1aa2f62cfSGiulio Benetti // SPDX-License-Identifier: GPL-2.0
2aa2f62cfSGiulio Benetti /*
3aa2f62cfSGiulio Benetti * Copyright (C) 2021
4aa2f62cfSGiulio Benetti * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
5aa2f62cfSGiulio Benetti */
6aa2f62cfSGiulio Benetti
7aa2f62cfSGiulio Benetti #include <linux/delay.h>
8aa2f62cfSGiulio Benetti #include <linux/gpio/consumer.h>
9aa2f62cfSGiulio Benetti #include <linux/i2c.h>
10aa2f62cfSGiulio Benetti #include <linux/interrupt.h>
11aa2f62cfSGiulio Benetti #include <linux/input.h>
12aa2f62cfSGiulio Benetti #include <linux/input/mt.h>
13aa2f62cfSGiulio Benetti #include <linux/input/touchscreen.h>
14aa2f62cfSGiulio Benetti #include <linux/irq.h>
15aa2f62cfSGiulio Benetti #include <linux/regulator/consumer.h>
16aa2f62cfSGiulio Benetti #include <linux/regmap.h>
17aa2f62cfSGiulio Benetti
18aa2f62cfSGiulio Benetti #include <asm/unaligned.h>
19aa2f62cfSGiulio Benetti
20aa2f62cfSGiulio Benetti #define HY46XX_CHKSUM_CODE 0x1
21aa2f62cfSGiulio Benetti #define HY46XX_FINGER_NUM 0x2
22aa2f62cfSGiulio Benetti #define HY46XX_CHKSUM_LEN 0x7
23aa2f62cfSGiulio Benetti #define HY46XX_THRESHOLD 0x80
24aa2f62cfSGiulio Benetti #define HY46XX_GLOVE_EN 0x84
25aa2f62cfSGiulio Benetti #define HY46XX_REPORT_SPEED 0x88
26aa2f62cfSGiulio Benetti #define HY46XX_PWR_NOISE_EN 0x89
27aa2f62cfSGiulio Benetti #define HY46XX_FILTER_DATA 0x8A
28aa2f62cfSGiulio Benetti #define HY46XX_GAIN 0x92
29aa2f62cfSGiulio Benetti #define HY46XX_EDGE_OFFSET 0x93
30aa2f62cfSGiulio Benetti #define HY46XX_RX_NR_USED 0x94
31aa2f62cfSGiulio Benetti #define HY46XX_TX_NR_USED 0x95
32aa2f62cfSGiulio Benetti #define HY46XX_PWR_MODE 0xA5
33aa2f62cfSGiulio Benetti #define HY46XX_FW_VERSION 0xA6
34aa2f62cfSGiulio Benetti #define HY46XX_LIB_VERSION 0xA7
35aa2f62cfSGiulio Benetti #define HY46XX_TP_INFO 0xA8
36aa2f62cfSGiulio Benetti #define HY46XX_TP_CHIP_ID 0xA9
37aa2f62cfSGiulio Benetti #define HY46XX_BOOT_VER 0xB0
38aa2f62cfSGiulio Benetti
39aa2f62cfSGiulio Benetti #define HY46XX_TPLEN 0x6
40aa2f62cfSGiulio Benetti #define HY46XX_REPORT_PKT_LEN 0x44
41aa2f62cfSGiulio Benetti
42aa2f62cfSGiulio Benetti #define HY46XX_MAX_SUPPORTED_POINTS 11
43aa2f62cfSGiulio Benetti
44aa2f62cfSGiulio Benetti #define TOUCH_EVENT_DOWN 0x00
45aa2f62cfSGiulio Benetti #define TOUCH_EVENT_UP 0x01
46aa2f62cfSGiulio Benetti #define TOUCH_EVENT_CONTACT 0x02
47aa2f62cfSGiulio Benetti #define TOUCH_EVENT_RESERVED 0x03
48aa2f62cfSGiulio Benetti
49aa2f62cfSGiulio Benetti struct hycon_hy46xx_data {
50aa2f62cfSGiulio Benetti struct i2c_client *client;
51aa2f62cfSGiulio Benetti struct input_dev *input;
52aa2f62cfSGiulio Benetti struct touchscreen_properties prop;
53aa2f62cfSGiulio Benetti struct regulator *vcc;
54aa2f62cfSGiulio Benetti
55aa2f62cfSGiulio Benetti struct gpio_desc *reset_gpio;
56aa2f62cfSGiulio Benetti
57aa2f62cfSGiulio Benetti struct mutex mutex;
58aa2f62cfSGiulio Benetti struct regmap *regmap;
59aa2f62cfSGiulio Benetti
60aa2f62cfSGiulio Benetti int threshold;
61aa2f62cfSGiulio Benetti bool glove_enable;
62aa2f62cfSGiulio Benetti int report_speed;
63aa2f62cfSGiulio Benetti bool noise_filter_enable;
64aa2f62cfSGiulio Benetti int filter_data;
65aa2f62cfSGiulio Benetti int gain;
66aa2f62cfSGiulio Benetti int edge_offset;
67aa2f62cfSGiulio Benetti int rx_number_used;
68aa2f62cfSGiulio Benetti int tx_number_used;
69aa2f62cfSGiulio Benetti int power_mode;
70aa2f62cfSGiulio Benetti int fw_version;
71aa2f62cfSGiulio Benetti int lib_version;
72aa2f62cfSGiulio Benetti int tp_information;
73aa2f62cfSGiulio Benetti int tp_chip_id;
74aa2f62cfSGiulio Benetti int bootloader_version;
75aa2f62cfSGiulio Benetti };
76aa2f62cfSGiulio Benetti
77aa2f62cfSGiulio Benetti static const struct regmap_config hycon_hy46xx_i2c_regmap_config = {
78aa2f62cfSGiulio Benetti .reg_bits = 8,
79aa2f62cfSGiulio Benetti .val_bits = 8,
80aa2f62cfSGiulio Benetti };
