1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Driver for cypress touch screen controller |
4 | * |
5 | * Copyright (c) 2009 Aava Mobile |
6 | * |
7 | * Some cleanups by Alan Cox <alan@linux.intel.com> |
8 | */ |
9 | |
10 | #include <linux/i2c.h> |
11 | #include <linux/input.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/gpio/consumer.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> |
16 | #include <linux/slab.h> |
17 | #include <asm/byteorder.h> |
18 | |
19 | #define CY8CTMG110_DRIVER_NAME "cy8ctmg110" |
20 | |
21 | /* Touch coordinates */ |
22 | #define CY8CTMG110_X_MIN 0 |
23 | #define CY8CTMG110_Y_MIN 0 |
24 | #define CY8CTMG110_X_MAX 759 |
25 | #define CY8CTMG110_Y_MAX 465 |
26 | |
27 | |
28 | /* cy8ctmg110 register definitions */ |
29 | #define CY8CTMG110_TOUCH_WAKEUP_TIME 0 |
30 | #define CY8CTMG110_TOUCH_SLEEP_TIME 2 |
31 | #define CY8CTMG110_TOUCH_X1 3 |
32 | #define CY8CTMG110_TOUCH_Y1 5 |
33 | #define CY8CTMG110_TOUCH_X2 7 |
34 | #define CY8CTMG110_TOUCH_Y2 9 |
35 | #define CY8CTMG110_FINGERS 11 |
36 | #define CY8CTMG110_GESTURE 12 |
37 | #define CY8CTMG110_REG_MAX 13 |
38 | |
39 | |
40 | /* |
41 | * The touch driver structure. |
42 | */ |
43 | struct cy8ctmg110 { |
44 | struct input_dev *input; |
45 | char phys[32]; |
46 | struct i2c_client *client; |
47 | struct gpio_desc *reset_gpio; |
48 | }; |
49 | |
50 | /* |
51 | * cy8ctmg110_power is the routine that is called when touch hardware |
52 | * is being powered off or on. When powering on this routine de-asserts |
53 | * the RESET line, when powering off reset line is asserted. |
54 | */ |
55 | static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron) |
56 | { |
57 | if (ts->reset_gpio) |
58 | gpiod_set_value_cansleep(desc: ts->reset_gpio, value: !poweron); |
59 | } |
60 | |
61 | static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg, |
62 | unsigned char len, unsigned char *value) |
63 | { |
64 | struct i2c_client *client = tsc->client; |
65 | int ret; |
66 | unsigned char i2c_data[6]; |
67 | |
68 | BUG_ON(len > 5); |
69 | |
70 | i2c_data[0] = reg; |
71 | memcpy(i2c_data + 1, value, len); |
72 | |
73 | ret = i2c_master_send(client, buf: i2c_data, count: len + 1); |
74 | if (ret != len + 1) { |
75 | dev_err(&client->dev, "i2c write data cmd failed\n" ); |
76 | return ret < 0 ? ret : -EIO; |
77 | } |
78 | |
79 | return 0; |
80 | } |
81 | |
82 | static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc, |
83 | unsigned char *data, unsigned char len, unsigned char cmd) |
84 | { |
85 | struct i2c_client *client = tsc->client; |
86 | int ret; |
87 | struct i2c_msg msg[2] = { |
88 | /* first write slave position to i2c devices */ |
89 | { |
90 | .addr = client->addr, |
91 | .len = 1, |
92 | .buf = &cmd |
93 | }, |
94 | /* Second read data from position */ |
95 | { |
96 | .addr = client->addr, |
97 | .flags = I2C_M_RD, |
98 | .len = len, |
99 | .buf = data |
100 | } |
101 | }; |
102 | |
103 | ret = i2c_transfer(adap: client->adapter, msgs: msg, num: 2); |
104 | if (ret < 0) |
105 | return ret; |
106 | |
107 | return 0; |
108 | } |
109 | |
110 | static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc) |
111 | { |
112 | struct input_dev *input = tsc->input; |
113 | unsigned char reg_p[CY8CTMG110_REG_MAX]; |
114 | |
115 | memset(reg_p, 0, CY8CTMG110_REG_MAX); |
116 | |
117 | /* Reading coordinates */ |
118 | if (cy8ctmg110_read_regs(tsc, data: reg_p, len: 9, CY8CTMG110_TOUCH_X1) != 0) |
119 | return -EIO; |
120 | |
121 | /* Number of touch */ |
122 | if (reg_p[8] == 0) { |
123 | input_report_key(dev: input, BTN_TOUCH, value: 0); |
124 | } else { |
125 | input_report_key(dev: input, BTN_TOUCH, value: 1); |
126 | input_report_abs(dev: input, ABS_X, |
127 | be16_to_cpup(p: (__be16 *)(reg_p + 0))); |
128 | input_report_abs(dev: input, ABS_Y, |
129 | be16_to_cpup(p: (__be16 *)(reg_p + 2))); |
130 | } |
131 | |
132 | input_sync(dev: input); |
133 | |
134 | return 0; |
135 | } |
136 | |
137 | static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep) |
138 | { |
139 | unsigned char reg_p[3]; |
140 | |
141 | if (sleep) { |
142 | reg_p[0] = 0x00; |
143 | reg_p[1] = 0xff; |
144 | reg_p[2] = 5; |
145 | } else { |
146 | reg_p[0] = 0x10; |
147 | reg_p[1] = 0xff; |
148 | reg_p[2] = 0; |
149 | } |
150 | |
151 | return cy8ctmg110_write_regs(tsc: ts, CY8CTMG110_TOUCH_WAKEUP_TIME, len: 3, value: reg_p); |
152 | } |
153 | |
