Lines Matching +full:rotary +full:- +full:encoder
1 // SPDX-License-Identifier: GPL-2.0-only
10 * A generic driver for rotary encoders connected to GPIO lines.
11 * See file:Documentation/input/devices/rotary-encoder.rst for more information
26 #define DRV_NAME "rotary-encoder"
51 signed char dir; /* 1 - clockwise, -1 - CCW */
56 static unsigned int rotary_encoder_get_state(struct rotary_encoder *encoder) in rotary_encoder_get_state() argument
61 for (i = 0; i < encoder->gpios->ndescs; ++i) { in rotary_encoder_get_state()
62 int val = gpiod_get_value_cansleep(encoder->gpios->desc[i]); in rotary_encoder_get_state()
65 if (encoder->encoding == ROTENC_GRAY && ret & 1) in rotary_encoder_get_state()
74 static void rotary_encoder_report_event(struct rotary_encoder *encoder) in rotary_encoder_report_event() argument
76 if (encoder->relative_axis) { in rotary_encoder_report_event()
77 input_report_rel(encoder->input, in rotary_encoder_report_event()
78 encoder->axis, encoder->dir); in rotary_encoder_report_event()
80 unsigned int pos = encoder->pos; in rotary_encoder_report_event()
82 if (encoder->dir < 0) { in rotary_encoder_report_event()
83 /* turning counter-clockwise */ in rotary_encoder_report_event()
84 if (encoder->rollover) in rotary_encoder_report_event()
85 pos += encoder->steps; in rotary_encoder_report_event()
87 pos--; in rotary_encoder_report_event()
90 if (encoder->rollover || pos < encoder->steps) in rotary_encoder_report_event()
94 if (encoder->rollover) in rotary_encoder_report_event()
95 pos %= encoder->steps; in rotary_encoder_report_event()
97 encoder->pos = pos; in rotary_encoder_report_event()
98 input_report_abs(encoder->input, encoder->axis, encoder->pos); in rotary_encoder_report_event()
101 input_sync(encoder->input); in rotary_encoder_report_event()
106 struct rotary_encoder *encoder = dev_id; in rotary_encoder_irq() local
109 guard(mutex)(&encoder->access_mutex); in rotary_encoder_irq()
111 state = rotary_encoder_get_state(encoder); in rotary_encoder_irq()
115 if (encoder->armed) { in rotary_encoder_irq()
116 rotary_encoder_report_event(encoder); in rotary_encoder_irq()
117 encoder->armed = false; in rotary_encoder_irq()
123 if (encoder->armed) in rotary_encoder_irq()
124 encoder->dir = 2 - state; in rotary_encoder_irq()
128 encoder->armed = true; in rotary_encoder_irq()
137 struct rotary_encoder *encoder = dev_id; in rotary_encoder_half_period_irq() local
140 guard(mutex)(&encoder->access_mutex); in rotary_encoder_half_period_irq()
142 state = rotary_encoder_get_state(encoder); in rotary_encoder_half_period_irq()
145 encoder->dir = ((encoder->last_stable - state + 1) % 4) - 1; in rotary_encoder_half_period_irq()
147 if (state != encoder->last_stable) { in rotary_encoder_half_period_irq()
148 rotary_encoder_report_event(encoder); in rotary_encoder_half_period_irq()
149 encoder->last_stable = state; in rotary_encoder_half_period_irq()
158 struct rotary_encoder *encoder = dev_id; in rotary_encoder_quarter_period_irq() local
161 guard(mutex)(&encoder->access_mutex); in rotary_encoder_quarter_period_irq()
163 state = rotary_encoder_get_state(encoder); in rotary_encoder_quarter_period_irq()
165 if ((encoder->last_stable + 1) % 4 == state) { in rotary_encoder_quarter_period_irq()
166 encoder->dir = 1; in rotary_encoder_quarter_period_irq()
167 rotary_encoder_report_event(encoder); in rotary_encoder_quarter_period_irq()
168 } else if (encoder->last_stable == (state + 1) % 4) { in rotary_encoder_quarter_period_irq()
169 encoder->dir = -1; in rotary_encoder_quarter_period_irq()
170 rotary_encoder_report_event(encoder); in rotary_encoder_quarter_period_irq()
173 encoder->last_stable = state; in rotary_encoder_quarter_period_irq()
180 struct device *dev = &pdev->dev; in rotary_encoder_probe()
181 struct rotary_encoder *encoder; in rotary_encoder_probe() local
188 encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL); in rotary_encoder_probe()
