// SPDX-License-Identifier: GPL-2.0-or-later /* * Wacom Penabled Driver for I2C * * Copyright (c) 2011 - 2013 Tatsunosuke Tobita, Wacom. * */ #include #include #include #include #include #include #include #include /* Bitmasks (for data[3]) */ #define WACOM_TIP_SWITCH BIT(0) #define WACOM_BARREL_SWITCH BIT(1) #define WACOM_ERASER BIT(2) #define WACOM_INVERT BIT(3) #define WACOM_BARREL_SWITCH_2 BIT(4) #define WACOM_IN_PROXIMITY BIT(5) /* Registers */ #define WACOM_COMMAND_LSB 0x04 #define WACOM_COMMAND_MSB 0x00 #define WACOM_DATA_LSB 0x05 #define WACOM_DATA_MSB 0x00 /* Report types */ #define REPORT_FEATURE 0x30 /* Requests / operations */ #define OPCODE_GET_REPORT 0x02 #define WACOM_QUERY_REPORT 3 #define WACOM_QUERY_SIZE 19 struct wacom_features { int x_max; int y_max; int pressure_max; char fw_version; }; struct wacom_i2c { struct i2c_client *client; struct input_dev *input; u8 data[WACOM_QUERY_SIZE]; bool prox; int tool; }; static int wacom_query_device(struct i2c_client *client, struct wacom_features *features) { u8 get_query_data_cmd[] = { WACOM_COMMAND_LSB, WACOM_COMMAND_MSB, REPORT_FEATURE | WACOM_QUERY_REPORT, OPCODE_GET_REPORT, WACOM_DATA_LSB, WACOM_DATA_MSB, }; u8 data[WACOM_QUERY_SIZE]; int ret; struct i2c_msg msgs[] = { /* Request reading of feature ReportID: 3 (Pen Query Data) */ { .addr = client->addr, .flags = 0, .len = sizeof(get_query_data_cmd), .buf = get_query_data_cmd, }, { .addr = client->addr, .flags = I2C_M_RD, .len = sizeof(data), .buf = data, }, }; ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); if (ret < 0) return ret; if (ret != ARRAY_SIZE(msgs)) return -EIO; features->x_max = get_unaligned_le16(&data[3]); features->y_max = get_unaligned_le16(&data[5]); features->pressure_max = get_unaligned_le16(&data[11]); features->fw_version = get_unaligned_le16(&data[13]); dev_dbg(&client->dev, "x_max:%d, y_max:%d, pressure:%d, fw:%d\n", features->x_max, features->y_max, features->pressure_max, features->fw_version); return 0; } static irqreturn_t wacom_i2c_irq(int irq, void *dev_id) { struct wacom_i2c *wac_i2c = dev_id; struct input_dev *input = wac_i2c->input; u8 *data = wac_i2c->data; unsigned int x, y, pressure; unsigned char tsw, f1, f2, ers; int error; error = i2c_master_recv(wac_i2c->client, wac_i2c->data, sizeof(wac_i2c->data)); if (error < 0) goto out; tsw = data[3] & WACOM_TIP_SWITCH; ers = data[3] & WACOM_ERASER; f1 = data[3] & WACOM_BARREL_SWITCH; f2 = data[3] & WACOM_BARREL_SWITCH_2; x = le16_to_cpup((__le16 *)&data[4]); y = le16_to_cpup((__le16 *)&data[6]); pressure = le16_to_cpup((__le16 *)&data[8]); if (!wac_i2c->prox) wac_i2c->tool = (data[3] & (WACOM_ERASER | WACOM_INVERT)) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN; wac_i2c->prox = data[3] & WACOM_IN_PROXIMITY; input_report_key(input, BTN_TOUCH, tsw || ers); input_report_key(input, wac_i2c->tool, wac_i2c->prox); input_report_key(input, BTN_STYLUS, f1); input_report_key(input, BTN_STYLUS2, f2); input_report_abs(input, ABS_X, x); input_report_abs(input, ABS_Y, y); input_report_abs(input, ABS_PRESSURE, pressure); input_sync(input); out: return IRQ_HANDLED; } static int wacom_i2c_open(struct input_dev *dev) { struct wacom_i2c *wac_i2c = input_get_drvdata(dev); struct i2c_client *client = wac_i2c->client; enable_irq(client->irq); return 0; } static void wacom_i2c_close(struct input_dev *dev) { struct wacom_i2c *wac_i2c = input_get_drvdata(dev); struct i2c_client *client = wac_i2c->client; disable_irq(client->irq); } static int wacom_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct wacom_i2c *wac_i2c; struct input_dev *input; struct wacom_features features = { 0 }; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(dev, "i2c_check_functionality error\n"); return -EIO; } error = wacom_query_device(client, &features); if (error) return error; wac_i2c = devm_kzalloc(dev, sizeof(*wac_i2c), GFP_KERNEL); if (!wac_i2c) return -ENOMEM; wac_i2c->client = client; input = devm_input_allocate_device(dev); if (!input) return -ENOMEM; wac_i2c->input = input; input->name = "Wacom I2C Digitizer"; input->id.bustype = BUS_I2C; input->id.vendor = 0x56a; input->id.version = features.fw_version; input->open = wacom_i2c_open; input->close = wacom_i2c_close; input->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); __set_bit(BTN_TOOL_PEN, input->keybit); __set_bit(BTN_TOOL_RUBBER, input->keybit); __set_bit(BTN_STYLUS, input->keybit); __set_bit(BTN_STYLUS2, input->keybit); __set_bit(BTN_TOUCH, input->keybit); input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0); input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0); input_set_abs_params(input, ABS_PRESSURE, 0, features.pressure_max, 0, 0); input_set_drvdata(input, wac_i2c); error = devm_request_threaded_irq(dev, client->irq, NULL, wacom_i2c_irq, IRQF_ONESHOT, "wacom_i2c", wac_i2c); if (error) { dev_err(dev, "Failed to request IRQ: %d\n", error); return error; } /* Disable the IRQ, we'll enable it in wac_i2c_open() */ disable_irq(client->irq); error = input_register_device(wac_i2c->input); if (error) { dev_err(dev, "Failed to register input device: %d\n", error); return error; } return 0; } static int __maybe_unused wacom_i2c_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); disable_irq(client->irq); return 0; } static int __maybe_unused wacom_i2c_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); enable_irq(client->irq); return 0; } static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume); static const struct i2c_device_id wacom_i2c_id[] = { { "WAC_I2C_EMR", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, wacom_i2c_id); static struct i2c_driver wacom_i2c_driver = { .driver = { .name = "wacom_i2c", .pm = &wacom_i2c_pm, }, .probe = wacom_i2c_probe, .id_table = wacom_i2c_id, }; module_i2c_driver(wacom_i2c_driver); MODULE_AUTHOR("Tatsunosuke Tobita "); MODULE_DESCRIPTION("WACOM EMR I2C Driver"); MODULE_LICENSE("GPL");