Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Guennadi Liakhovetski |
467 |
93.78% |
1 |
12.50% |
| Andrew Lunn |
14 |
2.81% |
1 |
12.50% |
| Bryan Wu |
6 |
1.20% |
1 |
12.50% |
| Anton Vorontsov |
5 |
1.00% |
1 |
12.50% |
| Thomas Gleixner |
2 |
0.40% |
1 |
12.50% |
| Axel Lin |
2 |
0.40% |
1 |
12.50% |
| Uwe Kleine-König |
1 |
0.20% |
1 |
12.50% |
| Stepan Ionichev |
1 |
0.20% |
1 |
12.50% |
| Total |
498 |
|
8 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2008
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
*
* LED driver for the DAC124S085 SPI DAC
*/
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
struct dac124s085_led {
struct led_classdev ldev;
struct spi_device *spi;
int id;
char name[sizeof("dac124s085-3")];
struct mutex mutex;
};
struct dac124s085 {
struct dac124s085_led leds[4];
};
#define REG_WRITE (0 << 12)
#define REG_WRITE_UPDATE (1 << 12)
#define ALL_WRITE_UPDATE (2 << 12)
#define POWER_DOWN_OUTPUT (3 << 12)
static int dac124s085_set_brightness(struct led_classdev *ldev,
enum led_brightness brightness)
{
struct dac124s085_led *led = container_of(ldev, struct dac124s085_led,
ldev);
__le16 word;
int ret;
mutex_lock(&led->mutex);
word = cpu_to_le16(((led->id) << 14) | REG_WRITE_UPDATE |
(brightness & 0xfff));
ret = spi_write(led->spi, (const u8 *)&word, sizeof(word));
mutex_unlock(&led->mutex);
return ret;
}
static int dac124s085_probe(struct spi_device *spi)
{
struct dac124s085 *dac;
struct dac124s085_led *led;
int i, ret;
dac = devm_kzalloc(&spi->dev, sizeof(*dac), GFP_KERNEL);
if (!dac)
return -ENOMEM;
spi->bits_per_word = 16;
for (i = 0; i < ARRAY_SIZE(dac->leds); i++) {
led = dac->leds + i;
led->id = i;
led->spi = spi;
snprintf(led->name, sizeof(led->name), "dac124s085-%d", i);
mutex_init(&led->mutex);
led->ldev.name = led->name;
led->ldev.brightness = LED_OFF;
led->ldev.max_brightness = 0xfff;
led->ldev.brightness_set_blocking = dac124s085_set_brightness;
ret = led_classdev_register(&spi->dev, &led->ldev);
if (ret < 0)
goto eledcr;
}
spi_set_drvdata(spi, dac);
return 0;
eledcr:
while (i--)
led_classdev_unregister(&dac->leds[i].ldev);
return ret;
}
static void dac124s085_remove(struct spi_device *spi)
{
struct dac124s085 *dac = spi_get_drvdata(spi);
int i;
for (i = 0; i < ARRAY_SIZE(dac->leds); i++)
led_classdev_unregister(&dac->leds[i].ldev);
}
static struct spi_driver dac124s085_driver = {
.probe = dac124s085_probe,
.remove = dac124s085_remove,
.driver = {
.name = "dac124s085",
},
};
module_spi_driver(dac124s085_driver);
MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
MODULE_DESCRIPTION("DAC124S085 LED driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:dac124s085");