Loading...
1/*
2 * Wacom Penabled Driver for I2C
3 *
4 * Copyright (c) 2011 - 2013 Tatsunosuke Tobita, Wacom.
5 * <tobita.tatsunosuke@wacom.co.jp>
6 *
7 * This program is free software; you can redistribute it
8 * and/or modify it under the terms of the GNU General
9 * Public License as published by the Free Software
10 * Foundation; either version of 2 of the License,
11 * or (at your option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/i2c.h>
17#include <linux/slab.h>
18#include <linux/irq.h>
19#include <linux/interrupt.h>
20#include <linux/gpio.h>
21#include <asm/unaligned.h>
22
23#define WACOM_CMD_QUERY0 0x04
24#define WACOM_CMD_QUERY1 0x00
25#define WACOM_CMD_QUERY2 0x33
26#define WACOM_CMD_QUERY3 0x02
27#define WACOM_CMD_THROW0 0x05
28#define WACOM_CMD_THROW1 0x00
29#define WACOM_QUERY_SIZE 19
30
31struct wacom_features {
32 int x_max;
33 int y_max;
34 int pressure_max;
35 char fw_version;
36};
37
38struct wacom_i2c {
39 struct i2c_client *client;
40 struct input_dev *input;
41 u8 data[WACOM_QUERY_SIZE];
42 bool prox;
43 int tool;
44};
45
46static int wacom_query_device(struct i2c_client *client,
47 struct wacom_features *features)
48{
49 int ret;
50 u8 cmd1[] = { WACOM_CMD_QUERY0, WACOM_CMD_QUERY1,
51 WACOM_CMD_QUERY2, WACOM_CMD_QUERY3 };
52 u8 cmd2[] = { WACOM_CMD_THROW0, WACOM_CMD_THROW1 };
53 u8 data[WACOM_QUERY_SIZE];
54 struct i2c_msg msgs[] = {
55 {
56 .addr = client->addr,
57 .flags = 0,
58 .len = sizeof(cmd1),
59 .buf = cmd1,
60 },
61 {
62 .addr = client->addr,
63 .flags = 0,
64 .len = sizeof(cmd2),
65 .buf = cmd2,
66 },
67 {
68 .addr = client->addr,
69 .flags = I2C_M_RD,
70 .len = sizeof(data),
71 .buf = data,
72 },
73 };
74
75 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
76 if (ret < 0)
77 return ret;
78 if (ret != ARRAY_SIZE(msgs))
79 return -EIO;
80
81 features->x_max = get_unaligned_le16(&data[3]);
82 features->y_max = get_unaligned_le16(&data[5]);
83 features->pressure_max = get_unaligned_le16(&data[11]);
84 features->fw_version = get_unaligned_le16(&data[13]);
85
86 dev_dbg(&client->dev,
87 "x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
88 features->x_max, features->y_max,
89 features->pressure_max, features->fw_version);
90
91 return 0;
92}
93
94static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
95{
96 struct wacom_i2c *wac_i2c = dev_id;
97 struct input_dev *input = wac_i2c->input;
98 u8 *data = wac_i2c->data;
99 unsigned int x, y, pressure;
100 unsigned char tsw, f1, f2, ers;
101 int error;
102
103 error = i2c_master_recv(wac_i2c->client,
104 wac_i2c->data, sizeof(wac_i2c->data));
105 if (error < 0)
106 goto out;
107
108 tsw = data[3] & 0x01;
109 ers = data[3] & 0x04;
110 f1 = data[3] & 0x02;
111 f2 = data[3] & 0x10;
112 x = le16_to_cpup((__le16 *)&data[4]);
113 y = le16_to_cpup((__le16 *)&data[6]);
114 pressure = le16_to_cpup((__le16 *)&data[8]);
115
116 if (!wac_i2c->prox)
117 wac_i2c->tool = (data[3] & 0x0c) ?
