diff options
Diffstat (limited to 'debian/uncrustify-trinity/uncrustify-trinity-0.78.1/documentation/htdocs/examples/c-1.in.c')
| -rw-r--r-- | debian/uncrustify-trinity/uncrustify-trinity-0.78.1/documentation/htdocs/examples/c-1.in.c | 1234 |
1 files changed, 0 insertions, 1234 deletions
diff --git a/debian/uncrustify-trinity/uncrustify-trinity-0.78.1/documentation/htdocs/examples/c-1.in.c b/debian/uncrustify-trinity/uncrustify-trinity-0.78.1/documentation/htdocs/examples/c-1.in.c deleted file mode 100644 index c1a53476..00000000 --- a/debian/uncrustify-trinity/uncrustify-trinity-0.78.1/documentation/htdocs/examples/c-1.in.c +++ /dev/null @@ -1,1234 +0,0 @@ -/* i2c-core.c - a device driver for the iic-bus interface */ -/* ------------------------------------------------------------------------- */ -/* Copyright (C) 1995-99 Simon G. Vogl - - 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. */ -/* ------------------------------------------------------------------------- */ - -/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>. - All SMBus-related things are written by Frodo Looijaard <frodol@dds.nl> - SMBus 2.0 support by Mark Studebaker <mdsxyz123@yahoo.com> */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/i2c.h> -#include <linux/init.h> -#include <linux/idr.h> -#include <linux/seq_file.h> -#include <asm/uaccess.h> - - -static LIST_HEAD(adapters); -static LIST_HEAD(drivers); -static DECLARE_MUTEX(core_lists); -static DEFINE_IDR(i2c_adapter_idr); - -static int i2c_device_match(struct device *dev, struct device_driver *drv) -{ - return 1; -} - -static int i2c_bus_suspend(struct device * dev, pm_message_t state) -{ - int rc = 0; - - if (dev->driver && dev->driver->suspend) - rc = dev->driver->suspend(dev,state,0); - return rc; -} - -static int i2c_bus_resume(struct device * dev) -{ - int rc = 0; - - if (dev->driver && dev->driver->resume) - rc = dev->driver->resume(dev,0); - return rc; -} - -struct bus_type i2c_bus_type = { - .name = "i2c", - .match = i2c_device_match, - .suspend = i2c_bus_suspend, - .resume = i2c_bus_resume, -}; - -static int i2c_device_probe(struct device *dev) -{ - return -ENODEV; -} - -static int i2c_device_remove(struct device *dev) -{ - return 0; -} - -void i2c_adapter_dev_release(struct device *dev) -{ - struct i2c_adapter *adap = dev_to_i2c_adapter(dev); - complete(&adap->dev_released); -} - -struct device_driver i2c_adapter_driver = { - .name = "i2c_adapter", - .bus = &i2c_bus_type, - .probe = i2c_device_probe, - .remove = i2c_device_remove, -}; - -static void i2c_adapter_class_dev_release(struct class_device *dev) -{ - struct i2c_adapter *adap = class_dev_to_i2c_adapter(dev); - complete(&adap->class_dev_released); -} - -struct class i2c_adapter_class = { - .name = "i2c-adapter", - .release =&i2c_adapter_class_dev_release, -}; - -static ssize_t show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct i2c_adapter *adap = dev_to_i2c_adapter(dev); - return sprintf(buf, "%s\n", adap->name); -} -static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); - - -static void i2c_client_release(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - complete(&client->released); -} - -static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct i2c_client *client = to_i2c_client(dev); - return sprintf(buf, "%s\n", client->name); -} - -/* - * We can't use the DEVICE_ATTR() macro here as we want the same filename for a - * different type of a device. So beware if the DEVICE_ATTR() macro ever - * changes, this definition will also have to change. - */ -static struct device_attribute dev_attr_client_name = { - .attr = {.name = "name", .mode = S_IRUGO, .owner = THIS_MODULE }, - .show = &show_client_name, -}; - - -/* --------------------------------------------------- - * registering functions - * --------------------------------------------------- - */ - -/* ----- - * i2c_add_adapter is called from within the algorithm layer, - * when a new hw adapter registers. A new device is register to