Root/target/linux/ixp4xx/patches-2.6.32/295-latch_led_driver.patch

1--- a/drivers/leds/Kconfig
2+++ b/drivers/leds/Kconfig
3@@ -157,6 +157,13 @@ config LEDS_LP3944
4       To compile this driver as a module, choose M here: the
5       module will be called leds-lp3944.
6 
7+config LEDS_LATCH
8+ tristate "LED Support for Memory Latched LEDs"
9+ depends on LEDS_CLASS
10+ help
11+ -- To Do --
12+
13+
14 config LEDS_CLEVO_MAIL
15     tristate "Mail LED on Clevo notebook"
16     depends on LEDS_CLASS && X86 && SERIO_I8042 && DMI
17--- /dev/null
18+++ b/drivers/leds/leds-latch.c
19@@ -0,0 +1,150 @@
20+/*
21+ * LEDs driver for Memory Latched Devices
22+ *
23+ * Copyright (C) 2008 Gateworks Corp.
24+ * Chris Lang <clang@gateworks.com>
25+ *
26+ * This program is free software; you can redistribute it and/or modify
27+ * it under the terms of the GNU General Public License version 2 as
28+ * published by the Free Software Foundation.
29+ *
30+ */
31+#include <linux/kernel.h>
32+#include <linux/init.h>
33+#include <linux/platform_device.h>
34+#include <linux/leds.h>
35+#include <linux/workqueue.h>
36+#include <asm/io.h>
37+#include <linux/spinlock.h>
38+#include <linux/slab.h>
39+
40+static unsigned int mem_keep = 0xFF;
41+static spinlock_t mem_lock;
42+static unsigned char *iobase;
43+
44+struct latch_led_data {
45+ struct led_classdev cdev;
46+ struct work_struct work;
47+ u8 new_level;
48+ u8 bit;
49+ void (*set_led)(u8 bit, enum led_brightness value);
50+};
51+
52+static void latch_set_led(u8 bit, enum led_brightness value)
53+{
54+ if (value == LED_OFF)
55+ mem_keep |= (0x1 << bit);
56+ else
57+ mem_keep &= ~(0x1 << bit);
58+
59+ writeb(mem_keep, iobase);
60+}
61+
62+static void latch_led_set(struct led_classdev *led_cdev,
63+ enum led_brightness value)
64+{
65+ struct latch_led_data *led_dat =
66+ container_of(led_cdev, struct latch_led_data, cdev);
67+
68+ spin_lock(mem_lock);
69+
70+ led_dat->set_led(led_dat->bit, value);
71+
72+ spin_unlock(mem_lock);
73+}
74+
75+static int latch_led_probe(struct platform_device *pdev)
76+{
77+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
78+ struct latch_led *cur_led;
79+ struct latch_led_data *leds_data, *led_dat;
80+ int i, ret = 0;
81+
82+ if (!pdata)
83+ return -EBUSY;
84+
85+ leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
86+ GFP_KERNEL);
87+ if (!leds_data)
88+ return -ENOMEM;
89+
90+ for (i = 0; i < pdata->num_leds; i++) {
91+ cur_led = &pdata->leds[i];
92+ led_dat = &leds_data[i];
93+
94+ led_dat->cdev.name = cur_led->name;
95+ led_dat->cdev.default_trigger = cur_led->default_trigger;
96+ led_dat->cdev.brightness_set = latch_led_set;
97+ led_dat->cdev.brightness = LED_OFF;
98+ led_dat->bit = cur_led->bit;
99+ led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
100+
101+ ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
102+ if (ret < 0) {
103+ goto err;
104+ }
105+ }
106+
107+ if (!pdata->set_led) {
108+ iobase = ioremap_nocache(pdata->mem, 0x1000);
109+ writeb(0xFF, iobase);
110+ }
111+ platform_set_drvdata(pdev, leds_data);
112+
113+ return 0;
114+
115+err:
116+ if (i > 0) {
117+ for (i = i - 1; i >= 0; i--) {
118+ led_classdev_unregister(&leds_data[i].cdev);
119+ }
120+ }
121+
122+ kfree(leds_data);
123+
124+ return ret;
125+}
126+
127+static int __devexit latch_led_remove(struct platform_device *pdev)
128+{
129+ int i;
130+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
131+ struct latch_led_data *leds_data;
132+
133+ leds_data = platform_get_drvdata(pdev);
134+
135+ for (i = 0; i < pdata->num_leds; i++) {
136+ led_classdev_unregister(&leds_data[i].cdev);
137+ cancel_work_sync(&leds_data[i].work);
138+ }
139+
140+ kfree(leds_data);
141+
142+ return 0;
143+}
144+
145+static struct platform_driver latch_led_driver = {
146+ .probe = latch_led_probe,
147+ .remove = __devexit_p(latch_led_remove),
148+ .driver = {
149+ .name = "leds-latch",
150+ .owner = THIS_MODULE,
151+ },
152+};
153+
154+static int __init latch_led_init(void)
155+{
156+ return platform_driver_register(&latch_led_driver);
157+}
158+
159+static void __exit latch_led_exit(void)
160+{
161+ platform_driver_unregister(&latch_led_driver);
162+}
163+
164+module_init(latch_led_init);
165+module_exit(latch_led_exit);
166+
167+MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
168+MODULE_DESCRIPTION("Latch LED driver");
169+MODULE_LICENSE("GPL");
170--- a/drivers/leds/Makefile
171+++ b/drivers/leds/Makefile
172@@ -20,6 +20,7 @@ obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-c
173 obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o
174 obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
175 obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
176+obj-$(CONFIG_LEDS_LATCH) += leds-latch.o
177 obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
178 obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
179 obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
180--- a/include/linux/leds.h
181+++ b/include/linux/leds.h
182@@ -161,5 +161,19 @@ struct gpio_led_platform_data {
183                     unsigned long *delay_off);
184 };
185 
186+/* For the leds-latch driver */
187+struct latch_led {
188+ const char *name;
189+ char *default_trigger;
190+ unsigned bit;
191+};
192+
193+struct latch_led_platform_data {
194+ int num_leds;
195+ u32 mem;
196+ struct latch_led *leds;
197+ void (*set_led)(u8 bit, enum led_brightness value);
198+};
199+
200 
201 #endif /* __LINUX_LEDS_H_INCLUDED */
202

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