1 /*
2 * Copyright (c) 2025 Qingsong Gou <gouqs@hotmail.com>
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT focaltech_ft6146
8
9 #include <zephyr/kernel.h>
10 #include <zephyr/drivers/i2c.h>
11 #include <zephyr/drivers/gpio.h>
12 #include <zephyr/input/input.h>
13 #include <zephyr/input/input_touch.h>
14 #include <zephyr/logging/log.h>
15
16 LOG_MODULE_REGISTER(ft6146, CONFIG_INPUT_LOG_LEVEL);
17
18 /* FT6146 register definitions */
19 #define FT6146_REG_DEVICE_MODE 0x00
20 #define FT6146_REG_GEST_ID 0x01
21 #define FT6146_REG_TD_STATUS 0x02
22 #define FT6146_REG_P1_XH 0x03
23 #define FT6146_REG_P1_XL 0x04
24 #define FT6146_REG_P1_YH 0x05
25 #define FT6146_REG_P1_YL 0x06
26 #define FT6146_REG_P1_WEIGHT 0x07
27 #define FT6146_REG_P1_MISC 0x08
28 #define FT6146_REG_P2_XH 0x09
29 #define FT6146_REG_P2_XL 0x0A
30 #define FT6146_REG_P2_YH 0x0B
31 #define FT6146_REG_P2_YL 0x0C
32 #define FT6146_REG_P2_WEIGHT 0x0D
33 #define FT6146_REG_P2_MISC 0x0E
34 #define FT6146_REG_THRESHOLD 0x80
35 #define FT6146_REG_FILTER_COE 0x85
36 #define FT6146_REG_CTRL 0x86
37 #define FT6146_REG_TIMEENTERMONITOR 0x87
38 #define FT6146_REG_PERIODACTIVE 0x88
39 #define FT6146_REG_PERIODMONITOR 0x89
40 #define FT6146_REG_RADIAN_VALUE 0x91
41 #define FT6146_REG_OFFSET_LEFT_RIGHT 0x92
42 #define FT6146_REG_OFFSET_UP_DOWN 0x93
43 #define FT6146_REG_DIST_LEFT_RIGHT 0x94
44 #define FT6146_REG_DIST_UP_DOWN 0x95
45 #define FT6146_REG_ZOOM_DIS_SQR 0x96
46 #define FT6146_REG_RADIAN_THRESHOLD 0x97
47 #define FT6146_REG_SMALL_OBJECT_THRESHOLD 0x98
48
49 /* Device mode values */
50 #define FT6146_DEVICE_MODE_NORMAL 0x00
51 #define FT6146_DEVICE_MODE_TEST 0x04
52 #define FT6146_DEVICE_MODE_SYSTEM 0x01
53
54 /* Gesture IDs */
55 #define FT6146_GESTURE_NO_GESTURE 0x00
56 #define FT6146_GESTURE_MOVE_UP 0x10
57 #define FT6146_GESTURE_MOVE_RIGHT 0x14
58 #define FT6146_GESTURE_MOVE_DOWN 0x18
59 #define FT6146_GESTURE_MOVE_LEFT 0x1C
60 #define FT6146_GESTURE_ZOOM_IN 0x48
61 #define FT6146_GESTURE_ZOOM_OUT 0x49
62
63 /* Reset timing */
64 #define FT6146_RESET_DELAY_MS 10
65 #define FT6146_POST_RESET_DELAY_MS 100
66
67 #define CTP_DOWN (0U)
68 #define CTP_UP (1U)
69 #define CTP_MOVE (2U)
70 #define CTP_RESERVE (3U)
71
72 #define POSITION_H_MSK 0x0FU
73 #define EVENT_FLAG_MASK 0xC0U
74
75 struct ft6146_data {
76 const struct device *dev;
77 struct gpio_callback int_cb;
78 struct k_work work;
79 struct k_timer poll_timer;
80 };
81
82 struct ft6146_config {
83 struct input_touchscreen_common_config common;
84 struct i2c_dt_spec i2c;
85 struct gpio_dt_spec reset_gpio;
86 #ifdef CONFIG_INPUT_FT6146_INTERRUPT
87 struct gpio_dt_spec int_gpio;
88 #endif
89 };
90
91 INPUT_TOUCH_STRUCT_CHECK(struct ft6146_config);
92
ft6146_process_touch(const struct device * dev,uint8_t status)93 static void ft6146_process_touch(const struct device *dev, uint8_t status)
94 {
95 const struct ft6146_config *config = dev->config;
96 uint8_t point_data[9];
97 uint8_t event_flag;
98 uint16_t x, y;
99 int ret;
100
101 /* Read touch data */
102 ret = i2c_burst_read_dt(&config->i2c, FT6146_REG_DEVICE_MODE, point_data,
103 sizeof(point_data));
104 if (ret < 0) {
105 LOG_ERR("Failed to read touch data: %d", ret);
106 return;
107 }
108
109 event_flag = FIELD_GET(EVENT_FLAG_MASK, point_data[FT6146_REG_P1_XH]);
110 x = ((point_data[FT6146_REG_P1_XH] & POSITION_H_MSK) << 8) + point_data[FT6146_REG_P1_XL];
111 y = ((point_data[FT6146_REG_P1_YH] & POSITION_H_MSK) << 8) + point_data[FT6146_REG_P1_YL];
112
113 LOG_DBG("event_flag:%d, x:%d, y:%d", event_flag, x, y);
114 if ((event_flag == CTP_DOWN) || (event_flag == CTP_MOVE)) {
115 input_touchscreen_report_pos(dev, x, y, K_FOREVER);
116 input_report_key(dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER);
117 } else if (event_flag == CTP_UP) {
118 input_report_key(dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER);
119 }
120 }
121
ft6146_work_handler(struct k_work * work)122 static void ft6146_work_handler(struct k_work *work)
123 {
124 struct ft6146_data *data = CONTAINER_OF(work, struct ft6146_data, work);
125 const struct device *dev = data->dev;
126
127 ft6146_process_touch(dev, 0);
128 }
129
130 #ifndef CONFIG_INPUT_FT6146_INTERRUPT
ft6146_poll_timer_handler(struct k_timer * timer)131 static void ft6146_poll_timer_handler(struct k_timer *timer)
132 {
133 struct ft6146_data *data = CONTAINER_OF(timer, struct ft6146_data, poll_timer);
134
135 k_work_submit(&data->work);
136 }
137 #else
ft6146_isr_handler(const struct device * dev,struct gpio_callback * cb,uint32_t pins)138 static void ft6146_isr_handler(const struct device *dev, struct gpio_callback *cb, uint32_t pins)
139 {
140 struct ft6146_data *data = CONTAINER_OF(cb, struct ft6146_data, int_cb);
141
142 k_work_submit(&data->work);
143 }
144 #endif
145
ft6146_reset(const struct device * dev)146 static int ft6146_reset(const struct device *dev)
147 {
148 const struct ft6146_config *config = dev->config;
149 int ret;
150
151 if (!config->reset_gpio.port) {
152 return 0;
153 }
154
155 if (!device_is_ready(config->reset_gpio.port)) {
156 LOG_ERR("Reset GPIO not ready");
157 return -ENODEV;
158 }
159
160 ret = gpio_pin_configure_dt(&config->reset_gpio, GPIO_OUTPUT_ACTIVE);
161 if (ret < 0) {
162 LOG_ERR("Failed to configure reset GPIO: %d", ret);
163 return ret;
164 }
165
166 k_msleep(FT6146_RESET_DELAY_MS);
167
168 /* De-assert reset */
169 ret = gpio_pin_set_dt(&config->reset_gpio, 0);
170 if (ret < 0) {
171 LOG_ERR("Failed to de-assert reset: %d", ret);
172 return ret;
173 }
174
175 k_msleep(FT6146_POST_RESET_DELAY_MS);
176
177 return ret;
178 }
179
ft6146_init(const struct device * dev)180 static int ft6146_init(const struct device *dev)
181 {
182 const struct ft6146_config *config = dev->config;
183 struct ft6146_data *data = dev->data;
184 int ret;
185
186 if (!i2c_is_ready_dt(&config->i2c)) {
187 LOG_ERR("I2C bus not ready");
188 return -ENODEV;
189 }
190
191 data->dev = dev;
192
193 /* Perform reset sequence */
194 ret = ft6146_reset(dev);
195 if (ret < 0) {
196 return ret;
197 }
198
199 /* Initialize work queue */
200 k_work_init(&data->work, ft6146_work_handler);
201
202 #ifdef CONFIG_INPUT_FT6146_INTERRUPT
203 if (!gpio_is_ready_dt(&config->int_gpio)) {
204 LOG_ERR("Interrupt GPIO controller device not ready");
205 return -ENODEV;
206 }
207
208 ret = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
209 if (ret < 0) {
210 LOG_ERR("Failed to configure interrupt GPIO: %d", ret);
211 return ret;
212 }
213
214 ret = gpio_pin_interrupt_configure_dt(&config->int_gpio, GPIO_INT_EDGE_TO_ACTIVE);
215 if (ret < 0) {
216 LOG_ERR("Failed to configure interrupt: %d", ret);
217 return ret;
218 }
219
220 gpio_init_callback(&data->int_cb, ft6146_isr_handler, BIT(config->int_gpio.pin));
221 ret = gpio_add_callback(config->int_gpio.port, &data->int_cb);
222 if (ret < 0) {
223 LOG_ERR("Failed to add callback: %d", ret);
224 return ret;
225 }
226 #else
227 /* Initialize polling timer */
228 k_timer_init(&data->poll_timer, ft6146_poll_timer_handler, NULL);
229 k_timer_start(&data->poll_timer, K_MSEC(CONFIG_INPUT_FT6146_PERIOD),
230 K_MSEC(CONFIG_INPUT_FT6146_PERIOD));
231 #endif
232
233 return ret;
234 }
235
236 #define FT6146_INIT(n) \
237 static struct ft6146_data ft6146_data_##n; \
238 \
239 static const struct ft6146_config ft6146_config_##n = { \
240 .common = INPUT_TOUCH_DT_INST_COMMON_CONFIG_INIT(n), \
241 .i2c = I2C_DT_SPEC_INST_GET(n), \
242 .reset_gpio = GPIO_DT_SPEC_INST_GET_OR(n, reset_gpios, {0}), \
243 COND_CODE_1(CONFIG_INPUT_FT6146_INTERRUPT, \
244 (.int_gpio = GPIO_DT_SPEC_INST_GET(n, int_gpios),), ()) }; \
245 \
246 DEVICE_DT_INST_DEFINE(n, ft6146_init, NULL, &ft6146_data_##n, &ft6146_config_##n, \
247 POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, NULL);
248
249 DT_INST_FOREACH_STATUS_OKAY(FT6146_INIT)
250