81aa2f62cfSGiulio Benetti
hycon_hy46xx_check_checksum(struct hycon_hy46xx_data * tsdata,u8 * buf)82aa2f62cfSGiulio Benetti static bool hycon_hy46xx_check_checksum(struct hycon_hy46xx_data *tsdata, u8 *buf)
83aa2f62cfSGiulio Benetti {
84aa2f62cfSGiulio Benetti u8 chksum = 0;
85aa2f62cfSGiulio Benetti int i;
86aa2f62cfSGiulio Benetti
87aa2f62cfSGiulio Benetti for (i = 2; i < buf[HY46XX_CHKSUM_LEN]; i++)
88aa2f62cfSGiulio Benetti chksum += buf[i];
89aa2f62cfSGiulio Benetti
90aa2f62cfSGiulio Benetti if (chksum == buf[HY46XX_CHKSUM_CODE])
91aa2f62cfSGiulio Benetti return true;
92aa2f62cfSGiulio Benetti
93aa2f62cfSGiulio Benetti dev_err_ratelimited(&tsdata->client->dev,
94aa2f62cfSGiulio Benetti "checksum error: 0x%02x expected, got 0x%02x\n",
95aa2f62cfSGiulio Benetti chksum, buf[HY46XX_CHKSUM_CODE]);
96aa2f62cfSGiulio Benetti
97aa2f62cfSGiulio Benetti return false;
98aa2f62cfSGiulio Benetti }
99aa2f62cfSGiulio Benetti
hycon_hy46xx_isr(int irq,void * dev_id)100aa2f62cfSGiulio Benetti static irqreturn_t hycon_hy46xx_isr(int irq, void *dev_id)
101aa2f62cfSGiulio Benetti {
102aa2f62cfSGiulio Benetti struct hycon_hy46xx_data *tsdata = dev_id;
103aa2f62cfSGiulio Benetti struct device *dev = &tsdata->client->dev;
104aa2f62cfSGiulio Benetti u8 rdbuf[HY46XX_REPORT_PKT_LEN];
105aa2f62cfSGiulio Benetti int i, x, y, id;
106aa2f62cfSGiulio Benetti int error;
107aa2f62cfSGiulio Benetti
108aa2f62cfSGiulio Benetti memset(rdbuf, 0, sizeof(rdbuf));
109aa2f62cfSGiulio Benetti
110aa2f62cfSGiulio Benetti error = regmap_bulk_read(tsdata->regmap, 0, rdbuf, sizeof(rdbuf));
111aa2f62cfSGiulio Benetti if (error) {
112aa2f62cfSGiulio Benetti dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
113aa2f62cfSGiulio Benetti error);
114aa2f62cfSGiulio Benetti goto out;
115aa2f62cfSGiulio Benetti }
116aa2f62cfSGiulio Benetti
117aa2f62cfSGiulio Benetti if (!hycon_hy46xx_check_checksum(tsdata, rdbuf))
118aa2f62cfSGiulio Benetti goto out;
119aa2f62cfSGiulio Benetti
120aa2f62cfSGiulio Benetti for (i = 0; i < HY46XX_MAX_SUPPORTED_POINTS; i++) {
121aa2f62cfSGiulio Benetti u8 *buf = &rdbuf[3 + (HY46XX_TPLEN * i)];
122aa2f62cfSGiulio Benetti int type = buf[0] >> 6;
123aa2f62cfSGiulio Benetti
124aa2f62cfSGiulio Benetti if (type == TOUCH_EVENT_RESERVED)
125aa2f62cfSGiulio Benetti continue;
126aa2f62cfSGiulio Benetti
127aa2f62cfSGiulio Benetti x = get_unaligned_be16(buf) & 0x0fff;
128aa2f62cfSGiulio Benetti y = get_unaligned_be16(buf + 2) & 0x0fff;
129aa2f62cfSGiulio Benetti
130aa2f62cfSGiulio Benetti id = buf[2] >> 4;
131aa2f62cfSGiulio Benetti
132aa2f62cfSGiulio Benetti input_mt_slot(tsdata->input, id);
133aa2f62cfSGiulio Benetti if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
134aa2f62cfSGiulio Benetti type != TOUCH_EVENT_UP))
135aa2f62cfSGiulio Benetti touchscreen_report_pos(tsdata->input, &tsdata->prop,
136aa2f62cfSGiulio Benetti x, y, true);
137aa2f62cfSGiulio Benetti }
138aa2f62cfSGiulio Benetti
139aa2f62cfSGiulio Benetti input_mt_report_pointer_emulation(tsdata->input, false);
140aa2f62cfSGiulio Benetti input_sync(tsdata->input);
141aa2f62cfSGiulio Benetti
142aa2f62cfSGiulio Benetti out:
143aa2f62cfSGiulio Benetti return IRQ_HANDLED;
144aa2f62cfSGiulio Benetti }
145aa2f62cfSGiulio Benetti
146aa2f62cfSGiulio Benetti struct hycon_hy46xx_attribute {
147aa2f62cfSGiulio Benetti struct device_attribute dattr;
148aa2f62cfSGiulio Benetti size_t field_offset;
149aa2f62cfSGiulio Benetti u8 address;
150aa2f62cfSGiulio Benetti u8 limit_low;
151aa2f62cfSGiulio Benetti u8 limit_high;
152aa2f62cfSGiulio Benetti };
153aa2f62cfSGiulio Benetti
154aa2f62cfSGiulio Benetti #define HYCON_ATTR_U8(_field, _mode, _address, _limit_low, _limit_high) \
155aa2f62cfSGiulio Benetti struct hycon_hy46xx_attribute hycon_hy46xx_attr_##_field = { \
156aa2f62cfSGiulio Benetti .dattr = __ATTR(_field, _mode, \
157aa2f62cfSGiulio Benetti hycon_hy46xx_setting_show, \
