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linux/drivers/media/video/cx18/cx18-i2c.c
Jean Delvare a824f0f445 [media] video: Drop undue references to i2c-algo-bit 
There's one comment that has been copied from bttv to many other
media/video drivers:

/* init + register i2c algo-bit adapter */

Meanwhile, many drivers use hardware I2C implementations instead of
relying on i2c-algo-bit, so this comment is misleading. Remove the
reference to "algo-bit" from all drivers, to avoid any confusion. This
is the best way to ensure that the comments won't go out of sync
again. Anyone interested in the implementation details would rather
look at the code itself.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-11-24 15:11:17 -02:00

331 lines
9.4 KiB
C
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/*
* cx18 I2C functions
*
* Derived from ivtv-i2c.c
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
* Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
*
* 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., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*/
#include "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-cards.h"
#include "cx18-gpio.h"
#include "cx18-i2c.h"
#include "cx18-irq.h"
#define CX18_REG_I2C_1_WR 0xf15000
#define CX18_REG_I2C_1_RD 0xf15008
#define CX18_REG_I2C_2_WR 0xf25100
#define CX18_REG_I2C_2_RD 0xf25108
#define SETSCL_BIT 0x0001
#define SETSDL_BIT 0x0002
#define GETSCL_BIT 0x0004
#define GETSDL_BIT 0x0008
#define CX18_CS5345_I2C_ADDR 0x4c
#define CX18_Z8F0811_IR_TX_I2C_ADDR 0x70
#define CX18_Z8F0811_IR_RX_I2C_ADDR 0x71
/* This array should match the CX18_HW_ defines */
static const u8 hw_addrs[] = {
0, /* CX18_HW_TUNER */
0, /* CX18_HW_TVEEPROM */
CX18_CS5345_I2C_ADDR, /* CX18_HW_CS5345 */
0, /* CX18_HW_DVB */
0, /* CX18_HW_418_AV */
0, /* CX18_HW_GPIO_MUX */
0, /* CX18_HW_GPIO_RESET_CTRL */
CX18_Z8F0811_IR_TX_I2C_ADDR, /* CX18_HW_Z8F0811_IR_TX_HAUP */
CX18_Z8F0811_IR_RX_I2C_ADDR, /* CX18_HW_Z8F0811_IR_RX_HAUP */
};
/* This array should match the CX18_HW_ defines */
/* This might well become a card-specific array */
static const u8 hw_bus[] = {
1, /* CX18_HW_TUNER */
0, /* CX18_HW_TVEEPROM */
0, /* CX18_HW_CS5345 */
0, /* CX18_HW_DVB */
0, /* CX18_HW_418_AV */
0, /* CX18_HW_GPIO_MUX */
0, /* CX18_HW_GPIO_RESET_CTRL */
0, /* CX18_HW_Z8F0811_IR_TX_HAUP */
0, /* CX18_HW_Z8F0811_IR_RX_HAUP */
};
/* This array should match the CX18_HW_ defines */
static const char * const hw_devicenames[] = {
"tuner",
"tveeprom",
"cs5345",
"cx23418_DTV",
"cx23418_AV",
"gpio_mux",
"gpio_reset_ctrl",
"ir_tx_z8f0811_haup",
"ir_rx_z8f0811_haup",
};
static int cx18_i2c_new_ir(struct cx18 *cx, struct i2c_adapter *adap, u32 hw,
const char *type, u8 addr)
{
struct i2c_board_info info;
struct IR_i2c_init_data *init_data = &cx->ir_i2c_init_data;
unsigned short addr_list[2] = { addr, I2C_CLIENT_END };
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, type, I2C_NAME_SIZE);
/* Our default information for ir-kbd-i2c.c to use */
switch (hw) {
case CX18_HW_Z8F0811_IR_RX_HAUP:
init_data->ir_codes = RC_MAP_HAUPPAUGE;
init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
init_data->type = RC_TYPE_RC5;
init_data->name = cx->card_name;
info.platform_data = init_data;
break;
}
return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
-1 : 0;
}
int cx18_i2c_register(struct cx18 *cx, unsigned idx)
{
struct v4l2_subdev *sd;
int bus = hw_bus[idx];
struct i2c_adapter *adap = &cx->i2c_adap[bus];
const char *type = hw_devicenames[idx];
u32 hw = 1 << idx;
if (idx >= ARRAY_SIZE(hw_addrs))
return -1;
if (hw == CX18_HW_TUNER) {
/* special tuner group handling */
sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
adap, type, 0, cx->card_i2c->radio);
if (sd != NULL)
sd->grp_id = hw;
sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
adap, type, 0, cx->card_i2c->demod);
if (sd != NULL)
sd->grp_id = hw;
sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
adap, type, 0, cx->card_i2c->tv);
if (sd != NULL)
sd->grp_id = hw;
return sd != NULL ? 0 : -1;
}
if (hw & CX18_HW_IR_ANY)
return cx18_i2c_new_ir(cx, adap, hw, type, hw_addrs[idx]);
/* Is it not an I2C device or one we do not wish to register? */
if (!hw_addrs[idx])
return -1;
/* It's an I2C device other than an analog tuner or IR chip */
