1 // SPDX-License-Identifier: GPL-2.0-or-later
8 #include <linux/pwm.h>
13 #include <media/rc-core.h>
15 #define DRIVER_NAME	"pwm-ir-tx"
16 #define DEVICE_NAME	"PWM IR Transmitter"
19 	struct pwm_device *pwm;  member
25 	{ .compatible = "pwm-ir-tx", },
32 	struct pwm_ir *pwm_ir = dev->priv;  in pwm_ir_set_duty_cycle()
34 	pwm_ir->duty_cycle = duty_cycle;  in pwm_ir_set_duty_cycle()
41 	struct pwm_ir *pwm_ir = dev->priv;  in pwm_ir_set_carrier()
44 		return -EINVAL;  in pwm_ir_set_carrier()
46 	pwm_ir->carrier = carrier;  in pwm_ir_set_carrier()
54 	struct pwm_ir *pwm_ir = dev->priv;  in pwm_ir_tx()
55 	struct pwm_device *pwm = pwm_ir->pwm;  in pwm_ir_tx()  local
61 	pwm_init_state(pwm, &state);  in pwm_ir_tx()
63 	state.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, pwm_ir->carrier);  in pwm_ir_tx()
64 	pwm_set_relative_duty_cycle(&state, pwm_ir->duty_cycle, 100);  in pwm_ir_tx()
70 		pwm_apply_might_sleep(pwm, &state);  in pwm_ir_tx()
79 	pwm_apply_might_sleep(pwm, &state);  in pwm_ir_tx()
90 	pwm_ir = devm_kmalloc(&pdev->dev, sizeof(*pwm_ir), GFP_KERNEL);  in pwm_ir_probe()
92 		return -ENOMEM;  in pwm_ir_probe()
94 	pwm_ir->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_ir_probe()
95 	if (IS_ERR(pwm_ir->pwm))  in pwm_ir_probe()
96 		return PTR_ERR(pwm_ir->pwm);  in pwm_ir_probe()
98 	pwm_ir->carrier = 38000;  in pwm_ir_probe()
99 	pwm_ir->duty_cycle = 50;  in pwm_ir_probe()
101 	rcdev = devm_rc_allocate_device(&pdev->dev, RC_DRIVER_IR_RAW_TX);  in pwm_ir_probe()
103 		return -ENOMEM;  in pwm_ir_probe()
105 	rcdev->priv = pwm_ir;  in pwm_ir_probe()
106 	rcdev->driver_name = DRIVER_NAME;  in pwm_ir_probe()
107 	rcdev->device_name = DEVICE_NAME;  in pwm_ir_probe()
108 	rcdev->tx_ir = pwm_ir_tx;  in pwm_ir_probe()
109 	rcdev->s_tx_duty_cycle = pwm_ir_set_duty_cycle;  in pwm_ir_probe()
110 	rcdev->s_tx_carrier = pwm_ir_set_carrier;  in pwm_ir_probe()
112 	rc = devm_rc_register_device(&pdev->dev, rcdev);  in pwm_ir_probe()
114 		dev_err(&pdev->dev, "failed to register rc device\n");  in pwm_ir_probe()
128 MODULE_DESCRIPTION("PWM IR Transmitter");