This source file includes following definitions.
- eeti_ts_report_event
- eeti_ts_read
- eeti_ts_isr
- eeti_ts_start
- eeti_ts_stop
- eeti_ts_open
- eeti_ts_close
- eeti_ts_probe
- eeti_ts_suspend
- eeti_ts_resume
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14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/input.h>
17 #include <linux/input/touchscreen.h>
18 #include <linux/interrupt.h>
19 #include <linux/i2c.h>
20 #include <linux/timer.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/of.h>
23 #include <linux/slab.h>
24 #include <asm/unaligned.h>
25
26 struct eeti_ts {
27 struct i2c_client *client;
28 struct input_dev *input;
29 struct gpio_desc *attn_gpio;
30 struct touchscreen_properties props;
31 struct mutex mutex;
32 bool running;
33 };
34
35 #define EETI_TS_BITDEPTH (11)
36 #define EETI_MAXVAL ((1 << (EETI_TS_BITDEPTH + 1)) - 1)
37
38 #define REPORT_BIT_PRESSED BIT(0)
39 #define REPORT_BIT_AD0 BIT(1)
40 #define REPORT_BIT_AD1 BIT(2)
41 #define REPORT_BIT_HAS_PRESSURE BIT(6)
42 #define REPORT_RES_BITS(v) (((v) >> 1) + EETI_TS_BITDEPTH)
43
44 static void eeti_ts_report_event(struct eeti_ts *eeti, u8 *buf)
45 {
46 unsigned int res;
47 u16 x, y;
48
49 res = REPORT_RES_BITS(buf[0] & (REPORT_BIT_AD0 | REPORT_BIT_AD1));
50
51 x = get_unaligned_be16(&buf[1]);
52 y = get_unaligned_be16(&buf[3]);
53
54
55 x >>= res - EETI_TS_BITDEPTH;
56 y >>= res - EETI_TS_BITDEPTH;
57
58 if (buf[0] & REPORT_BIT_HAS_PRESSURE)
59 input_report_abs(eeti->input, ABS_PRESSURE, buf[5]);
60
61 touchscreen_report_pos(eeti->input, &eeti->props, x, y, false);
62 input_report_key(eeti->input, BTN_TOUCH, buf[0] & REPORT_BIT_PRESSED);
63 input_sync(eeti->input);
64 }
65
66 static int eeti_ts_read(struct eeti_ts *eeti)
67 {
68 int len, error;
69 char buf[6];
70
71 len = i2c_master_recv(eeti->client, buf, sizeof(buf));
72 if (len != sizeof(buf)) {
73 error = len < 0 ? len : -EIO;
74 dev_err(&eeti->client->dev,
75 "failed to read touchscreen data: %d\n",
76 error);
77 return error;
78 }
79
80
81 if (buf[0] & 0x80)
82 eeti_ts_report_event(eeti, buf);
83
84 return 0;
85 }
86
87 static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
88 {
89 struct eeti_ts *eeti = dev_id;
90 int error;
91
92 mutex_lock(&eeti->mutex);
93
94 do {
95
96
97
98
99
100
101 if (eeti->attn_gpio &&
102 !gpiod_get_value_cansleep(eeti->attn_gpio)) {
103 break;
104 }
105
106 error = eeti_ts_read(eeti);
107 if (error)
108 break;
109
110 } while (eeti->running && eeti->attn_gpio);
111
112 mutex_unlock(&eeti->mutex);
113 return IRQ_HANDLED;
114 }
115
116 static void eeti_ts_start(struct eeti_ts *eeti)
117 {
118 mutex_lock(&eeti->mutex);
119
120 eeti->running = true;
121 enable_irq(eeti->client->irq);
122
123
124
125
126
127
128 if (eeti->attn_gpio && gpiod_get_value_cansleep(eeti->attn_gpio))
129 eeti_ts_read(eeti);
130
131 mutex_unlock(&eeti->mutex);
132 }
133
134 static void eeti_ts_stop(struct eeti_ts *eeti)
135 {
136
137
138
139
140 eeti->running = false;
141 wmb();
142 disable_irq(eeti->client->irq);
143 }
144
145 static int eeti_ts_open(struct input_dev *dev)
146 {
147 struct eeti_ts *eeti = input_get_drvdata(dev);
148
149 eeti_ts_start(eeti);
150
151 return 0;
152 }
153
154 static void eeti_ts_close(struct input_dev *dev)
155 {
156 struct eeti_ts *eeti = input_get_drvdata(dev);
157
158 eeti_ts_stop(eeti);
159 }
160
161 static int eeti_ts_probe(struct i2c_client *client,
162 const struct i2c_device_id *idp)
163 {
164 struct device *dev = &client->dev;
165 struct eeti_ts *eeti;
166 struct input_dev *input;
167 int error;
168
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174
175
176 eeti = devm_kzalloc(dev, sizeof(*eeti), GFP_KERNEL);
177 if (!eeti) {
178 dev_err(dev, "failed to allocate driver data\n");
179 return -ENOMEM;
180 }
181
182 mutex_init(&eeti->mutex);
183
184 input = devm_input_allocate_device(dev);
185 if (!input) {
186 dev_err(dev, "Failed to allocate input device.\n");
187 return -ENOMEM;
188 }
189
190 input_set_capability(input, EV_KEY, BTN_TOUCH);
191
192 input_set_abs_params(input, ABS_X, 0, EETI_MAXVAL, 0, 0);
193 input_set_abs_params(input, ABS_Y, 0, EETI_MAXVAL, 0, 0);
194 input_set_abs_params(input, ABS_PRESSURE, 0, 0xff, 0, 0);
195
196 touchscreen_parse_properties(input, false, &eeti->props);
197
198 input->name = client->name;
199 input->id.bustype = BUS_I2C;
200 input->open = eeti_ts_open;
201 input->close = eeti_ts_close;
202
203 eeti->client = client;
204 eeti->input = input;
205
206 eeti->attn_gpio = devm_gpiod_get_optional(dev, "attn", GPIOD_IN);
207 if (IS_ERR(eeti->attn_gpio))
208 return PTR_ERR(eeti->attn_gpio);
209
210 i2c_set_clientdata(client, eeti);
211 input_set_drvdata(input, eeti);
212
213 error = devm_request_threaded_irq(dev, client->irq,
214 NULL, eeti_ts_isr,
215 IRQF_ONESHOT,
216 client->name, eeti);
217 if (error) {
218 dev_err(dev, "Unable to request touchscreen IRQ: %d\n",
219 error);
220 return error;
221 }
222
223
224
225
226
227 eeti_ts_stop(eeti);
228
229 error = input_register_device(input);
230 if (error)
231 return error;
232
233 return 0;
234 }
235
236 static int __maybe_unused eeti_ts_suspend(struct device *dev)
237 {
238 struct i2c_client *client = to_i2c_client(dev);
239 struct eeti_ts *eeti = i2c_get_clientdata(client);
240 struct input_dev *input_dev = eeti->input;
241
242 mutex_lock(&input_dev->mutex);
243
244 if (input_dev->users)
245 eeti_ts_stop(eeti);
246
247 mutex_unlock(&input_dev->mutex);
248
249 if (device_may_wakeup(&client->dev))
250 enable_irq_wake(client->irq);
251
252 return 0;
253 }
254
255 static int __maybe_unused eeti_ts_resume(struct device *dev)
256 {
257 struct i2c_client *client = to_i2c_client(dev);
258 struct eeti_ts *eeti = i2c_get_clientdata(client);
259 struct input_dev *input_dev = eeti->input;
260
261 if (device_may_wakeup(&client->dev))
262 disable_irq_wake(client->irq);
263
264 mutex_lock(&input_dev->mutex);
265
266 if (input_dev->users)
267 eeti_ts_start(eeti);
268
269 mutex_unlock(&input_dev->mutex);
270
271 return 0;
272 }
273
274 static SIMPLE_DEV_PM_OPS(eeti_ts_pm, eeti_ts_suspend, eeti_ts_resume);
275
276 static const struct i2c_device_id eeti_ts_id[] = {
277 { "eeti_ts", 0 },
278 { }
279 };
280 MODULE_DEVICE_TABLE(i2c, eeti_ts_id);
281
282 #ifdef CONFIG_OF
283 static const struct of_device_id of_eeti_ts_match[] = {
284 { .compatible = "eeti,exc3000-i2c", },
285 { }
286 };
287 #endif
288
289 static struct i2c_driver eeti_ts_driver = {
290 .driver = {
291 .name = "eeti_ts",
292 .pm = &eeti_ts_pm,
293 .of_match_table = of_match_ptr(of_eeti_ts_match),
294 },
295 .probe = eeti_ts_probe,
296 .id_table = eeti_ts_id,
297 };
298
299 module_i2c_driver(eeti_ts_driver);
300
301 MODULE_DESCRIPTION("EETI Touchscreen driver");
302 MODULE_AUTHOR("Daniel Mack <daniel@zonque.org>");
303 MODULE_LICENSE("GPL");