diff options
Diffstat (limited to 'drivers/media/video/bttv-i2c.c')
-rw-r--r-- | drivers/media/video/bttv-i2c.c | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/drivers/media/video/bttv-i2c.c b/drivers/media/video/bttv-i2c.c new file mode 100644 index 0000000..e42f1ec1 --- /dev/null +++ b/drivers/media/video/bttv-i2c.c @@ -0,0 +1,461 @@ +/* + $Id: bttv-i2c.c,v 1.18 2005/02/16 12:14:10 kraxel Exp $ + + bttv-i2c.c -- all the i2c code is here + + bttv - Bt848 frame grabber driver + + Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) + & Marcus Metzler (mocm@thp.uni-koeln.de) + (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> + + 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 <linux/delay.h> +#include <asm/io.h> + +#include "bttvp.h" + +static struct i2c_algo_bit_data bttv_i2c_algo_bit_template; +static struct i2c_adapter bttv_i2c_adap_sw_template; +static struct i2c_adapter bttv_i2c_adap_hw_template; +static struct i2c_client bttv_i2c_client_template; + +static int attach_inform(struct i2c_client *client); + +static int i2c_debug = 0; +static int i2c_hw = 0; +static int i2c_scan = 0; +module_param(i2c_debug, int, 0644); +module_param(i2c_hw, int, 0444); +module_param(i2c_scan, int, 0444); +MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); + +/* ----------------------------------------------------------------------- */ +/* I2C functions - bitbanging adapter (software i2c) */ + +static void bttv_bit_setscl(void *data, int state) +{ + struct bttv *btv = (struct bttv*)data; + + if (state) + btv->i2c_state |= 0x02; + else + btv->i2c_state &= ~0x02; + btwrite(btv->i2c_state, BT848_I2C); + btread(BT848_I2C); +} + +static void bttv_bit_setsda(void *data, int state) +{ + struct bttv *btv = (struct bttv*)data; + + if (state) + btv->i2c_state |= 0x01; + else + btv->i2c_state &= ~0x01; + btwrite(btv->i2c_state, BT848_I2C); + btread(BT848_I2C); +} + +static int bttv_bit_getscl(void *data) +{ + struct bttv *btv = (struct bttv*)data; + int state; + + state = btread(BT848_I2C) & 0x02 ? 1 : 0; + return state; +} + +static int bttv_bit_getsda(void *data) +{ + struct bttv *btv = (struct bttv*)data; + int state; + + state = btread(BT848_I2C) & 0x01; + return state; +} + +static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = { + .setsda = bttv_bit_setsda, + .setscl = bttv_bit_setscl, + .getsda = bttv_bit_getsda, + .getscl = bttv_bit_getscl, + .udelay = 16, + .mdelay = 10, + .timeout = 200, +}; + +static struct i2c_adapter bttv_i2c_adap_sw_template = { + .owner = THIS_MODULE, +#ifdef I2C_CLASS_TV_ANALOG + .class = I2C_CLASS_TV_ANALOG, +#endif + I2C_DEVNAME("bt848"), + .id = I2C_HW_B_BT848, + .client_register = attach_inform, +}; + +/* ----------------------------------------------------------------------- */ +/* I2C functions - hardware i2c */ + +static int algo_control(struct i2c_adapter *adapter, + unsigned int cmd, unsigned long arg) +{ + return 0; +} + +static u32 functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_SMBUS_EMUL; +} + +static int +bttv_i2c_wait_done(struct bttv *btv) +{ + DECLARE_WAITQUEUE(wait, current); + int rc = 0; + + add_wait_queue(&btv->i2c_queue, &wait); + if (0 == btv->i2c_done) + msleep_interruptible(20); + remove_wait_queue(&btv->i2c_queue, &wait); + + if (0 == btv->i2c_done) + /* timeout */ + rc = -EIO; + if (btv->i2c_done & BT848_INT_RACK) + rc = 1; + btv->i2c_done = 0; + return rc; +} + +#define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\ + BT848_I2C_SCL | BT848_I2C_SDA) + +static int +bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last) +{ + u32 xmit; + int retval,cnt; + + /* sanity checks */ + if (0 == msg->len) + return -EINVAL; + + /* start, address + first byte */ + xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW; + if (msg->len > 1 || !last) + xmit |= BT878_I2C_NOSTOP; + btwrite(xmit, BT848_I2C); + retval = bttv_i2c_wait_done(btv); + if (retval < 0) + goto err; + if (retval == 0) + goto eio; + if (i2c_debug) { + printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]); + if (!