118 BTN_TOOL_RUBBER : BTN_TOOL_PEN;
119
120 wac_i2c->prox = data[3] & 0x20;
121
122 input_report_key(input, BTN_TOUCH, tsw || ers);
123 input_report_key(input, wac_i2c->tool, wac_i2c->prox);
124 input_report_key(input, BTN_STYLUS, f1);
125 input_report_key(input, BTN_STYLUS2, f2);
126 input_report_abs(input, ABS_X, x);
127 input_report_abs(input, ABS_Y, y);
128 input_report_abs(input, ABS_PRESSURE, pressure);
129 input_sync(input);
130
131out:
132 return IRQ_HANDLED;
133}
134
135static int wacom_i2c_open(struct input_dev *dev)
136{
137 struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
138 struct i2c_client *client = wac_i2c->client;
139
140 enable_irq(client->irq);
141
142 return 0;
143}
144
145static void wacom_i2c_close(struct input_dev *dev)
146{
147 struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
148 struct i2c_client *client = wac_i2c->client;
149
150 disable_irq(client->irq);
151}
152
153static int wacom_i2c_probe(struct i2c_client *client,
154 const struct i2c_device_id *id)
155{
156 struct wacom_i2c *wac_i2c;
157 struct input_dev *input;
158 struct wacom_features features = { 0 };
159 int error;
160
161 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
162 dev_err(&client->dev, "i2c_check_functionality error\n");
163 return -EIO;
164 }
165
166 error = wacom_query_device(client, &features);
167 if (error)
168 return error;
169
170 wac_i2c = kzalloc(sizeof(*wac_i2c), GFP_KERNEL);
171 input = input_allocate_device();
172 if (!wac_i2c || !input) {
173 error = -ENOMEM;
174 goto err_free_mem;
175 }
176
177 wac_i2c->client = client;
178 wac_i2c->input = input;
179
180 input->name = "Wacom I2C Digitizer";
181 input->id.bustype = BUS_I2C;
182 input->id.vendor = 0x56a;
183 input->id.version = features.fw_version;
184 input->dev.parent = &client->dev;
185 input->open = wacom_i2c_open;
186 input->close = wacom_i2c_close;
187
188 input->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
189
190 __set_bit(BTN_TOOL_PEN, input->keybit);
191 __set_bit(BTN_TOOL_RUBBER, input->keybit);
192 __set_bit(BTN_STYLUS, input->keybit);
193 __set_bit(BTN_STYLUS2, input->keybit);
194 __set_bit(BTN_TOUCH, input->keybit);
195
196 input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0);
197 input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0);
198 input_set_abs_params(input, ABS_PRESSURE,
199 0, features.pressure_max, 0, 0);
200
201 input_set_drvdata(input, wac_i2c);
202
203 error = request_threaded_irq(client->irq, NULL, wacom_i2c_irq,
204 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
205 "wacom_i2c", wac_i2c);
206 if (error) {
207 dev_err(&client->dev,
208 "Failed to enable IRQ, error: %d\n", error);
209 goto err_free_mem;
210 }
211
212 /* Disable the IRQ, we'll enable it in wac_i2c_open() */
213 disable_irq(client->irq);
214
215 error = input_register_device(wac_i2c->input);
216 if (error) {
217 dev_err(&client->dev,
218 "Failed to register input device, error: %d\n", error);
219 goto err_free_irq;
220 }
221
222 i2c_set_clientdata(client, wac_i2c);
223 return 0;
224
225err_free_irq:
226 free_irq(client->irq, wac_i2c);
227err_free_mem:
228 input_free_device(input);
229 kfree(wac_i2c);
230
231 return error;
232}
233
234static int wacom_i2c_remove(struct i2c_client *client)
235{
236 struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
237
238 free_irq(client->irq, wac_i2c);
239 input_unregister_device(wac_i2c->input);
240 kfree(wac_i2c);
241
242 return 0;
243}
244
245#ifdef CONFIG_PM_SLEEP
246static int wacom_i2c_suspend(struct device *dev)
247{
248 struct i2c_client *client = to_i2c_client(dev);
249
250 disable_irq(client->irq);
251
252 return 0;
253}
254
255static int wacom_i2c_resume(struct device *dev)
256{
257 struct i2c_client *client = to_i2c_client(dev);
258
259 enable_irq(client->irq);
260
261 return 0;
262}
263#endif
264
265static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume);
266
267static const struct i2c_device_id wacom_i2c_id[] = {
268 { "WAC_I2C_EMR", 0 },
269 { },
270};
271MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
272
273static struct i2c_driver wacom_i2c_driver = {
274 .driver = {
275 .name = "wacom_i2c",
276 .owner = THIS_MODULE,
277 .pm = &wacom_i2c_pm,
278 },
279
280 .probe = wacom_i2c_probe,
281 .remove = wacom_i2c_remove,
282 .id_table = wacom_i2c_id,
283};
284module_i2c_driver(wacom_i2c_driver);
285
286MODULE_AUTHOR("Tatsunosuke Tobita <tobita.tatsunosuke@wacom.co.jp>");
287MODULE_DESCRIPTION("WACOM EMR I2C Driver");
288MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Wacom Penabled Driver for I2C
4 *
5 * Copyright (c) 2011 - 2013 Tatsunosuke Tobita, Wacom.
