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HID: logitech: Add function to enable HID++ 1.0 "scrolling acceleration"

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"Scrolling acceleration" is a bit of a misnomer: it doesn't deal with
acceleration at all. However, that's the name used in Logitech's spec,
so I used it here.

Signed-off-by: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Harry Cutts 2018-08-30 14:56:20 -07:00 committed by Jiri Kosina
parent 1ff2e1a44e
commit 051dc9b057
1 changed files with 34 additions and 13 deletions
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47
drivers/hid/hid-logitech-hidpp.c
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@ -400,32 +400,53 @@ static void hidpp_prefix_name(char **name, int name_length)
#define HIDPP_SET_LONG_REGISTER 0x82
#define HIDPP_GET_LONG_REGISTER 0x83
#define HIDPP_REG_GENERAL 0x00
static int hidpp10_enable_battery_reporting(struct hidpp_device *hidpp_dev)
/**
* hidpp10_set_register_bit() - Sets a single bit in a HID++ 1.0 register.
* @hidpp_dev: the device to set the register on.
* @register_address: the address of the register to modify.
* @byte: the byte of the register to modify. Should be less than 3.
* Return: 0 if successful, otherwise a negative error code.
*/
static int hidpp10_set_register_bit(struct hidpp_device *hidpp_dev,
u8 register_address, u8 byte, u8 bit)
{
struct hidpp_report response;
int ret;
u8 params[3] = { 0 };
ret = hidpp_send_rap_command_sync(hidpp_dev,
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_REGISTER,
HIDPP_REG_GENERAL,
NULL, 0, &response);
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_REGISTER,
register_address,
NULL, 0, &response);
if (ret)
return ret;
memcpy(params, response.rap.params, 3);
/* Set the battery bit */
params[0] |= BIT(4);
params[byte] |= BIT(bit);
return hidpp_send_rap_command_sync(hidpp_dev,
REPORT_ID_HIDPP_SHORT,
HIDPP_SET_REGISTER,
HIDPP_REG_GENERAL,
params, 3, &response);
REPORT_ID_HIDPP_SHORT,
HIDPP_SET_REGISTER,
register_address,
params, 3, &response);
}
#define HIDPP_REG_GENERAL 0x00
static int hidpp10_enable_battery_reporting(struct hidpp_device *hidpp_dev)
{
return hidpp10_set_register_bit(hidpp_dev, HIDPP_REG_GENERAL, 0, 4);
}
#define HIDPP_REG_FEATURES 0x01
/* On HID++ 1.0 devices, high-res scroll was called "scrolling acceleration". */
static int hidpp10_enable_scrolling_acceleration(struct hidpp_device *hidpp_dev)
{
return hidpp10_set_register_bit(hidpp_dev, HIDPP_REG_FEATURES, 0, 6);
}
#define HIDPP_REG_BATTERY_STATUS 0x07