be - * available for clients. - */ -int i2c_add_adapter(struct i2c_adapter *adap) -{ - int id, res = 0; - struct list_head *item; - struct i2c_driver *driver; - - down(&core_lists); - - if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) { - res = -ENOMEM; - goto out_unlock; - } - - res = idr_get_new(&i2c_adapter_idr, adap, &id); - if (res < 0) { - if (res == -EAGAIN) - res = -ENOMEM; - goto out_unlock; - } - - adap->nr = id & MAX_ID_MASK; - init_MUTEX(&adap->bus_lock); - init_MUTEX(&adap->clist_lock); - list_add_tail(&adap->list,&adapters); - INIT_LIST_HEAD(&adap->clients); - - /* Add the adapter to the driver core. - * If the parent pointer is not set up, - * we add this adapter to the host bus. - */ - if (adap->dev.parent == NULL) - adap->dev.parent = &platform_bus; - sprintf(adap->dev.bus_id, "i2c-%d", adap->nr); - adap->dev.driver = &i2c_adapter_driver; - adap->dev.release = &i2c_adapter_dev_release; - device_register(&adap->dev); - device_create_file(&adap->dev, &dev_attr_name); - - /* Add this adapter to the i2c_adapter class */ - memset(&adap->class_dev, 0x00, sizeof(struct class_device)); - adap->class_dev.dev = &adap->dev; - adap->class_dev.class = &i2c_adapter_class; - strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE); - class_device_register(&adap->class_dev); - - dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); - - /* inform drivers of new adapters */ - list_for_each(item,&drivers) { - driver = list_entry(item, struct i2c_driver, list); - if (driver->flags & I2C_DF_NOTIFY) - /* We ignore the return code; if it fails, too bad */ - driver->attach_adapter(adap); - } - -out_unlock: - up(&core_lists); - return res; -} - - -int i2c_del_adapter(struct i2c_adapter *adap) -{ - struct list_head *item, *_n; - struct i2c_adapter *adap_from_list; - struct i2c_driver *driver; - struct i2c_client *client; - int res = 0; - - down(&core_lists); - - /* First make sure that this adapter was ever added */ - list_for_each_entry(adap_from_list, &adapters, list) { - if (adap_from_list == adap) - break; - } - if (adap_from_list != adap) { - pr_debug("i2c-core: attempting to delete unregistered " - "adapter [%s]\n", adap->name); - res = -EINVAL; - goto out_unlock; - } - - list_for_each(item,&drivers) { - driver = list_entry(item, struct i2c_driver, list); - if (driver->detach_adapter) - if ((res = driver->detach_adapter(adap))) { - dev_err(&adap->dev, "detach_adapter failed " - "for driver [%s]\n", driver->name); - goto out_unlock; - } - } - - /* detach any active clients. This must be done first, because - * it can fail; in which case we give up. */ - list_for_each_safe(item, _n, &adap->clients) { - client = list_entry(item, struct i2c_client, list); - - /* detaching devices is unconditional of the set notify - * flag, as _all_ clients that reside on the adapter - * must be deleted, as this would cause invalid states. - */ - if ((res=client->driver->detach_client(client))) { - dev_err(&adap->dev, "detach_client failed for client " - "[%s] at address 0x%02x\n", client->name, - client->addr); - goto out_unlock; - } - } - - /* clean up the sysfs representation */ - init_completion(&adap->dev_released); - init_completion(&adap->class_dev_released); - class_device_unregister(&adap->class_dev); - device_remove_file(&adap->dev, &dev_attr_name); - device_unregister(&adap->dev); - list_del(&adap->list); - - /* wait for sysfs to drop all references */ - wait_for_completion(&adap->dev_released); - wait_for_completion(&adap->class_dev_released); - - /* free dynamically allocated bus id */ - idr_remove(&i2c_adapter_idr, adap->nr); - - dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name); - - out_unlock: - up(&core_lists); - return res; -} - - -/* ----- - * What follows is the "upwards" interface: commands for talking to clients, - * which implement the functions to access the physical information of the - * chips. - */ - -int i2c_add_driver(struct i2c_driver *driver) -{ - struct list_head *item; - struct i2c_adapter *adapter; - int res = 0; - - down(&core_lists); - - /* add the driver to the list of i2c drivers in the driver core */ - driver->driver.name = driver->name; - driver->driver.bus = &i2c_bus_type; - driver->driver.probe = i2c_device_probe; - driver->driver.remove = i2c_device_remove; - - res = driver_register(&driver->driver); - if (res) - goto out_unlock; - - list_add_tail(&driver->list,&drivers); - pr_debug("i2c-core: driver [%s] registered\n", driver->name); - - /* now look for instances of driver on our adapters */ - if (driver->flags & I2C_DF_NOTIFY) { - list_for_each(item,&adapters) { - adapter = list_entry(item, struct i2c_adapter, list); - driver->attach_adapter(adapter); - } - } - - out_unlock: - up(&core_lists); - return res; -} - -int i2c_del_driver(struct i2c_driver *driver) -{ - struct list_head *item1, *item2, *_n; - struct i2c_client *client; - struct i2c_adapter *adap; - - int res = 0; - - down(&core_lists); - - /* Have a look at each adapter, if clients of this driver are still - * attached. If so, detach them to be able to kill the driver - * afterwards. - * - * Removing clients does not depend on the notify flag, else - * invalid operation might (will!) result, when using stale client - * pointers. - */ - list_for_each(item1,&adapters) { - adap = list_entry(item1, struct i2c_adapter, list); - if (driver->detach_adapter) { - if ((res = driver->detach_adapter(adap))) { - dev_err(&adap->dev, "detach_adapter failed " - "for driver [%s]\n", driver->name); - goto out_unlock; - } - } else { - list_for_each_safe(item2, _n, &adap->clients) { - client = list_entry(item2, struct i2c_client, list); - if (client->driver != driver) - continue; - dev_dbg(&adap->dev, "detaching client [%s] " - "at 0x%02x\n", client->name, - client->addr); - if ((res = driver->detach_client(client))) { - dev_err(&adap->dev, "detach_client " - "failed for client [%s] at " - "0x%02x\n", client->name, - client->addr); - goto out_unlock; - } - } - } - } - - driver_unregister(&driver->driver); - list_del(&driver->list); - pr_debug("i2c-core: driver [%s] unregistered\n", driver->name); - - out_unlock: - up(&core_lists); - return 0; -} - -static int __i2c_check_addr(struct i2c_adapter *adapter, unsigned int addr) -{ - struct list_head *item; - struct i2c_client *client; - - list_for_each(item,&adapter->clients) { - client = list_entry(item, struct i2c_client, list); - if (client->addr == addr) - return -EBUSY; - } - return 0; -} - -int i2c_check_addr(struct i2c_adapter *adapter, int addr) -{ - int rval; - - down(&adapter->clist_lock); - rval = __i2c_check_addr(adapter, addr); - up(&adapter->clist_lock); - - return rval; -} - -int i2c_attach_client(struct i2c_client *client) -{ - struct i2c_adapter *adapter = client->adapter; - - down(&adapter->clist_lock); - if (__i2c_check_addr(client->adapter, client->addr)) { - up(&adapter->clist_lock); - return -EBUSY; - } - list_add_tail(&client->list,&adapter->clients); - up(&adapter->clist_lock); - - if (adapter->client_register) { - if (adapter->client_register(client)) { - dev_dbg(&adapter->dev, "client_register " - "failed for client [%s] at 0x%02x\n", - client->name, client->addr); - } - } - - if (client->flags & I2C_CLIENT_ALLOW_USE) - client->usage_count = 0; - - client->dev.parent = &client->adapter->dev; - client->dev.driver = &client->driver->driver; - client->dev.bus = &i2c_bus_type; - client->dev.release = &i2c_client_release; - - snprintf(&client->dev.bus_id[0], sizeof(client->dev.bus_id), - "%d-%04x", i2c_adapter_id(adapter), client->addr); - dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n", - client->name, client->dev.bus_id); - device_register(&client->dev); - device_create_file(&client->dev, &dev_attr_client_name); - - return 0; -} - - -int i2c_detach_client(struct i2c_client *client) -{ - struct i2c_adapter *adapter = client->adapter; - int res = 0; - - if ((client->flags & I2C_CLIENT_ALLOW_USE) - && (client->usage_count > 0)) { - dev_warn(&client->dev, "Client [%s] still