6 * <tobita.tatsunosuke@wacom.co.jp>
7 */
8
9#include <linux/module.h>
10#include <linux/input.h>
11#include <linux/i2c.h>
12#include <linux/slab.h>
13#include <linux/irq.h>
14#include <linux/interrupt.h>
15#include <linux/gpio.h>
16#include <asm/unaligned.h>
17
18#define WACOM_CMD_QUERY0 0x04
19#define WACOM_CMD_QUERY1 0x00
20#define WACOM_CMD_QUERY2 0x33
21#define WACOM_CMD_QUERY3 0x02
22#define WACOM_CMD_THROW0 0x05
23#define WACOM_CMD_THROW1 0x00
24#define WACOM_QUERY_SIZE 19
25
26struct wacom_features {
27 int x_max;
28 int y_max;
29 int pressure_max;
30 char fw_version;
31};
32
33struct wacom_i2c {
34 struct i2c_client *client;
35 struct input_dev *input;
36 u8 data[WACOM_QUERY_SIZE];
37 bool prox;
38 int tool;
39};
40
41static int wacom_query_device(struct i2c_client *client,
42 struct wacom_features *features)
43{
44 int ret;
45 u8 cmd1[] = { WACOM_CMD_QUERY0, WACOM_CMD_QUERY1,
46 WACOM_CMD_QUERY2, WACOM_CMD_QUERY3 };
47 u8 cmd2[] = { WACOM_CMD_THROW0, WACOM_CMD_THROW1 };
48 u8 data[WACOM_QUERY_SIZE];
49 struct i2c_msg msgs[] = {
50 {
51 .addr = client->addr,
52 .flags = 0,
53 .len = sizeof(cmd1),
54 .buf = cmd1,
55 },
56 {
57 .addr = client->addr,
58 .flags = 0,
59 .len = sizeof(cmd2),
60 .buf = cmd2,
61 },
62 {
63 .addr = client->addr,
64 .flags = I2C_M_RD,
65 .len = sizeof(data),
66 .buf = data,
67 },
68 };
69
70 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
71 if (ret < 0)
72 return ret;
73 if (ret != ARRAY_SIZE(msgs))
74 return -EIO;
75
76 features->x_max = get_unaligned_le16(&data[3]);
77 features->y_max = get_unaligned_le16(&data[5]);
78 features->pressure_max = get_unaligned_le16(&data[11]);
79 features->fw_version = get_unaligned_le16(&data[13]);
80
81 dev_dbg(&client->dev,
82 "x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
83 features->x_max, features->y_max,
84 features->pressure_max, features->fw_version);
85
86 return 0;
87}
88
89static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
90{
91 struct wacom_i2c *wac_i2c = dev_id;
92 struct input_dev *input = wac_i2c->input;
93 u8 *data = wac_i2c->data;
94 unsigned int x, y, pressure;
95 unsigned char tsw, f1, f2, ers;
96 int error;
97
98 error = i2c_master_recv(wac_i2c->client,
99 wac_i2c->data, sizeof(wac_i2c->data));
100 if (error < 0)
101 goto out;
102
103 tsw = data[3] & 0x01;
104 ers = data[3] & 0x04;
105 f1 = data[3] & 0x02;
106 f2 = data[3] & 0x10;
107 x = le16_to_cpup((__le16 *)&data[4]);
108 y = le16_to_cpup((__le16 *)&data[6]);
109 pressure = le16_to_cpup((__le16 *)&data[8]);
110
111 if (!wac_i2c->prox)
112 wac_i2c->tool = (data[3] & 0x0c) ?
