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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9ca5bf50 SV |
2 | /* |
3 | * Driver for ELAN eKTF2127 i2c touchscreen controller | |
4 | * | |
5 | * For this driver the layout of the Chipone icn8318 i2c | |
6 | * touchscreencontroller is used. | |
7 | * | |
9ca5bf50 SV |
8 | * Author: |
9 | * Michel Verlaan <michel.verl@gmail.com> | |
10 | * Siebren Vroegindeweij <siebren.vroegindeweij@hotmail.com> | |
11 | * | |
12 | * Original chipone_icn8318 driver: | |
13 | * Hans de Goede <hdegoede@redhat.com> | |
14 | */ | |
15 | ||
16 | #include <linux/gpio/consumer.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/input/mt.h> | |
21 | #include <linux/input/touchscreen.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/delay.h> | |
25 | ||
26 | /* Packet header defines (first byte of data send / received) */ | |
27 | #define EKTF2127_NOISE 0x40 | |
28 | #define EKTF2127_RESPONSE 0x52 | |
29 | #define EKTF2127_REQUEST 0x53 | |
30 | #define EKTF2127_HELLO 0x55 | |
af5689fb | 31 | #define EKTF2127_REPORT2 0x5a |
9ca5bf50 SV |
32 | #define EKTF2127_REPORT 0x5d |
33 | #define EKTF2127_CALIB_DONE 0x66 | |
34 | ||
35 | /* Register defines (second byte of data send / received) */ | |
36 | #define EKTF2127_ENV_NOISY 0x41 | |
37 | #define EKTF2127_HEIGHT 0x60 | |
38 | #define EKTF2127_WIDTH 0x63 | |
39 | ||
40 | /* 2 bytes header + 5 * 3 bytes coordinates + 3 bytes pressure info + footer */ | |
41 | #define EKTF2127_TOUCH_REPORT_SIZE 21 | |
42 | #define EKTF2127_MAX_TOUCHES 5 | |
43 | ||
44 | struct ektf2127_ts { | |
45 | struct i2c_client *client; | |
46 | struct input_dev *input; | |
47 | struct gpio_desc *power_gpios; | |
48 | struct touchscreen_properties prop; | |
49 | }; | |
50 | ||
249d1bb2 | 51 | static void ektf2127_parse_coordinates(const u8 *buf, unsigned int touch_count, |
9ca5bf50 SV |
52 | struct input_mt_pos *touches) |
53 | { | |
54 | int index = 0; | |
55 | int i; | |
56 | ||
57 | for (i = 0; i < touch_count; i++) { | |
58 | index = 2 + i * 3; | |
59 | ||
60 | touches[i].x = (buf[index] & 0x0f); | |
61 | touches[i].x <<= 8; | |
62 | touches[i].x |= buf[index + 2]; | |
63 | ||
64 | touches[i].y = (buf[index] & 0xf0); | |
65 | touches[i].y <<= 4; | |
66 | touches[i].y |= buf[index + 1]; | |
67 | } | |
68 | } | |
69 | ||
70 | static void ektf2127_report_event(struct ektf2127_ts *ts, const u8 *buf) | |
71 | { | |
72 | struct input_mt_pos touches[EKTF2127_MAX_TOUCHES]; | |
73 | int slots[EKTF2127_MAX_TOUCHES]; | |
74 | unsigned int touch_count, i; | |
75 | ||
76 | touch_count = buf[1] & 0x07; | |
77 | if (touch_count > EKTF2127_MAX_TOUCHES) { | |
78 | dev_err(&ts->client->dev, | |
79 | "Too many touches %d > %d\n", | |
80 | touch_count, EKTF2127_MAX_TOUCHES); | |
81 | touch_count = EKTF2127_MAX_TOUCHES; | |
82 | } | |
83 | ||
84 | ektf2127_parse_coordinates(buf, touch_count, touches); | |
85 | input_mt_assign_slots(ts->input, slots, touches, | |
86 | touch_count, 0); | |
87 | ||
