1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
// SPDX-License-Identifier: GPL-2.0
// TI LM36274 LED chip family driver
// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/leds.h>
#include <linux/leds-ti-lmu-common.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/mfd/ti-lmu.h>
#include <linux/mfd/ti-lmu-register.h>
#include <uapi/linux/uleds.h>
#define LM36274_MAX_STRINGS 4
#define LM36274_BL_EN BIT(4)
/**
* struct lm36274
* @pdev: platform device
* @led_dev: led class device
* @lmu_data: Register and setting values for common code
* @regmap: Devices register map
* @dev: Pointer to the devices device struct
* @led_sources: The LED strings supported in this array
* @num_leds: Number of LED strings are supported in this array
*/
struct lm36274 {
struct platform_device *pdev;
struct led_classdev led_dev;
struct ti_lmu_bank lmu_data;
struct regmap *regmap;
struct device *dev;
u32 led_sources[LM36274_MAX_STRINGS];
int num_leds;
};
static int lm36274_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
struct lm36274 *chip = container_of(led_cdev, struct lm36274, led_dev);
return ti_lmu_common_set_brightness(&chip->lmu_data, brt_val);
}
static int lm36274_init(struct lm36274 *chip)
{
int enable_val = 0;
int i;
for (i = 0; i < chip->num_leds; i++)
enable_val |= (1 << chip->led_sources[i]);
if (!enable_val) {
dev_err(chip->dev, "No LEDs were enabled\n");
return -EINVAL;
}
enable_val |= LM36274_BL_EN;
return regmap_write(chip->regmap, LM36274_REG_BL_EN, enable_val);
}
static int lm36274_parse_dt(struct lm36274 *chip,
struct led_init_data *init_data)
{
struct device *dev = chip->dev;
struct fwnode_handle *child;
int ret;
/* There should only be 1 node */
if (device_get_child_node_count(dev) != 1)
return -EINVAL;
child = device_get_next_child_node(dev, NULL);
init_data->fwnode = child;
init_data->devicename = chip->pdev->name;
/* for backwards compatibility when `label` property is not present */
init_data->default_label = ":";
chip->num_leds = fwnode_property_count_u32(child, "led-sources");
if (chip->num_leds <= 0) {
ret = -ENODEV;
goto err;
}
ret = fwnode_property_read_u32_array(child, "led-sources",
chip->led_sources, chip->num_leds);
if (ret) {
dev_err(dev, "led-sources property missing\n");
goto err;
}
return 0;
err:
fwnode_handle_put(child);
return ret;
}
static int lm36274_probe(struct platform_device *pdev)
{
struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
struct led_init_data init_data = {};
struct lm36274 *chip;
int ret;
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->pdev = pdev;
chip->dev = &pdev->dev;
chip->regmap = lmu->regmap;
platform_set_drvdata(pdev, chip);
ret = lm36274_parse_dt(chip, &init_data);
if (ret) {
dev_err(chip->dev, "Failed to parse DT node\n");
return ret;
}
ret = lm36274_init(chip);
if (ret) {
fwnode_handle_put(init_data.fwnode);
dev_err(chip->dev, "Failed to init the device\n");
return ret;
}
chip->lmu_data.regmap = chip->regmap;
chip->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT;
chip->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB;
chip->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB;
chip->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
chip->led_dev.brightness_set_blocking = lm36274_brightness_set;
ret = devm_led_classdev_register_ext(chip->dev, &chip->led_dev,
&init_data);
if (ret)
dev_err(chip->dev, "Failed to register LED for node %pfw\n",
init_data.fwnode);
fwnode_handle_put(init_data.fwnode);
return ret;
}
static const struct of_device_id of_lm36274_leds_match[] = {
{ .compatible = "ti,lm36274-backlight", },
{},
};
MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);
static struct platform_driver lm36274_driver = {
.probe = lm36274_probe,
.driver = {
.name = "lm36274-leds",
.of_match_table = of_lm36274_leds_match,
},
};
module_platform_driver(lm36274_driver)
MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
|