113 BTN_TOOL_RUBBER : BTN_TOOL_PEN;
114
115 wac_i2c->prox = data[3] & 0x20;
116
117 input_report_key(input, BTN_TOUCH, tsw || ers);
118 input_report_key(input, wac_i2c->tool, wac_i2c->prox);
119 input_report_key(input, BTN_STYLUS, f1);
120 input_report_key(input, BTN_STYLUS2, f2);
121 input_report_abs(input, ABS_X, x);
122 input_report_abs(input, ABS_Y, y);
123 input_report_abs(input, ABS_PRESSURE, pressure);
124 input_sync(input);
125
126out:
127 return IRQ_HANDLED;
128}
129
130static int wacom_i2c_open(struct input_dev *dev)
131{
132 struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
133 struct i2c_client *client = wac_i2c->client;
134
135 enable_irq(client->irq);
136
137 return 0;
138}
139
140static void wacom_i2c_close(struct input_dev *dev)
141{
142 struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
143 struct i2c_client *client = wac_i2c->client;
144
145 disable_irq(client->irq);
146}
147
148static int wacom_i2c_probe(struct i2c_client *client,
149 const struct i2c_device_id *id)
150{
151 struct wacom_i2c *wac_i2c;
152 struct input_dev *input;
153 struct wacom_features features = { 0 };
154 int error;
155
156 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
157 dev_err(&client->dev, "i2c_check_functionality error\n");
158 return -EIO;
159 }
160
161 error = wacom_query_device(client, &features);
162 if (error)
163 return error;
164
165 wac_i2c = kzalloc(sizeof(*wac_i2c), GFP_KERNEL);
166 input = input_allocate_device();
167 if (!wac_i2c || !input) {
168 error = -ENOMEM;
169 goto err_free_mem;
170 }
171
172 wac_i2c->client = client;
173 wac_i2c->input = input;
174
175 input->name = "Wacom I2C Digitizer";
176 input->id.bustype = BUS_I2C;
177 input->id.vendor = 0x56a;
178 input->id.version = features.fw_version;
179 input->dev.parent = &client->dev;
180 input->open = wacom_i2c_open;
181 input->close = wacom_i2c_close;
182
183 input->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
184
185 __set_bit(BTN_TOOL_PEN, input->keybit);
186 __set_bit(BTN_TOOL_RUBBER, input->keybit);
187 __set_bit(BTN_STYLUS, input->keybit);
188 __set_bit(BTN_STYLUS2, input->keybit);
189 __set_bit(BTN_TOUCH, input->keybit);
190
191 input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0);
192 input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0);
193 input_set_abs_params(input, ABS_PRESSURE,
194 0, features.pressure_max, 0, 0);
195
196 input_set_drvdata(input, wac_i2c);
197
198 error = request_threaded_irq(client->irq, NULL, wacom_i2c_irq,
199 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
200 "wacom_i2c", wac_i2c);
201 if (error) {
202 dev_err(&client->dev,
203 "Failed to enable IRQ, error: %d\n", error);
204 goto err_free_mem;
205 }
206
207 /* Disable the IRQ, we'll enable it in wac_i2c_open() */
208 disable_irq(client->irq);
209
210 error = input_register_device(wac_i2c->input);
211 if (error) {
212 dev_err(&client->dev,
213 "Failed to register input device, error: %d\n", error);
214 goto err_free_irq;
215 }
216
217 i2c_set_clientdata(client, wac_i2c);
218 return 0;
219
220err_free_irq:
221 free_irq(client->irq, wac_i2c);
222err_free_mem:
223 input_free_device(input);
224 kfree(wac_i2c);
225
226 return error;
227}
228
229static int wacom_i2c_remove(struct i2c_client *client)
230{
231 struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
232
233 free_irq(client->irq, wac_i2c);
234 input_unregister_device(wac_i2c->input);
235 kfree(wac_i2c);
236
237 return 0;
238}
239
240static int __maybe_unused wacom_i2c_suspend(struct device *dev)
241{
242 struct i2c_client *client = to_i2c_client(dev);
243
244 disable_irq(client->irq);
245
246 return 0;
247}
248
249static int __maybe_unused wacom_i2c_resume(struct device *dev)
250{
251 struct i2c_client *client = to_i2c_client(dev);
252
253 enable_irq(client->irq);
254
255 return 0;
256}
257
258static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume);
259
260static const struct i2c_device_id wacom_i2c_id[] = {
261 { "WAC_I2C_EMR", 0 },
262 { },
263};
264MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
265
266static struct i2c_driver wacom_i2c_driver = {
267 .driver = {
268 .name = "wacom_i2c",
269 .pm = &wacom_i2c_pm,
270 },
271
272 .probe = wacom_i2c_probe,
273 .remove = wacom_i2c_remove,
274 .id_table = wacom_i2c_id,
275};
276module_i2c_driver(wacom_i2c_driver);
277
278MODULE_AUTHOR("Tatsunosuke Tobita <tobita.tatsunosuke@wacom.co.jp>");
279MODULE_DESCRIPTION("WACOM EMR I2C Driver");
280MODULE_LICENSE("GPL");