158aa2f62cfSGiulio Benetti hycon_hy46xx_setting_store), \
159aa2f62cfSGiulio Benetti .field_offset = offsetof(struct hycon_hy46xx_data, _field), \
160aa2f62cfSGiulio Benetti .address = _address, \
161aa2f62cfSGiulio Benetti .limit_low = _limit_low, \
162aa2f62cfSGiulio Benetti .limit_high = _limit_high, \
163aa2f62cfSGiulio Benetti }
164aa2f62cfSGiulio Benetti
165aa2f62cfSGiulio Benetti #define HYCON_ATTR_BOOL(_field, _mode, _address) \
166aa2f62cfSGiulio Benetti struct hycon_hy46xx_attribute hycon_hy46xx_attr_##_field = { \
167aa2f62cfSGiulio Benetti .dattr = __ATTR(_field, _mode, \
168aa2f62cfSGiulio Benetti hycon_hy46xx_setting_show, \
169aa2f62cfSGiulio Benetti hycon_hy46xx_setting_store), \
170aa2f62cfSGiulio Benetti .field_offset = offsetof(struct hycon_hy46xx_data, _field), \
171aa2f62cfSGiulio Benetti .address = _address, \
172aa2f62cfSGiulio Benetti .limit_low = false, \
173aa2f62cfSGiulio Benetti .limit_high = true, \
174aa2f62cfSGiulio Benetti }
175aa2f62cfSGiulio Benetti
hycon_hy46xx_setting_show(struct device * dev,struct device_attribute * dattr,char * buf)176aa2f62cfSGiulio Benetti static ssize_t hycon_hy46xx_setting_show(struct device *dev,
177aa2f62cfSGiulio Benetti struct device_attribute *dattr, char *buf)
178aa2f62cfSGiulio Benetti {
179aa2f62cfSGiulio Benetti struct i2c_client *client = to_i2c_client(dev);
180aa2f62cfSGiulio Benetti struct hycon_hy46xx_data *tsdata = i2c_get_clientdata(client);
181aa2f62cfSGiulio Benetti struct hycon_hy46xx_attribute *attr =
182aa2f62cfSGiulio Benetti container_of(dattr, struct hycon_hy46xx_attribute, dattr);
183aa2f62cfSGiulio Benetti u8 *field = (u8 *)tsdata + attr->field_offset;
184aa2f62cfSGiulio Benetti size_t count = 0;
185aa2f62cfSGiulio Benetti int error = 0;
186aa2f62cfSGiulio Benetti int val;
187aa2f62cfSGiulio Benetti
188aa2f62cfSGiulio Benetti mutex_lock(&tsdata->mutex);
189aa2f62cfSGiulio Benetti
190aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, attr->address, &val);
191aa2f62cfSGiulio Benetti if (error < 0) {
192aa2f62cfSGiulio Benetti dev_err(&tsdata->client->dev,
193aa2f62cfSGiulio Benetti "Failed to fetch attribute %s, error %d\n",
194aa2f62cfSGiulio Benetti dattr->attr.name, error);
195aa2f62cfSGiulio Benetti goto out;
196aa2f62cfSGiulio Benetti }
197aa2f62cfSGiulio Benetti
198aa2f62cfSGiulio Benetti if (val != *field) {
199aa2f62cfSGiulio Benetti dev_warn(&tsdata->client->dev,
200aa2f62cfSGiulio Benetti "%s: read (%d) and stored value (%d) differ\n",
201aa2f62cfSGiulio Benetti dattr->attr.name, val, *field);
202aa2f62cfSGiulio Benetti *field = val;
203aa2f62cfSGiulio Benetti }
204aa2f62cfSGiulio Benetti
205aa2f62cfSGiulio Benetti count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
206aa2f62cfSGiulio Benetti
207aa2f62cfSGiulio Benetti out:
208aa2f62cfSGiulio Benetti mutex_unlock(&tsdata->mutex);
209aa2f62cfSGiulio Benetti return error ?: count;
210aa2f62cfSGiulio Benetti }
211aa2f62cfSGiulio Benetti
hycon_hy46xx_setting_store(struct device * dev,struct device_attribute * dattr,const char * buf,size_t count)212aa2f62cfSGiulio Benetti static ssize_t hycon_hy46xx_setting_store(struct device *dev,
213aa2f62cfSGiulio Benetti struct device_attribute *dattr,
214aa2f62cfSGiulio Benetti const char *buf, size_t count)
215aa2f62cfSGiulio Benetti {
216aa2f62cfSGiulio Benetti struct i2c_client *client = to_i2c_client(dev);
217aa2f62cfSGiulio Benetti struct hycon_hy46xx_data *tsdata = i2c_get_clientdata(client);
218aa2f62cfSGiulio Benetti struct hycon_hy46xx_attribute *attr =
219aa2f62cfSGiulio Benetti container_of(dattr, struct hycon_hy46xx_attribute, dattr);
220aa2f62cfSGiulio Benetti u8 *field = (u8 *)tsdata + attr->field_offset;
221aa2f62cfSGiulio Benetti unsigned int val;
222aa2f62cfSGiulio Benetti int error;
223aa2f62cfSGiulio Benetti
224aa2f62cfSGiulio Benetti mutex_lock(&tsdata->mutex);
