1 // SPDX-License-Identifier: GPL-2.0
4 * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
7 #include <linux/delay.h>
8 #include <linux/gpio/consumer.h>
10 #include <linux/interrupt.h>
11 #include <linux/input.h>
12 #include <linux/input/mt.h>
13 #include <linux/input/touchscreen.h>
14 #include <linux/irq.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/regmap.h>
18 #include <asm/unaligned.h>
20 #define HY46XX_CHKSUM_CODE 0x1
21 #define HY46XX_FINGER_NUM 0x2
22 #define HY46XX_CHKSUM_LEN 0x7
23 #define HY46XX_THRESHOLD 0x80
24 #define HY46XX_GLOVE_EN 0x84
25 #define HY46XX_REPORT_SPEED 0x88
26 #define HY46XX_PWR_NOISE_EN 0x89
27 #define HY46XX_FILTER_DATA 0x8A
28 #define HY46XX_GAIN 0x92
29 #define HY46XX_EDGE_OFFSET 0x93
30 #define HY46XX_RX_NR_USED 0x94
31 #define HY46XX_TX_NR_USED 0x95
32 #define HY46XX_PWR_MODE 0xA5
33 #define HY46XX_FW_VERSION 0xA6
34 #define HY46XX_LIB_VERSION 0xA7
35 #define HY46XX_TP_INFO 0xA8
36 #define HY46XX_TP_CHIP_ID 0xA9
37 #define HY46XX_BOOT_VER 0xB0
39 #define HY46XX_TPLEN 0x6
40 #define HY46XX_REPORT_PKT_LEN 0x44
42 #define HY46XX_MAX_SUPPORTED_POINTS 11
44 #define TOUCH_EVENT_DOWN 0x00
45 #define TOUCH_EVENT_UP 0x01
46 #define TOUCH_EVENT_CONTACT 0x02
47 #define TOUCH_EVENT_RESERVED 0x03
49 struct hycon_hy46xx_data {
50 struct i2c_client *client;
51 struct input_dev *input;
52 struct touchscreen_properties prop;
53 struct regulator *vcc;
55 struct gpio_desc *reset_gpio;
58 struct regmap *regmap;
63 bool noise_filter_enable;
74 int bootloader_version;
77 static const struct regmap_config hycon_hy46xx_i2c_regmap_config = {
82 static bool hycon_hy46xx_check_checksum(struct hycon_hy46xx_data *tsdata, u8 *buf)
87 for (i = 2; i < buf[HY46XX_CHKSUM_LEN]; i++)
90 if (chksum == buf[HY46XX_CHKSUM_CODE])
93 dev_err_ratelimited(&tsdata->client->dev,
94 "checksum error: 0x%02x expected, got 0x%02x\n",
95 chksum, buf[HY46XX_CHKSUM_CODE]);
100 static irqreturn_t hycon_hy46xx_isr(int irq, void *dev_id)
102 struct hycon_hy46xx_data *tsdata = dev_id;
103 struct device *dev = &tsdata->client->dev;
104 u8 rdbuf[HY46XX_REPORT_PKT_LEN];
108 memset(rdbuf, 0, sizeof(rdbuf));
110 error = regmap_bulk_read(tsdata->regmap, 0, rdbuf, sizeof(rdbuf));
112 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
117 if (!hycon_hy46xx_check_checksum(tsdata, rdbuf))
120 for (i = 0; i < HY46XX_MAX_SUPPORTED_POINTS; i++) {
121 u8 *buf = &rdbuf[3 + (HY46XX_TPLEN * i)];
122 int type = buf[0] >> 6;
124 if (type == TOUCH_EVENT_RESERVED)
127 x = get_unaligned_be16(buf) & 0x0fff;
128 y = get_unaligned_be16(buf + 2) & 0x0fff;
132 input_mt_slot(tsdata->input, id);
133 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
134 type != TOUCH_EVENT_UP))
135 touchscreen_report_pos(tsdata->input, &tsdata->prop,
139 input_mt_report_pointer_emulation(tsdata->input, false);
140 input_sync(tsdata->input);
146 struct hycon_hy46xx_attribute {
147 struct device_attribute dattr;
154 #define HYCON_ATTR_U8(_field, _mode, _address, _limit_low, _limit_high) \
155 struct hycon_hy46xx_attribute hycon_hy46xx_attr_##_field = { \
156 .dattr = __ATTR(_field, _mode, \
157 hycon_hy46xx_setting_show, \
158 hycon_hy46xx_setting_store), \
159 .field_offset = offsetof(struct hycon_hy46xx_data, _field), \
160 .address = _address, \
161 .limit_low = _limit_low, \
162 .limit_high = _limit_high, \
165 #define HYCON_ATTR_BOOL(_field, _mode, _address) \
166 struct hycon_hy46xx_attribute hycon_hy46xx_attr_##_field = { \
167 .dattr = __ATTR(_field, _mode, \
168 hycon_hy46xx_setting_show, \
169 hycon_hy46xx_setting_store), \
170 .field_offset = offsetof(struct hycon_hy46xx_data, _field), \
171 .address = _address, \
172 .limit_low = false, \
173 .limit_high = true, \
176 static ssize_t hycon_hy46xx_setting_show(struct device *dev,
177 struct device_attribute *dattr, char *buf)
179 struct i2c_client *client = to_i2c_client(dev);
180 struct hycon_hy46xx_data *tsdata = i2c_get_clientdata(client);
181 struct hycon_hy46xx_attribute *attr =
182 container_of(dattr, struct hycon_hy46xx_attribute, dattr);
183 u8 *field = (u8 *)tsdata + attr->field_offset;
188 mutex_lock(&tsdata->mutex);
190 error = regmap_read(tsdata->regmap, attr->address, &val);
192 dev_err(&tsdata->client->dev,
193 "Failed to fetch attribute %s, error %d\n",
194 dattr->attr.name, error);
199 dev_warn(&tsdata->client->dev,
200 "%s: read (%d) and stored value (%d) differ\n",
201 dattr->attr.name, val, *field);
205 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
208 mutex_unlock(&tsdata->mutex);
209 return error ?: count;
212 static ssize_t hycon_hy46xx_setting_store(struct device *dev,
213 struct device_attribute *dattr,
214 const char *buf, size_t count)
216 struct i2c_client *client = to_i2c_client(dev);
217 struct hycon_hy46xx_data *tsdata = i2c_get_clientdata(client);
218 struct hycon_hy46xx_attribute *attr =
219 container_of(dattr, struct hycon_hy46xx_attribute, dattr);
220 u8 *field = (u8 *)tsdata + attr->field_offset;
224 mutex_lock(&tsdata->mutex);
226 error = kstrtouint(buf, 0, &val);
230 if (val < attr->limit_low || val > attr->limit_high) {
235 error = regmap_write(tsdata->regmap, attr->address, val);
237 dev_err(&tsdata->client->dev,
238 "Failed to update attribute %s, error: %d\n",
239 dattr->attr.name, error);
245 mutex_unlock(&tsdata->mutex);
246 return error ?: count;
249 static HYCON_ATTR_U8(threshold, 0644, HY46XX_THRESHOLD, 0, 255);
250 static HYCON_ATTR_BOOL(glove_enable, 0644, HY46XX_GLOVE_EN);
251 static HYCON_ATTR_U8(report_speed, 0644, HY46XX_REPORT_SPEED, 0, 255);
252 static HYCON_ATTR_BOOL(noise_filter_enable, 0644, HY46XX_PWR_NOISE_EN);
253 static HYCON_ATTR_U8(filter_data, 0644, HY46XX_FILTER_DATA, 0, 5);
254 static HYCON_ATTR_U8(gain, 0644, HY46XX_GAIN, 0, 5);
255 static HYCON_ATTR_U8(edge_offset, 0644, HY46XX_EDGE_OFFSET, 0, 5);
256 static HYCON_ATTR_U8(fw_version, 0444, HY46XX_FW_VERSION, 0, 255);
257 static HYCON_ATTR_U8(lib_version, 0444, HY46XX_LIB_VERSION, 0, 255);
258 static HYCON_ATTR_U8(tp_information, 0444, HY46XX_TP_INFO, 0, 255);
259 static HYCON_ATTR_U8(tp_chip_id, 0444, HY46XX_TP_CHIP_ID, 0, 255);
260 static HYCON_ATTR_U8(bootloader_version, 0444, HY46XX_BOOT_VER, 0, 255);
262 static struct attribute *hycon_hy46xx_attrs[] = {
263 &hycon_hy46xx_attr_threshold.dattr.attr,
264 &hycon_hy46xx_attr_glove_enable.dattr.attr,
265 &hycon_hy46xx_attr_report_speed.dattr.attr,
266 &hycon_hy46xx_attr_noise_filter_enable.dattr.attr,
267 &hycon_hy46xx_attr_filter_data.dattr.attr,
268 &hycon_hy46xx_attr_gain.dattr.attr,
269 &hycon_hy46xx_attr_edge_offset.dattr.attr,
270 &hycon_hy46xx_attr_fw_version.dattr.attr,
271 &hycon_hy46xx_attr_lib_version.dattr.attr,
272 &hycon_hy46xx_attr_tp_information.dattr.attr,
273 &hycon_hy46xx_attr_tp_chip_id.dattr.attr,
