diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2000-08-28 22:00:09 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2000-08-28 22:00:09 +0000 |
commit | 1a1d77dd589de5a567fa95e36aa6999c704ceca4 (patch) | |
tree | 141e31f89f18b9fe0831f31852e0435ceaccafc5 /drivers/char/i2c-old.c | |
parent | fb9c690a18b3d66925a65b17441c37fa14d4370b (diff) |
Merge with 2.4.0-test7.
Diffstat (limited to 'drivers/char/i2c-old.c')
-rw-r--r-- | drivers/char/i2c-old.c | 458 |
1 files changed, 0 insertions, 458 deletions
diff --git a/drivers/char/i2c-old.c b/drivers/char/i2c-old.c deleted file mode 100644 index bd9750fc3..000000000 --- a/drivers/char/i2c-old.c +++ /dev/null @@ -1,458 +0,0 @@ -/* - * 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/locks.h> -#include <linux/sched.h> -#include <linux/malloc.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_BT848 -extern int i2c_tuner_init(void); -extern int msp3400c_init(void); -#endif -#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_BT848 - i2c_tuner_init(); - msp3400c_init(); -#endif -#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 |