patch-2.4.0-test7 linux/drivers/media/video/bttv-if.c

• Lines: 338
• Date: Tue Jul 18 22:35:33 2000
• Orig file: v2.4.0-test6/linux/drivers/media/video/bttv-if.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test6/linux/drivers/media/video/bttv-if.c linux/drivers/media/video/bttv-if.c
@@ -0,0 +1,337 @@
+/*
+    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 "bttv.h"
+#include "tuner.h"
+
+
+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+	printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");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);
+	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);
+	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]->driver->id == client->driver->id) {
+			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 [%s]\n",btv->nr,client->name);
+        return 0;
+}
+
+static int detach_inform(struct i2c_client *client)
+{
+        struct bttv *btv = (struct bttv*)client->adapter->data;
+	int i;
+
+        if (bttv_verbose)
+		printk("bttv%d: i2c detach [%s]\n",btv->nr,client->name);
+	for (i = 0; i < I2C_CLIENTS_MAX; i++) {
+		if (NULL != btv->i2c_clients[i] &&
+		    btv->i2c_clients[i]->driver->id == client->driver->id) {
+			btv->i2c_clients[i] = NULL;
+			break;
+		}
+	}
+        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);
+	}
+}
+
+struct i2c_algo_bit_data bttv_i2c_algo_template = {
+	NULL,
+	bttv_bit_setsda,
+	bttv_bit_setscl,
+	bttv_bit_getsda,
+	bttv_bit_getscl,
+	10, 10, 100,
+};
+
+struct i2c_adapter bttv_i2c_adap_template = {
+	"bt848",
+	I2C_HW_B_BT848,
+	NULL,
+	NULL,
+	bttv_inc_use,
+	bttv_dec_use,
+	attach_inform,
+	detach_inform,
+	NULL,
+};
+
+struct i2c_client bttv_i2c_client_template = {
+        "bttv internal",
+        -1,
+        0,
+        0,
+        NULL,
+        NULL
+};
+
+
+/* read I2C */
+int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for) 
+{
+        unsigned char buffer = 0;
+
+	if (0 != btv->i2c_ok)
+		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_ok)
+		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;
+		}
+	}
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */