1 // SPDX-License-Identifier: GPL-2.0
2 // SPI driven IR LED device driver
15 #include <linux/spi/spi.h>
19 #include <media/rc-core.h>
21 #define IR_SPI_DRIVER_NAME		"ir-spi"
35 	struct spi_device *spi;  member
44 	struct ir_spi_data *idata = dev->priv;  in ir_spi_tx()
53 		periods = DIV_ROUND_CLOSEST(buffer[i] * idata->freq, 1000000);  in ir_spi_tx()
56 			return -EINVAL;  in ir_spi_tx()
63 		val = (i % 2) ? idata->space : idata->pulse;  in ir_spi_tx()
65 			idata->tx_buf[len++] = val;  in ir_spi_tx()
70 	xfer.speed_hz = idata->freq * 16;  in ir_spi_tx()
71 	xfer.len = len * sizeof(*idata->tx_buf);  in ir_spi_tx()
72 	xfer.tx_buf = idata->tx_buf;  in ir_spi_tx()
74 	ret = regulator_enable(idata->regulator);  in ir_spi_tx()
78 	ret = spi_sync_transfer(idata->spi, &xfer, 1);  in ir_spi_tx()
80 		dev_err(&idata->spi->dev, "unable to deliver the signal\n");  in ir_spi_tx()
82 	regulator_disable(idata->regulator);  in ir_spi_tx()
89 	struct ir_spi_data *idata = dev->priv;  in ir_spi_set_tx_carrier()
92 		return -EINVAL;  in ir_spi_set_tx_carrier()
94 	idata->freq = carrier;  in ir_spi_set_tx_carrier()
101 	struct ir_spi_data *idata = dev->priv;  in ir_spi_set_duty_cycle()
104 	idata->pulse = GENMASK(bits, 0);  in ir_spi_set_duty_cycle()
106 	if (idata->negated) {  in ir_spi_set_duty_cycle()
107 		idata->pulse = ~idata->pulse;  in ir_spi_set_duty_cycle()
108 		idata->space = 0xffff;  in ir_spi_set_duty_cycle()
110 		idata->space = 0;  in ir_spi_set_duty_cycle()
116 static int ir_spi_probe(struct spi_device *spi)  in ir_spi_probe()  argument
118 	struct device *dev = &spi->dev;  in ir_spi_probe()
125 		return -ENOMEM;  in ir_spi_probe()
127 	idata->regulator = devm_regulator_get(dev, "irda_regulator");  in ir_spi_probe()
128 	if (IS_ERR(idata->regulator))  in ir_spi_probe()
129 		return PTR_ERR(idata->regulator);  in ir_spi_probe()
131 	idata->rc = devm_rc_allocate_device(&spi->dev, RC_DRIVER_IR_RAW_TX);  in ir_spi_probe()
132 	if (!idata->rc)  in ir_spi_probe()
133 		return -ENOMEM;  in ir_spi_probe()
135 	idata->rc->tx_ir           = ir_spi_tx;  in ir_spi_probe()
136 	idata->rc->s_tx_carrier    = ir_spi_set_tx_carrier;  in ir_spi_probe()
137 	idata->rc->s_tx_duty_cycle = ir_spi_set_duty_cycle;  in ir_spi_probe()
138 	idata->rc->device_name	   = "IR SPI";  in ir_spi_probe()
139 	idata->rc->driver_name     = IR_SPI_DRIVER_NAME;  in ir_spi_probe()
140 	idata->rc->priv            = idata;  in ir_spi_probe()
141 	idata->spi                 = spi;  in ir_spi_probe()
143 	idata->negated = device_property_read_bool(dev, "led-active-low");  in ir_spi_probe()
144 	ret = device_property_read_u8(dev, "duty-cycle", &dc);  in ir_spi_probe()
150 	 * to be compatible with the rc->s_tx_duty_cycle function.  in ir_spi_probe()
152 	ir_spi_set_duty_cycle(idata->rc, dc);  in ir_spi_probe()
154 	idata->freq = IR_SPI_DEFAULT_FREQUENCY;  in ir_spi_probe()
156 	return devm_rc_register_device(dev, idata->rc);  in ir_spi_probe()
160 	{ .compatible = "ir-spi-led" },
166 	{ "ir-spi-led" },
169 MODULE_DEVICE_TABLE(spi, ir_spi_ids);
182 MODULE_DESCRIPTION("SPI IR LED");