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257 lines
5.9 KiB
257 lines
5.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Wacom Penabled Driver for I2C |
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* |
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* Copyright (c) 2011 - 2013 Tatsunosuke Tobita, Wacom. |
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* <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/input.h> |
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#include <linux/i2c.h> |
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#include <linux/slab.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#include <asm/unaligned.h> |
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#define WACOM_CMD_QUERY0 0x04 |
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#define WACOM_CMD_QUERY1 0x00 |
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#define WACOM_CMD_QUERY2 0x33 |
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#define WACOM_CMD_QUERY3 0x02 |
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#define WACOM_CMD_THROW0 0x05 |
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#define WACOM_CMD_THROW1 0x00 |
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#define WACOM_QUERY_SIZE 19 |
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struct wacom_features { |
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int x_max; |
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int y_max; |
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int pressure_max; |
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char fw_version; |
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}; |
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struct wacom_i2c { |
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struct i2c_client *client; |
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struct input_dev *input; |
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u8 data[WACOM_QUERY_SIZE]; |
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bool prox; |
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int tool; |
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}; |
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static int wacom_query_device(struct i2c_client *client, |
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struct wacom_features *features) |
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{ |
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int ret; |
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u8 cmd1[] = { WACOM_CMD_QUERY0, WACOM_CMD_QUERY1, |
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WACOM_CMD_QUERY2, WACOM_CMD_QUERY3 }; |
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u8 cmd2[] = { WACOM_CMD_THROW0, WACOM_CMD_THROW1 }; |
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u8 data[WACOM_QUERY_SIZE]; |
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struct i2c_msg msgs[] = { |
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{ |
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.addr = client->addr, |
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.flags = 0, |
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.len = sizeof(cmd1), |
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.buf = cmd1, |
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}, |
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{ |
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.addr = client->addr, |
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.flags = 0, |
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.len = sizeof(cmd2), |
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.buf = cmd2, |
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}, |
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{ |
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.addr = client->addr, |
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.flags = I2C_M_RD, |
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.len = sizeof(data), |
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.buf = data, |
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}, |
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}; |
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
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if (ret < 0) |
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return ret; |
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if (ret != ARRAY_SIZE(msgs)) |
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return -EIO; |
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features->x_max = get_unaligned_le16(&data[3]); |
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features->y_max = get_unaligned_le16(&data[5]); |
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features->pressure_max = get_unaligned_le16(&data[11]); |
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features->fw_version = get_unaligned_le16(&data[13]); |
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dev_dbg(&client->dev, |
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"x_max:%d, y_max:%d, pressure:%d, fw:%d\n", |
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features->x_max, features->y_max, |
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features->pressure_max, features->fw_version); |
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return 0; |
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} |
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static irqreturn_t wacom_i2c_irq(int irq, void *dev_id) |
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{ |
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struct wacom_i2c *wac_i2c = dev_id; |
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struct input_dev *input = wac_i2c->input; |
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u8 *data = wac_i2c->data; |
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unsigned int x, y, pressure; |
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unsigned char tsw, f1, f2, ers; |
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int error; |
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error = i2c_master_recv(wac_i2c->client, |
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wac_i2c->data, sizeof(wac_i2c->data)); |
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if (error < 0) |
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goto out; |
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tsw = data[3] & 0x01; |
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ers = data[3] & 0x04; |
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f1 = data[3] & 0x02; |
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f2 = data[3] & 0x10; |
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x = le16_to_cpup((__le16 *)&data[4]); |
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y = le16_to_cpup((__le16 *)&data[6]); |
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pressure = le16_to_cpup((__le16 *)&data[8]); |
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if (!wac_i2c->prox) |
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wac_i2c->tool = (data[3] & 0x0c) ? |
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BTN_TOOL_RUBBER : BTN_TOOL_PEN; |
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wac_i2c->prox = data[3] & 0x20; |
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input_report_key(input, BTN_TOUCH, tsw || ers); |
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input_report_key(input, wac_i2c->tool, wac_i2c->prox); |
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input_report_key(input, BTN_STYLUS, f1); |
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input_report_key(input, BTN_STYLUS2, f2); |
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input_report_abs(input, ABS_X, x); |
