^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * LED driver for the DAC124S085 SPI DAC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/leds.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct dac124s085_led {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct led_classdev ldev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct spi_device *spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) char name[sizeof("dac124s085-3")];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct mutex mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct dac124s085 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct dac124s085_led leds[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define REG_WRITE (0 << 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define REG_WRITE_UPDATE (1 << 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define ALL_WRITE_UPDATE (2 << 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define POWER_DOWN_OUTPUT (3 << 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static int dac124s085_set_brightness(struct led_classdev *ldev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) enum led_brightness brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct dac124s085_led *led = container_of(ldev, struct dac124s085_led,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) ldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u16 word;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) mutex_lock(&led->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) word = cpu_to_le16(((led->id) << 14) | REG_WRITE_UPDATE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) (brightness & 0xfff));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ret = spi_write(led->spi, (const u8 *)&word, sizeof(word));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) mutex_unlock(&led->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int dac124s085_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct dac124s085 *dac;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct dac124s085_led *led;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) dac = devm_kzalloc(&spi->dev, sizeof(*dac), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (!dac)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) spi->bits_per_word = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) for (i = 0; i < ARRAY_SIZE(dac->leds); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) led = dac->leds + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) led->id = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) led->spi = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) snprintf(led->name, sizeof(led->name), "dac124s085-%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) mutex_init(&led->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) led->ldev.name = led->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) led->ldev.brightness = LED_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) led->ldev.max_brightness = 0xfff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) led->ldev.brightness_set_blocking = dac124s085_set_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ret = led_classdev_register(&spi->dev, &led->ldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) goto eledcr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) spi_set_drvdata(spi, dac);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) eledcr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) while (i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) led_classdev_unregister(&dac->leds[i].ldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static int dac124s085_remove(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct dac124s085 *dac = spi_get_drvdata(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) for (i = 0; i < ARRAY_SIZE(dac->leds); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) led_classdev_unregister(&dac->leds[i].ldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static struct spi_driver dac124s085_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .probe = dac124s085_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .remove = dac124s085_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) .name = "dac124s085",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) module_spi_driver(dac124s085_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) MODULE_DESCRIPTION("DAC124S085 LED driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) MODULE_ALIAS("spi:dac124s085");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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