| /* |
| bttv-if.c -- interfaces to other kernel modules |
| all the i2c code is here |
| also the gpio interface exported by bttv (used by lirc) |
| |
| 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) 1999,2000 Gerd Knorr <kraxel@goldbach.in-berlin.de> |
| |
| 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. |
| |
| */ |
| |
| #define __NO_VERSION__ 1 |
| |
| #include <linux/version.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| |
| #include <asm/io.h> |
| |
| #include "bttvp.h" |
| #include "tuner.h" |
| |
| static struct i2c_algo_bit_data bttv_i2c_algo_template; |
| static struct i2c_adapter bttv_i2c_adap_template; |
| static struct i2c_client bttv_i2c_client_template; |
| |
| EXPORT_SYMBOL(bttv_get_cardinfo); |
| EXPORT_SYMBOL(bttv_get_id); |
| EXPORT_SYMBOL(bttv_gpio_enable); |
| EXPORT_SYMBOL(bttv_read_gpio); |
| EXPORT_SYMBOL(bttv_write_gpio); |
| EXPORT_SYMBOL(bttv_get_gpio_queue); |
| |
| /* ----------------------------------------------------------------------- */ |
| /* Exported functions - for other modules which want to access the */ |
| /* gpio ports (IR for example) */ |
| /* see bttv.h for comments */ |
| |
| int bttv_get_cardinfo(unsigned int card, int *type, int *cardid) |
| { |
| if (card >= bttv_num) { |
| return -1; |
| } |
| *type = bttvs[card].type; |
| *cardid = bttvs[card].cardid; |
| return 0; |
| } |
| |
| int bttv_get_id(unsigned int card) |
| { |
| printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n"); |
| if (card >= bttv_num) { |
| return -1; |
| } |
| return bttvs[card].type; |
| } |
| |
| int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data) |
| { |
| struct bttv *btv; |
| |
| if (card >= bttv_num) { |
| return -EINVAL; |
| } |
| |
| btv = &bttvs[card]; |
| btaor(data, ~mask, BT848_GPIO_OUT_EN); |
| if (bttv_gpio) |
| bttv_gpio_tracking(btv,"extern enable"); |
| return 0; |
| } |
| |
| int bttv_read_gpio(unsigned int card, unsigned long *data) |
| { |
| struct bttv *btv; |
| |
| if (card >= bttv_num) { |
| return -EINVAL; |
| } |
| |
| btv = &bttvs[card]; |
| |
| if(btv->shutdown) { |
| return -ENODEV; |
| } |
| |
| /* prior setting BT848_GPIO_REG_INP is (probably) not needed |
| because we set direct input on init */ |
| *data = btread(BT848_GPIO_DATA); |
| return 0; |
| } |
| |
| int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data) |
| { |
| struct bttv *btv; |
| |
| if (card >= bttv_num) { |
| return -EINVAL; |
| } |
| |
| btv = &bttvs[card]; |
| |
| /* prior setting BT848_GPIO_REG_INP is (probably) not needed |
| because direct input is set on init */ |
| btaor(data & mask, ~mask, BT848_GPIO_DATA); |
| if (bttv_gpio) |
| bttv_gpio_tracking(btv,"extern write"); |
| return 0; |
| } |
| |
| wait_queue_head_t* bttv_get_gpio_queue(unsigned int card) |
| { |
| struct bttv *btv; |
| |
| if (card >= bttv_num) { |
| return NULL; |
| } |
| |
| btv = &bttvs[card]; |
| if (bttvs[card].shutdown) { |
| return NULL; |
| } |
| return &btv->gpioq; |
| } |
| |
| |
| /* ----------------------------------------------------------------------- */ |
| /* I2C functions */ |
| |
| 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); |
| } |
| |
| 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 void bttv_inc_use(struct i2c_adapter *adap) |
| { |
| MOD_INC_USE_COUNT; |
| } |
| |
| static void bttv_dec_use(struct i2c_adapter *adap) |
| { |
| MOD_DEC_USE_COUNT; |
| } |
| |
| static int attach_inform(struct i2c_client *client) |
| { |
| struct bttv *btv = (struct bttv*)client->adapter->data; |
| int i; |
| |
| for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| if (btv->i2c_clients[i] == NULL) { |
| btv->i2c_clients[i] = client; |
| break; |
| } |
| } |
| if (btv->tuner_type != -1) |
| bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type); |
| if (bttv_verbose) |
| printk("bttv%d: i2c attach [client=%s,%s]\n",btv->nr, |
| client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed"); |
| return 0; |
| } |
| |
| static int detach_inform(struct i2c_client *client) |
| { |
| struct bttv *btv = (struct bttv*)client->adapter->data; |
| int i; |
| |
| for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| if (btv->i2c_clients[i] == client) { |
| btv->i2c_clients[i] = NULL; |
| break; |
| } |
| } |
| if (bttv_verbose) |
| printk("bttv%d: i2c detach [client=%s,%s]\n",btv->nr, |
| client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed"); |
| return 0; |
| } |
| |
| void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg) |
| { |
| int i; |
| |
| for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| if (NULL == btv->i2c_clients[i]) |
| continue; |
| if (NULL == btv->i2c_clients[i]->driver->command) |
| continue; |
| btv->i2c_clients[i]->driver->command( |
| btv->i2c_clients[i],cmd,arg); |
| } |
| } |
| |
| static struct i2c_algo_bit_data bttv_i2c_algo_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_template = { |
| name: "bt848", |
| id: I2C_HW_B_BT848, |
| inc_use: bttv_inc_use, |
| dec_use: bttv_dec_use, |
| client_register: attach_inform, |
| client_unregister: detach_inform, |
| }; |
| |
| static struct i2c_client bttv_i2c_client_template = { |
| name: "bttv internal use only", |
| id: -1, |
| }; |
| |
| |
| /* 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->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->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) |
| { |
| int i; |
| |
| if (bttv_I2CWrite(btv, addr, 0, -1, 0)<0) { |
| printk(KERN_WARNING "bttv: readee error\n"); |
| return; |
| } |
| btv->i2c_client.addr = addr >> 1; |
| for (i=0; i<256; i+=16) { |
| if (16 != i2c_master_recv(&btv->i2c_client,eedata+i,16)) { |
| printk(KERN_WARNING "bttv: readee error\n"); |
| break; |
| } |
| } |
| } |
| |
| /* init + register i2c algo-bit adapter */ |
| int __devinit init_bttv_i2c(struct bttv *btv) |
| { |
| memcpy(&btv->i2c_adap, &bttv_i2c_adap_template, |
| sizeof(struct i2c_adapter)); |
| memcpy(&btv->i2c_algo, &bttv_i2c_algo_template, |
| sizeof(struct i2c_algo_bit_data)); |
| memcpy(&btv->i2c_client, &bttv_i2c_client_template, |
| sizeof(struct i2c_client)); |
| |
| sprintf(btv->i2c_adap.name+strlen(btv->i2c_adap.name), |
| " #%d", btv->nr); |
| btv->i2c_algo.data = btv; |
| btv->i2c_adap.data = btv; |
| btv->i2c_adap.algo_data = &btv->i2c_algo; |
| btv->i2c_client.adapter = &btv->i2c_adap; |
| |
| bttv_bit_setscl(btv,1); |
| bttv_bit_setsda(btv,1); |
| |
| btv->i2c_rc = i2c_bit_add_bus(&btv->i2c_adap); |
| return btv->i2c_rc; |
| } |
| |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |