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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2008
4 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
5 *
6 * LED driver for the DAC124S085 SPI DAC
7 */
8
9#include <linux/leds.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/slab.h>
13#include <linux/spi/spi.h>
14
15struct dac124s085_led {
16 struct led_classdev ldev;
17 struct spi_device *spi;
18 int id;
19 char name[sizeof("dac124s085-3")];
20
21 struct mutex mutex;
22};
23
24struct dac124s085 {
25 struct dac124s085_led leds[4];
26};
27
28#define REG_WRITE (0 << 12)
29#define REG_WRITE_UPDATE (1 << 12)
30#define ALL_WRITE_UPDATE (2 << 12)
31#define POWER_DOWN_OUTPUT (3 << 12)
32
33static int dac124s085_set_brightness(struct led_classdev *ldev,
34 enum led_brightness brightness)
35{
36 struct dac124s085_led *led = container_of(ldev, struct dac124s085_led,
37 ldev);
38 u16 word;
39 int ret;
40
41 mutex_lock(&led->mutex);
42 word = cpu_to_le16(((led->id) << 14) | REG_WRITE_UPDATE |
43 (brightness & 0xfff));
44 ret = spi_write(led->spi, (const u8 *)&word, sizeof(word));
45 mutex_unlock(&led->mutex);
46
47 return ret;
48}
49
50static int dac124s085_probe(struct spi_device *spi)
51{
52 struct dac124s085 *dac;
53 struct dac124s085_led *led;
54 int i, ret;
55
56 dac = devm_kzalloc(&spi->dev, sizeof(*dac), GFP_KERNEL);
57 if (!dac)
58 return -ENOMEM;
59
60 spi->bits_per_word = 16;
61
62 for (i = 0; i < ARRAY_SIZE(dac->leds); i++) {
63 led = dac->leds + i;
64 led->id = i;
65 led->spi = spi;
66 snprintf(led->name, sizeof(led->name), "dac124s085-%d", i);
67 mutex_init(&led->mutex);
68 led->ldev.name = led->name;
69 led->ldev.brightness = LED_OFF;
70 led->ldev.max_brightness = 0xfff;
71 led->ldev.brightness_set_blocking = dac124s085_set_brightness;
72 ret = led_classdev_register(&spi->dev, &led->ldev);
73 if (ret < 0)
74 goto eledcr;
75 }
76
77 spi_set_drvdata(spi, dac);
78
79 return 0;
80
81eledcr:
82 while (i--)
83 led_classdev_unregister(&dac->leds[i].ldev);
84
85 return ret;
86}
87
88static void dac124s085_remove(struct spi_device *spi)
89{
90 struct dac124s085 *dac = spi_get_drvdata(spi);
91 int i;
92
93 for (i = 0; i < ARRAY_SIZE(dac->leds); i++)
94 led_classdev_unregister(&dac->leds[i].ldev);
95}
96
97static struct spi_driver dac124s085_driver = {
98 .probe = dac124s085_probe,
99 .remove = dac124s085_remove,
100 .driver = {
101 .name = "dac124s085",
102 },
103};
104
105module_spi_driver(dac124s085_driver);
106
107MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
108MODULE_DESCRIPTION("DAC124S085 LED driver");
109MODULE_LICENSE("GPL v2");
110MODULE_ALIAS("spi:dac124s085");
1/*
2 * Copyright 2008
3 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
4 *
5 * This file is subject to the terms and conditions of version 2 of
6 * the GNU General Public License. See the file COPYING in the main
7 * directory of this archive for more details.
8 *
9 * LED driver for the DAC124S085 SPI DAC
10 */
11
12#include <linux/leds.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/slab.h>
16#include <linux/spi/spi.h>
17
18struct dac124s085_led {
19 struct led_classdev ldev;
20 struct spi_device *spi;
21 int id;
22 char name[sizeof("dac124s085-3")];
23
24 struct mutex mutex;
25};
26
27struct dac124s085 {
28 struct dac124s085_led leds[4];
29};
30
31#define REG_WRITE (0 << 12)
32#define REG_WRITE_UPDATE (1 << 12)
33#define ALL_WRITE_UPDATE (2 << 12)
34#define POWER_DOWN_OUTPUT (3 << 12)
35
36static int dac124s085_set_brightness(struct led_classdev *ldev,
37 enum led_brightness brightness)
38{
39 struct dac124s085_led *led = container_of(ldev, struct dac124s085_led,
40 ldev);
41 u16 word;
42 int ret;
43
44 mutex_lock(&led->mutex);
45 word = cpu_to_le16(((led->id) << 14) | REG_WRITE_UPDATE |
46 (brightness & 0xfff));
47 ret = spi_write(led->spi, (const u8 *)&word, sizeof(word));
48 mutex_unlock(&led->mutex);
49
50 return ret;
51}
52
53static int dac124s085_probe(struct spi_device *spi)
54{
55 struct dac124s085 *dac;
56 struct dac124s085_led *led;
57 int i, ret;
58
59 dac = devm_kzalloc(&spi->dev, sizeof(*dac), GFP_KERNEL);
60 if (!dac)
61 return -ENOMEM;
62
63 spi->bits_per_word = 16;
64
65 for (i = 0; i < ARRAY_SIZE(dac->leds); i++) {
66 led = dac->leds + i;
67 led->id = i;
68 led->spi = spi;
69 snprintf(led->name, sizeof(led->name), "dac124s085-%d", i);
70 mutex_init(&led->mutex);
71 led->ldev.name = led->name;
72 led->ldev.brightness = LED_OFF;
73 led->ldev.max_brightness = 0xfff;
74 led->ldev.brightness_set_blocking = dac124s085_set_brightness;
75 ret = led_classdev_register(&spi->dev, &led->ldev);
76 if (ret < 0)
77 goto eledcr;
78 }
79
80 spi_set_drvdata(spi, dac);
81
82 return 0;
83
84eledcr:
85 while (i--)
86 led_classdev_unregister(&dac->leds[i].ldev);
87
88 return ret;
89}
90
91static int dac124s085_remove(struct spi_device *spi)
92{
93 struct dac124s085 *dac = spi_get_drvdata(spi);
94 int i;
95
96 for (i = 0; i < ARRAY_SIZE(dac->leds); i++)
97 led_classdev_unregister(&dac->leds[i].ldev);
98
99 return 0;
100}
101
102static struct spi_driver dac124s085_driver = {
103 .probe = dac124s085_probe,
104 .remove = dac124s085_remove,
105 .driver = {
106 .name = "dac124s085",
107 },
108};
109
110module_spi_driver(dac124s085_driver);
111
112MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
113MODULE_DESCRIPTION("DAC124S085 LED driver");
114MODULE_LICENSE("GPL v2");
115MODULE_ALIAS("spi:dac124s085");