+++ /dev/null
-/*
- * Generic i2c interface for linux
- *
- * (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
- *
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/i2c-old.h>
-
-#define REGPRINT(x) if (verbose) (x)
-#define I2C_DEBUG(x) if (i2c_debug) (x)
-
-static int scan = 0;
-static int verbose = 0;
-static int i2c_debug = 0;
-
-#if LINUX_VERSION_CODE >= 0x020117
-MODULE_PARM(scan,"i");
-MODULE_PARM(verbose,"i");
-MODULE_PARM(i2c_debug,"i");
-#endif
-
-/* ----------------------------------------------------------------------- */
-
-static struct i2c_bus *busses[I2C_BUS_MAX];
-static struct i2c_driver *drivers[I2C_DRIVER_MAX];
-static int bus_count = 0, driver_count = 0;
-
-#ifdef CONFIG_VIDEO_BUZ
-extern int saa7111_init(void);
-extern int saa7185_init(void);
-#endif
-#ifdef CONFIG_VIDEO_LML33
-extern int bt819_init(void);
-extern int bt856_init(void);
-#endif
-
-int i2c_init(void)
-{
- printk(KERN_INFO "i2c: initialized%s\n",
- scan ? " (i2c bus scan enabled)" : "");
- /* anything to do here ? */
-#ifdef CONFIG_VIDEO_BUZ
- saa7111_init();
- saa7185_init();
-#endif
-#ifdef CONFIG_VIDEO_LML33
- bt819_init();
- bt856_init();
-#endif
- return 0;
-}
-
-/* ----------------------------------------------------------------------- */
-
-static void i2c_attach_device(struct i2c_bus *bus, struct i2c_driver *driver)
-{
- struct i2c_device *device;
- int i,j,ack=1;
- unsigned char addr;
- LOCK_FLAGS;
-
- /* probe for device */
- LOCK_I2C_BUS(bus);
- for (addr = driver->addr_l; addr <= driver->addr_h; addr += 2)
- {
- i2c_start(bus);
- ack = i2c_sendbyte(bus,addr,0);
- i2c_stop(bus);
- if (!ack)
- break;
- }
- UNLOCK_I2C_BUS(bus);
- if (ack)
- return;
-
- /* got answer */
- for (i = 0; i < I2C_DEVICE_MAX; i++)
- if (NULL == driver->devices[i])
- break;
- if (I2C_DEVICE_MAX == i)
- return;
-
- for (j = 0; j < I2C_DEVICE_MAX; j++)
- if (NULL == bus->devices[j])
- break;
- if (I2C_DEVICE_MAX == j)
- return;
-
- if (NULL == (device = kmalloc(sizeof(struct i2c_device),GFP_KERNEL)))
- return;
- device->bus = bus;
- device->driver = driver;
- device->addr = addr;
-
- /* Attach */
-
- if (driver->attach(device)!=0)
- {
- kfree(device);
- return;
- }
- driver->devices[i] = device;
- driver->devcount++;
- bus->devices[j] = device;
- bus->devcount++;
-
- if (bus->attach_inform)
- bus->attach_inform(bus,driver->id);
- REGPRINT(printk("i2c: device attached: %s (addr=0x%02x, bus=%s, driver=%s)\n",device->name,addr,bus->name,driver->name));
-}
-
-static void i2c_detach_device(struct i2c_device *device)
-{
- int i;
-
- if (device->bus->detach_inform)
- device->bus->detach_inform(device->bus,device->driver->id);
- device->driver->detach(device);
-
- for (i = 0; i < I2C_DEVICE_MAX; i++)
- if (device == device->driver->devices[i])
- break;
- if (I2C_DEVICE_MAX == i)
- {
- printk(KERN_WARNING "i2c: detach_device #1: device not found: %s\n",
- device->name);
- return;
- }
- device->driver->devices[i] = NULL;
- device->driver->devcount--;
-
- for (i = 0; i < I2C_DEVICE_MAX; i++)
- if (device == device->bus->devices[i])
- break;
- if (I2C_DEVICE_MAX == i)
- {
- printk(KERN_WARNING "i2c: detach_device #2: device not found: %s\n",
- device->name);
- return;
- }
- device->bus->devices[i] = NULL;
- device->bus->devcount--;
-
- REGPRINT(printk("i2c: device detached: %s (addr=0x%02x, bus=%s, driver=%s)\n",device->name,device->addr,device->bus->name,device->driver->name));
- kfree(device);
-}
-
-/* ----------------------------------------------------------------------- */
-
-int i2c_register_bus(struct i2c_bus *bus)
-{
- int i,ack;
- LOCK_FLAGS;
-
- memset(bus->devices,0,sizeof(bus->devices));
- bus->devcount = 0;
-
- for (i = 0; i < I2C_BUS_MAX; i++)
- if (NULL == busses[i])
- break;
- if (I2C_BUS_MAX == i)
- return -ENOMEM;
-
- busses[i] = bus;
- bus_count++;
- REGPRINT(printk("i2c: bus registered: %s\n",bus->name));
-
- MOD_INC_USE_COUNT;
-
- if (scan)
- {
- /* scan whole i2c bus */
- LOCK_I2C_BUS(bus);
- for (i = 0; i < 256; i+=2)
- {
- i2c_start(bus);
- ack = i2c_sendbyte(bus,i,0);
- i2c_stop(bus);
- if (!ack)
- {
- printk(KERN_INFO "i2c: scanning bus %s: found device at addr=0x%02x\n",
- bus->name,i);
- }
- }
- UNLOCK_I2C_BUS(bus);
- }
-
- /* probe available drivers */
- for (i = 0; i < I2C_DRIVER_MAX; i++)
- if (drivers[i])
- i2c_attach_device(bus,drivers[i]);
- return 0;
-}
-
-int i2c_unregister_bus(struct i2c_bus *bus)
-{
- int i;
-
- /* detach devices */
- for (i = 0; i < I2C_DEVICE_MAX; i++)
- if (bus->devices[i])
- i2c_detach_device(bus->devices[i]);
-
- for (i = 0; i < I2C_BUS_MAX; i++)
- if (bus == busses[i])
- break;
- if (I2C_BUS_MAX == i)
- {
- printk(KERN_WARNING "i2c: unregister_bus #1: bus not found: %s\n",
- bus->name);
- return -ENODEV;
- }
-
- MOD_DEC_USE_COUNT;
-
- busses[i] = NULL;
- bus_count--;
- REGPRINT(printk("i2c: bus unregistered: %s\n",bus->name));
-
- return 0;
-}
-
-/* ----------------------------------------------------------------------- */
-
-int i2c_register_driver(struct i2c_driver *driver)
-{
- int i;
-
- memset(driver->devices,0,sizeof(driver->devices));
- driver->devcount = 0;
-
- for (i = 0; i < I2C_DRIVER_MAX; i++)
- if (NULL == drivers[i])
- break;
- if (I2C_DRIVER_MAX == i)
- return -ENOMEM;
-
- drivers[i] = driver;
- driver_count++;
-
- MOD_INC_USE_COUNT;
-
- REGPRINT(printk("i2c: driver registered: %s\n",driver->name));
-
- /* Probe available busses */
- for (i = 0; i < I2C_BUS_MAX; i++)
- if (busses[i])
- i2c_attach_device(busses[i],driver);
-
- return 0;
-}
-
-int i2c_unregister_driver(struct i2c_driver *driver)
-{
- int i;
-
- /* detach devices */
- for (i = 0; i < I2C_DEVICE_MAX; i++)
- if (driver->devices[i])
- i2c_detach_device(driver->devices[i]);
-
- for (i = 0; i < I2C_DRIVER_MAX; i++)
- if (driver == drivers[i])
- break;
- if (I2C_DRIVER_MAX == i)
- {
- printk(KERN_WARNING "i2c: unregister_driver: driver not found: %s\n",
- driver->name);
- return -ENODEV;
- }
-
- MOD_DEC_USE_COUNT;
-
- drivers[i] = NULL;
- driver_count--;
- REGPRINT(printk("i2c: driver unregistered: %s\n",driver->name));
-
- return 0;
-}
-
-/* ----------------------------------------------------------------------- */
-
-int i2c_control_device(struct i2c_bus *bus, int id,
- unsigned int cmd, void *arg)
-{
- int i;
-
- for (i = 0; i < I2C_DEVICE_MAX; i++)
- if (bus->devices[i] && bus->devices[i]->driver->id == id)
- break;
- if (i == I2C_DEVICE_MAX)
- return -ENODEV;
- if (NULL == bus->devices[i]->driver->command)
- return -ENODEV;
- return bus->devices[i]->driver->command(bus->devices[i],cmd,arg);
-}
-
-/* ----------------------------------------------------------------------- */
-
-#define I2C_SET(bus,ctrl,data) (bus->i2c_setlines(bus,ctrl,data))
-#define I2C_GET(bus) (bus->i2c_getdataline(bus))
-
-void i2c_start(struct i2c_bus *bus)
-{
- I2C_SET(bus,0,1);
- I2C_SET(bus,1,1);
- I2C_SET(bus,1,0);
- I2C_SET(bus,0,0);
- I2C_DEBUG(printk("%s: < ",bus->name));
-}
-
-void i2c_stop(struct i2c_bus *bus)
-{
- I2C_SET(bus,0,0);
- I2C_SET(bus,1,0);
- I2C_SET(bus,1,1);
- I2C_DEBUG(printk(">\n"));
-}
-
-void i2c_one(struct i2c_bus *bus)
-{
- I2C_SET(bus,0,1);
- I2C_SET(bus,1,1);
- I2C_SET(bus,0,1);
-}
-
-void i2c_zero(struct i2c_bus *bus)
-{
- I2C_SET(bus,0,0);
- I2C_SET(bus,1,0);
- I2C_SET(bus,0,0);
-}
-
-int i2c_ack(struct i2c_bus *bus)
-{
- int ack;
-
- I2C_SET(bus,0,1);
- I2C_SET(bus,1,1);
- ack = I2C_GET(bus);
- I2C_SET(bus,0,1);
- return ack;
-}
-
-int i2c_sendbyte(struct i2c_bus *bus,unsigned char data,int wait_for_ack)
-{
- int i, ack;
-
- I2C_SET(bus,0,0);
- for (i=7; i>=0; i--)
- (data&(1<<i)) ? i2c_one(bus) : i2c_zero(bus);
- if (wait_for_ack)
- udelay(wait_for_ack);
- ack=i2c_ack(bus);
- I2C_DEBUG(printk("%02x%c ",(int)data,ack?'-':'+'));
- return ack;
-}
-
-unsigned char i2c_readbyte(struct i2c_bus *bus,int last)
-{
- int i;
- unsigned char data=0;
-
- I2C_SET(bus,0,1);
- for (i=7; i>=0; i--)
- {
- I2C_SET(bus,1,1);
- if (I2C_GET(bus))
- data |= (1<<i);
- I2C_SET(bus,0,1);
- }
- last ? i2c_one(bus) : i2c_zero(bus);
- I2C_DEBUG(printk("=%02x%c ",(int)data,last?'-':'+'));
- return data;
-}
-
-/* ----------------------------------------------------------------------- */
-
-int i2c_read(struct i2c_bus *bus, unsigned char addr)
-{
- int ret;
-
- if (bus->i2c_read)
- return bus->i2c_read(bus, addr);
-
- i2c_start(bus);
- i2c_sendbyte(bus,addr,0);
- ret = i2c_readbyte(bus,1);
- i2c_stop(bus);
- return ret;
-}
-
-int i2c_write(struct i2c_bus *bus, unsigned char addr,
- unsigned char data1, unsigned char data2, int both)
-{
- int ack;
-
- if (bus->i2c_write)
- return bus->i2c_write(bus, addr, data1, data2, both);
-
- i2c_start(bus);
- i2c_sendbyte(bus,addr,0);
- ack = i2c_sendbyte(bus,data1,0);
- if (both)
- ack = i2c_sendbyte(bus,data2,0);
- i2c_stop(bus);
- return ack ? -1 : 0 ;
-}
-
-/* ----------------------------------------------------------------------- */
-
-#ifdef MODULE
-
-#if LINUX_VERSION_CODE >= 0x020100
-EXPORT_SYMBOL(i2c_register_bus);
-EXPORT_SYMBOL(i2c_unregister_bus);
-EXPORT_SYMBOL(i2c_register_driver);
-EXPORT_SYMBOL(i2c_unregister_driver);
-EXPORT_SYMBOL(i2c_control_device);
-EXPORT_SYMBOL(i2c_start);
-EXPORT_SYMBOL(i2c_stop);
-EXPORT_SYMBOL(i2c_one);
-EXPORT_SYMBOL(i2c_zero);
-EXPORT_SYMBOL(i2c_ack);
-EXPORT_SYMBOL(i2c_sendbyte);
-EXPORT_SYMBOL(i2c_readbyte);
-EXPORT_SYMBOL(i2c_read);
-EXPORT_SYMBOL(i2c_write);
-#endif
-
-int init_module(void)
-{
- return i2c_init();
-}
-
-void cleanup_module(void)
-{
-}
-#endif
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * I2C driver for parallel port
- *
- * Author: Phil Blundell <philb@gnu.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 driver implements a simple I2C protocol by bit-twiddling some
- * signals on the parallel port. Since the outputs on the parallel port
- * aren't open collector, three lines rather than two are used:
- *
- * D0 clock out
- * D1 data out
- * BUSY data in
- */
-
-#include <linux/parport.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/i2c-old.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-
-#define I2C_DELAY 10
-
-static int debug = 0;
-
-struct parport_i2c_bus
-{
- struct i2c_bus i2c;
- struct parport_i2c_bus *next;
-};
-
-static struct parport_i2c_bus *bus_list;
-
-static spinlock_t bus_list_lock = SPIN_LOCK_UNLOCKED;
-
-/* software I2C functions */
-
-static void i2c_setlines(struct i2c_bus *bus, int clk, int data)
-{
- struct parport *p = bus->data;
- parport_write_data(p, (clk?1:0) | (data?2:0));
- udelay(I2C_DELAY);
-}
-
-static int i2c_getdataline(struct i2c_bus *bus)
-{
- struct parport *p = bus->data;
- return (parport_read_status(p) & PARPORT_STATUS_BUSY) ? 0 : 1;
-}
-
-static struct i2c_bus parport_i2c_bus_template =
-{
- "...",
- I2C_BUSID_PARPORT,
- NULL,
-
- SPIN_LOCK_UNLOCKED,
-
- NULL,
- NULL,
-
- i2c_setlines,
- i2c_getdataline,
- NULL,
- NULL,
-};
-
-static void i2c_parport_attach(struct parport *port)
-{
- struct parport_i2c_bus *b = kmalloc(sizeof(struct parport_i2c_bus),
- GFP_KERNEL);
- if (!b) {
- printk(KERN_ERR "i2c_parport: Memory allocation failed. Not attaching.\n");
- return;
- }
- b->i2c = parport_i2c_bus_template;
- b->i2c.data = parport_get_port (port);
- strncpy(b->i2c.name, port->name, 32);
- spin_lock(&bus_list_lock);
- b->next = bus_list;
- bus_list = b;
- spin_unlock(&bus_list_lock);
- i2c_register_bus(&b->i2c);
- if (debug)
- printk(KERN_DEBUG "i2c: attached to %s\n", port->name);
-}
-
-static void i2c_parport_detach(struct parport *port)
-{
- struct parport_i2c_bus *b, *old_b = NULL;
- spin_lock(&bus_list_lock);
- b = bus_list;
- while (b)
- {
- if (b->i2c.data == port)
- {
- if (old_b)
- old_b->next = b->next;
- else
- bus_list = b->next;
- i2c_unregister_bus(&b->i2c);
- kfree(b);
- break;
- }
- old_b = b;
- b = b->next;
- }
- spin_unlock(&bus_list_lock);
- if (debug)
- printk(KERN_DEBUG "i2c: detached from %s\n", port->name);
-}
-
-static struct parport_driver parport_i2c_driver =
-{
- "i2c",
- i2c_parport_attach,
- i2c_parport_detach
-};
-
-#ifdef MODULE
-int init_module(void)
-#else
-int __init i2c_parport_init(void)
-#endif
-{
- printk("I2C: driver for parallel port v0.1 philb@gnu.org\n");
- parport_register_driver(&parport_i2c_driver);
- return 0;
-}
-
-#ifdef MODULE
-MODULE_PARM(debug, "i");
-
-void cleanup_module(void)
-{
- struct parport_i2c_bus *b = bus_list;
- while (b)
- {
- struct parport_i2c_bus *next = b->next;
- i2c_unregister_bus(&b->i2c);
- kfree(b);
- b = next;
- }
- parport_unregister_driver(&parport_i2c_driver);
-}
-#endif
-MODULE_LICENSE("GPL");
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