1 // SPDX-License-Identifier: GPL-2.0-or-later
11 #include <linux/pwm.h>
15 #include <media/rc-core.h>
21 	struct pwm_device *pwm;  member
22 	struct hrtimer timer;  member
35 	pwm_enable(ir_rx51->pwm);  in ir_rx51_on()
40 	pwm_disable(ir_rx51->pwm);  in ir_rx51_off()
45 	struct pwm_device *pwm = ir_rx51->pwm;  in init_timing_params()  local
46 	int duty, period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, ir_rx51->freq);  in init_timing_params()
48 	duty = DIV_ROUND_CLOSEST(ir_rx51->duty_cycle * period, 100);  in init_timing_params()
50 	pwm_config(pwm, duty, period);  in init_timing_params()
55 static enum hrtimer_restart ir_rx51_timer_cb(struct hrtimer *timer)  in ir_rx51_timer_cb()  argument
57 	struct ir_rx51 *ir_rx51 = container_of(timer, struct ir_rx51, timer);  in ir_rx51_timer_cb()
60 	if (ir_rx51->wbuf_index < 0) {  in ir_rx51_timer_cb()
61 		dev_err_ratelimited(ir_rx51->dev,  in ir_rx51_timer_cb()
63 				    ir_rx51->wbuf_index);  in ir_rx51_timer_cb()
74 		if (ir_rx51->wbuf_index >= WBUF_LEN)  in ir_rx51_timer_cb()
76 		if (ir_rx51->wbuf[ir_rx51->wbuf_index] == -1)  in ir_rx51_timer_cb()
79 		if (ir_rx51->wbuf_index % 2)  in ir_rx51_timer_cb()
84 		ns = US_TO_NS(ir_rx51->wbuf[ir_rx51->wbuf_index]);  in ir_rx51_timer_cb()
85 		hrtimer_add_expires_ns(timer, ns);  in ir_rx51_timer_cb()
87 		ir_rx51->wbuf_index++;  in ir_rx51_timer_cb()
89 		now = timer->base->get_time();  in ir_rx51_timer_cb()
91 	} while (hrtimer_get_expires_tv64(timer) < now);  in ir_rx51_timer_cb()
97 	ir_rx51->wbuf_index = -1;  in ir_rx51_timer_cb()
99 	wake_up_interruptible(&ir_rx51->wqueue);  in ir_rx51_timer_cb()
107 	struct ir_rx51 *ir_rx51 = dev->priv;  in ir_rx51_tx()
110 		return -EINVAL;  in ir_rx51_tx()
112 	memcpy(ir_rx51->wbuf, buffer, count * sizeof(unsigned int));  in ir_rx51_tx()
115 	wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);  in ir_rx51_tx()
119 		ir_rx51->wbuf[count] = -1; /* Insert termination mark */  in ir_rx51_tx()
127 	ir_rx51->wbuf_index = 1;  in ir_rx51_tx()
128 	hrtimer_start(&ir_rx51->timer,  in ir_rx51_tx()
129 		      ns_to_ktime(US_TO_NS(ir_rx51->wbuf[0])),  in ir_rx51_tx()
135 	wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);  in ir_rx51_tx()
144 	struct ir_rx51 *ir_rx51 = dev->priv;  in ir_rx51_open()
146 	if (test_and_set_bit(1, &ir_rx51->device_is_open))  in ir_rx51_open()
147 		return -EBUSY;  in ir_rx51_open()
149 	ir_rx51->pwm = pwm_get(ir_rx51->dev, NULL);  in ir_rx51_open()
150 	if (IS_ERR(ir_rx51->pwm)) {  in ir_rx51_open()
151 		int res = PTR_ERR(ir_rx51->pwm);  in ir_rx51_open()
153 		dev_err(ir_rx51->dev, "pwm_get failed: %d\n", res);  in ir_rx51_open()
162 	struct ir_rx51 *ir_rx51 = dev->priv;  in ir_rx51_release()
164 	hrtimer_cancel(&ir_rx51->timer);  in ir_rx51_release()
166 	pwm_put(ir_rx51->pwm);  in ir_rx51_release()
168 	clear_bit(1, &ir_rx51->device_is_open);  in ir_rx51_release()
173 	.wbuf_index	= -1,
178 	struct ir_rx51 *ir_rx51 = dev->priv;  in ir_rx51_set_duty_cycle()
180 	ir_rx51->duty_cycle = duty;  in ir_rx51_set_duty_cycle()
187 	struct ir_rx51 *ir_rx51 = dev->priv;  in ir_rx51_set_tx_carrier()
190 		return -EINVAL;  in ir_rx51_set_tx_carrier()
192 	ir_rx51->freq = carrier;  in ir_rx51_set_tx_carrier()
210 		return -EAGAIN;  in ir_rx51_suspend()
231 	struct pwm_device *pwm;  in ir_rx51_probe()  local
234 	pwm = pwm_get(&dev->dev, NULL);  in ir_rx51_probe()
235 	if (IS_ERR(pwm)) {  in ir_rx51_probe()
236 		int err = PTR_ERR(pwm);  in ir_rx51_probe()
238 		if (err != -EPROBE_DEFER)  in ir_rx51_probe()
239 			dev_err(&dev->dev, "pwm_get failed: %d\n", err);  in ir_rx51_probe()
244 	ir_rx51.freq = DIV_ROUND_CLOSEST_ULL(pwm_get_period(pwm), NSEC_PER_SEC);  in ir_rx51_probe()
245 	pwm_put(pwm);  in ir_rx51_probe()
247 	hrtimer_init(&ir_rx51.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);  in ir_rx51_probe()
248 	ir_rx51.timer.function = ir_rx51_timer_cb;  in ir_rx51_probe()
250 	ir_rx51.dev = &dev->dev;  in ir_rx51_probe()
252 	rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW_TX);  in ir_rx51_probe()
254 		return -ENOMEM;  in ir_rx51_probe()
256 	rcdev->priv = &ir_rx51;  in ir_rx51_probe()
257 	rcdev->open = ir_rx51_open;  in ir_rx51_probe()
258 	rcdev->close = ir_rx51_release;  in ir_rx51_probe()
259 	rcdev->tx_ir = ir_rx51_tx;  in ir_rx51_probe()
260 	rcdev->s_tx_duty_cycle = ir_rx51_set_duty_cycle;  in ir_rx51_probe()
261 	rcdev->s_tx_carrier = ir_rx51_set_tx_carrier;  in ir_rx51_probe()
262 	rcdev->driver_name = KBUILD_MODNAME;  in ir_rx51_probe()
266 	return devm_rc_register_device(&dev->dev, ir_rx51.rcdev);  in ir_rx51_probe()
276 		.compatible = "nokia,n900-ir",