274 &hycon_hy46xx_attr_bootloader_version.dattr.attr,
277 ATTRIBUTE_GROUPS(hycon_hy46xx);
279 static void hycon_hy46xx_get_defaults(struct device *dev, struct hycon_hy46xx_data *tsdata)
285 error = device_property_read_u32(dev, "hycon,threshold", &val);
287 error = regmap_write(tsdata->regmap, HY46XX_THRESHOLD, val);
291 tsdata->threshold = val;
294 val_bool = device_property_read_bool(dev, "hycon,glove-enable");
295 error = regmap_write(tsdata->regmap, HY46XX_GLOVE_EN, val_bool);
298 tsdata->glove_enable = val_bool;
300 error = device_property_read_u32(dev, "hycon,report-speed-hz", &val);
302 error = regmap_write(tsdata->regmap, HY46XX_REPORT_SPEED, val);
306 tsdata->report_speed = val;
309 val_bool = device_property_read_bool(dev, "hycon,noise-filter-enable");
310 error = regmap_write(tsdata->regmap, HY46XX_PWR_NOISE_EN, val_bool);
313 tsdata->noise_filter_enable = val_bool;
315 error = device_property_read_u32(dev, "hycon,filter-data", &val);
317 error = regmap_write(tsdata->regmap, HY46XX_FILTER_DATA, val);
321 tsdata->filter_data = val;
324 error = device_property_read_u32(dev, "hycon,gain", &val);
326 error = regmap_write(tsdata->regmap, HY46XX_GAIN, val);
333 error = device_property_read_u32(dev, "hycon,edge-offset", &val);
335 error = regmap_write(tsdata->regmap, HY46XX_EDGE_OFFSET, val);
339 tsdata->edge_offset = val;
344 dev_err(&tsdata->client->dev, "Failed to set default settings");
347 static void hycon_hy46xx_get_parameters(struct hycon_hy46xx_data *tsdata)
352 error = regmap_read(tsdata->regmap, HY46XX_THRESHOLD, &val);
355 tsdata->threshold = val;
357 error = regmap_read(tsdata->regmap, HY46XX_GLOVE_EN, &val);
360 tsdata->glove_enable = val;
362 error = regmap_read(tsdata->regmap, HY46XX_REPORT_SPEED, &val);
365 tsdata->report_speed = val;
367 error = regmap_read(tsdata->regmap, HY46XX_PWR_NOISE_EN, &val);
370 tsdata->noise_filter_enable = val;
372 error = regmap_read(tsdata->regmap, HY46XX_FILTER_DATA, &val);
375 tsdata->filter_data = val;
377 error = regmap_read(tsdata->regmap, HY46XX_GAIN, &val);
382 error = regmap_read(tsdata->regmap, HY46XX_EDGE_OFFSET, &val);
385 tsdata->edge_offset = val;
387 error = regmap_read(tsdata->regmap, HY46XX_RX_NR_USED, &val);
390 tsdata->rx_number_used = val;
392 error = regmap_read(tsdata->regmap, HY46XX_TX_NR_USED, &val);
395 tsdata->tx_number_used = val;
397 error = regmap_read(tsdata->regmap, HY46XX_PWR_MODE, &val);
400 tsdata->power_mode = val;
402 error = regmap_read(tsdata->regmap, HY46XX_FW_VERSION, &val);
405 tsdata->fw_version = val;
407 error = regmap_read(tsdata->regmap, HY46XX_LIB_VERSION, &val);
410 tsdata->lib_version = val;
412 error = regmap_read(tsdata->regmap, HY46XX_TP_INFO, &val);
415 tsdata->tp_information = val;
417 error = regmap_read(tsdata->regmap, HY46XX_TP_CHIP_ID, &val);
420 tsdata->tp_chip_id = val;
422 error = regmap_read(tsdata->regmap, HY46XX_BOOT_VER, &val);
425 tsdata->bootloader_version = val;
429 dev_err(&tsdata->client->dev, "Failed to read default settings");
432 static void hycon_hy46xx_disable_regulator(void *arg)
434 struct hycon_hy46xx_data *data = arg;
436 regulator_disable(data->vcc);
439 static int hycon_hy46xx_probe(struct i2c_client *client)
441 struct hycon_hy46xx_data *tsdata;
442 struct input_dev *input;
445 dev_dbg(&client->dev, "probing for HYCON HY46XX I2C\n");
447 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