154 | static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id) |
155 | { |
156 | struct cy8ctmg110 *tsc = dev_id; |
157 | |
158 | cy8ctmg110_touch_pos(tsc); |
159 | |
160 | return IRQ_HANDLED; |
161 | } |
162 | |
163 | static void cy8ctmg110_shut_off(void *_ts) |
164 | { |
165 | struct cy8ctmg110 *ts = _ts; |
166 | |
167 | cy8ctmg110_set_sleepmode(ts, sleep: true); |
168 | cy8ctmg110_power(ts, poweron: false); |
169 | } |
170 | |
171 | static int cy8ctmg110_probe(struct i2c_client *client) |
172 | { |
173 | struct cy8ctmg110 *ts; |
174 | struct input_dev *input_dev; |
175 | int err; |
176 | |
177 | if (!i2c_check_functionality(adap: client->adapter, |
178 | I2C_FUNC_SMBUS_READ_WORD_DATA)) |
179 | return -EIO; |
180 | |
181 | ts = devm_kzalloc(dev: &client->dev, size: sizeof(*ts), GFP_KERNEL); |
182 | if (!ts) |
183 | return -ENOMEM; |
184 | |
185 | input_dev = devm_input_allocate_device(&client->dev); |
186 | if (!input_dev) |
187 | return -ENOMEM; |
188 | |
189 | ts->client = client; |
190 | ts->input = input_dev; |
191 | |
192 | snprintf(buf: ts->phys, size: sizeof(ts->phys), |
193 | fmt: "%s/input0" , dev_name(dev: &client->dev)); |
194 | |
195 | input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen" ; |
196 | input_dev->phys = ts->phys; |
197 | input_dev->id.bustype = BUS_I2C; |
198 | |
199 | input_set_capability(dev: input_dev, EV_KEY, BTN_TOUCH); |
200 | input_set_abs_params(dev: input_dev, ABS_X, |
201 | CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, fuzz: 4, flat: 0); |
202 | input_set_abs_params(dev: input_dev, ABS_Y, |
203 | CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, fuzz: 4, flat: 0); |
204 | |
205 | /* Request and assert reset line */ |
206 | ts->reset_gpio = devm_gpiod_get_optional(dev: &client->dev, NULL, |
207 | flags: GPIOD_OUT_HIGH); |
208 | if (IS_ERR(ptr: ts->reset_gpio)) { |
209 | err = PTR_ERR(ptr: ts->reset_gpio); |
210 | dev_err(&client->dev, |
211 | "Unable to request reset GPIO: %d\n" , err); |
212 | return err; |
213 | } |
214 | |
215 | cy8ctmg110_power(ts, poweron: true); |
216 | cy8ctmg110_set_sleepmode(ts, sleep: false); |
217 | |
218 | err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts); |
219 | if (err) |
220 | return err; |
221 | |
222 | err = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
223 | NULL, thread_fn: cy8ctmg110_irq_thread, |
224 | IRQF_ONESHOT, devname: "touch_reset_key" , dev_id: ts); |
225 | if (err) { |
226 | dev_err(&client->dev, |
227 | "irq %d busy? error %d\n" , client->irq, err); |
228 | return err; |
229 | } |
230 | |
231 | err = input_register_device(input_dev); |
232 | if (err) |
233 | return err; |
234 | |
235 | i2c_set_clientdata(client, data: ts); |
236 | |
237 | return 0; |
238 | } |
239 | |
240 | static int cy8ctmg110_suspend(struct device *dev) |
241 | { |
242 | struct i2c_client *client = to_i2c_client(dev); |
243 | struct cy8ctmg110 *ts = i2c_get_clientdata(client); |
244 | |
245 | if (!device_may_wakeup(dev: &client->dev)) { |
246 | cy8ctmg110_set_sleepmode(ts, sleep: true); |
247 | cy8ctmg110_power(ts, poweron: false); |
248 | } |
249 | |
250 | return 0; |
251 | } |
252 | |
253 | static int cy8ctmg110_resume(struct device *dev) |
254 | { |
255 | struct i2c_client *client = to_i2c_client(dev); |
256 | struct cy8ctmg110 *ts = i2c_get_clientdata(client); |
257 | |
258 | if (!device_may_wakeup(dev: &client->dev)) { |
259 | cy8ctmg110_power(ts, poweron: true); |
260 | cy8ctmg110_set_sleepmode(ts, sleep: false); |
261 | } |
262 | |
263 | return 0; |
264 | } |
265 | |
266 | static DEFINE_SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, |
267 | cy8ctmg110_suspend, cy8ctmg110_resume); |
268 | |
269 | static const struct i2c_device_id cy8ctmg110_idtable[] = { |
270 | { CY8CTMG110_DRIVER_NAME, 1 }, |
271 | { } |
272 | }; |
273 | |
274 | MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable); |
275 | |
276 | static struct i2c_driver cy8ctmg110_driver = { |
277 | .driver = { |
278 | .name = CY8CTMG110_DRIVER_NAME, |
279 | .pm = pm_sleep_ptr(&cy8ctmg110_pm), |
280 | }, |
281 | .id_table = cy8ctmg110_idtable, |
282 | .probe = cy8ctmg110_probe, |
283 | }; |
284 | |
285 | module_i2c_driver(cy8ctmg110_driver); |
286 | |
287 | MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>" ); |
288 | MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver" ); |
289 | MODULE_LICENSE("GPL v2" ); |
290 | |