mirror of
https://github.com/torvalds/linux.git
synced 2024-12-17 16:43:08 +00:00
b52377475a
This kind of memcpy() is error-prone. Its replacement with a struct assignment is prefered because it's type-safe and much easier to read. Found by coccinelle. Hand patched and reviewed. Tested by compilation only. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier struct_name; struct struct_name to; struct struct_name from; expression E; @@ -memcpy(&(to), &(from), E); +to = from; // </smpl> Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com> Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
159 lines
4.1 KiB
C
159 lines
4.1 KiB
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/slab.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->vp3054;
|
|
|
|
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->vp3054;
|
|
|
|
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 const 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,
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
int vp3054_i2c_probe(struct cx8802_dev *dev)
|
|
{
|
|
struct cx88_core *core = dev->core;
|
|
struct vp3054_i2c_state *vp3054_i2c;
|
|
int rc;
|
|
|
|
if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
|
|
return 0;
|
|
|
|
vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
|
|
if (vp3054_i2c == NULL)
|
|
return -ENOMEM;
|
|
dev->vp3054 = vp3054_i2c;
|
|
|
|
vp3054_i2c->algo = vp3054_i2c_algo_template;
|
|
|
|
vp3054_i2c->adap.dev.parent = &dev->pci->dev;
|
|
strlcpy(vp3054_i2c->adap.name, core->name,
|
|
sizeof(vp3054_i2c->adap.name));
|
|
vp3054_i2c->adap.owner = THIS_MODULE;
|
|
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->vp3054);
|
|
dev->vp3054 = NULL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void vp3054_i2c_remove(struct cx8802_dev *dev)
|
|
{
|
|
struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
|
|
|
|
if (vp3054_i2c == NULL ||
|
|
dev->core->boardnr != 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);
|