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.tissoi...@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
