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HID: rmi: Disable scanning if the device is not a wake source

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Some touchpads are configured with firmware which continues to scan for
fingers at a minimal scan rate even after receiving the HID power sleep
command. This allows a finger touching the touchpad to genrate a wake
event. This patch ensures that scanning is disabled if the touchpad is
not a wake source and ensures scanning is enabled on resume.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Andrew Duggan 2015-07-06 16:48:31 -07:00 committed by Jiri Kosina
parent 67db8a8086
commit 0925636042
1 changed files with 55 additions and 1 deletions
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56
drivers/hid/hid-rmi.c
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@ -33,6 +33,9 @@
#define RMI_READ_DATA_PENDING 1
#define RMI_STARTED 2
#define RMI_SLEEP_NORMAL 0x0
#define RMI_SLEEP_DEEP_SLEEP 0x1
/* device flags */
#define RMI_DEVICE BIT(0)
#define RMI_DEVICE_HAS_PHYS_BUTTONS BIT(1)
@ -126,6 +129,8 @@ struct rmi_data {
unsigned long device_flags;
unsigned long firmware_id;
u8 f01_ctrl0;
};
#define RMI_PAGE(addr) (((addr) >> 8) & 0xff)
@ -532,9 +537,51 @@ static int rmi_event(struct hid_device *hdev, struct hid_field *field,
}
#ifdef CONFIG_PM
static int rmi_set_sleep_mode(struct hid_device *hdev, int sleep_mode)
{
struct rmi_data *data = hid_get_drvdata(hdev);
int ret;
u8 f01_ctrl0;
f01_ctrl0 = (data->f01_ctrl0 & ~0x3) | sleep_mode;
ret = rmi_write(hdev, data->f01.control_base_addr,
&f01_ctrl0);
if (ret) {
hid_err(hdev, "can not write sleep mode\n");
return ret;
}
return 0;
}
static int rmi_suspend(struct hid_device *hdev, pm_message_t message)
{
if (!device_may_wakeup(hdev->dev.parent))
return rmi_set_sleep_mode(hdev, RMI_SLEEP_DEEP_SLEEP);
return 0;
}
static int rmi_post_reset(struct hid_device *hdev)
{
return rmi_set_mode(hdev, RMI_MODE_ATTN_REPORTS);
int ret;
ret = rmi_set_mode(hdev, RMI_MODE_ATTN_REPORTS);
if (ret) {
hid_err(hdev, "can not set rmi mode\n");
return ret;
}
if (!device_may_wakeup(hdev->dev.parent)) {
ret = rmi_set_sleep_mode(hdev, RMI_SLEEP_NORMAL);
if (ret) {
hid_err(hdev, "can not write sleep mode\n");
return ret;
}
}
return ret;
}
static int rmi_post_resume(struct hid_device *hdev)
@ -732,6 +779,12 @@ static int rmi_populate_f01(struct hid_device *hdev)
data->firmware_id += info[2] * 65536;
}
ret = rmi_read(hdev, data->f01.control_base_addr, &data->f01_ctrl0);
if (ret) {
hid_err(hdev, "can not read f01 ctrl0\n");
return ret;
}
return 0;
}
@ -1273,6 +1326,7 @@ static struct hid_driver rmi_driver = {
.input_mapping = rmi_input_mapping,
.input_configured = rmi_input_configured,
#ifdef CONFIG_PM
.suspend = rmi_suspend,
.resume = rmi_post_resume,
.reset_resume = rmi_post_reset,
#endif