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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/*
* LED driver for Marvell 88PM860x
*
* Copyright (C) 2009 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>
#define LED_PWM_MASK (0x1F)
#define LED_CURRENT_MASK (0x07 << 5)
#define LED_BLINK_MASK (0x7F)
#define LED_ON_CONTINUOUS (0x0F << 3)
#define LED1_BLINK_EN (1 << 1)
#define LED2_BLINK_EN (1 << 2)
struct pm860x_led {
struct led_classdev cdev;
struct i2c_client *i2c;
struct work_struct work;
struct pm860x_chip *chip;
struct mutex lock;
char name[MFD_NAME_SIZE];
int port;
int iset;
unsigned char brightness;
unsigned char current_brightness;
int reg_control;
int reg_blink;
int blink_mask;
};
static int led_power_set(struct pm860x_chip *chip, int port, int on)
{
int ret = -EINVAL;
switch (port) {
case 0:
case 1:
case 2:
ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
pm8606_osc_disable(chip, RGB1_ENABLE);
break;
case 3:
case 4:
case 5:
ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
pm8606_osc_disable(chip, RGB2_ENABLE);
break;
}
return ret;
}
static void pm860x_led_work(struct work_struct *work)
{
struct pm860x_led *led;
struct pm860x_chip *chip;
unsigned char buf[3];
int ret;
led = container_of(work, struct pm860x_led, work);
chip = led->chip;
mutex_lock(&led->lock);
if ((led->current_brightness == 0) && led->brightness) {
led_power_set(chip, led->port, 1);
if (led->iset) {
pm860x_set_bits(led->i2c, led->reg_control,
LED_CURRENT_MASK, led->iset);
}
pm860x_set_bits(led->i2c, led->reg_blink,
LED_BLINK_MASK, LED_ON_CONTINUOUS);
pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
led->blink_mask);
}
pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
led->brightness);
if (led->brightness == 0) {
pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
ret = buf[0] & LED_PWM_MASK;
ret |= buf[1] & LED_PWM_MASK;
ret |= buf[2] & LED_PWM_MASK;
if (ret == 0) {
/* unset current since no led is lighting */
pm860x_set_bits(led->i2c, led->reg_control,
LED_CURRENT_MASK, 0);
pm860x_set_bits(led->i2c, PM8606_WLED3B,
led->blink_mask, 0);
led_power_set(chip, led->port, 0);
}
}
led->current_brightness = led->brightness;
dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
led->reg_control, led->brightness);
mutex_unlock(&led->lock);
}
static void pm860x_led_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
data->brightness = value >> 3;
schedule_work(&data->work);
}
#ifdef CONFIG_OF
static int pm860x_led_dt_init(struct platform_device *pdev,
struct pm860x_led *data)
{
struct device_node *nproot, *np;
int iset = 0;
if (!pdev->dev.parent->of_node)
return -ENODEV;
nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
if (!nproot) {
dev_err(&pdev->dev, "failed to find leds node\n");
return -ENODEV;
}
for_each_child_of_node(nproot, np) {
if (!of_node_cmp(np->name, data->name)) {
of_property_read_u32(np, "marvell,88pm860x-iset",
&iset);
data->iset = PM8606_LED_CURRENT(iset);
of_node_put(np);
break;
}
}
of_node_put(nproot);
return 0;
}
#else
#define pm860x_led_dt_init(x, y) (-1)
#endif
static int pm860x_led_probe(struct platform_device *pdev)
{
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
struct pm860x_led *data;
struct resource *res;
int ret = 0;
data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
if (!res) {
dev_err(&pdev->dev, "No REG resource for control\n");
return -ENXIO;
}
data->reg_control = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
if (!res) {
dev_err(&pdev->dev, "No REG resource for blink\n");
return -ENXIO;
}
data->reg_blink = res->start;
memset(data->name, 0, MFD_NAME_SIZE);
switch (pdev->id) {
case 0:
data->blink_mask = LED1_BLINK_EN;
sprintf(data->name, "led0-red");
break;
case 1:
data->blink_mask = LED1_BLINK_EN;
sprintf(data->name, "led0-green");
break;
case 2:
data->blink_mask = LED1_BLINK_EN;
sprintf(data->name, "led0-blue");
break;
case 3:
data->blink_mask = LED2_BLINK_EN;
sprintf(data->name, "led1-red");
break;
case 4:
data->blink_mask = LED2_BLINK_EN;
sprintf(data->name, "led1-green");
break;
case 5:
data->blink_mask = LED2_BLINK_EN;
sprintf(data->name, "led1-blue");
break;
}
platform_set_drvdata(pdev, data);
data->chip = chip;
data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
data->port = pdev->id;
if (pm860x_led_dt_init(pdev, data))
if (pdata)
data->iset = pdata->iset;
data->current_brightness = 0;
data->cdev.name = data->name;
data->cdev.brightness_set = pm860x_led_set;
mutex_init(&data->lock);
INIT_WORK(&data->work, pm860x_led_work);
ret = led_classdev_register(chip->dev, &data->cdev);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
return ret;
}
pm860x_led_set(&data->cdev, 0);
return 0;
}
static int pm860x_led_remove(struct platform_device *pdev)
{
struct pm860x_led *data = platform_get_drvdata(pdev);
led_classdev_unregister(&data->cdev);
return 0;
}
static struct platform_driver pm860x_led_driver = {
.driver = {
.name = "88pm860x-led",
},
.probe = pm860x_led_probe,
.remove = pm860x_led_remove,
};
module_platform_driver(pm860x_led_driver);
MODULE_DESCRIPTION("LED driver for Marvell PM860x");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-led");
|
