^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) // SPI driven IR LED device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) // Copyright (c) 2016 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) // Copyright (c) Andi Shyti <andi@etezian.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of_gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <media/rc-core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define IR_SPI_DRIVER_NAME "ir-spi"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define IR_SPI_DEFAULT_FREQUENCY 38000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define IR_SPI_MAX_BUFSIZE 4096
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct ir_spi_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) u32 freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) bool negated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) u16 tx_buf[IR_SPI_MAX_BUFSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) u16 pulse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) u16 space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct rc_dev *rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct spi_device *spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct regulator *regulator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static int ir_spi_tx(struct rc_dev *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned int *buffer, unsigned int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) unsigned int len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct ir_spi_data *idata = dev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct spi_transfer xfer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* convert the pulse/space signal to raw binary signal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned int periods;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) u16 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) periods = DIV_ROUND_CLOSEST(buffer[i] * idata->freq, 1000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (len + periods >= IR_SPI_MAX_BUFSIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * the first value in buffer is a pulse, so that 0, 2, 4, ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * contain a pulse duration. On the contrary, 1, 3, 5, ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * contain a space duration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) val = (i % 2) ? idata->space : idata->pulse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) for (j = 0; j < periods; j++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) idata->tx_buf[len++] = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) memset(&xfer, 0, sizeof(xfer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) xfer.speed_hz = idata->freq * 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) xfer.len = len * sizeof(*idata->tx_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) xfer.tx_buf = idata->tx_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ret = regulator_enable(idata->regulator);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ret = spi_sync_transfer(idata->spi, &xfer, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) dev_err(&idata->spi->dev, "unable to deliver the signal\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) regulator_disable(idata->regulator);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return ret ? ret : count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int ir_spi_set_tx_carrier(struct rc_dev *dev, u32 carrier)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct ir_spi_data *idata = dev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (!carrier)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) idata->freq = carrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static int ir_spi_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct ir_spi_data *idata = dev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int bits = (duty_cycle * 15) / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) idata->pulse = GENMASK(bits, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (idata->negated) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) idata->pulse = ~idata->pulse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) idata->space = 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) idata->space = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int ir_spi_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) u8 dc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct ir_spi_data *idata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) idata = devm_kzalloc(&spi->dev, sizeof(*idata), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (!idata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) idata->regulator = devm_regulator_get(&spi->dev, "irda_regulator");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (IS_ERR(idata->regulator))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return PTR_ERR(idata->regulator);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) idata->rc = devm_rc_allocate_device(&spi->dev, RC_DRIVER_IR_RAW_TX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (!idata->rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) idata->rc->tx_ir = ir_spi_tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) idata->rc->s_tx_carrier = ir_spi_set_tx_carrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) idata->rc->s_tx_duty_cycle = ir_spi_set_duty_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) idata->rc->device_name = "IR SPI";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) idata->rc->driver_name = IR_SPI_DRIVER_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) idata->rc->priv = idata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) idata->spi = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) idata->negated = of_property_read_bool(spi->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) "led-active-low");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ret = of_property_read_u8(spi->dev.of_node, "duty-cycle", &dc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) dc = 50;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /* ir_spi_set_duty_cycle cannot fail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * it returns int to be compatible with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * rc->s_tx_duty_cycle function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ir_spi_set_duty_cycle(idata->rc, dc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) idata->freq = IR_SPI_DEFAULT_FREQUENCY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return devm_rc_register_device(&spi->dev, idata->rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static int ir_spi_remove(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static const struct of_device_id ir_spi_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) { .compatible = "ir-spi-led" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) MODULE_DEVICE_TABLE(of, ir_spi_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static struct spi_driver ir_spi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) .probe = ir_spi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) .remove = ir_spi_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .name = IR_SPI_DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) .of_match_table = ir_spi_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) module_spi_driver(ir_spi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) MODULE_AUTHOR("Andi Shyti <andi@etezian.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) MODULE_DESCRIPTION("SPI IR LED");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags