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Subject[PATCH 3/8] Input: elan_i2c - add trackstick report
Date
The Elan touchpads over I2C/SMBus also can handle a
trackstick. Unfortunately, nothing tells us if the
device supports trackstick (the information lies in
the PS/2 node), so rely on a platform data to enable
or not the trackstick node.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1313939

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

---

changes in v2:
- renamed ETP_PT_REPORT_ID into ETP_TP_REPORT_ID (pass-through to track-point)
to stay more in line with the rest
- removed Host Notify support so amended to match parent
---
drivers/input/mouse/elan_i2c.h | 10 ++++
drivers/input/mouse/elan_i2c_core.c | 91 +++++++++++++++++++++++++++++++++++--
2 files changed, 98 insertions(+), 3 deletions(-)

diff --git a/drivers/input/mouse/elan_i2c.h b/drivers/input/mouse/elan_i2c.h
index 599544c1a91c..8f9c97267bc9 100644
--- a/drivers/input/mouse/elan_i2c.h
+++ b/drivers/input/mouse/elan_i2c.h
@@ -87,4 +87,14 @@ struct elan_transport_ops {

extern const struct elan_transport_ops elan_smbus_ops, elan_i2c_ops;

+/**
+ * struct elan_platform_data - system specific configuration info.
+ *
+ * @trackpoint - specify whether or not you want the trackstick input node to
+ * be created and handled by the driver.
+ */
+struct elan_platform_data {
+ bool trackpoint;
+};
+
#endif /* _ELAN_I2C_H */
diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index 75e757520ef0..8ed1e2a8a4dd 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -51,6 +51,7 @@
#define ETP_MAX_FINGERS 5
#define ETP_FINGER_DATA_LEN 5
#define ETP_REPORT_ID 0x5D
+#define ETP_TP_REPORT_ID 0x5E
#define ETP_REPORT_ID_OFFSET 2
#define ETP_TOUCH_INFO_OFFSET 3
#define ETP_FINGER_DATA_OFFSET 4
@@ -61,6 +62,7 @@
struct elan_tp_data {
struct i2c_client *client;
struct input_dev *input;
+ struct input_dev *tp_input; /* trackpoint input node */
struct regulator *vcc;

const struct elan_transport_ops *ops;
@@ -930,6 +932,34 @@ static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
input_sync(input);
}

+static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
+{
+ struct input_dev *input = data->tp_input;
+ u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
+ int x, y;
+
+ if (!data->tp_input) {
+ dev_warn_once(&data->client->dev,
+ "received a trackpoint report while no trackpoint device has been created.\n"
+ "Please report upstream.\n");
+ return;
+ }
+
+ input_report_key(input, BTN_LEFT, packet[0] & 0x01);
+ input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
+ input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
+
+ if ((packet[3] & 0x0F) == 0x06) {
+ x = packet[4] - (int)((packet[1]^0x80) << 1);
+ y = (int)((packet[2]^0x80) << 1) - packet[5];
+
+ input_report_rel(input, REL_X, x);
+ input_report_rel(input, REL_Y, y);
+ }
+
+ input_sync(input);
+}
+
static irqreturn_t elan_isr(int irq, void *dev_id)
{
struct elan_tp_data *data = dev_id;
@@ -951,11 +981,17 @@ static irqreturn_t elan_isr(int irq, void *dev_id)
if (error)
goto out;

- if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
+ switch (report[ETP_REPORT_ID_OFFSET]) {
+ case ETP_REPORT_ID:
+ elan_report_absolute(data, report);
+ break;
+ case ETP_TP_REPORT_ID:
+ elan_report_trackpoint(data, report);
+ break;
+ default:
dev_err(dev, "invalid report id data (%x)\n",
report[ETP_REPORT_ID_OFFSET]);
- else
- elan_report_absolute(data, report);
+ }

out:
return IRQ_HANDLED;
@@ -966,6 +1002,37 @@ static irqreturn_t elan_isr(int irq, void *dev_id)
* Elan initialization functions
******************************************************************
*/
+
+static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
+{
+ struct device *dev = &data->client->dev;
+ struct input_dev *input;
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = "Elan TrackPoint";
+ input->id.bustype = BUS_I2C;
+ input->id.vendor = ELAN_VENDOR_ID;
+ input->id.product = data->product_id;
+ input_set_drvdata(input, data);
+
+ input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+ input->relbit[BIT_WORD(REL_X)] =
+ BIT_MASK(REL_X) | BIT_MASK(REL_Y);
+ input->keybit[BIT_WORD(BTN_LEFT)] =
+ BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
+ BIT_MASK(BTN_RIGHT);
+
+ __set_bit(INPUT_PROP_POINTER, input->propbit);
+ __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
+
+ data->tp_input = input;
+
+ return 0;
+}
+
static int elan_setup_input_device(struct elan_tp_data *data)
{
struct device *dev = &data->client->dev;
@@ -1042,10 +1109,12 @@ static void elan_remove_sysfs_groups(void *_data)
static int elan_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
+ struct elan_platform_data *pdata = dev_get_platdata(&client->dev);
const struct elan_transport_ops *transport_ops;
struct device *dev = &client->dev;
struct elan_tp_data *data;
unsigned long irqflags;
+ bool has_trackpoint = pdata && pdata->trackpoint;
int error;

if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
@@ -1140,6 +1209,12 @@ static int elan_probe(struct i2c_client *client,
if (error)
return error;

+ if (has_trackpoint) {
+ error = elan_setup_trackpoint_input_device(data);
+ if (error)
+ return error;
+ }
+
/*
* Platform code (ACPI, DTS) should normally set up interrupt
* for us, but in case it did not let's fall back to using falling
@@ -1177,6 +1252,16 @@ static int elan_probe(struct i2c_client *client,
return error;
}

+ if (data->tp_input) {
+ error = input_register_device(data->tp_input);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to register TrackPoint input device: %d\n",
+ error);
+ return error;
+ }
+ }
+
/*
* Systems using device tree should set up wakeup via DTS,
* the rest will configure device as wakeup source by default.
--
2.14.3
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