189 if (!encoder) in rotary_encoder_probe()
190 return -ENOMEM; in rotary_encoder_probe()
192 mutex_init(&encoder->access_mutex); in rotary_encoder_probe()
194 device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps); in rotary_encoder_probe()
196 err = device_property_read_u32(dev, "rotary-encoder,steps-per-period", in rotary_encoder_probe()
200 * The 'half-period' property has been deprecated, you must in rotary_encoder_probe()
201 * use 'steps-per-period' and set an appropriate value, but in rotary_encoder_probe()
207 "rotary-encoder,half-period") ? 2 : 1; in rotary_encoder_probe()
210 encoder->rollover = in rotary_encoder_probe()
211 device_property_read_bool(dev, "rotary-encoder,rollover"); in rotary_encoder_probe()
213 if (!device_property_present(dev, "rotary-encoder,encoding") || in rotary_encoder_probe()
214 !device_property_match_string(dev, "rotary-encoder,encoding", in rotary_encoder_probe()
217 encoder->encoding = ROTENC_GRAY; in rotary_encoder_probe()
218 } else if (!device_property_match_string(dev, "rotary-encoder,encoding", in rotary_encoder_probe()
221 encoder->encoding = ROTENC_BINARY; in rotary_encoder_probe()
224 return -EINVAL; in rotary_encoder_probe()
227 device_property_read_u32(dev, "linux,axis", &encoder->axis); in rotary_encoder_probe()
228 encoder->relative_axis = in rotary_encoder_probe()
229 device_property_read_bool(dev, "rotary-encoder,relative-axis"); in rotary_encoder_probe()
231 encoder->gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN); in rotary_encoder_probe()
232 if (IS_ERR(encoder->gpios)) in rotary_encoder_probe()
233 return dev_err_probe(dev, PTR_ERR(encoder->gpios), "unable to get gpios\n"); in rotary_encoder_probe()
234 if (encoder->gpios->ndescs < 2) { in rotary_encoder_probe()
236 return -EINVAL; in rotary_encoder_probe()
241 return -ENOMEM; in rotary_encoder_probe()
243 encoder->input = input; in rotary_encoder_probe()
245 input->name = pdev->name; in rotary_encoder_probe()
246 input->id.bustype = BUS_HOST; in rotary_encoder_probe()
248 if (encoder->relative_axis) in rotary_encoder_probe()
249 input_set_capability(input, EV_REL, encoder->axis); in rotary_encoder_probe()
252 encoder->axis, 0, encoder->steps, 0, 1); in rotary_encoder_probe()
254 switch (steps_per_period >> (encoder->gpios->ndescs - 2)) { in rotary_encoder_probe()
257 encoder->last_stable = rotary_encoder_get_state(encoder); in rotary_encoder_probe()
261 encoder->last_stable = rotary_encoder_get_state(encoder); in rotary_encoder_probe()
267 dev_err(dev, "'%d' is not a valid steps-per-period value\n", in rotary_encoder_probe()
269 return -EINVAL; in rotary_encoder_probe()
272 encoder->irq = in rotary_encoder_probe()
274 encoder->gpios->ndescs, sizeof(*encoder->irq), in rotary_encoder_probe()
276 if (!encoder->irq) in rotary_encoder_probe()
277 return -ENOMEM; in rotary_encoder_probe()
279 for (i = 0; i < encoder->gpios->ndescs; ++i) { in rotary_encoder_probe()
280 encoder->irq[i] = gpiod_to_irq(encoder->gpios->desc[i]); in rotary_encoder_probe()
282 err = devm_request_threaded_irq(dev, encoder->irq[i], in rotary_encoder_probe()
286 DRV_NAME, encoder); in rotary_encoder_probe()
289 encoder->irq[i], i); in rotary_encoder_probe()
301 device_property_read_bool(dev, "wakeup-source")); in rotary_encoder_probe()
303 platform_set_drvdata(pdev, encoder); in rotary_encoder_probe()
310 struct rotary_encoder *encoder = dev_get_drvdata(dev); in rotary_encoder_suspend() local
314 for (i = 0; i < encoder->gpios->ndescs; ++i) in rotary_encoder_suspend()
315 enable_irq_wake(encoder->irq[i]); in rotary_encoder_suspend()
323 struct rotary_encoder *encoder = dev_get_drvdata(dev); in rotary_encoder_resume() local
327 for (i = 0; i < encoder->gpios->ndescs; ++i) in rotary_encoder_resume()
328 disable_irq_wake(encoder->irq[i]); in rotary_encoder_resume()
339 { .compatible = "rotary-encoder", },
356 MODULE_DESCRIPTION("GPIO rotary encoder driver");