sd = v4l2_i2c_new_subdev(&cx->v4l2_dev, adap, type, hw_addrs[idx],
NULL);
if (sd != NULL)
sd->grp_id = hw;
return sd != NULL ? 0 : -1;
}
/* Find the first member of the subdev group id in hw */
struct v4l2_subdev *cx18_find_hw(struct cx18 *cx, u32 hw)
{
struct v4l2_subdev *result = NULL;
struct v4l2_subdev *sd;
spin_lock(&cx->v4l2_dev.lock);
v4l2_device_for_each_subdev(sd, &cx->v4l2_dev) {
if (sd->grp_id == hw) {
result = sd;
break;
}
}
spin_unlock(&cx->v4l2_dev.lock);
return result;
}
static void cx18_setscl(void *data, int state)
{
struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
u32 r = cx18_read_reg(cx, addr);
if (state)
cx18_write_reg(cx, r | SETSCL_BIT, addr);
else
cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
}
static void cx18_setsda(void *data, int state)
{
struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
u32 r = cx18_read_reg(cx, addr);
if (state)
cx18_write_reg(cx, r | SETSDL_BIT, addr);
else
cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
}
static int cx18_getscl(void *data)
{
struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
return cx18_read_reg(cx, addr) & GETSCL_BIT;
}
static int cx18_getsda(void *data)
{
struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
return cx18_read_reg(cx, addr) & GETSDL_BIT;
}
/* template for i2c-bit-algo */
static struct i2c_adapter cx18_i2c_adap_template = {
.name = "cx18 i2c driver",
.algo = NULL, /* set by i2c-algo-bit */
.algo_data = NULL, /* filled from template */
.owner = THIS_MODULE,
};
#define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
#define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
static struct i2c_algo_bit_data cx18_i2c_algo_template = {
.setsda = cx18_setsda,
.setscl = cx18_setscl,
.getsda = cx18_getsda,
.getscl = cx18_getscl,
.udelay = CX18_SCL_PERIOD/2, /* 1/2 clock period in usec*/
.timeout = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
};
/* init + register i2c adapter */
int init_cx18_i2c(struct cx18 *cx)
{
int i, err;
CX18_DEBUG_I2C("i2c init\n");
for (i = 0; i < 2; i++) {
/* Setup algorithm for adapter */
memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
sizeof(struct i2c_algo_bit_data));
cx->i2c_algo_cb_data[i].cx = cx;
cx->i2c_algo_cb_data[i].bus_index = i;
cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
/* Setup adapter */
memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
sizeof(struct i2c_adapter));
cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
" #%d-%d", cx->instance, i);
i2c_set_adapdata(&cx->i2c_adap[i], &cx->v4l2_dev);
cx->i2c_adap[i].dev.parent = &cx->pci_dev->dev;
}
if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
/* Reset/Unreset I2C hardware block */
/* Clock select 220MHz */
cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
0x00000000, 0x10001000);
/* Clock Enable */
cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
0x00001000, 0x10001000);
}
/* courtesy of Steven Toth <stoth@hauppauge.com> */
cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
mdelay(10);
cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
mdelay(10);
cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
mdelay(10);
/* Set to edge-triggered intrs. */
cx18_write_reg(cx, 0x00c00000, 0xc730c8);
/* Clear any stale intrs */
cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
~(HW2_I2C1_INT|HW2_I2C2_INT), HW2_I2C1_INT|HW2_I2C2_INT);
/* Hw I2C1 Clock Freq ~100kHz */
cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
/* Hw I2C2 Clock Freq ~100kHz */
cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
core, reset, (u32) CX18_GPIO_RESET_I2C);
err = i2c_bit_add_bus(&cx->i2c_adap[0]);
if (err)
goto err;
err = i2c_bit_add_bus(&cx->i2c_adap[1]);
if (err)
goto err_del_bus_0;
return 0;
err_del_bus_0:
i2c_del_adapter(&cx->i2c_adap[0]);
err:
return err;
}
void exit_cx18_i2c(struct cx18 *cx)
{
int i;
CX18_DEBUG_I2C("i2c exit\n");
cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
CX18_REG_I2C_1_WR);
cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
CX18_REG_I2C_2_WR);
for (i = 0; i < 2; i++) {
i2c_del_adapter(&cx->i2c_adap[i]);
}
}
/*
Hauppauge HVR1600 should have:
32 cx24227
98 unknown
a0 eeprom
c2 tuner
e? zilog ir
*/
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