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[RMI Driver] Implement power saving support

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Implement standard values and functions to operate on power control
register. This allow to modify both reporting rate and sleep mode
in order to save power.

Change-Id: I2bdffd4160e10eec488eb5e19de8a2a258ddbb04
Reviewed-on: http://gerrit.rockbox.org/529
Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>
This commit is contained in:
Jean-Louis Biasini 2013-07-29 14:01:37 +03:00 • committed by Amaury Pouly
parent 49bcf35309
commit be72c4f2bf
2 changed files with 42 additions and 0 deletions
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27
firmware/drivers/synaptics-rmi.c
View file

@ -25,6 +25,8 @@
static int rmi_cur_page;
static int rmi_i2c_addr;
static unsigned char dev_ctl_reg;
/* NOTE:
* RMI over i2c supports some special aliases on page 0x2 but this driver don't
* use them */
@ -33,6 +35,7 @@ int rmi_init(int i2c_dev_addr)
{
rmi_i2c_addr = i2c_dev_addr;
rmi_cur_page = 0x4;
dev_ctl_reg = rmi_read_single(RMI_DEVICE_CONTROL);
return 0;
}
@ -75,3 +78,27 @@ int rmi_write_single(int address, unsigned char byte)
{
return rmi_write(address, 1, &byte);
}
/* set the device to the given sleep mode */
void rmi_set_sleep_mode(unsigned char sleep_mode)
{
/* valid value different from the actual one*/
if((dev_ctl_reg & RMI_SLEEP_MODE_BM) != sleep_mode)
{
dev_ctl_reg &= ~RMI_SLEEP_MODE_BM;
dev_ctl_reg |= sleep_mode;
rmi_write_single(RMI_DEVICE_CONTROL, dev_ctl_reg);
}
}
/* set the device's report rate to the given value */
void rmi_set_report_rate(unsigned char report_rate)
{
/* valid value different from the actual one*/
if((dev_ctl_reg & RMI_REPORT_RATE_BM) != report_rate)
{
dev_ctl_reg &= ~RMI_REPORT_RATE_BM;
dev_ctl_reg |= report_rate;
rmi_write_single(RMI_DEVICE_CONTROL, dev_ctl_reg);
}
}

15
firmware/export/synaptics-rmi.h
View file

@ -97,6 +97,17 @@ struct rmi_2d_absolute_data_t
#define RMI_2D_GEST_FLICK_X_BM 0x0f
#define RMI_2D_GEST_FLICK_Y_BM 0xf0
#define RMI_2D_GEST_FLICK_Y_BP 4
/* RMI Device Control register */
#define RMI_REPORT_RATE_BM 0xc0
#define RMI_SLEEP_MODE_BM 0x07
#define RMI_REPORT_RATE_NORMAL 0x80
#define RMI_REPORT_RATE_LOW 0x40
#define RMI_SLEEP_MODE_FORCE_FULLY_AWAKE 0x00
#define RMI_SLEEP_MODE_NORMAL 0x01
#define RMI_SLEEP_MODE_LOW_POWER 0x02
#define RMI_SLEEP_MODE_VERY_LOW_POWER 0x03
#define RMI_SLEEP_MODE_SENSOR_SLEEP 0x04
struct rmi_2d_relative_data_t
{
@ -127,5 +138,9 @@ int rmi_write(int address, int byte_count, const unsigned char *buffer);
/* Write one register
* WARNING: don't cross a page boundary ! */
int rmi_write_single(int address, unsigned char byte);
/* set the device to the given sleep mode */
void rmi_set_sleep_mode(unsigned char sleep_mode);
/* set the device's report rate to the given value */
void rmi_set_report_rate(unsigned char report_rate);
#endif