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
clevo_mail_led_dmi_callback(const struct dmi_system_id * id)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 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 };
92 MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);
93
clevo_mail_led_set(struct led_classdev * led_cdev,enum led_brightness value)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
clevo_mail_led_blink(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)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
clevo_mail_led_probe(struct platform_device * pdev)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
clevo_mail_led_remove(struct platform_device * pdev)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
clevo_mail_led_init(void)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
clevo_mail_led_exit(void)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