mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 11:03:14 +00:00
c01b083105
The separation between algorithm and adapter was unsharp at places. This was partly hidden by the fact, that the ISA-driver allowed just one instance and had all private data in static variables. This patch makes neccessary preparations to add a platform driver on top of the algorithm, while still supporting ISA. Note: Due to lack of hardware, the ISA-driver could not be tested except that it builds. Concerning the core struct i2c_algo_pca_data: - A private data field was added, all hardware dependant data may go here. Similar to other algorithms, now a pointer to this data is passed to the adapter's functions. In order to make as less changes as possible to the ISA-driver, it leaves the private data empty and still only uses its static variables. - A "reset_chip" function pointer was added; such a functionality must come from the adapter, not the algorithm. - use a variable "i2c_clock" instead of a function pointer "get_clock", allowing for write access to a default in case a wrong value was supplied. In the algorithm-file: - move "i2c-pca-algo.h" into "linux/i2c-algo-pca.h" - now using per_instance timeout values (i2c_adap->timeout) - error messages specify the device, not only the driver name - restructure initialization to easily support "i2c_add_numbered_adapter" - drop "retries" and "own" (i2c address) as they were unused (The state-machine for I2C-communication was not touched.) In the ISA-driver: - adapt to new algorithm Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
#ifndef _LINUX_I2C_ALGO_PCA_H
|
|
#define _LINUX_I2C_ALGO_PCA_H
|
|
|
|
/* Clock speeds for the bus */
|
|
#define I2C_PCA_CON_330kHz 0x00
|
|
#define I2C_PCA_CON_288kHz 0x01
|
|
#define I2C_PCA_CON_217kHz 0x02
|
|
#define I2C_PCA_CON_146kHz 0x03
|
|
#define I2C_PCA_CON_88kHz 0x04
|
|
#define I2C_PCA_CON_59kHz 0x05
|
|
#define I2C_PCA_CON_44kHz 0x06
|
|
#define I2C_PCA_CON_36kHz 0x07
|
|
|
|
/* PCA9564 registers */
|
|
#define I2C_PCA_STA 0x00 /* STATUS Read Only */
|
|
#define I2C_PCA_TO 0x00 /* TIMEOUT Write Only */
|
|
#define I2C_PCA_DAT 0x01 /* DATA Read/Write */
|
|
#define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */
|
|
#define I2C_PCA_CON 0x03 /* CONTROL Read/Write */
|
|
|
|
#define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */
|
|
#define I2C_PCA_CON_ENSIO 0x40 /* Enable */
|
|
#define I2C_PCA_CON_STA 0x20 /* Start */
|
|
#define I2C_PCA_CON_STO 0x10 /* Stop */
|
|
#define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */
|
|
#define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */
|
|
|
|
struct i2c_algo_pca_data {
|
|
void *data; /* private low level data */
|
|
void (*write_byte) (void *data, int reg, int val);
|
|
int (*read_byte) (void *data, int reg);
|
|
int (*wait_for_completion) (void *data);
|
|
void (*reset_chip) (void *data);
|
|
/* i2c_clock values are defined in linux/i2c-algo-pca.h */
|
|
unsigned int i2c_clock;
|
|
};
|
|
|
|
int i2c_pca_add_bus(struct i2c_adapter *);
|
|
int i2c_pca_add_numbered_bus(struct i2c_adapter *);
|
|
|
|
#endif /* _LINUX_I2C_ALGO_PCA_H */
|