451 tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
452 if (IS_ERR(tsdata->vcc)) {
453 error = PTR_ERR(tsdata->vcc);
454 if (error != -EPROBE_DEFER)
455 dev_err(&client->dev,
456 "failed to request regulator: %d\n", error);
460 error = regulator_enable(tsdata->vcc);
462 dev_err(&client->dev, "failed to enable vcc: %d\n", error);
466 error = devm_add_action_or_reset(&client->dev,
467 hycon_hy46xx_disable_regulator,
472 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
473 "reset", GPIOD_OUT_LOW);
474 if (IS_ERR(tsdata->reset_gpio)) {
475 error = PTR_ERR(tsdata->reset_gpio);
476 dev_err(&client->dev,
477 "Failed to request GPIO reset pin, error %d\n", error);
481 if (tsdata->reset_gpio) {
482 usleep_range(5000, 6000);
483 gpiod_set_value_cansleep(tsdata->reset_gpio, 1);
484 usleep_range(5000, 6000);
485 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
489 input = devm_input_allocate_device(&client->dev);
491 dev_err(&client->dev, "failed to allocate input device.\n");
495 mutex_init(&tsdata->mutex);
496 tsdata->client = client;
497 tsdata->input = input;
499 tsdata->regmap = devm_regmap_init_i2c(client,
500 &hycon_hy46xx_i2c_regmap_config);
501 if (IS_ERR(tsdata->regmap)) {
502 dev_err(&client->dev, "regmap allocation failed\n");
503 return PTR_ERR(tsdata->regmap);
506 hycon_hy46xx_get_defaults(&client->dev, tsdata);
507 hycon_hy46xx_get_parameters(tsdata);
509 input->name = "Hycon Capacitive Touch";
510 input->id.bustype = BUS_I2C;
511 input->dev.parent = &client->dev;
513 input_set_abs_params(input, ABS_MT_POSITION_X, 0, -1, 0, 0);
514 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, -1, 0, 0);
516 touchscreen_parse_properties(input, true, &tsdata->prop);
518 error = input_mt_init_slots(input, HY46XX_MAX_SUPPORTED_POINTS,
521 dev_err(&client->dev, "Unable to init MT slots.\n");
525 i2c_set_clientdata(client, tsdata);
527 error = devm_request_threaded_irq(&client->dev, client->irq,
528 NULL, hycon_hy46xx_isr, IRQF_ONESHOT,
529 client->name, tsdata);
531 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
535 error = input_register_device(input);
539 dev_dbg(&client->dev,
540 "HYCON HY46XX initialized: IRQ %d, Reset pin %d.\n",
542 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
547 static const struct i2c_device_id hycon_hy46xx_id[] = {
548 { .name = "hy4613" },
549 { .name = "hy4614" },
550 { .name = "hy4621" },
551 { .name = "hy4623" },
552 { .name = "hy4633" },
553 { .name = "hy4635" },
556 MODULE_DEVICE_TABLE(i2c, hycon_hy46xx_id);
558 static const struct of_device_id hycon_hy46xx_of_match[] = {
559 { .compatible = "hycon,hy4613" },
560 { .compatible = "hycon,hy4614" },
561 { .compatible = "hycon,hy4621" },
562 { .compatible = "hycon,hy4623" },
563 { .compatible = "hycon,hy4633" },
564 { .compatible = "hycon,hy4635" },
567 MODULE_DEVICE_TABLE(of, hycon_hy46xx_of_match);
569 static struct i2c_driver hycon_hy46xx_driver = {
571 .name = "hycon_hy46xx",
572 .dev_groups = hycon_hy46xx_groups,
573 .of_match_table = hycon_hy46xx_of_match,
574 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
576 .id_table = hycon_hy46xx_id,
577 .probe = hycon_hy46xx_probe,
580 module_i2c_driver(hycon_hy46xx_driver);
582 MODULE_AUTHOR("Giulio Benetti <giulio.benetti@benettiengineering.com>");
583 MODULE_DESCRIPTION("HYCON HY46XX I2C Touchscreen Driver");
584 MODULE_LICENSE("GPL v2");