forked from mirrors/linux
a76e7c6821
The parameter passed to pca9665_reset is adap->data (which is bus driver specific), not i2c_algp_pca_data *adap. pca9665_reset expects it to be i2c_algp_pca_data *adap. All other wrappers from the algo call back to the bus driver, which knows to handle its custom data. Only pca9665_reset resides inside the algorithm code and does not know how to handle a custom data structure. This can result in a kernel crash. Fix by re-factoring pca_reset() from a macro to a function handling chip specific code, and only call adap->reset_chip() if the chip is not PCA9665. Signed-off-by: Thomas Kavanagh <tkavanagh@juniper.net> Signed-off-by: Guenter Roeck <groeck@juniper.net> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
#ifndef _LINUX_I2C_ALGO_PCA_H
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#define _LINUX_I2C_ALGO_PCA_H
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/* Chips known to the pca algo */
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#define I2C_PCA_CHIP_9564 0x00
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#define I2C_PCA_CHIP_9665 0x01
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/* Internal period for PCA9665 oscilator */
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#define I2C_PCA_OSC_PER 3 /* e10-8s */
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/* Clock speeds for the bus for PCA9564*/
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#define I2C_PCA_CON_330kHz 0x00
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#define I2C_PCA_CON_288kHz 0x01
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#define I2C_PCA_CON_217kHz 0x02
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#define I2C_PCA_CON_146kHz 0x03
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#define I2C_PCA_CON_88kHz 0x04
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#define I2C_PCA_CON_59kHz 0x05
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#define I2C_PCA_CON_44kHz 0x06
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#define I2C_PCA_CON_36kHz 0x07
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/* PCA9564 registers */
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#define I2C_PCA_STA 0x00 /* STATUS Read Only */
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#define I2C_PCA_TO 0x00 /* TIMEOUT Write Only */
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#define I2C_PCA_DAT 0x01 /* DATA Read/Write */
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#define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */
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#define I2C_PCA_CON 0x03 /* CONTROL Read/Write */
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/* PCA9665 registers */
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#define I2C_PCA_INDPTR 0x00 /* INDIRECT Pointer Write Only */
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#define I2C_PCA_IND 0x02 /* INDIRECT Read/Write */
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/* PCA9665 indirect registers */
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#define I2C_PCA_ICOUNT 0x00 /* Byte Count for buffered mode */
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#define I2C_PCA_IADR 0x01 /* OWN ADR */
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#define I2C_PCA_ISCLL 0x02 /* SCL LOW period */
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#define I2C_PCA_ISCLH 0x03 /* SCL HIGH period */
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#define I2C_PCA_ITO 0x04 /* TIMEOUT */
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#define I2C_PCA_IPRESET 0x05 /* Parallel bus reset */
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#define I2C_PCA_IMODE 0x06 /* I2C Bus mode */
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/* PCA9665 I2C bus mode */
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#define I2C_PCA_MODE_STD 0x00 /* Standard mode */
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#define I2C_PCA_MODE_FAST 0x01 /* Fast mode */
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#define I2C_PCA_MODE_FASTP 0x02 /* Fast Plus mode */
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#define I2C_PCA_MODE_TURBO 0x03 /* Turbo mode */
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#define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */
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#define I2C_PCA_CON_ENSIO 0x40 /* Enable */
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#define I2C_PCA_CON_STA 0x20 /* Start */
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#define I2C_PCA_CON_STO 0x10 /* Stop */
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#define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */
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#define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */
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struct i2c_algo_pca_data {
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void *data; /* private low level data */
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void (*write_byte) (void *data, int reg, int val);
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int (*read_byte) (void *data, int reg);
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int (*wait_for_completion) (void *data);
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void (*reset_chip) (void *data);
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/* For PCA9564, use one of the predefined frequencies:
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* 330000, 288000, 217000, 146000, 88000, 59000, 44000, 36000
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* For PCA9665, use the frequency you want here. */
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unsigned int i2c_clock;
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unsigned int chip;
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};
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int i2c_pca_add_bus(struct i2c_adapter *);
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int i2c_pca_add_numbered_bus(struct i2c_adapter *);
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#endif /* _LINUX_I2C_ALGO_PCA_H */
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