busy, " - "can't detach\n", client->name); - return -EBUSY; - } - - if (adapter->client_unregister) { - res = adapter->client_unregister(client); - if (res) { - dev_err(&client->dev, - "client_unregister [%s] failed, " - "client not detached\n", client->name); - goto out; - } - } - - down(&adapter->clist_lock); - list_del(&client->list); - init_completion(&client->released); - device_remove_file(&client->dev, &dev_attr_client_name); - device_unregister(&client->dev); - up(&adapter->clist_lock); - wait_for_completion(&client->released); - - out: - return res; -} - -static int i2c_inc_use_client(struct i2c_client *client) -{ - - if (!try_module_get(client->driver->owner)) - return -ENODEV; - if (!try_module_get(client->adapter->owner)) { - module_put(client->driver->owner); - return -ENODEV; - } - - return 0; -} - -static void i2c_dec_use_client(struct i2c_client *client) -{ - module_put(client->driver->owner); - module_put(client->adapter->owner); -} - -int i2c_use_client(struct i2c_client *client) -{ - int ret; - - ret = i2c_inc_use_client(client); - if (ret) - return ret; - - if (client->flags & I2C_CLIENT_ALLOW_USE) { - if (client->flags & I2C_CLIENT_ALLOW_MULTIPLE_USE) - client->usage_count++; - else if (client->usage_count > 0) - goto busy; - else - client->usage_count++; - } - - return 0; - busy: - i2c_dec_use_client(client); - return -EBUSY; -} - -int i2c_release_client(struct i2c_client *client) -{ - if(client->flags & I2C_CLIENT_ALLOW_USE) { - if(client->usage_count>0) - client->usage_count--; - else { - pr_debug("i2c-core: %s used one too many times\n", - __FUNCTION__); - return -EPERM; - } - } - - i2c_dec_use_client(client); - - return 0; -} - -void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg) -{ - struct list_head *item; - struct i2c_client *client; - - down(&adap->clist_lock); - list_for_each(item,&adap->clients) { - client = list_entry(item, struct i2c_client, list); - if (!try_module_get(client->driver->owner)) - continue; - if (NULL != client->driver->command) { - up(&adap->clist_lock); - client->driver->command(client,cmd,arg); - down(&adap->clist_lock); - } - module_put(client->driver->owner); - } - up(&adap->clist_lock); -} - -static int __init i2c_init(void) -{ - int retval; - - retval = bus_register(&i2c_bus_type); - if (retval) - return retval; - retval = driver_register(&i2c_adapter_driver); - if (retval) - return retval; - return class_register(&i2c_adapter_class); -} - -static void __exit i2c_exit(void) -{ - class_unregister(&i2c_adapter_class); - driver_unregister(&i2c_adapter_driver); - bus_unregister(&i2c_bus_type); -} - -subsys_initcall(i2c_init); -module_exit(i2c_exit); - -/* ---------------------------------------------------- - * the functional interface to the i2c busses. - * ---------------------------------------------------- - */ - -int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) -{ - int ret; - - if (adap->algo->master_xfer) { -#ifdef DEBUG - for (ret = 0; ret < num; ret++) { - dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=0x%02x, " - "len=%d\n", ret, msgs[ret].flags & I2C_M_RD ? - 'R' : 'W', msgs[ret].addr, msgs[ret].len); - } -#endif - - down(&adap->bus_lock); - ret = adap->algo->master_xfer(adap,msgs,num); - up(&adap->bus_lock); - - return ret; - } else { - dev_dbg(&adap->dev, "I2C level transfers not supported\n"); - return -ENOSYS; - } -} - -int i2c_master_send(struct i2c_client *client,const char *buf ,int count) -{ - int ret; - struct i2c_adapter *adap=client->adapter; - struct i2c_msg msg; - - msg.addr = client->addr; - msg.flags = client->flags & I2C_M_TEN; - msg.len = count; - msg.buf = (char *)buf; - - ret = i2c_transfer(adap, &msg, 1); - - /* If everything went ok (i.e. 1 msg transmitted), return #bytes - transmitted, else error code. */ - return (ret == 1) ? count : ret; -} - -int i2c_master_recv(struct i2c_client *client, char *buf ,int count) -{ - struct i2c_adapter *adap=client->adapter; - struct i2c_msg msg; - int ret; - - msg.addr = client->addr; - msg.flags = client->flags & I2C_M_TEN; - msg.flags |= I2C_M_RD; - msg.len = count; - msg.buf = buf; - - ret = i2c_transfer(adap, &msg, 1); - - /* If everything went ok (i.e. 1 msg transmitted), return #bytes - transmitted, else error code. */ - return (ret == 1) ? count : ret; -} - - -int i2c_control(struct i2c_client *client, - unsigned int cmd, unsigned long arg) -{ - int ret = 0; - struct i2c_adapter *adap = client->adapter; - - dev_dbg(&client->adapter->dev, "i2c ioctl, cmd: 0x%x, arg: %#lx\n", cmd, arg); - switch (cmd) { - case I2C_RETRIES: - adap->retries = arg; - break; - case I2C_TIMEOUT: - adap->timeout = arg; - break; - default: - if (adap->algo->algo_control!=NULL) - ret = adap->algo->algo_control(adap,cmd,arg); - } - return ret; -} - -/* ---------------------------------------------------- - * the i2c address scanning function - * Will not work for 10-bit addresses! - * ---------------------------------------------------- - */ -static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind, - int (*found_proc) (struct i2c_adapter *, int, int)) -{ - int err; - - /* Make sure the address is valid */ - if (addr < 0x03 || addr > 0x77) { - dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n", - addr); - return -EINVAL; - } - - /* Skip if already in use */ - if (i2c_check_addr(adapter, addr)) - return 0; - - /* Make sure there is something at this address, unless forced */ - if (kind < 0) { - if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, - I2C_SMBUS_QUICK, NULL) < 0) - return 0; - - /* prevent 24RF08 corruption */ - if ((addr & ~0x0f) == 0x50) - i2c_smbus_xfer(adapter, addr, 0, 0, 0, - I2C_SMBUS_QUICK, NULL); - } - - /* Finally call the custom detection function */ - err = found_proc(adapter, addr, kind); - - /* -ENODEV can be returned if there is a chip at the given address - but it isn't supported by this chip driver. We catch it here as - this isn't an error. */ - return (err == -ENODEV) ? 0 : err; -} - -int i2c_probe(struct i2c_adapter *adapter, - struct i2c_client_address_data *address_data, - int (*found_proc) (struct i2c_adapter *, int, int)) -{ - int i, err; - int adap_id = i2c_adapter_id(adapter); - - /* Forget it if we can't probe using SMBUS_QUICK */ - if (! i2c_check_functionality(adapter,I2C_FUNC_SMBUS_QUICK)) - return -1; - - /* Force entries are done first, and are not affected by ignore - entries */ - if (address_data->forces) { - unsigned short **forces = address_data->forces; - int kind; - - for (kind = 0; forces[kind]; kind++) { - for (i = 0; forces[kind][i] != I2C_CLIENT_END; - i += 2) { - if (forces[kind][i] == adap_id - || forces[kind][i] == ANY_I2C_BUS) { - dev_dbg(&adapter->dev, "found force " - "parameter for adapter %d, " - "addr 0x%02x, kind %d\n", - adap_id, forces[kind][i + 1], - kind); - err = i2c_probe_address(adapter, - forces[kind][i + 1], - kind, found_proc); - if (err) - return err; - } - } - } - } - - /* Probe entries are done second, and are not affected by ignore - entries either */ - for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) { - if (address_data->probe[i] == adap_id - || address_data->probe[i] == ANY_I2C_BUS) { - dev_dbg(&adapter->dev, "found probe parameter for " - "adapter %d, addr 0x%02x\n", adap_id, - address_data->probe[i + 1]); - err = i2c_probe_address(adapter, - address_data->probe[i + 1], - -1, found_proc); - if (err) - return err; - } - } - - /* Normal entries are done last, unless shadowed by an ignore entry */ - for (i = 0; address_data->normal_i2c[i] != I2C_CLIENT_END; i += 1) { - int j, ignore; - - ignore = 0; - for (j = 0; address_data->ignore[j] != I2C_CLIENT_END; - j += 2) { - if ((address_data->ignore[j] == adap_id || - address_data->ignore[j] == ANY_I2C_BUS) - && address_data->ignore[j + 1] - == address_data->normal_i2c[i]) { - dev_dbg(&adapter->dev, "found ignore " - "parameter for adapter %d, " - "addr 0x%02x\n", adap_id, - address_data->ignore[j + 1]); - } - ignore = 1; - break; - } - if (ignore) - continue; - - dev_dbg(&adapter->dev, "found normal entry for adapter %d, " - "addr 0x%02x\n", adap_id, - address_data->normal_i2c[i]); - err = i2c_probe_address(adapter, address_data->normal_i2c[i], - -1, found_proc); - if (err) - return err; - } - - return 0; -} - -struct i2c_adapter* i2c_get_adapter(int id) -{ - struct i2c_adapter *adapter; - - down(&core_lists); - adapter = (struct i2c_adapter *)idr_find(&i2c_adapter_idr, id); - if (adapter && !try_module_get(adapter->owner)) - adapter = NULL; - - up(&core_lists); - return adapter; -} - -void i2c_put_adapter(struct i2c_adapter *adap) -{ - module_put(adap->owner); -} - -/* The SMBus parts */ - -#define POLY (0x1070U << 3) -static u8 -crc8(u16 data) -{ - int i; - - for(i = 0; i < 8; i++) { - if (data & 0x8000) - data = data ^ POLY; - data = data << 1; - } - return (u8)(data >> 8); -} - -/* CRC over count bytes in the first array plus the bytes in the rest - array if it is non-null. rest[0] is the (length of rest) - 1 - and is included. */ -static u8 i2c_smbus_partial_pec(u8 crc, int count, u8 *first, u8 *rest) -{ - int i; - - for(i = 0; i < count; i++) - crc = crc8((crc ^ first[i]) << 8); - if(rest != NULL) - for(i = 0; i <= rest[0]; i++) - crc = crc8((crc ^ rest[i]) << 8); - return crc; -} - -static u8 i2c_smbus_pec(int count, u8 *first, u8 *rest) -{ - return i2c_smbus_partial_pec(0, count, first, rest); -} - -/* Returns new "size" (transaction type) - Note that we convert byte to byte_data and byte_data to word_data - rather than invent new xxx_PEC transactions. */ -static int i2c_smbus_add_pec(u16 addr, u8 command, int size, - union i2c_smbus_data *data) -{ - u8 buf[3]; - - buf[0] = addr << 1; - buf[1] = command; - switch(size) { - case I2C_SMBUS_BYTE: - data->byte = i2c_smbus_pec(2, buf, NULL); - size = I2C_SMBUS_BYTE_DATA; - break; - case I2C_SMBUS_BYTE_DATA: - buf[2] = data->byte; - data->word = buf[2] || - (i2c_smbus_pec(3, buf, NULL) << 8); - size = I2C_SMBUS_WORD_DATA; - break; - case I2C_SMBUS_WORD_DATA: - /* unsupported */ - break; - case I2C_SMBUS_BLOCK_DATA: - data->block[data->block[0] + 1] = - i2c_smbus_pec(2, buf, data->block); - size = I2C_SMBUS_BLOCK_DATA_PEC; - break; - } - return size; -} - -static int i2c_smbus_check_pec(u16 addr, u8 command, int size, u8 partial, - union i2c_smbus_data *data) -{ - u8 buf[3], rpec, cpec; - - buf[1] = command; - switch(size) { - case I2C_SMBUS_BYTE_DATA: - buf[0] = (addr << 1) | 1; - cpec = i2c_smbus_pec(2, buf, NULL); - rpec = data->byte; - break; - case I2C_SMBUS_WORD_DATA: - buf[0] = (addr << 1) | 1; - buf[2] = data->word & 0xff; - cpec = i2c_smbus_pec(3, buf, NULL); - rpec = data->word >> 8; - break; - case I2C_SMBUS_WORD_DATA_PEC: - /* unsupported */ - cpec = rpec = 0; - break; - case I2C_SMBUS_PROC_CALL_PEC: - /* unsupported */ - cpec = rpec = 0; - break; - case I2C_SMBUS_BLOCK_DATA_PEC: - buf[0] = (addr << 1); - buf[2] = (addr << 1) | 1; - cpec = i2c_smbus_pec(3, buf, data->block); - rpec = data->block[data->block[0] + 1]; - break; - case I2C_SMBUS_BLOCK_PROC_CALL_PEC: - buf[0] = (addr << 1) | 1; - rpec = i2c_smbus_partial_pec(partial, 1, - buf, data->block); - cpec = data->block[data->block[0] + 1]; - break; - default: - cpec = rpec = 0; - break; - } - if (rpec != cpec) { - pr_debug("i2c-core: Bad PEC 0x%02x vs. 0x%02x\n", - rpec, cpec); - return -1; - } - return 0; -} - -s32 i2c_smbus_write_quick(struct i2c_client *client, u8 value) -{ - return i2c_smbus_xfer(client->adapter,client->addr,client->flags, - value,0,I2C_SMBUS_QUICK,NULL); -} - -s32 i2c_smbus_read_byte(struct i2c_client *client) -{ - union i2c_smbus_data data; - if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_READ,0,I2C_SMBUS_BYTE, &data)) - return -1; - else - return 0x0FF & data.byte; -} - -s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value) -{ - union i2c_smbus_data data; /* only for PEC */ - return i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_WRITE,value, I2C_SMBUS_BYTE,&data); -} - -s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command) -{ - union i2c_smbus_data data; - if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_READ,command, I2C_SMBUS_BYTE_DATA,&data)) - return -1; - else - return 0x0FF & data.byte; -} - -s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value) -{ - union i2c_smbus_data data; - data.byte = value; - return i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_WRITE,command, - I2C_SMBUS_BYTE_DATA,&data); -} - -s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command) -{ - union i2c_smbus_data data; - if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_READ,command, I2C_SMBUS_WORD_DATA, &data)) - return -1; - else - return 0x0FFFF & data.word; -} - -s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value) -{ - union i2c_smbus_data data; - data.word = value; - return i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_WRITE,command, - I2C_SMBUS_WORD_DATA,&data); -} - -s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command, - u8 length, u8 *values) -{ - union i2c_smbus_data data; - int i; - if (length > I2C_SMBUS_BLOCK_MAX) - length = I2C_SMBUS_BLOCK_MAX; - for (i = 1; i <= length; i++) - data.block[i] = values[i-1]; - data.block[0] = length; - return i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_WRITE,command, - I2C_SMBUS_BLOCK_DATA,&data); -} - -/* Returns the number of read bytes */ -s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *values) -{ - union i2c_smbus_data data; - int i; - if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, - I2C_SMBUS_READ,command, - I2C_SMBUS_I2C_BLOCK_DATA,&data)) - return -1; - else { - for (i = 1; i <= data.block[0]; i++) - values[i-1] = data.block[i]; - return data.block[0]; - } -} - -/* Simulate a SMBus command using the i2c protocol - No checking of parameters is done! */ -static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, - unsigned short flags, - char read_write, u8 command, int size, - union i2c_smbus_data * data) -{ - /* So we need to generate a series of msgs. In the case of writing, we - need to use only one message; when reading, we need two. We initialize - most things with sane defaults, to keep the code below somewhat - simpler. */ - unsigned char msgbuf0[34]; - unsigned char msgbuf1[34]; - int num = read_write == I2C_SMBUS_READ?2:1; - struct i2c_msg msg[2] = { { addr, flags, 1, msgbuf0 }, - { addr, flags | I2C_M_RD, 0, msgbuf1 } - }; - int i; - - msgbuf0[0] = command; - switch(size) { - case I2C_SMBUS_QUICK: - msg[0].len = 0; - /* Special case: The read/write field is used as data */ - msg[0].flags = flags | (read_write==I2C_SMBUS_READ)?I2C_M_RD:0; - num = 1; - break; - case I2C_SMBUS_BYTE: - if (read_write == I2C_SMBUS_READ) { - /* Special case: only a read! */ - msg[0].flags = I2C_M_RD | flags; - num = 1; - } - break; - case I2C_SMBUS_BYTE_DATA: - if (read_write == I2C_SMBUS_READ) - msg[1].len = 1; - else { - msg[0].len = 2; - msgbuf0[1] = data->byte; - } - break; - case I2C_SMBUS_WORD_DATA: - if (read_write == I2C_SMBUS_READ) - msg[1].len = 2; - else { - msg[0].len=3; - msgbuf0[1] = data->word & 0xff; - msgbuf0[2] = (data->word >> 8) & 0xff; - } - break; - case I2C_SMBUS_PROC_CALL: - num = 2; /* Special case */ - read_write = I2C_SMBUS_READ; - msg[0].len = 3; - msg[1].len = 2; - msgbuf0[1] = data->word & 0xff; - msgbuf0[2] = (data->word >> 8) & 0xff; - break; - case I2C_SMBUS_BLOCK_DATA: - case I2C_SMBUS_BLOCK_DATA_PEC: - if (read_write == I2C_SMBUS_READ) { - dev_err(&adapter->dev, "Block read not supported " - "under I2C emulation!\n"); - return -1; - } else { - msg[0].len = data->block[0] + 2; - if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) { - dev_err(&adapter->dev, "smbus_access called with " - "invalid block write size (%d)\n", - data->block[0]); - return -1; - } - if(size == I2C_SMBUS_BLOCK_DATA_PEC) - (msg[0].len)++; - for (i = 1; i <= msg[0].len; i++) - msgbuf0[i] = data->block[i-1]; - } - break; - case I2C_SMBUS_BLOCK_PROC_CALL: - case I2C_SMBUS_BLOCK_PROC_CALL_PEC: - dev_dbg(&adapter->dev, "Block process call not supported " - "under I2C emulation!