1 // SPDX-License-Identifier: GPL-2.0
2 // SPI driven IR LED device driver
13 #include <linux/spi/spi.h>
14 #include <media/rc-core.h>
16 #define IR_SPI_DRIVER_NAME		"ir-spi"
30 	struct spi_device *spi;  member
40 	struct ir_spi_data *idata = dev->priv;  in ir_spi_tx()
49 		periods = DIV_ROUND_CLOSEST(buffer[i] * idata->freq, 1000000);  in ir_spi_tx()
52 			return -EINVAL;  in ir_spi_tx()
59 		val = (i % 2) ? idata->space : idata->pulse;  in ir_spi_tx()
61 			idata->tx_buf[len++] = val;  in ir_spi_tx()
66 	xfer.speed_hz = idata->freq * 16;  in ir_spi_tx()
67 	xfer.len = len * sizeof(*idata->tx_buf);  in ir_spi_tx()
68 	xfer.tx_buf = idata->tx_buf;  in ir_spi_tx()
70 	ret = regulator_enable(idata->regulator);  in ir_spi_tx()
74 	ret = spi_sync_transfer(idata->spi, &xfer, 1);  in ir_spi_tx()
76 		dev_err(&idata->spi->dev, "unable to deliver the signal\n");  in ir_spi_tx()
78 	regulator_disable(idata->regulator);  in ir_spi_tx()
85 	struct ir_spi_data *idata = dev->priv;  in ir_spi_set_tx_carrier()
88 		return -EINVAL;  in ir_spi_set_tx_carrier()
90 	idata->freq = carrier;  in ir_spi_set_tx_carrier()
97 	struct ir_spi_data *idata = dev->priv;  in ir_spi_set_duty_cycle()
100 	idata->pulse = GENMASK(bits, 0);  in ir_spi_set_duty_cycle()
102 	if (idata->negated) {  in ir_spi_set_duty_cycle()
103 		idata->pulse = ~idata->pulse;  in ir_spi_set_duty_cycle()
104 		idata->space = 0xffff;  in ir_spi_set_duty_cycle()
106 		idata->space = 0;  in ir_spi_set_duty_cycle()
112 static int ir_spi_probe(struct spi_device *spi)  in ir_spi_probe()  argument
118 	idata = devm_kzalloc(&spi->dev, sizeof(*idata), GFP_KERNEL);  in ir_spi_probe()
120 		return -ENOMEM;  in ir_spi_probe()
122 	idata->regulator = devm_regulator_get(&spi->dev, "irda_regulator");  in ir_spi_probe()
123 	if (IS_ERR(idata->regulator))  in ir_spi_probe()
124 		return PTR_ERR(idata->regulator);  in ir_spi_probe()
126 	idata->rc = devm_rc_allocate_device(&spi->dev, RC_DRIVER_IR_RAW_TX);  in ir_spi_probe()
127 	if (!idata->rc)  in ir_spi_probe()
128 		return -ENOMEM;  in ir_spi_probe()
130 	idata->rc->tx_ir           = ir_spi_tx;  in ir_spi_probe()
131 	idata->rc->s_tx_carrier    = ir_spi_set_tx_carrier;  in ir_spi_probe()
132 	idata->rc->s_tx_duty_cycle = ir_spi_set_duty_cycle;  in ir_spi_probe()
133 	idata->rc->device_name	   = "IR SPI";  in ir_spi_probe()
134 	idata->rc->driver_name     = IR_SPI_DRIVER_NAME;  in ir_spi_probe()
135 	idata->rc->priv            = idata;  in ir_spi_probe()
136 	idata->spi                 = spi;  in ir_spi_probe()
138 	idata->negated = of_property_read_bool(spi->dev.of_node,  in ir_spi_probe()
139 							"led-active-low");  in ir_spi_probe()
140 	ret = of_property_read_u8(spi->dev.of_node, "duty-cycle", &dc);  in ir_spi_probe()
146 	 * rc->s_tx_duty_cycle function  in ir_spi_probe()
148 	ir_spi_set_duty_cycle(idata->rc, dc);  in ir_spi_probe()
150 	idata->freq = IR_SPI_DEFAULT_FREQUENCY;  in ir_spi_probe()
152 	return devm_rc_register_device(&spi->dev, idata->rc);  in ir_spi_probe()
156 	{ .compatible = "ir-spi-led" },
162 	{ "ir-spi-led" },
165 MODULE_DEVICE_TABLE(spi, ir_spi_ids);
179 MODULE_DESCRIPTION("SPI IR LED");