225aa2f62cfSGiulio Benetti
226aa2f62cfSGiulio Benetti error = kstrtouint(buf, 0, &val);
227aa2f62cfSGiulio Benetti if (error)
228aa2f62cfSGiulio Benetti goto out;
229aa2f62cfSGiulio Benetti
230aa2f62cfSGiulio Benetti if (val < attr->limit_low || val > attr->limit_high) {
231aa2f62cfSGiulio Benetti error = -ERANGE;
232aa2f62cfSGiulio Benetti goto out;
233aa2f62cfSGiulio Benetti }
234aa2f62cfSGiulio Benetti
235aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, attr->address, val);
236aa2f62cfSGiulio Benetti if (error < 0) {
237aa2f62cfSGiulio Benetti dev_err(&tsdata->client->dev,
238aa2f62cfSGiulio Benetti "Failed to update attribute %s, error: %d\n",
239aa2f62cfSGiulio Benetti dattr->attr.name, error);
240aa2f62cfSGiulio Benetti goto out;
241aa2f62cfSGiulio Benetti }
242aa2f62cfSGiulio Benetti *field = val;
243aa2f62cfSGiulio Benetti
244aa2f62cfSGiulio Benetti out:
245aa2f62cfSGiulio Benetti mutex_unlock(&tsdata->mutex);
246aa2f62cfSGiulio Benetti return error ?: count;
247aa2f62cfSGiulio Benetti }
248aa2f62cfSGiulio Benetti
249aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(threshold, 0644, HY46XX_THRESHOLD, 0, 255);
250aa2f62cfSGiulio Benetti static HYCON_ATTR_BOOL(glove_enable, 0644, HY46XX_GLOVE_EN);
251aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(report_speed, 0644, HY46XX_REPORT_SPEED, 0, 255);
252aa2f62cfSGiulio Benetti static HYCON_ATTR_BOOL(noise_filter_enable, 0644, HY46XX_PWR_NOISE_EN);
253aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(filter_data, 0644, HY46XX_FILTER_DATA, 0, 5);
254aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(gain, 0644, HY46XX_GAIN, 0, 5);
255aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(edge_offset, 0644, HY46XX_EDGE_OFFSET, 0, 5);
256aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(fw_version, 0444, HY46XX_FW_VERSION, 0, 255);
257aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(lib_version, 0444, HY46XX_LIB_VERSION, 0, 255);
258aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(tp_information, 0444, HY46XX_TP_INFO, 0, 255);
259aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(tp_chip_id, 0444, HY46XX_TP_CHIP_ID, 0, 255);
260aa2f62cfSGiulio Benetti static HYCON_ATTR_U8(bootloader_version, 0444, HY46XX_BOOT_VER, 0, 255);
261aa2f62cfSGiulio Benetti
262aa2f62cfSGiulio Benetti static struct attribute *hycon_hy46xx_attrs[] = {
263aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_threshold.dattr.attr,
264aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_glove_enable.dattr.attr,
265aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_report_speed.dattr.attr,
266aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_noise_filter_enable.dattr.attr,
267aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_filter_data.dattr.attr,
268aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_gain.dattr.attr,
269aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_edge_offset.dattr.attr,
270aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_fw_version.dattr.attr,
271aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_lib_version.dattr.attr,
272aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_tp_information.dattr.attr,
273aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_tp_chip_id.dattr.attr,
274aa2f62cfSGiulio Benetti &hycon_hy46xx_attr_bootloader_version.dattr.attr,
275aa2f62cfSGiulio Benetti NULL
276aa2f62cfSGiulio Benetti };
277aa2f62cfSGiulio Benetti
278aa2f62cfSGiulio Benetti static const struct attribute_group hycon_hy46xx_attr_group = {
279aa2f62cfSGiulio Benetti .attrs = hycon_hy46xx_attrs,
280aa2f62cfSGiulio Benetti };
281aa2f62cfSGiulio Benetti
hycon_hy46xx_get_defaults(struct device * dev,struct hycon_hy46xx_data * tsdata)282aa2f62cfSGiulio Benetti static void hycon_hy46xx_get_defaults(struct device *dev, struct hycon_hy46xx_data *tsdata)