88 | for (i = 0; i < touch_count; i++) { | |
89 | input_mt_slot(ts->input, slots[i]); | |
90 | input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true); | |
91 | touchscreen_report_pos(ts->input, &ts->prop, | |
92 | touches[i].x, touches[i].y, true); | |
93 | } | |
94 | ||
95 | input_mt_sync_frame(ts->input); | |
96 | input_sync(ts->input); | |
97 | } | |
98 | ||
af5689fb JN |
99 | static void ektf2127_report2_contact(struct ektf2127_ts *ts, int slot, |
100 | const u8 *buf, bool active) | |
101 | { | |
102 | input_mt_slot(ts->input, slot); | |
103 | input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, active); | |
104 | ||
105 | if (active) { | |
106 | int x = (buf[0] & 0xf0) << 4 | buf[1]; | |
107 | int y = (buf[0] & 0x0f) << 8 | buf[2]; | |
108 | ||
109 | touchscreen_report_pos(ts->input, &ts->prop, x, y, true); | |
110 | } | |
111 | } | |
112 | ||
113 | static void ektf2127_report2_event(struct ektf2127_ts *ts, const u8 *buf) | |
114 | { | |
115 | ektf2127_report2_contact(ts, 0, &buf[1], !!(buf[7] & 2)); | |
116 | ektf2127_report2_contact(ts, 1, &buf[4], !!(buf[7] & 4)); | |
117 | ||
118 | input_mt_sync_frame(ts->input); | |
119 | input_sync(ts->input); | |
120 | } | |
121 | ||
9ca5bf50 SV |
122 | static irqreturn_t ektf2127_irq(int irq, void *dev_id) |
123 | { | |
124 | struct ektf2127_ts *ts = dev_id; | |
125 | struct device *dev = &ts->client->dev; | |
126 | char buf[EKTF2127_TOUCH_REPORT_SIZE]; | |
127 | int ret; | |
128 | ||
129 | ret = i2c_master_recv(ts->client, buf, EKTF2127_TOUCH_REPORT_SIZE); | |
130 | if (ret != EKTF2127_TOUCH_REPORT_SIZE) { | |
131 | dev_err(dev, "Error reading touch data: %d\n", ret); | |
132 | goto out; | |
133 | } | |
134 | ||
135 | switch (buf[0]) { | |
136 | case EKTF2127_REPORT: | |
137 | ektf2127_report_event(ts, buf); | |
138 | break; | |
139 | ||
af5689fb JN |
140 | case EKTF2127_REPORT2: |
141 | ektf2127_report2_event(ts, buf); | |
142 | break; | |
143 | ||
9ca5bf50 SV |
144 | case EKTF2127_NOISE: |
145 | if (buf[1] == EKTF2127_ENV_NOISY) | |
146 | dev_dbg(dev, "Environment is electrically noisy\n"); | |
147 | break; | |
148 | ||
149 | case EKTF2127_HELLO: | |
150 | case EKTF2127_CALIB_DONE: | |
151 | break; | |
152 | ||
153 | default: | |
154 | dev_err(dev, "Unexpected packet header byte %#02x\n", buf[0]); | |
155 | break; | |
156 | } | |
157 | ||
158 | out: | |
159 | return IRQ_HANDLED; | |
160 | } | |
161 | ||
162 | static int ektf2127_start(struct input_dev *dev) | |
163 | { | |
164 | struct ektf2127_ts *ts = input_get_drvdata(dev); | |
165 | ||
166 | enable_irq(ts->client->irq); | |
167 | gpiod_set_value_cansleep(ts->power_gpios, 1); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static void ektf2127_stop(struct input_dev *dev) | |
173 | { | |
174 | struct ektf2127_ts *ts = input_get_drvdata(dev); | |
175 | ||
176 | disable_irq(ts->client->irq); | |
177 | gpiod_set_value_cansleep(ts->power_gpios, 0); | |
178 | } | |
179 | ||
717ba04a | 180 | static int ektf2127_suspend(struct device *dev) |
9ca5bf50 SV |
