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5a966261 TT |
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; | |
5a966261 TT |
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 | ||
5a966261 TT |
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 | ||
d5687782 DT |
102 | error = i2c_master_recv(wac_i2c->client, |
103 | wac_i2c->data, sizeof(wac_i2c->data)); | |
104 | if (error < 0) | |
5a966261 TT |
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; | |
5a966261 TT |
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 __devinit 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; | |
8830cb88 | 152 | struct wacom_features features = { 0 }; |
5a966261 TT |
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 | ||
5a966261 TT |
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; | |
5a966261 TT |
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, | |
d5687782 | 198 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
5a966261 TT |
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 __devexit 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 = __devexit_p(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"); |