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
|
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -125,6 +125,12 @@ config LEDS_GPIO
outputs. To be useful the particular board must have LEDs
and they must be connected to the GPIO lines.
+config LEDS_LATCH
+ tristate "LED Support for Memory Latched LEDs"
+ depends on LEDS_CLASS
+ help
+ -- To Do --
+
config LEDS_CM_X270
tristate "LED Support for the CM-X270 LEDs"
depends on LEDS_CLASS && MACH_ARMCORE
--- /dev/null
+++ b/drivers/leds/leds-latch.c
@@ -0,0 +1,149 @@
+/*
+ * LEDs driver for Memory Latched Devices
+ *
+ * Copyright (C) 2008 Gateworks Corp.
+ * Chris Lang <clang@gateworks.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/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <asm/io.h>
+#include <linux/spinlock.h>
+
+static unsigned int mem_keep = 0xFF;
+static spinlock_t mem_lock;
+static unsigned char *iobase;
+
+struct latch_led_data {
+ struct led_classdev cdev;
+ struct work_struct work;
+ u8 new_level;
+ u8 bit;
+ void (*set_led)(u8 bit, enum led_brightness value);
+};
+
+static void latch_set_led(u8 bit, enum led_brightness value)
+{
+ if (value == LED_OFF)
+ mem_keep |= (0x1 << bit);
+ else
+ mem_keep &= ~(0x1 << bit);
+
+ writeb(mem_keep, iobase);
+}
+
+static void latch_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct latch_led_data *led_dat =
+ container_of(led_cdev, struct latch_led_data, cdev);
+
+ spin_lock(mem_lock);
+
+ led_dat->set_led(led_dat->bit, value);
+
+ spin_unlock(mem_lock);
+}
+
+static int latch_led_probe(struct platform_device *pdev)
+{
+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
+ struct latch_led *cur_led;
+ struct latch_led_data *leds_data, *led_dat;
+ int i, ret = 0;
+
+ if (!pdata)
+ return -EBUSY;
+
+ leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
+ GFP_KERNEL);
+ if (!leds_data)
+ return -ENOMEM;
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ cur_led = &pdata->leds[i];
+ led_dat = &leds_data[i];
+
+ led_dat->cdev.name = cur_led->name;
+ led_dat->cdev.default_trigger = cur_led->default_trigger;
+ led_dat->cdev.brightness_set = latch_led_set;
+ led_dat->cdev.brightness = LED_OFF;
+ led_dat->bit = cur_led->bit;
+ led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
+
+ ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
+ if (ret < 0) {
+ goto err;
+ }
+ }
+
+ if (!pdata->set_led) {
+ iobase = ioremap_nocache(pdata->mem, 0x1000);
+ writeb(0xFF, iobase);
+ }
+ platform_set_drvdata(pdev, leds_data);
+
+ return 0;
+
+err:
+ if (i > 0) {
+ for (i = i - 1; i >= 0; i--) {
+ led_classdev_unregister(&leds_data[i].cdev);
+ }
+ }
+
+ kfree(leds_data);
+
+ return ret;
+}
+
+static int __devexit latch_led_remove(struct platform_device *pdev)
+{
+ int i;
+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
+ struct latch_led_data *leds_data;
+
+ leds_data = platform_get_drvdata(pdev);
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ led_classdev_unregister(&leds_data[i].cdev);
+ cancel_work_sync(&leds_data[i].work);
+ }
+
+ kfree(leds_data);
+
+ return 0;
+}
+
+static struct platform_driver latch_led_driver = {
+ .probe = latch_led_probe,
+ .remove = __devexit_p(latch_led_remove),
+ .driver = {
+ .name = "leds-latch",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init latch_led_init(void)
+{
+ return platform_driver_register(&latch_led_driver);
+}
+
+static void __exit latch_led_exit(void)
+{
+ platform_driver_unregister(&latch_led_driver);
+}
+
+module_init(latch_led_init);
+module_exit(latch_led_exit);
+
+MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
+MODULE_DESCRIPTION("Latch LED driver");
+MODULE_LICENSE("GPL");
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-
obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
+obj-$(CONFIG_LEDS_LATCH) += leds-latch.o
obj-$(CONFIG_LEDS_CM_X270) += leds-cm-x270.o
obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -148,5 +148,19 @@ struct gpio_led_platform_data {
unsigned long *delay_off);
};
+/* For the leds-latch driver */
+struct latch_led {
+ const char *name;
+ char *default_trigger;
+ unsigned bit;
+};
+
+struct latch_led_platform_data {
+ int num_leds;
+ u32 mem;
+ struct latch_led *leds;
+ void (*set_led)(u8 bit, enum led_brightness value);
+};
+
#endif /* __LINUX_LEDS_H_INCLUDED */
|
