Root/target/linux/ixp4xx/patches-2.6.38/295-latch_led_driver.patch

1--- a/drivers/leds/Kconfig
2+++ b/drivers/leds/Kconfig
3@@ -210,6 +210,13 @@ config LEDS_LP5523
4       Driver provides direct control via LED class and interface for
5       programming the engines.
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
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/slab.h>
33+#include <linux/init.h>
34+#include <linux/platform_device.h>
35+#include <linux/leds.h>
36+#include <linux/workqueue.h>
37+#include <asm/io.h>
38+#include <linux/spinlock.h>
39+#include <linux/slab.h>
40+
41+static unsigned int mem_keep = 0xFF;
42+static spinlock_t mem_lock;
43+static unsigned char *iobase;
44+
45+struct latch_led_data {
46+ struct led_classdev cdev;
47+ struct work_struct work;
48+ u8 new_level;
49+ u8 bit;
50+ void (*set_led)(u8 bit, enum led_brightness value);
51+};
52+
53+static void latch_set_led(u8 bit, enum led_brightness value)
54+{
55+ if (value == LED_OFF)
56+ mem_keep |= (0x1 << bit);
57+ else
58+ mem_keep &= ~(0x1 << bit);
59+
60+ writeb(mem_keep, iobase);
61+}
62+
63+static void latch_led_set(struct led_classdev *led_cdev,
64+ enum led_brightness value)
65+{
66+ struct latch_led_data *led_dat =
67+ container_of(led_cdev, struct latch_led_data, cdev);
68+
69+ raw_spin_lock(mem_lock);
70+
71+ led_dat->set_led(led_dat->bit, value);
72+
73+ raw_spin_unlock(mem_lock);
74+}
75+
76+static int latch_led_probe(struct platform_device *pdev)
77+{
78+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
79+ struct latch_led *cur_led;
80+ struct latch_led_data *leds_data, *led_dat;
81+ int i, ret = 0;
82+
83+ if (!pdata)
84+ return -EBUSY;
85+
86+ leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
87+ GFP_KERNEL);
88+ if (!leds_data)
89+ return -ENOMEM;
90+
91+ for (i = 0; i < pdata->num_leds; i++) {
92+ cur_led = &pdata->leds[i];
93+ led_dat = &leds_data[i];
94+
95+ led_dat->cdev.name = cur_led->name;
96+ led_dat->cdev.default_trigger = cur_led->default_trigger;
97+ led_dat->cdev.brightness_set = latch_led_set;
98+ led_dat->cdev.brightness = LED_OFF;
99+ led_dat->bit = cur_led->bit;
100+ led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
101+
102+ ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
103+ if (ret < 0) {
104+ goto err;
105+ }
106+ }
107+
108+ if (!pdata->set_led) {
109+ iobase = ioremap_nocache(pdata->mem, 0x1000);
110+ writeb(0xFF, iobase);
111+ }
112+ platform_set_drvdata(pdev, leds_data);
113+
114+ return 0;
115+
116+err:
117+ if (i > 0) {
118+ for (i = i - 1; i >= 0; i--) {
119+ led_classdev_unregister(&leds_data[i].cdev);
120+ }
121+ }
122+
123+ kfree(leds_data);
124+
125+ return ret;
126+}
127+
128+static int __devexit latch_led_remove(struct platform_device *pdev)
129+{
130+ int i;
131+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
132+ struct latch_led_data *leds_data;
133+
134+ leds_data = platform_get_drvdata(pdev);
135+
136+ for (i = 0; i < pdata->num_leds; i++) {
137+ led_classdev_unregister(&leds_data[i].cdev);
138+ cancel_work_sync(&leds_data[i].work);
139+ }
140+
141+ kfree(leds_data);
142+
143+ return 0;
144+}
145+
146+static struct platform_driver latch_led_driver = {
147+ .probe = latch_led_probe,
148+ .remove = __devexit_p(latch_led_remove),
149+ .driver = {
150+ .name = "leds-latch",
151+ .owner = THIS_MODULE,
152+ },
153+};
154+
155+static int __init latch_led_init(void)
156+{
157+ return platform_driver_register(&latch_led_driver);
158+}
159+
160+static void __exit latch_led_exit(void)
161+{
162+ platform_driver_unregister(&latch_led_driver);
163+}
164+
165+module_init(latch_led_init);
166+module_exit(latch_led_exit);
167+
168+MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
169+MODULE_DESCRIPTION("Latch LED driver");
170--- a/drivers/leds/Makefile
171+++ b/drivers/leds/Makefile
172@@ -22,6 +22,7 @@ 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-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
179 obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
180--- a/include/linux/leds.h
181+++ b/include/linux/leds.h
182@@ -204,5 +204,19 @@ 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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