(xmit & BT878_I2C_NOSTOP)) + printk(" >\n"); + } + + for (cnt = 1; cnt < msg->len; cnt++ ) { + /* following bytes */ + xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART; + if (cnt < msg->len-1 || !last) + xmit |= BT878_I2C_NOSTOP; + btwrite(xmit, BT848_I2C); + retval = bttv_i2c_wait_done(btv); + if (retval < 0) + goto err; + if (retval == 0) + goto eio; + if (i2c_debug) { + printk(" %02x", msg->buf[cnt]); + if (!(xmit & BT878_I2C_NOSTOP)) + printk(" >\n"); + } + } + return msg->len; + + eio: + retval = -EIO; + err: + if (i2c_debug) + printk(" ERR: %d\n",retval); + return retval; +} + +static int +bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last) +{ + u32 xmit; + u32 cnt; + int retval; + + for(cnt = 0; cnt < msg->len; cnt++) { + xmit = (msg->addr << 25) | (1 << 24) | I2C_HW; + if (cnt < msg->len-1) + xmit |= BT848_I2C_W3B; + if (cnt < msg->len-1 || !last) + xmit |= BT878_I2C_NOSTOP; + if (cnt) + xmit |= BT878_I2C_NOSTART; + btwrite(xmit, BT848_I2C); + retval = bttv_i2c_wait_done(btv); + if (retval < 0) + goto err; + if (retval == 0) + goto eio; + msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff; + if (i2c_debug) { + if (!(xmit & BT878_I2C_NOSTART)) + printk(" <R %02x", (msg->addr << 1) +1); + printk(" =%02x", msg->buf[cnt]); + if (!(xmit & BT878_I2C_NOSTOP)) + printk(" >\n"); + } + } + return msg->len; + + eio: + retval = -EIO; + err: + if (i2c_debug) + printk(" ERR: %d\n",retval); + return retval; +} + +static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) +{ + struct bttv *btv = i2c_get_adapdata(i2c_adap); + int retval = 0; + int i; + + if (i2c_debug) + printk("bt-i2c:"); + btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT); + for (i = 0 ; i < num; i++) { + if (msgs[i].flags & I2C_M_RD) { + /* read */ + retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num); + if (retval < 0) + goto err; + } else { + /* write */ + retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num); + if (retval < 0) + goto err; + } + } + return num; + + err: + return retval; +} + +static struct i2c_algorithm bttv_algo = { + .name = "bt878", + .id = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */, + .master_xfer = bttv_i2c_xfer, + .algo_control = algo_control, + .functionality = functionality, +}; + +static struct i2c_adapter bttv_i2c_adap_hw_template = { + .owner = THIS_MODULE, +#ifdef I2C_CLASS_TV_ANALOG + .class = I2C_CLASS_TV_ANALOG, +#endif + I2C_DEVNAME("bt878"), + .id = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */, + .algo = &bttv_algo, + .client_register = attach_inform, +}; + +/* ----------------------------------------------------------------------- */ +/* I2C functions - common stuff */ + +static int attach_inform(struct i2c_client *client) +{ + struct bttv *btv = i2c_get_adapdata(client->adapter); + + if (btv->tuner_type != UNSET) + bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type); + if (btv->pinnacle_id != UNSET) + bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE, + &btv->pinnacle_id); + if (bttv_debug) + printk("bttv%d: i2c attach [client=%s]\n", + btv->c.nr, i2c_clientname(client)); + return 0; +} + +void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg) +{ + if (0 != btv->i2c_rc) + return; + i2c_clients_command(&btv->c.i2c_adap, cmd, arg); +} + +static struct i2c_client bttv_i2c_client_template = { + I2C_DEVNAME("bttv internal"), +}; + + +/* read I2C */ +int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for) +{ + unsigned char buffer = 0; + + if (0 != btv->i2c_rc) + return -1; + if (bttv_verbose && NULL != probe_for) + printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ", + btv->c.nr,probe_for,addr); + btv->i2c_client.addr = addr >> 1; + if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) { + if (NULL != probe_for) { + if (bttv_verbose) + printk("not found\n"); + } else + printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n", + btv->c.nr,addr); + return -1; + } + if (bttv_verbose && NULL != probe_for) + printk("found\n"); + return buffer; +} + +/* write I2C */ +int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1, + unsigned char b2, int both) +{ + unsigned char buffer[2]; + int bytes = both ? 2 : 1; + + if (0 != btv->i2c_rc) + return -1; + btv->i2c_client.addr = addr >> 1; + buffer[0] = b1; + buffer[1] = b2; + if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes)) + return -1; + return 0; +} + +/* read EEPROM content */ +void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr) +{ + btv->i2c_client.addr = addr >> 1; + tveeprom_read(&btv->i2c_client, eedata, 256); +} + +static char *i2c_devs[128] = { + [ 0x30 >> 1 ] = "IR (hauppauge)", + [ 0x80 >> 1 ] = "msp34xx", + [ 0x86 >> 1 ] = "tda9887", + [ 0xa0 >> 1 ] = "eeprom", + [ 0xc0 >> 1 ] = "tuner (analog)", + [ 0xc2 >> 1 ] = "tuner (analog)", +}; + +static void do_i2c_scan(char *name, struct i2c_client *c) +{ + unsigned char buf; + int i,rc; + + for (i = 0; i < 128; 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 algo-bit adapter */ +int __devinit init_bttv_i2c(struct bttv *btv) +{ + memcpy(&btv->i2c_client, &bttv_i2c_client_template, + sizeof(bttv_i2c_client_template)); + + if (i2c_hw) + btv->use_i2c_hw = 1; + if (btv->use_i2c_hw) { + /* bt878 */ + memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template, + sizeof(bttv_i2c_adap_hw_template)); + } else { + /* bt848 */ + memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template, + sizeof(bttv_i2c_adap_sw_template)); + memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template, + sizeof(bttv_i2c_algo_bit_template)); + btv->i2c_algo.data = btv; + btv->c.i2c_adap.algo_data = &btv->i2c_algo; + } + + btv->c.i2c_adap.dev.parent = &btv->c.pci->dev; + snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name), + "bt%d #%d [%s]", btv->id, btv->c.nr, + btv->use_i2c_hw ? "hw" : "sw"); + + i2c_set_adapdata(&btv->c.i2c_adap, btv); + btv->i2c_client.adapter = &btv->c.i2c_adap; + +#ifdef I2C_CLASS_TV_ANALOG + if (bttv_tvcards[btv->c.type].no_video) + btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG; + if (bttv_tvcards[btv->c.type].has_dvb) + btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL; +#endif + + if (btv->use_i2c_hw) { + btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap); + } else { + bttv_bit_setscl(btv,1); + bttv_bit_setsda(btv,1); + btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap); + } + if (0 == btv->i2c_rc && i2c_scan) + do_i2c_scan(btv->c.name,&btv->i2c_client); + return btv->i2c_rc; +} + +int __devexit fini_bttv_i2c(struct bttv *btv) +{ + if (0 != btv->i2c_rc) + return 0; + + if (btv->use_i2c_hw) { + return i2c_del_adapter(&btv->c.i2c_adap); + } else { + return i2c_bit_del_bus(&btv->c.i2c_adap); + } +} + +/* + * Local variables: + * c-basic-offset: 8 + * End: + */ |