projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b5527a77 JD |
1 | /* |
| 2 | * i2c-smbus.h - SMBus extensions to the I2C protocol | |
| 3 | * | |
| 7c81c60f | 4 | * Copyright (C) 2010 Jean Delvare <jdelvare@suse.de> |
| b5527a77 JD |
5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License as published by | |
| 8 | * the Free Software Foundation; either version 2 of the License, or | |
| 9 | * (at your option) any later version. | |
| 10 | * | |
| 11 | * This program is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | * GNU General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License | |
| 17 | * along with this program; if not, write to the Free Software | |
| 5694f8a8 JD |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| 19 | * MA 02110-1301 USA. | |
| b5527a77 JD |
20 | */ |
| 21 | ||
| 22 | #ifndef _LINUX_I2C_SMBUS_H | |
| 23 | #define _LINUX_I2C_SMBUS_H | |
| 24 | ||
| 25 | #include <linux/i2c.h> | |
| e456cd37 BT |
26 | #include <linux/spinlock.h> |
| 27 | #include <linux/workqueue.h> | |
| b5527a77 JD |
28 | |
| 29 | ||
| 30 | /** | |
| 31 | * i2c_smbus_alert_setup - platform data for the smbus_alert i2c client | |
| 32 | * @alert_edge_triggered: whether the alert interrupt is edge (1) or level (0) | |
| 33 | * triggered | |
| 34 | * @irq: IRQ number, if the smbus_alert driver should take care of interrupt | |
| 35 | * handling | |
| 36 | * | |
| 37 | * If irq is not specified, the smbus_alert driver doesn't take care of | |
| 38 | * interrupt handling. In that case it is up to the I2C bus driver to either | |
| 39 | * handle the interrupts or to poll for alerts. | |
| 40 | * | |
| 41 | * If irq is specified then it it crucial that alert_edge_triggered is | |
| 42 | * properly set. | |
| 43 | */ | |
| 44 | struct i2c_smbus_alert_setup { | |
| 45 | unsigned int alert_edge_triggered:1; | |
| 46 | int irq; | |
| 47 | }; | |
| 48 | ||
| 49 | struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter, | |
| 50 | struct i2c_smbus_alert_setup *setup); | |
| 51 | int i2c_handle_smbus_alert(struct i2c_client *ara); | |
| 52 | ||
| e456cd37 BT |
53 | /** |
| 54 | * smbus_host_notify - internal structure used by the Host Notify mechanism. | |
| 55 | * @adapter: the I2C adapter associated with this struct | |
| 56 | * @work: worker used to schedule the IRQ in the slave device | |
| 57 | * @lock: spinlock to check if a notification is already pending | |
| 58 | * @pending: flag set when a notification is pending (any new notification will | |
| 59 | * be rejected if pending is true) | |
| 60 | * @payload: the actual payload of the Host Notify event | |
| 61 | * @addr: the address of the slave device which raised the notification | |
| 62 | * | |
| 63 | * This struct needs to be allocated by i2c_setup_smbus_host_notify() and does | |
| 64 | * not need to be freed. Internally, i2c_setup_smbus_host_notify() uses a | |
| 65 | * managed resource to clean this up when the adapter get released. | |
| 66 | */ | |
| 67 | struct smbus_host_notify { | |
| 68 | struct i2c_adapter *adapter; | |
| 69 | struct work_struct work; | |
| 70 | spinlock_t lock; | |
| 71 | bool pending; | |
| 72 | u16 payload; | |
| 73 | u8 addr; | |
| 74 | }; | |
| 75 | ||
| e456cd37 BT |
76 | struct smbus_host_notify *i2c_setup_smbus_host_notify(struct i2c_adapter *adap); |
| 77 | int i2c_handle_smbus_host_notify(struct smbus_host_notify *host_notify, | |
| 78 | unsigned short addr, unsigned int data); | |
| e456cd37 | 79 | |
| b5527a77 | 80 | #endif /* _LINUX_I2C_SMBUS_H */ |