283aa2f62cfSGiulio Benetti {
284aa2f62cfSGiulio Benetti bool val_bool;
285aa2f62cfSGiulio Benetti int error;
286aa2f62cfSGiulio Benetti u32 val;
287aa2f62cfSGiulio Benetti
288aa2f62cfSGiulio Benetti error = device_property_read_u32(dev, "hycon,threshold", &val);
289aa2f62cfSGiulio Benetti if (!error) {
290aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_THRESHOLD, val);
291aa2f62cfSGiulio Benetti if (error < 0)
292aa2f62cfSGiulio Benetti goto out;
293aa2f62cfSGiulio Benetti
294aa2f62cfSGiulio Benetti tsdata->threshold = val;
295aa2f62cfSGiulio Benetti }
296aa2f62cfSGiulio Benetti
297aa2f62cfSGiulio Benetti val_bool = device_property_read_bool(dev, "hycon,glove-enable");
298aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_GLOVE_EN, val_bool);
299aa2f62cfSGiulio Benetti if (error < 0)
300aa2f62cfSGiulio Benetti goto out;
301aa2f62cfSGiulio Benetti tsdata->glove_enable = val_bool;
302aa2f62cfSGiulio Benetti
303aa2f62cfSGiulio Benetti error = device_property_read_u32(dev, "hycon,report-speed-hz", &val);
304aa2f62cfSGiulio Benetti if (!error) {
305aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_REPORT_SPEED, val);
306aa2f62cfSGiulio Benetti if (error < 0)
307aa2f62cfSGiulio Benetti goto out;
308aa2f62cfSGiulio Benetti
309aa2f62cfSGiulio Benetti tsdata->report_speed = val;
310aa2f62cfSGiulio Benetti }
311aa2f62cfSGiulio Benetti
312aa2f62cfSGiulio Benetti val_bool = device_property_read_bool(dev, "hycon,noise-filter-enable");
313aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_PWR_NOISE_EN, val_bool);
314aa2f62cfSGiulio Benetti if (error < 0)
315aa2f62cfSGiulio Benetti goto out;
316aa2f62cfSGiulio Benetti tsdata->noise_filter_enable = val_bool;
317aa2f62cfSGiulio Benetti
318aa2f62cfSGiulio Benetti error = device_property_read_u32(dev, "hycon,filter-data", &val);
319aa2f62cfSGiulio Benetti if (!error) {
320aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_FILTER_DATA, val);
321aa2f62cfSGiulio Benetti if (error < 0)
322aa2f62cfSGiulio Benetti goto out;
323aa2f62cfSGiulio Benetti
324aa2f62cfSGiulio Benetti tsdata->filter_data = val;
325aa2f62cfSGiulio Benetti }
326aa2f62cfSGiulio Benetti
327aa2f62cfSGiulio Benetti error = device_property_read_u32(dev, "hycon,gain", &val);
328aa2f62cfSGiulio Benetti if (!error) {
329aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_GAIN, val);
330aa2f62cfSGiulio Benetti if (error < 0)
331aa2f62cfSGiulio Benetti goto out;
332aa2f62cfSGiulio Benetti
333aa2f62cfSGiulio Benetti tsdata->gain = val;
334aa2f62cfSGiulio Benetti }
335aa2f62cfSGiulio Benetti
336aa2f62cfSGiulio Benetti error = device_property_read_u32(dev, "hycon,edge-offset", &val);
337aa2f62cfSGiulio Benetti if (!error) {
338aa2f62cfSGiulio Benetti error = regmap_write(tsdata->regmap, HY46XX_EDGE_OFFSET, val);
339aa2f62cfSGiulio Benetti if (error < 0)
340aa2f62cfSGiulio Benetti goto out;
341aa2f62cfSGiulio Benetti
342aa2f62cfSGiulio Benetti tsdata->edge_offset = val;
343aa2f62cfSGiulio Benetti }
344aa2f62cfSGiulio Benetti
345aa2f62cfSGiulio Benetti return;
346aa2f62cfSGiulio Benetti out:
347aa2f62cfSGiulio Benetti dev_err(&tsdata->client->dev, "Failed to set default settings");
348aa2f62cfSGiulio Benetti }
349aa2f62cfSGiulio Benetti
hycon_hy46xx_get_parameters(struct hycon_hy46xx_data * tsdata)350aa2f62cfSGiulio Benetti static void hycon_hy46xx_get_parameters(struct hycon_hy46xx_data *tsdata)
351aa2f62cfSGiulio Benetti {
352aa2f62cfSGiulio Benetti int error;
353aa2f62cfSGiulio Benetti u32 val;
354aa2f62cfSGiulio Benetti
355aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_THRESHOLD, &val);
356aa2f62cfSGiulio Benetti if (error < 0)
357aa2f62cfSGiulio Benetti goto out;
358aa2f62cfSGiulio Benetti tsdata->threshold = val;
359aa2f62cfSGiulio Benetti
360aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_GLOVE_EN, &val);
361aa2f62cfSGiulio Benetti if (error < 0)
362aa2f62cfSGiulio Benetti goto out;
363aa2f62cfSGiulio Benetti tsdata->glove_enable = val;
364aa2f62cfSGiulio Benetti
365aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_REPORT_SPEED, &val);
366aa2f62cfSGiulio Benetti if (error < 0)
367aa2f62cfSGiulio Benetti goto out;
368aa2f62cfSGiulio Benetti tsdata->report_speed = val;
369aa2f62cfSGiulio Benetti
370aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_PWR_NOISE_EN, &val);
371aa2f62cfSGiulio Benetti if (error < 0)
372aa2f62cfSGiulio Benetti goto out;
373aa2f62cfSGiulio Benetti tsdata->noise_filter_enable = val;
374aa2f62cfSGiulio Benetti
375aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_FILTER_DATA, &val);
376aa2f62cfSGiulio Benetti if (error < 0)
377aa2f62cfSGiulio Benetti goto out;
378aa2f62cfSGiulio Benetti tsdata->filter_data = val;
379aa2f62cfSGiulio Benetti
380aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_GAIN, &val);
381aa2f62cfSGiulio Benetti if (error < 0)
382aa2f62cfSGiulio Benetti goto out;
383aa2f62cfSGiulio Benetti tsdata->gain = val;
384aa2f62cfSGiulio Benetti
385aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_EDGE_OFFSET, &val);
386aa2f62cfSGiulio Benetti if (error < 0)
387aa2f62cfSGiulio Benetti goto out;
388aa2f62cfSGiulio Benetti tsdata->edge_offset = val;
389aa2f62cfSGiulio Benetti
390aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_RX_NR_USED, &val);
391aa2f62cfSGiulio Benetti if (error < 0)
392aa2f62cfSGiulio Benetti goto out;
393aa2f62cfSGiulio Benetti tsdata->rx_number_used = val;
394aa2f62cfSGiulio Benetti
395aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_TX_NR_USED, &val);
396aa2f62cfSGiulio Benetti if (error < 0)
397aa2f62cfSGiulio Benetti goto out;
398aa2f62cfSGiulio Benetti tsdata->tx_number_used = val;
399aa2f62cfSGiulio Benetti
400aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_PWR_MODE, &val);
401aa2f62cfSGiulio Benetti if (error < 0)
402aa2f62cfSGiulio Benetti goto out;
403aa2f62cfSGiulio Benetti tsdata->power_mode = val;
404aa2f62cfSGiulio Benetti
405aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_FW_VERSION, &val);
406aa2f62cfSGiulio Benetti if (error < 0)
407aa2f62cfSGiulio Benetti goto out;
408aa2f62cfSGiulio Benetti tsdata->fw_version = val;
409aa2f62cfSGiulio Benetti
410aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_LIB_VERSION, &val);
411aa2f62cfSGiulio Benetti if (error < 0)
412aa2f62cfSGiulio Benetti goto out;
413aa2f62cfSGiulio Benetti tsdata->lib_version = val;
414aa2f62cfSGiulio Benetti
415aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_TP_INFO, &val);
416aa2f62cfSGiulio Benetti if (error < 0)
417aa2f62cfSGiulio Benetti goto out;
418aa2f62cfSGiulio Benetti tsdata->tp_information = val;
419aa2f62cfSGiulio Benetti
420aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_TP_CHIP_ID, &val);
421aa2f62cfSGiulio Benetti if (error < 0)
422aa2f62cfSGiulio Benetti goto out;
423aa2f62cfSGiulio Benetti tsdata->tp_chip_id = val;
424aa2f62cfSGiulio Benetti
425aa2f62cfSGiulio Benetti error = regmap_read(tsdata->regmap, HY46XX_BOOT_VER, &val);
426aa2f62cfSGiulio Benetti if (error < 0)
427aa2f62cfSGiulio Benetti goto out;
428aa2f62cfSGiulio Benetti tsdata->bootloader_version = val;
429aa2f62cfSGiulio Benetti
430aa2f62cfSGiulio Benetti return;
431aa2f62cfSGiulio Benetti out:
432aa2f62cfSGiulio Benetti dev_err(&tsdata->client->dev, "Failed to read default settings");
433aa2f62cfSGiulio Benetti }
434aa2f62cfSGiulio Benetti
hycon_hy46xx_disable_regulator(void * arg)435aa2f62cfSGiulio Benetti static void hycon_hy46xx_disable_regulator(void *arg)
436aa2f62cfSGiulio Benetti {
437aa2f62cfSGiulio Benetti struct hycon_hy46xx_data *data = arg;
438aa2f62cfSGiulio Benetti
439aa2f62cfSGiulio Benetti regulator_disable(data->vcc);
440aa2f62cfSGiulio Benetti }
441aa2f62cfSGiulio Benetti
hycon_hy46xx_probe(struct i2c_client * client)442cb812d39SUwe Kleine-König static int hycon_hy46xx_probe(struct i2c_client *client)