181 | { |
182 | struct ektf2127_ts *ts = i2c_get_clientdata(to_i2c_client(dev)); | |
183 | ||
184 | mutex_lock(&ts->input->mutex); | |
d69f0a43 | 185 | if (input_device_enabled(ts->input)) |
9ca5bf50 SV |
186 | ektf2127_stop(ts->input); |
187 | mutex_unlock(&ts->input->mutex); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
717ba04a | 192 | static int ektf2127_resume(struct device *dev) |
9ca5bf50 SV |
193 | { |
194 | struct ektf2127_ts *ts = i2c_get_clientdata(to_i2c_client(dev)); | |
195 | ||
196 | mutex_lock(&ts->input->mutex); | |
d69f0a43 | 197 | if (input_device_enabled(ts->input)) |
9ca5bf50 SV |
198 | ektf2127_start(ts->input); |
199 | mutex_unlock(&ts->input->mutex); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
717ba04a JC |
204 | static DEFINE_SIMPLE_DEV_PM_OPS(ektf2127_pm_ops, ektf2127_suspend, |
205 | ektf2127_resume); | |
9ca5bf50 SV |
206 | |
207 | static int ektf2127_query_dimension(struct i2c_client *client, bool width) | |
208 | { | |
209 | struct device *dev = &client->dev; | |
210 | const char *what = width ? "width" : "height"; | |
211 | u8 what_code = width ? EKTF2127_WIDTH : EKTF2127_HEIGHT; | |
212 | u8 buf[4]; | |
213 | int ret; | |
214 | int error; | |
215 | ||
216 | /* Request dimension */ | |
217 | buf[0] = EKTF2127_REQUEST; | |
218 | buf[1] = width ? EKTF2127_WIDTH : EKTF2127_HEIGHT; | |
219 | buf[2] = 0x00; | |
220 | buf[3] = 0x00; | |
221 | ret = i2c_master_send(client, buf, sizeof(buf)); | |
222 | if (ret != sizeof(buf)) { | |
223 | error = ret < 0 ? ret : -EIO; | |
224 | dev_err(dev, "Failed to request %s: %d\n", what, error); | |
225 | return error; | |
226 | } | |
227 | ||
228 | msleep(20); | |
229 | ||
230 | /* Read response */ | |
231 | ret = i2c_master_recv(client, buf, sizeof(buf)); | |
232 | if (ret != sizeof(buf)) { | |
233 | error = ret < 0 ? ret : -EIO; | |
234 | dev_err(dev, "Failed to receive %s data: %d\n", what, error); | |
235 | return error; | |
236 | } | |
237 | ||
238 | if (buf[0] != EKTF2127_RESPONSE || buf[1] != what_code) { | |
239 | dev_err(dev, "Unexpected %s data: %#02x %#02x\n", | |
240 | what, buf[0], buf[1]); | |
241 | return -EIO; | |
242 | } | |
243 | ||
244 | return (((buf[3] & 0xf0) << 4) | buf[2]) - 1; | |
245 | } | |
246 | ||
4e4c8b54 | 247 | static int ektf2127_probe(struct i2c_client *client) |
9ca5bf50 SV |
248 | { |
249 | struct device *dev = &client->dev; | |
250 | struct ektf2127_ts *ts; | |
251 | struct input_dev *input; | |
252 | u8 buf[4]; | |
253 | int max_x, max_y; | |
254 | int error; | |
255 | ||
256 | if (!client->irq) { | |
257 | dev_err(dev, "Error no irq specified\n"); | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); | |
262 | if (!ts) | |
263 | return -ENOMEM; | |
264 | ||
265 | /* This requests the gpio *and* turns on the touchscreen controller */ | |
266 | ts->power_gpios = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH); | |
d9efc285 KK |
267 | if (IS_ERR(ts->power_gpios)) |
268 | return dev_err_probe(dev, PTR_ERR(ts->power_gpios), "Error getting power gpio\n"); | |
