diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rmi.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/rmi.h b/include/linux/rmi.h index ac89d1e731dc..e0aca1476001 100644 --- a/include/linux/rmi.h +++ b/include/linux/rmi.h @@ -150,6 +150,55 @@ struct rmi_f01_power_management { }; /** + * struct rmi_device_platform_data_spi - provides parameters used in SPI + * communications. All Synaptics SPI products support a standard SPI + * interface; some also support what is called SPI V2 mode, depending on + * firmware and/or ASIC limitations. In V2 mode, the touch sensor can + * support shorter delays during certain operations, and these are specified + * separately from the standard mode delays. + * + * @block_delay - for standard SPI transactions consisting of both a read and + * write operation, the delay (in microseconds) between the read and write + * operations. + * @split_read_block_delay_us - for V2 SPI transactions consisting of both a + * read and write operation, the delay (in microseconds) between the read and + * write operations. + * @read_delay_us - the delay between each byte of a read operation in normal + * SPI mode. + * @write_delay_us - the delay between each byte of a write operation in normal + * SPI mode. + * @split_read_byte_delay_us - the delay between each byte of a read operation + * in V2 mode. + * @pre_delay_us - the delay before the start of a SPI transaction. This is + * typically useful in conjunction with custom chip select assertions (see + * below). + * @post_delay_us - the delay after the completion of an SPI transaction. This + * is typically useful in conjunction with custom chip select assertions (see + * below). + * @cs_assert - For systems where the SPI subsystem does not control the CS/SSB + * line, or where such control is broken, you can provide a custom routine to + * handle a GPIO as CS/SSB. This routine will be called at the beginning and + * end of each SPI transaction. The RMI SPI implementation will wait + * pre_delay_us after this routine returns before starting the SPI transfer; + * and post_delay_us after completion of the SPI transfer(s) before calling it + * with assert==FALSE. + */ +struct rmi_device_platform_data_spi { + u32 block_delay_us; + u32 split_read_block_delay_us; + u32 read_delay_us; + u32 write_delay_us; + u32 split_read_byte_delay_us; + u32 pre_delay_us; + u32 post_delay_us; + u8 bits_per_word; + u16 mode; + + void *cs_assert_data; + int (*cs_assert)(const void *cs_assert_data, const bool assert); +}; + +/** * struct rmi_device_platform_data - system specific configuration info. * * @reset_delay_ms - after issuing a reset command to the touch sensor, the @@ -159,6 +208,8 @@ struct rmi_f01_power_management { struct rmi_device_platform_data { int reset_delay_ms; + struct rmi_device_platform_data_spi spi_data; + /* function handler pdata */ struct rmi_2d_sensor_platform_data *sensor_pdata; struct rmi_f01_power_management power_management; |