1#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2
3#include <linux/module.h>
4
5#include <linux/platform_device.h>
6#include <linux/err.h>
7#include <linux/leds.h>
8
9#include <linux/io.h>
10#include <linux/dmi.h>
11
12#include <linux/i8042.h>
13
14#define CLEVO_MAIL_LED_OFF		0x0084
15#define CLEVO_MAIL_LED_BLINK_1HZ	0x008A
16#define CLEVO_MAIL_LED_BLINK_0_5HZ	0x0083
17
18MODULE_AUTHOR("Márton Németh <nm127@freemail.hu>");
19MODULE_DESCRIPTION("Clevo mail LED driver");
20MODULE_LICENSE("GPL");
21
22static bool nodetect;
23module_param_named(nodetect, nodetect, bool, 0);
24MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");
25
26static struct platform_device *pdev;
27
28static int __init clevo_mail_led_dmi_callback(const struct dmi_system_id *id)
29{
30	pr_info("'%s' found\n", id->ident);
31	return 1;
32}
33
34/*
35 * struct clevo_mail_led_dmi_table - List of known good models
36 *
37 * Contains the known good models this driver is compatible with.
38 * When adding a new model try to be as strict as possible. This
39 * makes it possible to keep the false positives (the model is
40 * detected as working, but in reality it is not) as low as
41 * possible.
42 */
43static struct dmi_system_id clevo_mail_led_dmi_table[] __initdata = {
44	{
45		.callback = clevo_mail_led_dmi_callback,
46		.ident = "Clevo D410J",
47		.matches = {
48			DMI_MATCH(DMI_SYS_VENDOR, "VIA"),
49			DMI_MATCH(DMI_PRODUCT_NAME, "K8N800"),
50			DMI_MATCH(DMI_PRODUCT_VERSION, "VT8204B")
51		}
52	},
53	{
54		.callback = clevo_mail_led_dmi_callback,
55		.ident = "Clevo M5x0N",
56		.matches = {
57			DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
58			DMI_MATCH(DMI_PRODUCT_NAME, "M5x0N")
59		}
60	},
61	{
62		.callback = clevo_mail_led_dmi_callback,
63		.ident = "Clevo M5x0V",
64		.matches = {
65			DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
66			DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
67			DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
68		}
69	},
70	{
71		.callback = clevo_mail_led_dmi_callback,
72		.ident = "Clevo D400P",
73		.matches = {
74			DMI_MATCH(DMI_BOARD_VENDOR, "Clevo"),
75			DMI_MATCH(DMI_BOARD_NAME, "D400P"),
76			DMI_MATCH(DMI_BOARD_VERSION, "Rev.A"),
77			DMI_MATCH(DMI_PRODUCT_VERSION, "0106")
78		}
79	},
80	{
81		.callback = clevo_mail_led_dmi_callback,
82		.ident = "Clevo D410V",
83		.matches = {
84			DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
85			DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
86			DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
87			DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
88		}
89	},
90	{ }
91};
92MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);
93
94static void clevo_mail_led_set(struct led_classdev *led_cdev,
95				enum led_brightness value)
96{
97	i8042_lock_chip();
98
99	if (value == LED_OFF)
100		i8042_command(NULL, CLEVO_MAIL_LED_OFF);
101	else if (value <= LED_HALF)
102		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
103	else
104		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
105
106	i8042_unlock_chip();
107
108}
109
110static int clevo_mail_led_blink(struct led_classdev *led_cdev,
111				unsigned long *delay_on,
112				unsigned long *delay_off)
113{
114	int status = -EINVAL;
115
116	i8042_lock_chip();
117
118	if (*delay_on == 0 /* ms */ && *delay_off == 0 /* ms */) {
119		/* Special case: the leds subsystem requested us to
120		 * chose one user friendly blinking of the LED, and
121		 * start it. Let's blink the led slowly (0.5Hz).
122		 */
123		*delay_on = 1000; /* ms */
124		*delay_off = 1000; /* ms */
125		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
126		status = 0;
127
128	} else if (*delay_on == 500 /* ms */ && *delay_off == 500 /* ms */) {
129		/* blink the led with 1Hz */
130		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
131		status = 0;
132
133	} else if (*delay_on == 1000 /* ms */ && *delay_off == 1000 /* ms */) {
134		/* blink the led with 0.5Hz */
135		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
136		status = 0;
137
138	} else {
139		pr_debug("clevo_mail_led_blink(..., %lu, %lu),"
140		       " returning -EINVAL (unsupported)\n",
141		       *delay_on, *delay_off);
142	}
143
144	i8042_unlock_chip();
145
146	return status;
147}
148
149static struct led_classdev clevo_mail_led = {
150	.name			= "clevo::mail",
151	.brightness_set		= clevo_mail_led_set,
152	.blink_set		= clevo_mail_led_blink,
153	.flags			= LED_CORE_SUSPENDRESUME,
154};
155
156static int __init clevo_mail_led_probe(struct platform_device *pdev)
157{
158	return led_classdev_register(&pdev->dev, &clevo_mail_led);
159}
160
161static int clevo_mail_led_remove(struct platform_device *pdev)
162{
163	led_classdev_unregister(&clevo_mail_led);
164	return 0;
165}
166
167static struct platform_driver clevo_mail_led_driver = {
168	.remove		= clevo_mail_led_remove,
169	.driver		= {
170		.name		= KBUILD_MODNAME,
171	},
172};
173
174static int __init clevo_mail_led_init(void)
175{
176	int error = 0;
177	int count = 0;
178
179	/* Check with the help of DMI if we are running on supported hardware */
180	if (!nodetect) {
181		count = dmi_check_system(clevo_mail_led_dmi_table);
182	} else {
183		count = 1;
184		pr_err("Skipping DMI detection. "
185		       "If the driver works on your hardware please "
186		       "report model and the output of dmidecode in tracker "
187		       "at http://sourceforge.net/projects/clevo-mailled/\n");
188	}
189
190	if (!count)
191		return -ENODEV;
192
193	pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
194	if (!IS_ERR(pdev)) {
195		error = platform_driver_probe(&clevo_mail_led_driver,
196					      clevo_mail_led_probe);
197		if (error) {
198			pr_err("Can't probe platform driver\n");
199			platform_device_unregister(pdev);
200		}
201	} else
202		error = PTR_ERR(pdev);
203
204	return error;
205}
206
207static void __exit clevo_mail_led_exit(void)
208{
209	platform_device_unregister(pdev);
210	platform_driver_unregister(&clevo_mail_led_driver);
211
212	clevo_mail_led_set(NULL, LED_OFF);
213}
214
215module_init(clevo_mail_led_init);
216module_exit(clevo_mail_led_exit);
217