9ca5bf50 SV |
269 | |
270 | input = devm_input_allocate_device(dev); | |
271 | if (!input) | |
272 | return -ENOMEM; | |
273 | ||
274 | input->name = client->name; | |
275 | input->id.bustype = BUS_I2C; | |
276 | input->open = ektf2127_start; | |
277 | input->close = ektf2127_stop; | |
278 | ||
279 | ts->client = client; | |
280 | ||
281 | /* Read hello (ignore result, depends on initial power state) */ | |
282 | msleep(20); | |
283 | i2c_master_recv(ts->client, buf, sizeof(buf)); | |
284 | ||
285 | /* Read resolution from chip */ | |
286 | max_x = ektf2127_query_dimension(client, true); | |
287 | if (max_x < 0) | |
288 | return max_x; | |
289 | ||
290 | max_y = ektf2127_query_dimension(client, false); | |
291 | if (max_y < 0) | |
292 | return max_y; | |
293 | ||
294 | input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_x, 0, 0); | |
295 | input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_y, 0, 0); | |
296 | touchscreen_parse_properties(input, true, &ts->prop); | |
297 | ||
298 | error = input_mt_init_slots(input, EKTF2127_MAX_TOUCHES, | |
299 | INPUT_MT_DIRECT | | |
300 | INPUT_MT_DROP_UNUSED | | |
301 | INPUT_MT_TRACK); | |
302 | if (error) | |
303 | return error; | |
304 | ||
305 | ts->input = input; | |
306 | input_set_drvdata(input, ts); | |
307 | ||
308 | error = devm_request_threaded_irq(dev, client->irq, | |
309 | NULL, ektf2127_irq, | |
310 | IRQF_ONESHOT, client->name, ts); | |
311 | if (error) { | |
312 | dev_err(dev, "Error requesting irq: %d\n", error); | |
313 | return error; | |
314 | } | |
315 | ||
316 | /* Stop device till opened */ | |
317 | ektf2127_stop(ts->input); | |
318 | ||
319 | error = input_register_device(input); | |
320 | if (error) | |
321 | return error; | |
322 | ||
323 | i2c_set_clientdata(client, ts); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | #ifdef CONFIG_OF | |
329 | static const struct of_device_id ektf2127_of_match[] = { | |
330 | { .compatible = "elan,ektf2127" }, | |
af5689fb | 331 | { .compatible = "elan,ektf2132" }, |
9ca5bf50 SV |
332 | {} |
333 | }; | |
334 | MODULE_DEVICE_TABLE(of, ektf2127_of_match); | |
335 | #endif | |
336 | ||
337 | static const struct i2c_device_id ektf2127_i2c_id[] = { | |
5852f2af UKK |
338 | { "ektf2127" }, |
339 | { "ektf2132" }, | |
9ca5bf50 SV |
340 | {} |
341 | }; | |
342 | MODULE_DEVICE_TABLE(i2c, ektf2127_i2c_id); | |
343 | ||
344 | static struct i2c_driver ektf2127_driver = { | |
345 | .driver = { | |
346 | .name = "elan_ektf2127", | |
717ba04a | 347 | .pm = pm_sleep_ptr(&ektf2127_pm_ops), |
9ca5bf50 SV |
348 | .of_match_table = of_match_ptr(ektf2127_of_match), |
349 | }, | |
d8bde56d | 350 | .probe = ektf2127_probe, |
9ca5bf50 SV |
351 | .id_table = ektf2127_i2c_id, |
352 | }; | |
353 | module_i2c_driver(ektf2127_driver); | |
354 | ||
af5689fb | 355 | MODULE_DESCRIPTION("ELAN eKTF2127/eKTF2132 I2C Touchscreen Driver"); |
9ca5bf50 SV |
356 | MODULE_AUTHOR("Michel Verlaan, Siebren Vroegindeweij"); |
357 | MODULE_LICENSE("GPL"); |