443aa2f62cfSGiulio Benetti {
444aa2f62cfSGiulio Benetti struct hycon_hy46xx_data *tsdata;
445aa2f62cfSGiulio Benetti struct input_dev *input;
446aa2f62cfSGiulio Benetti int error;
447aa2f62cfSGiulio Benetti
448aa2f62cfSGiulio Benetti dev_dbg(&client->dev, "probing for HYCON HY46XX I2C\n");
449aa2f62cfSGiulio Benetti
450aa2f62cfSGiulio Benetti tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
451aa2f62cfSGiulio Benetti if (!tsdata)
452aa2f62cfSGiulio Benetti return -ENOMEM;
453aa2f62cfSGiulio Benetti
454aa2f62cfSGiulio Benetti tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
455aa2f62cfSGiulio Benetti if (IS_ERR(tsdata->vcc)) {
456aa2f62cfSGiulio Benetti error = PTR_ERR(tsdata->vcc);
457aa2f62cfSGiulio Benetti if (error != -EPROBE_DEFER)
458aa2f62cfSGiulio Benetti dev_err(&client->dev,
459aa2f62cfSGiulio Benetti "failed to request regulator: %d\n", error);
460aa2f62cfSGiulio Benetti return error;
461aa2f62cfSGiulio Benetti }
462aa2f62cfSGiulio Benetti
463aa2f62cfSGiulio Benetti error = regulator_enable(tsdata->vcc);
464aa2f62cfSGiulio Benetti if (error < 0) {
465aa2f62cfSGiulio Benetti dev_err(&client->dev, "failed to enable vcc: %d\n", error);
466aa2f62cfSGiulio Benetti return error;
467aa2f62cfSGiulio Benetti }
468aa2f62cfSGiulio Benetti
469aa2f62cfSGiulio Benetti error = devm_add_action_or_reset(&client->dev,
470aa2f62cfSGiulio Benetti hycon_hy46xx_disable_regulator,
471aa2f62cfSGiulio Benetti tsdata);
472aa2f62cfSGiulio Benetti if (error)
473aa2f62cfSGiulio Benetti return error;
474aa2f62cfSGiulio Benetti
475aa2f62cfSGiulio Benetti tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
476aa2f62cfSGiulio Benetti "reset", GPIOD_OUT_LOW);
477aa2f62cfSGiulio Benetti if (IS_ERR(tsdata->reset_gpio)) {
478aa2f62cfSGiulio Benetti error = PTR_ERR(tsdata->reset_gpio);
479aa2f62cfSGiulio Benetti dev_err(&client->dev,
480aa2f62cfSGiulio Benetti "Failed to request GPIO reset pin, error %d\n", error);
481aa2f62cfSGiulio Benetti return error;
482aa2f62cfSGiulio Benetti }
483aa2f62cfSGiulio Benetti
484aa2f62cfSGiulio Benetti if (tsdata->reset_gpio) {
485aa2f62cfSGiulio Benetti usleep_range(5000, 6000);
486aa2f62cfSGiulio Benetti gpiod_set_value_cansleep(tsdata->reset_gpio, 1);
487aa2f62cfSGiulio Benetti usleep_range(5000, 6000);
488aa2f62cfSGiulio Benetti gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
489aa2f62cfSGiulio Benetti msleep(1000);
490aa2f62cfSGiulio Benetti }
491aa2f62cfSGiulio Benetti
492aa2f62cfSGiulio Benetti input = devm_input_allocate_device(&client->dev);
493aa2f62cfSGiulio Benetti if (!input) {
494aa2f62cfSGiulio Benetti dev_err(&client->dev, "failed to allocate input device.\n");
495aa2f62cfSGiulio Benetti return -ENOMEM;
496aa2f62cfSGiulio Benetti }
497aa2f62cfSGiulio Benetti
498aa2f62cfSGiulio Benetti mutex_init(&tsdata->mutex);
499aa2f62cfSGiulio Benetti tsdata->client = client;
500aa2f62cfSGiulio Benetti tsdata->input = input;
501aa2f62cfSGiulio Benetti
502aa2f62cfSGiulio Benetti tsdata->regmap = devm_regmap_init_i2c(client,
503aa2f62cfSGiulio Benetti &hycon_hy46xx_i2c_regmap_config);
504aa2f62cfSGiulio Benetti if (IS_ERR(tsdata->regmap)) {
505aa2f62cfSGiulio Benetti dev_err(&client->dev, "regmap allocation failed\n");
506aa2f62cfSGiulio Benetti return PTR_ERR(tsdata->regmap);
507aa2f62cfSGiulio Benetti }
508aa2f62cfSGiulio Benetti
509aa2f62cfSGiulio Benetti hycon_hy46xx_get_defaults(&client->dev, tsdata);
510aa2f62cfSGiulio Benetti hycon_hy46xx_get_parameters(tsdata);
511aa2f62cfSGiulio Benetti
512aa2f62cfSGiulio Benetti input->name = "Hycon Capacitive Touch";
513aa2f62cfSGiulio Benetti input->id.bustype = BUS_I2C;
514aa2f62cfSGiulio Benetti input->dev.parent = &client->dev;
515aa2f62cfSGiulio Benetti
516aa2f62cfSGiulio Benetti input_set_abs_params(input, ABS_MT_POSITION_X, 0, -1, 0, 0);
