diff options
Diffstat (limited to 'drivers/media/pci/cx88/cx88-i2c.c')
| -rw-r--r-- | drivers/media/pci/cx88/cx88-i2c.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/media/pci/cx88/cx88-i2c.c b/drivers/media/pci/cx88/cx88-i2c.c new file mode 100644 index 00000000000..de0f1af74e4 --- /dev/null +++ b/drivers/media/pci/cx88/cx88-i2c.c @@ -0,0 +1,184 @@ + +/* + + cx88-i2c.c -- all the i2c code is here + + Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) + & Marcus Metzler (mocm@thp.uni-koeln.de) + (c) 2002 Yurij Sysoev <yurij@naturesoft.net> + (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> + + (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org> + - Multituner support and i2c address binding + + 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/init.h> + +#include <asm/io.h> + +#include "cx88.h" +#include <media/v4l2-common.h> + +static unsigned int i2c_debug; +module_param(i2c_debug, int, 0644); +MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]"); + +static unsigned int i2c_scan; +module_param(i2c_scan, int, 0444); +MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); + +static unsigned int i2c_udelay = 5; +module_param(i2c_udelay, int, 0644); +MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs " + "(should be 5 or higher). Lower value means higher bus speed."); + +#define dprintk(level,fmt, arg...) if (i2c_debug >= level) \ + printk(KERN_DEBUG "%s: " fmt, core->name , ## arg) + +/* ----------------------------------------------------------------------- */ + +static void cx8800_bit_setscl(void *data, int state) +{ + struct cx88_core *core = data; + + if (state) + core->i2c_state |= 0x02; + else + core->i2c_state &= ~0x02; + cx_write(MO_I2C, core->i2c_state); + cx_read(MO_I2C); +} + +static void cx8800_bit_setsda(void *data, int state) +{ + struct cx88_core *core = data; + + if (state) + core->i2c_state |= 0x01; + else + core->i2c_state &= ~0x01; + cx_write(MO_I2C, core->i2c_state); + cx_read(MO_I2C); +} + +static int cx8800_bit_getscl(void *data) +{ + struct cx88_core *core = data; + u32 state; + + state = cx_read(MO_I2C); + return state & 0x02 ? 1 : 0; +} + +static int cx8800_bit_getsda(void *data) +{ + struct cx88_core *core = data; + u32 state; + + state = cx_read(MO_I2C); + return state & 0x01; +} + +/* ----------------------------------------------------------------------- */ + +static const struct i2c_algo_bit_data cx8800_i2c_algo_template = { + .setsda = cx8800_bit_setsda, + .setscl = cx8800_bit_setscl, + .getsda = cx8800_bit_getsda, + .getscl = cx8800_bit_getscl, + .udelay = 16, + .timeout = 200, +}; + +/* ----------------------------------------------------------------------- */ + +static const char * const i2c_devs[128] = { + [ 0x1c >> 1 ] = "lgdt330x", + [ 0x86 >> 1 ] = "tda9887/cx22702", + [ 0xa0 >> 1 ] = "eeprom", + [ 0xc0 >> 1 ] = "tuner (analog)", + [ 0xc2 >> 1 ] = "tuner (analog/dvb)", + [ 0xc8 >> 1 ] = "xc5000", +}; + +static void do_i2c_scan(const char *name, struct i2c_client *c) +{ + unsigned char buf; + int i,rc; + + for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { + c->addr = i; + rc = i2c_master_recv(c,&buf,0); + if (rc < 0) + continue; + printk("%s: i2c scan: found device @ 0x%x [%s]\n", + name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); + } +} + +/* init + register i2c adapter */ +int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci) +{ + /* Prevents usage of invalid delay values */ + if (i2c_udelay<5) + i2c_udelay=5; + + memcpy(&core->i2c_algo, &cx8800_i2c_algo_template, + sizeof(core->i2c_algo)); + + + core->i2c_adap.dev.parent = &pci->dev; + strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name)); + core->i2c_adap.owner = THIS_MODULE; + core->i2c_algo.udelay = i2c_udelay; + core->i2c_algo.data = core; + i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); + core->i2c_adap.algo_data = &core->i2c_algo; + core->i2c_client.adapter = &core->i2c_adap; + strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); + + cx8800_bit_setscl(core,1); + cx8800_bit_setsda(core,1); + + core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); + if (0 == core->i2c_rc) { + static u8 tuner_data[] = + { 0x0b, 0xdc, 0x86, 0x52 }; + static struct i2c_msg tuner_msg = + { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 }; + + dprintk(1, "i2c register ok\n"); + switch( core->boardnr ) { + case CX88_BOARD_HAUPPAUGE_HVR1300: + case CX88_BOARD_HAUPPAUGE_HVR3000: + case CX88_BOARD_HAUPPAUGE_HVR4000: + printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n", + core->name); + i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1); + break; + default: + break; + } + if (i2c_scan) + do_i2c_scan(core->name,&core->i2c_client); + } else + printk("%s: i2c register FAILED\n", core->name); + + return core->i2c_rc; +} |