16,
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.timeout = 200,
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};
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/* ----------------------------------------------------------------------- */
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int vp3054_i2c_probe(struct cx8802_dev *dev)
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{
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struct cx88_core *core = dev->core;
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struct vp3054_i2c_state *vp3054_i2c;
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int rc;
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if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
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return 0;
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vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
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if (vp3054_i2c == NULL)
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return -ENOMEM;
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dev->vp3054 = vp3054_i2c;
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memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template,
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sizeof(vp3054_i2c->algo));
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vp3054_i2c->adap.dev.parent = &dev->pci->dev;
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strlcpy(vp3054_i2c->adap.name, core->name,
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sizeof(vp3054_i2c->adap.name));
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vp3054_i2c->adap.owner = THIS_MODULE;
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vp3054_i2c->algo.data = dev;
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i2c_set_adapdata(&vp3054_i2c->adap, dev);
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vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
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vp3054_bit_setscl(dev,1);
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vp3054_bit_setsda(dev,1);
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rc = i2c_bit_add_bus(&vp3054_i2c->adap);
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if (0 != rc) {
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printk("%s: vp3054_i2c register FAILED\n", core->name);
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kfree(dev->vp3054);
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dev->vp3054 = NULL;
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}
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return rc;
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}
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void vp3054_i2c_remove(struct cx8802_dev *dev)
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{
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struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
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if (vp3054_i2c == NULL ||
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dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
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return;
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i2c_del_adapter(&vp3054_i2c->adap);
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kfree(vp3054_i2c);
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}
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EXPORT_SYMBOL(vp3054_i2c_probe);
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EXPORT_SYMBOL(vp3054_i2c_remove);
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