517aa2f62cfSGiulio Benetti input_set_abs_params(input, ABS_MT_POSITION_Y, 0, -1, 0, 0);
518aa2f62cfSGiulio Benetti
519aa2f62cfSGiulio Benetti touchscreen_parse_properties(input, true, &tsdata->prop);
520aa2f62cfSGiulio Benetti
521aa2f62cfSGiulio Benetti error = input_mt_init_slots(input, HY46XX_MAX_SUPPORTED_POINTS,
522aa2f62cfSGiulio Benetti INPUT_MT_DIRECT);
523aa2f62cfSGiulio Benetti if (error) {
524aa2f62cfSGiulio Benetti dev_err(&client->dev, "Unable to init MT slots.\n");
525aa2f62cfSGiulio Benetti return error;
526aa2f62cfSGiulio Benetti }
527aa2f62cfSGiulio Benetti
528aa2f62cfSGiulio Benetti i2c_set_clientdata(client, tsdata);
529aa2f62cfSGiulio Benetti
530aa2f62cfSGiulio Benetti error = devm_request_threaded_irq(&client->dev, client->irq,
531aa2f62cfSGiulio Benetti NULL, hycon_hy46xx_isr, IRQF_ONESHOT,
532aa2f62cfSGiulio Benetti client->name, tsdata);
533aa2f62cfSGiulio Benetti if (error) {
534aa2f62cfSGiulio Benetti dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
535aa2f62cfSGiulio Benetti return error;
536aa2f62cfSGiulio Benetti }
537aa2f62cfSGiulio Benetti
538aa2f62cfSGiulio Benetti error = devm_device_add_group(&client->dev, &hycon_hy46xx_attr_group);
539aa2f62cfSGiulio Benetti if (error)
540aa2f62cfSGiulio Benetti return error;
541aa2f62cfSGiulio Benetti
542aa2f62cfSGiulio Benetti error = input_register_device(input);
543aa2f62cfSGiulio Benetti if (error)
544aa2f62cfSGiulio Benetti return error;
545aa2f62cfSGiulio Benetti
546aa2f62cfSGiulio Benetti dev_dbg(&client->dev,
547aa2f62cfSGiulio Benetti "HYCON HY46XX initialized: IRQ %d, Reset pin %d.\n",
548aa2f62cfSGiulio Benetti client->irq,
549aa2f62cfSGiulio Benetti tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
550aa2f62cfSGiulio Benetti
551aa2f62cfSGiulio Benetti return 0;
552aa2f62cfSGiulio Benetti }
553aa2f62cfSGiulio Benetti
554aa2f62cfSGiulio Benetti static const struct i2c_device_id hycon_hy46xx_id[] = {
555aa2f62cfSGiulio Benetti { .name = "hy4613" },
556aa2f62cfSGiulio Benetti { .name = "hy4614" },
557aa2f62cfSGiulio Benetti { .name = "hy4621" },
558aa2f62cfSGiulio Benetti { .name = "hy4623" },
559aa2f62cfSGiulio Benetti { .name = "hy4633" },
560aa2f62cfSGiulio Benetti { .name = "hy4635" },
561aa2f62cfSGiulio Benetti { /* sentinel */ }
562aa2f62cfSGiulio Benetti };
563aa2f62cfSGiulio Benetti MODULE_DEVICE_TABLE(i2c, hycon_hy46xx_id);
564aa2f62cfSGiulio Benetti
565aa2f62cfSGiulio Benetti static const struct of_device_id hycon_hy46xx_of_match[] = {
566aa2f62cfSGiulio Benetti { .compatible = "hycon,hy4613" },
567aa2f62cfSGiulio Benetti { .compatible = "hycon,hy4614" },
568aa2f62cfSGiulio Benetti { .compatible = "hycon,hy4621" },
569aa2f62cfSGiulio Benetti { .compatible = "hycon,hy4623" },
570aa2f62cfSGiulio Benetti { .compatible = "hycon,hy4633" },
571aa2f62cfSGiulio Benetti { .compatible = "hycon,hy4635" },
572aa2f62cfSGiulio Benetti { /* sentinel */ }
573aa2f62cfSGiulio Benetti };
574aa2f62cfSGiulio Benetti MODULE_DEVICE_TABLE(of, hycon_hy46xx_of_match);
575aa2f62cfSGiulio Benetti
576aa2f62cfSGiulio Benetti static struct i2c_driver hycon_hy46xx_driver = {
577aa2f62cfSGiulio Benetti .driver = {
578aa2f62cfSGiulio Benetti .name = "hycon_hy46xx",
579aa2f62cfSGiulio Benetti .of_match_table = hycon_hy46xx_of_match,
580aa2f62cfSGiulio Benetti .probe_type = PROBE_PREFER_ASYNCHRONOUS,
581aa2f62cfSGiulio Benetti },
582aa2f62cfSGiulio Benetti .id_table = hycon_hy46xx_id,
583*d8bde56dSUwe Kleine-König .probe = hycon_hy46xx_probe,
584aa2f62cfSGiulio Benetti };
585aa2f62cfSGiulio Benetti
586aa2f62cfSGiulio Benetti module_i2c_driver(hycon_hy46xx_driver);
587aa2f62cfSGiulio Benetti
588aa2f62cfSGiulio Benetti MODULE_AUTHOR("Giulio Benetti <giulio.benetti@benettiengineering.com>");
589aa2f62cfSGiulio Benetti MODULE_DESCRIPTION("HYCON HY46XX I2C Touchscreen Driver");
590aa2f62cfSGiulio Benetti MODULE_LICENSE("GPL v2");
591