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