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 
18 MODULE_AUTHOR("Márton Németh <nm127@freemail.hu>");
19 MODULE_DESCRIPTION("Clevo mail LED driver");
20 MODULE_LICENSE("GPL");
21 
22 static bool nodetect;
23 module_param_named(nodetect, nodetect, bool, 0);
24 MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");
25 
26 static struct platform_device *pdev;
27 
28 static 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  */
43 static const struct dmi_system_id clevo_mail_led_dmi_table[] __initconst = {
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 };
92 MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);
93 
94 static 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 
110 static 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 
149 static 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 
156 static int __init clevo_mail_led_probe(struct platform_device *pdev)
157 {
158 	return led_classdev_register(&pdev->dev, &clevo_mail_led);
159 }
160 
161 static int clevo_mail_led_remove(struct platform_device *pdev)
162 {
163 	led_classdev_unregister(&clevo_mail_led);
164 	return 0;
165 }
166 
167 static struct platform_driver clevo_mail_led_driver = {
168 	.remove		= clevo_mail_led_remove,
169 	.driver		= {
170 		.name		= KBUILD_MODNAME,
171 	},
172 };
173 
174 static 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 
207 static 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 
215 module_init(clevo_mail_led_init);
216 module_exit(clevo_mail_led_exit);
217