Lines Matching refs:encoder
59 static unsigned int rotary_encoder_get_state(struct rotary_encoder *encoder) in rotary_encoder_get_state() argument
64 for (i = 0; i < encoder->gpios->ndescs; ++i) { in rotary_encoder_get_state()
65 int val = gpiod_get_value_cansleep(encoder->gpios->desc[i]); in rotary_encoder_get_state()
68 if (encoder->encoding == ROTENC_GRAY && ret & 1) in rotary_encoder_get_state()
77 static void rotary_encoder_report_event(struct rotary_encoder *encoder) in rotary_encoder_report_event() argument
79 if (encoder->relative_axis) { in rotary_encoder_report_event()
80 input_report_rel(encoder->input, in rotary_encoder_report_event()
81 encoder->axis, encoder->dir); in rotary_encoder_report_event()
83 unsigned int pos = encoder->pos; in rotary_encoder_report_event()
85 if (encoder->dir < 0) { in rotary_encoder_report_event()
87 if (encoder->rollover) in rotary_encoder_report_event()
88 pos += encoder->steps; in rotary_encoder_report_event()
93 if (encoder->rollover || pos < encoder->steps) in rotary_encoder_report_event()
97 if (encoder->rollover) in rotary_encoder_report_event()
98 pos %= encoder->steps; in rotary_encoder_report_event()
100 encoder->pos = pos; in rotary_encoder_report_event()
101 input_report_abs(encoder->input, encoder->axis, encoder->pos); in rotary_encoder_report_event()
104 input_sync(encoder->input); in rotary_encoder_report_event()
109 struct rotary_encoder *encoder = dev_id; in rotary_encoder_irq() local
112 mutex_lock(&encoder->access_mutex); in rotary_encoder_irq()
114 state = rotary_encoder_get_state(encoder); in rotary_encoder_irq()
118 if (encoder->armed) { in rotary_encoder_irq()
119 rotary_encoder_report_event(encoder); in rotary_encoder_irq()
120 encoder->armed = false; in rotary_encoder_irq()
126 if (encoder->armed) in rotary_encoder_irq()
127 encoder->dir = 2 - state; in rotary_encoder_irq()
131 encoder->armed = true; in rotary_encoder_irq()
135 mutex_unlock(&encoder->access_mutex); in rotary_encoder_irq()
142 struct rotary_encoder *encoder = dev_id; in rotary_encoder_half_period_irq() local
145 mutex_lock(&encoder->access_mutex); in rotary_encoder_half_period_irq()
147 state = rotary_encoder_get_state(encoder); in rotary_encoder_half_period_irq()
150 encoder->dir = ((encoder->last_stable - state + 1) % 4) - 1; in rotary_encoder_half_period_irq()
152 if (state != encoder->last_stable) { in rotary_encoder_half_period_irq()
153 rotary_encoder_report_event(encoder); in rotary_encoder_half_period_irq()
154 encoder->last_stable = state; in rotary_encoder_half_period_irq()
158 mutex_unlock(&encoder->access_mutex); in rotary_encoder_half_period_irq()
165 struct rotary_encoder *encoder = dev_id; in rotary_encoder_quarter_period_irq() local
168 mutex_lock(&encoder->access_mutex); in rotary_encoder_quarter_period_irq()
170 state = rotary_encoder_get_state(encoder); in rotary_encoder_quarter_period_irq()
172 if ((encoder->last_stable + 1) % 4 == state) in rotary_encoder_quarter_period_irq()
173 encoder->dir = 1; in rotary_encoder_quarter_period_irq()
174 else if (encoder->last_stable == (state + 1) % 4) in rotary_encoder_quarter_period_irq()
175 encoder->dir = -1; in rotary_encoder_quarter_period_irq()
179 rotary_encoder_report_event(encoder); in rotary_encoder_quarter_period_irq()
182 encoder->last_stable = state; in rotary_encoder_quarter_period_irq()
183 mutex_unlock(&encoder->access_mutex); in rotary_encoder_quarter_period_irq()
191 struct rotary_encoder *encoder; in rotary_encoder_probe() local
198 encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL); in rotary_encoder_probe()
199 if (!encoder) in rotary_encoder_probe()
202 mutex_init(&encoder->access_mutex); in rotary_encoder_probe()
204 device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps); in rotary_encoder_probe()
220 encoder->rollover = in rotary_encoder_probe()
227 encoder->encoding = ROTENC_GRAY; in rotary_encoder_probe()
231 encoder->encoding = ROTENC_BINARY; in rotary_encoder_probe()
237 device_property_read_u32(dev, "linux,axis", &encoder->axis); in rotary_encoder_probe()
238 encoder->relative_axis = in rotary_encoder_probe()
241 encoder->gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN); in rotary_encoder_probe()
242 if (IS_ERR(encoder->gpios)) { in rotary_encoder_probe()
244 return PTR_ERR(encoder->gpios); in rotary_encoder_probe()
246 if (encoder->gpios->ndescs < 2) { in rotary_encoder_probe()
255 encoder->input = input; in rotary_encoder_probe()
261 if (encoder->relative_axis) in rotary_encoder_probe()
262 input_set_capability(input, EV_REL, encoder->axis); in rotary_encoder_probe()
265 encoder->axis, 0, encoder->steps, 0, 1); in rotary_encoder_probe()
267 switch (steps_per_period >> (encoder->gpios->ndescs - 2)) { in rotary_encoder_probe()
270 encoder->last_stable = rotary_encoder_get_state(encoder); in rotary_encoder_probe()
274 encoder->last_stable = rotary_encoder_get_state(encoder); in rotary_encoder_probe()
285 encoder->irq = in rotary_encoder_probe()
287 sizeof(*encoder->irq) * encoder->gpios->ndescs, in rotary_encoder_probe()
289 if (!encoder->irq) in rotary_encoder_probe()
292 for (i = 0; i < encoder->gpios->ndescs; ++i) { in rotary_encoder_probe()
293 encoder->irq[i] = gpiod_to_irq(encoder->gpios->desc[i]); in rotary_encoder_probe()
295 err = devm_request_threaded_irq(dev, encoder->irq[i], in rotary_encoder_probe()
299 DRV_NAME, encoder); in rotary_encoder_probe()
302 encoder->irq[i], i); in rotary_encoder_probe()
316 platform_set_drvdata(pdev, encoder); in rotary_encoder_probe()
323 struct rotary_encoder *encoder = dev_get_drvdata(dev); in rotary_encoder_suspend() local
327 for (i = 0; i < encoder->gpios->ndescs; ++i) in rotary_encoder_suspend()
328 enable_irq_wake(encoder->irq[i]); in rotary_encoder_suspend()
336 struct rotary_encoder *encoder = dev_get_drvdata(dev); in rotary_encoder_resume() local
340 for (i = 0; i < encoder->gpios->ndescs; ++i) in rotary_encoder_resume()
341 disable_irq_wake(encoder->irq[i]); in rotary_encoder_resume()