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83f66a6f JW |
1 | /* |
2 | * Copyright (C) 2016, Jelle van der Waa <jelle@vdwaa.nl> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; either version 2 of the License, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/input.h> | |
18 | #include <linux/input/mt.h> | |
19 | #include <linux/input/touchscreen.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <asm/unaligned.h> | |
24 | ||
25 | #define ZET6223_MAX_FINGERS 16 | |
26 | #define ZET6223_MAX_PKT_SIZE (3 + 4 * ZET6223_MAX_FINGERS) | |
27 | ||
28 | #define ZET6223_CMD_INFO 0xB2 | |
29 | #define ZET6223_CMD_INFO_LENGTH 17 | |
30 | #define ZET6223_VALID_PACKET 0x3c | |
31 | ||
32 | #define ZET6223_POWER_ON_DELAY_MSEC 30 | |
33 | ||
34 | struct zet6223_ts { | |
35 | struct i2c_client *client; | |
36 | struct input_dev *input; | |
37 | struct regulator *vcc; | |
38 | struct regulator *vio; | |
39 | struct touchscreen_properties prop; | |
40 | struct regulator_bulk_data supplies[2]; | |
41 | u16 max_x; | |
42 | u16 max_y; | |
43 | u8 fingernum; | |
44 | }; | |
45 | ||
46 | static int zet6223_start(struct input_dev *dev) | |
47 | { | |
48 | struct zet6223_ts *ts = input_get_drvdata(dev); | |
49 | ||
50 | enable_irq(ts->client->irq); | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static void zet6223_stop(struct input_dev *dev) | |
56 | { | |
57 | struct zet6223_ts *ts = input_get_drvdata(dev); | |
58 | ||
59 | disable_irq(ts->client->irq); | |
60 | } | |
61 | ||
62 | static irqreturn_t zet6223_irq(int irq, void *dev_id) | |
63 | { | |
64 | struct zet6223_ts *ts = dev_id; | |
65 | u16 finger_bits; | |
66 | ||
67 | /* | |
68 | * First 3 bytes are an identifier, two bytes of finger data. | |
69 | * X, Y data per finger is 4 bytes. | |
70 | */ | |
71 | u8 bufsize = 3 + 4 * ts->fingernum; | |
72 | u8 buf[ZET6223_MAX_PKT_SIZE]; | |
73 | int i; | |
74 | int ret; | |
75 | int error; | |
76 | ||
77 | ret = i2c_master_recv(ts->client, buf, bufsize); | |
78 | if (ret != bufsize) { | |
79 | error = ret < 0 ? ret : -EIO; | |
80 | dev_err_ratelimited(&ts->client->dev, | |
81 | "Error reading input data: %d\n", error); | |
82 | return IRQ_HANDLED; | |
83 | } | |
84 | ||
85 | if (buf[0] != ZET6223_VALID_PACKET) | |
86 | return IRQ_HANDLED; | |
87 | ||
88 | finger_bits = get_unaligned_be16(buf + 1); | |
89 | for (i = 0; i < ts->fingernum; i++) { | |
90 | if (!(finger_bits & BIT(15 - i))) | |
91 | continue; | |
92 | ||
93 | input_mt_slot(ts->input, i); | |
94 | input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true); | |
95 | input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, | |
96 | ((buf[i + 3] >> 4) << 8) + buf[i + 4]); | |
97 | input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, | |
98 | ((buf[i + 3] & 0xF) << 8) + buf[i + 5]); | |
99 | } | |
100 | ||
101 | input_mt_sync_frame(ts->input); | |
102 | input_sync(ts->input); | |
103 | ||
104 | return IRQ_HANDLED; | |
105 | } | |
106 | ||
107 | static void zet6223_power_off(void *_ts) | |
108 | { | |
109 | struct zet6223_ts *ts = _ts; | |
110 | ||
111 | regulator_bulk_disable(ARRAY_SIZE(ts->supplies), ts->supplies); | |
112 | } | |
113 | ||
114 | static int zet6223_power_on(struct zet6223_ts *ts) | |
115 | { | |
116 | struct device *dev = &ts->client->dev; | |
117 | int error; | |
118 | ||
119 | ts->supplies[0].supply = "vio"; | |
120 | ts->supplies[1].supply = "vcc"; | |
121 | ||
122 | error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->supplies), | |
123 | ts->supplies); | |
124 | if (error) | |
125 | return error; | |
126 | ||
127 | error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies); | |
128 | if (error) | |
129 | return error; | |
130 | ||
131 | msleep(ZET6223_POWER_ON_DELAY_MSEC); | |
132 | ||
133 | error = devm_add_action_or_reset(dev, zet6223_power_off, ts); | |
134 | if (error) { | |
135 | dev_err(dev, "failed to install poweroff action: %d\n", error); | |
136 | return error; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int zet6223_query_device(struct zet6223_ts *ts) | |
143 | { | |
144 | u8 buf[ZET6223_CMD_INFO_LENGTH]; | |
145 | u8 cmd = ZET6223_CMD_INFO; | |
146 | int ret; | |
147 | int error; | |
148 | ||
149 | ret = i2c_master_send(ts->client, &cmd, sizeof(cmd)); | |
150 | if (ret != sizeof(cmd)) { | |
151 | error = ret < 0 ? ret : -EIO; | |
152 | dev_err(&ts->client->dev, | |
153 | "touchpanel info cmd failed: %d\n", error); | |
154 | return error; | |
155 | } | |
156 | ||
157 | ret = i2c_master_recv(ts->client, buf, sizeof(buf)); | |
158 | if (ret != sizeof(buf)) { | |
159 | error = ret < 0 ? ret : -EIO; | |
160 | dev_err(&ts->client->dev, | |
161 | "failed to retrieve touchpanel info: %d\n", error); | |
162 | return error; | |
163 | } | |
164 | ||
165 | ts->fingernum = buf[15] & 0x7F; | |
166 | if (ts->fingernum > ZET6223_MAX_FINGERS) { | |
167 | dev_warn(&ts->client->dev, | |
168 | "touchpanel reports %d fingers, limiting to %d\n", | |
169 | ts->fingernum, ZET6223_MAX_FINGERS); | |
170 | ts->fingernum = ZET6223_MAX_FINGERS; | |
171 | } | |
172 | ||
173 | ts->max_x = get_unaligned_le16(&buf[8]); | |
174 | ts->max_y = get_unaligned_le16(&buf[10]); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static int zet6223_probe(struct i2c_client *client, | |
180 | const struct i2c_device_id *id) | |
181 | { | |
182 | struct device *dev = &client->dev; | |
183 | struct zet6223_ts *ts; | |
184 | struct input_dev *input; | |
185 | int error; | |
186 | ||
187 | if (!client->irq) { | |
188 | dev_err(dev, "no irq specified\n"); | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); | |
193 | if (!ts) | |
194 | return -ENOMEM; | |
195 | ||
196 | ts->client = client; | |
197 | ||
198 | error = zet6223_power_on(ts); | |
199 | if (error) | |
200 | return error; | |
201 | ||
202 | error = zet6223_query_device(ts); | |
203 | if (error) | |
204 | return error; | |
205 | ||
206 | ts->input = input = devm_input_allocate_device(dev); | |
207 | if (!input) | |
208 | return -ENOMEM; | |
209 | ||
210 | input_set_drvdata(input, ts); | |
211 | ||
212 | input->name = client->name; | |
213 | input->id.bustype = BUS_I2C; | |
214 | input->open = zet6223_start; | |
215 | input->close = zet6223_stop; | |
216 | ||
217 | input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0); | |
218 | input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0); | |
219 | ||
220 | touchscreen_parse_properties(input, true, &ts->prop); | |
221 | ||
222 | error = input_mt_init_slots(input, ts->fingernum, | |
223 | INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); | |
224 | if (error) | |
225 | return error; | |
226 | ||
227 | error = devm_request_threaded_irq(dev, client->irq, NULL, zet6223_irq, | |
228 | IRQF_ONESHOT, client->name, ts); | |
229 | if (error) { | |
230 | dev_err(dev, "failed to request irq %d: %d\n", | |
231 | client->irq, error); | |
232 | return error; | |
233 | } | |
234 | ||
235 | zet6223_stop(input); | |
236 | ||
237 | error = input_register_device(input); | |
238 | if (error) | |
239 | return error; | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static const struct of_device_id zet6223_of_match[] = { | |
245 | { .compatible = "zeitec,zet6223" }, | |
246 | { } | |
247 | }; | |
a1b53592 | 248 | MODULE_DEVICE_TABLE(of, zet6223_of_match); |
83f66a6f JW |
249 | |
250 | static const struct i2c_device_id zet6223_id[] = { | |
251 | { "zet6223", 0}, | |
252 | { } | |
253 | }; | |
254 | MODULE_DEVICE_TABLE(i2c, zet6223_id); | |
255 | ||
256 | static struct i2c_driver zet6223_driver = { | |
257 | .driver = { | |
258 | .name = "zet6223", | |
259 | .of_match_table = zet6223_of_match, | |
260 | }, | |
261 | .probe = zet6223_probe, | |
262 | .id_table = zet6223_id | |
263 | }; | |
264 | module_i2c_driver(zet6223_driver); | |
265 | ||
266 | MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl>"); | |
267 | MODULE_DESCRIPTION("ZEITEC zet622x I2C touchscreen driver"); | |
268 | MODULE_LICENSE("GPL"); |