\n"); - return -1; - case I2C_SMBUS_I2C_BLOCK_DATA: - if (read_write == I2C_SMBUS_READ) { - msg[1].len = I2C_SMBUS_I2C_BLOCK_MAX; - } else { - msg[0].len = data->block[0] + 1; - if (msg[0].len > I2C_SMBUS_I2C_BLOCK_MAX + 1) { - dev_err(&adapter->dev, "i2c_smbus_xfer_emulated called with " - "invalid block write size (%d)\n", - data->block[0]); - return -1; - } - for (i = 1; i <= data->block[0]; i++) - msgbuf0[i] = data->block[i]; - } - break; - default: - dev_err(&adapter->dev, "smbus_access called with invalid size (%d)\n", - size); - return -1; - } - - if (i2c_transfer(adapter, msg, num) < 0) - return -1; - - if (read_write == I2C_SMBUS_READ) - switch(size) { - case I2C_SMBUS_BYTE: - data->byte = msgbuf0[0]; - break; - case I2C_SMBUS_BYTE_DATA: - data->byte = msgbuf1[0]; - break; - case I2C_SMBUS_WORD_DATA: - case I2C_SMBUS_PROC_CALL: - data->word = msgbuf1[0] | (msgbuf1[1] << 8); - break; - case I2C_SMBUS_I2C_BLOCK_DATA: - /* fixed at 32 for now */ - data->block[0] = I2C_SMBUS_I2C_BLOCK_MAX; - for (i = 0; i < I2C_SMBUS_I2C_BLOCK_MAX; i++) - data->block[i+1] = msgbuf1[i]; - break; - } - return 0; -} - - -s32 i2c_smbus_xfer(struct i2c_adapter * adapter, u16 addr, unsigned short flags, - char read_write, u8 command, int size, - union i2c_smbus_data * data) -{ - s32 res; - int swpec = 0; - u8 partial = 0; - - flags &= I2C_M_TEN | I2C_CLIENT_PEC; - if((flags & I2C_CLIENT_PEC) && - !(i2c_check_functionality(adapter, I2C_FUNC_SMBUS_HWPEC_CALC))) { - swpec = 1; - if(read_write == I2C_SMBUS_READ && - size == I2C_SMBUS_BLOCK_DATA) - size = I2C_SMBUS_BLOCK_DATA_PEC; - else if(size == I2C_SMBUS_PROC_CALL) - size = I2C_SMBUS_PROC_CALL_PEC; - else if(size == I2C_SMBUS_BLOCK_PROC_CALL) { - i2c_smbus_add_pec(addr, command, - I2C_SMBUS_BLOCK_DATA, data); - partial = data->block[data->block[0] + 1]; - size = I2C_SMBUS_BLOCK_PROC_CALL_PEC; - } else if(read_write == I2C_SMBUS_WRITE && - size != I2C_SMBUS_QUICK && - size != I2C_SMBUS_I2C_BLOCK_DATA) - size = i2c_smbus_add_pec(addr, command, size, data); - } - - if (adapter->algo->smbus_xfer) { - down(&adapter->bus_lock); - res = adapter->algo->smbus_xfer(adapter,addr,flags,read_write, - command,size,data); - up(&adapter->bus_lock); - } else - res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write, - command,size,data); - - if(res >= 0 && swpec && - size != I2C_SMBUS_QUICK && size != I2C_SMBUS_I2C_BLOCK_DATA && - (read_write == I2C_SMBUS_READ || size == I2C_SMBUS_PROC_CALL_PEC || - size == I2C_SMBUS_BLOCK_PROC_CALL_PEC)) { - if(i2c_smbus_check_pec(addr, command, size, partial, data)) - return -1; - } - return res; -} - - -/* Next four are needed by i2c-isa */ -EXPORT_SYMBOL_GPL(i2c_adapter_dev_release); -EXPORT_SYMBOL_GPL(i2c_adapter_driver); -EXPORT_SYMBOL_GPL(i2c_adapter_class); -EXPORT_SYMBOL_GPL(i2c_bus_type); - -EXPORT_SYMBOL(i2c_add_adapter); -EXPORT_SYMBOL(i2c_del_adapter); -EXPORT_SYMBOL(i2c_add_driver); -EXPORT_SYMBOL(i2c_del_driver); -EXPORT_SYMBOL(i2c_attach_client); -EXPORT_SYMBOL(i2c_detach_client); -EXPORT_SYMBOL(i2c_use_client); -EXPORT_SYMBOL(i2c_release_client); -EXPORT_SYMBOL(i2c_clients_command); -EXPORT_SYMBOL(i2c_check_addr); - -EXPORT_SYMBOL(i2c_master_send); -EXPORT_SYMBOL(i2c_master_recv); -EXPORT_SYMBOL(i2c_control); -EXPORT_SYMBOL(i2c_transfer); -EXPORT_SYMBOL(i2c_get_adapter); -EXPORT_SYMBOL(i2c_put_adapter); -EXPORT_SYMBOL(i2c_probe); - -EXPORT_SYMBOL(i2c_smbus_xfer); -EXPORT_SYMBOL(i2c_smbus_write_quick); -EXPORT_SYMBOL(i2c_smbus_read_byte); -EXPORT_SYMBOL(i2c_smbus_write_byte); -EXPORT_SYMBOL(i2c_smbus_read_byte_data); -EXPORT_SYMBOL(i2c_smbus_write_byte_data); -EXPORT_SYMBOL(i2c_smbus_read_word_data); -EXPORT_SYMBOL(i2c_smbus_write_word_data); -EXPORT_SYMBOL(i2c_smbus_write_block_data); -EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data); - -MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); -MODULE_DESCRIPTION("I2C-Bus main module"); -MODULE_LICENSE("GPL"); |