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input_report_abs(input, ABS_Y, y); |
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input_report_abs(input, ABS_PRESSURE, pressure); |
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input_sync(input); |
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out: |
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return IRQ_HANDLED; |
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} |
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static int wacom_i2c_open(struct input_dev *dev) |
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{ |
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struct wacom_i2c *wac_i2c = input_get_drvdata(dev); |
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struct i2c_client *client = wac_i2c->client; |
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enable_irq(client->irq); |
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return 0; |
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} |
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static void wacom_i2c_close(struct input_dev *dev) |
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{ |
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struct wacom_i2c *wac_i2c = input_get_drvdata(dev); |
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struct i2c_client *client = wac_i2c->client; |
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disable_irq(client->irq); |
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} |
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static int wacom_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct device *dev = &client->dev; |
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struct wacom_i2c *wac_i2c; |
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struct input_dev *input; |
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struct wacom_features features = { 0 }; |
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int error; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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dev_err(dev, "i2c_check_functionality error\n"); |
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return -EIO; |
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} |
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error = wacom_query_device(client, &features); |
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if (error) |
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return error; |
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wac_i2c = devm_kzalloc(dev, sizeof(*wac_i2c), GFP_KERNEL); |
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if (!wac_i2c) |
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return -ENOMEM; |
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wac_i2c->client = client; |
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input = devm_input_allocate_device(dev); |
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if (!input) |
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return -ENOMEM; |
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wac_i2c->input = input; |
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input->name = "Wacom I2C Digitizer"; |
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input->id.bustype = BUS_I2C; |
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input->id.vendor = 0x56a; |
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input->id.version = features.fw_version; |
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input->open = wacom_i2c_open; |
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input->close = wacom_i2c_close; |
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input->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
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__set_bit(BTN_TOOL_PEN, input->keybit); |
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__set_bit(BTN_TOOL_RUBBER, input->keybit); |
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__set_bit(BTN_STYLUS, input->keybit); |
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__set_bit(BTN_STYLUS2, input->keybit); |
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__set_bit(BTN_TOUCH, input->keybit); |
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input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0); |
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input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0); |
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input_set_abs_params(input, ABS_PRESSURE, |
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0, features.pressure_max, 0, 0); |
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input_set_drvdata(input, wac_i2c); |
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error = devm_request_threaded_irq(dev, client->irq, NULL, wacom_i2c_irq, |
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IRQF_ONESHOT, "wacom_i2c", wac_i2c); |
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if (error) { |
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dev_err(dev, "Failed to request IRQ: %d\n", error); |
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return error; |
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} |
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/* Disable the IRQ, we'll enable it in wac_i2c_open() */ |
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disable_irq(client->irq); |
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error = input_register_device(wac_i2c->input); |
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if (error) { |
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dev_err(dev, "Failed to register input device: %d\n", error); |
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return error; |
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} |
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return 0; |
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} |
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static int __maybe_unused wacom_i2c_suspend(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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disable_irq(client->irq); |
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return 0; |
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} |
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static int __maybe_unused wacom_i2c_resume(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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enable_irq(client->irq); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume); |
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static const struct i2c_device_id wacom_i2c_id[] = { |
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{ "WAC_I2C_EMR", 0 }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, wacom_i2c_id); |
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static struct i2c_driver wacom_i2c_driver = { |
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.driver = { |
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.name = "wacom_i2c", |
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.pm = &wacom_i2c_pm, |
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}, |
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.probe = wacom_i2c_probe, |
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.id_table = wacom_i2c_id, |
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}; |
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module_i2c_driver(wacom_i2c_driver); |
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MODULE_AUTHOR("Tatsunosuke Tobita <[email protected]>"); |
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MODULE_DESCRIPTION("WACOM EMR I2C Driver"); |
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MODULE_LICENSE("GPL");
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