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112 lines
2.4 KiB
112 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2008 |
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* Guennadi Liakhovetski, DENX Software Engineering, <[email protected]> |
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* |
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* LED driver for the DAC124S085 SPI DAC |
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*/ |
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#include <linux/leds.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/spi/spi.h> |
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struct dac124s085_led { |
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struct led_classdev ldev; |
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struct spi_device *spi; |
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int id; |
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char name[sizeof("dac124s085-3")]; |
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struct mutex mutex; |
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}; |
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struct dac124s085 { |
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struct dac124s085_led leds[4]; |
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}; |
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#define REG_WRITE (0 << 12) |
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#define REG_WRITE_UPDATE (1 << 12) |
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#define ALL_WRITE_UPDATE (2 << 12) |
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#define POWER_DOWN_OUTPUT (3 << 12) |
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static int dac124s085_set_brightness(struct led_classdev *ldev, |
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enum led_brightness brightness) |
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{ |
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struct dac124s085_led *led = container_of(ldev, struct dac124s085_led, |
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ldev); |
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u16 word; |
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int ret; |
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mutex_lock(&led->mutex); |
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word = cpu_to_le16(((led->id) << 14) | REG_WRITE_UPDATE | |
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(brightness & 0xfff)); |
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ret = spi_write(led->spi, (const u8 *)&word, sizeof(word)); |
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mutex_unlock(&led->mutex); |
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return ret; |
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} |
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static int dac124s085_probe(struct spi_device *spi) |
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{ |
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struct dac124s085 *dac; |
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struct dac124s085_led *led; |
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int i, ret; |
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dac = devm_kzalloc(&spi->dev, sizeof(*dac), GFP_KERNEL); |
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if (!dac) |
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return -ENOMEM; |
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spi->bits_per_word = 16; |
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for (i = 0; i < ARRAY_SIZE(dac->leds); i++) { |
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led = dac->leds + i; |
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led->id = i; |
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led->spi = spi; |
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snprintf(led->name, sizeof(led->name), "dac124s085-%d", i); |
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mutex_init(&led->mutex); |
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led->ldev.name = led->name; |
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led->ldev.brightness = LED_OFF; |
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led->ldev.max_brightness = 0xfff; |
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led->ldev.brightness_set_blocking = dac124s085_set_brightness; |
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ret = led_classdev_register(&spi->dev, &led->ldev); |
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if (ret < 0) |
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goto eledcr; |
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} |
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spi_set_drvdata(spi, dac); |
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return 0; |
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eledcr: |
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while (i--) |
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led_classdev_unregister(&dac->leds[i].ldev); |
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return ret; |
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} |
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static int dac124s085_remove(struct spi_device *spi) |
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{ |
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struct dac124s085 *dac = spi_get_drvdata(spi); |
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int i; |
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for (i = 0; i < ARRAY_SIZE(dac->leds); i++) |
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led_classdev_unregister(&dac->leds[i].ldev); |
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return 0; |
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} |
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static struct spi_driver dac124s085_driver = { |
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.probe = dac124s085_probe, |
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.remove = dac124s085_remove, |
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.driver = { |
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.name = "dac124s085", |
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}, |
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}; |
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module_spi_driver(dac124s085_driver); |
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MODULE_AUTHOR("Guennadi Liakhovetski <[email protected]>"); |
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MODULE_DESCRIPTION("DAC124S085 LED driver"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("spi:dac124s085");
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