1 // SPDX-License-Identifier: GPL-2.0-only
2 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4 #include <linux/module.h>
5
6 #include <linux/platform_device.h>
7 #include <linux/err.h>
8 #include <linux/leds.h>
9
10 #include <linux/io.h>
11 #include <linux/dmi.h>
12
13 #include <linux/i8042.h>
14
15 #define CLEVO_MAIL_LED_OFF 0x0084
16 #define CLEVO_MAIL_LED_BLINK_1HZ 0x008A
17 #define CLEVO_MAIL_LED_BLINK_0_5HZ 0x0083
18
19 MODULE_AUTHOR("Márton Németh <nm127@freemail.hu>");
20 MODULE_DESCRIPTION("Clevo mail LED driver");
21 MODULE_LICENSE("GPL");
22
23 static bool nodetect;
24 module_param_named(nodetect, nodetect, bool, 0);
25 MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");
26
27 static struct platform_device *pdev;
28
clevo_mail_led_dmi_callback(const struct dmi_system_id * id)29 static int __init clevo_mail_led_dmi_callback(const struct dmi_system_id *id)
30 {
31 pr_info("'%s' found\n", id->ident);
32 return 1;
33 }
34
35 /*
36 * struct clevo_mail_led_dmi_table - List of known good models
37 *
38 * Contains the known good models this driver is compatible with.
39 * When adding a new model try to be as strict as possible. This
40 * makes it possible to keep the false positives (the model is
41 * detected as working, but in reality it is not) as low as
42 * possible.
43 */
44 static const struct dmi_system_id clevo_mail_led_dmi_table[] __initconst = {
45 {
46 .callback = clevo_mail_led_dmi_callback,
47 .ident = "Clevo D410J",
48 .matches = {
49 DMI_MATCH(DMI_SYS_VENDOR, "VIA"),
50 DMI_MATCH(DMI_PRODUCT_NAME, "K8N800"),
51 DMI_MATCH(DMI_PRODUCT_VERSION, "VT8204B")
52 }
53 },
54 {
55 .callback = clevo_mail_led_dmi_callback,
56 .ident = "Clevo M5x0N",
57 .matches = {
58 DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
59 DMI_MATCH(DMI_PRODUCT_NAME, "M5x0N")
60 }
61 },
62 {
63 .callback = clevo_mail_led_dmi_callback,
64 .ident = "Clevo M5x0V",
65 .matches = {
66 DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
67 DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
68 DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
69 }
70 },
71 {
72 .callback = clevo_mail_led_dmi_callback,
73 .ident = "Clevo D400P",
74 .matches = {
75 DMI_MATCH(DMI_BOARD_VENDOR, "Clevo"),
76 DMI_MATCH(DMI_BOARD_NAME, "D400P"),
77 DMI_MATCH(DMI_BOARD_VERSION, "Rev.A"),
78 DMI_MATCH(DMI_PRODUCT_VERSION, "0106")
79 }
80 },
81 {
82 .callback = clevo_mail_led_dmi_callback,
83 .ident = "Clevo D410V",
84 .matches = {
85 DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
86 DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
87 DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
88 DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
89 }
90 },
91 { }
92 };
93 MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);
94
clevo_mail_led_set(struct led_classdev * led_cdev,enum led_brightness value)95 static void clevo_mail_led_set(struct led_classdev *led_cdev,
96 enum led_brightness value)
97 {
98 i8042_lock_chip();
99
100 if (value == LED_OFF)
101 i8042_command(NULL, CLEVO_MAIL_LED_OFF);
102 else if (value <= LED_HALF)
103 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
104 else
105 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
106
107 i8042_unlock_chip();
108
109 }
110
clevo_mail_led_blink(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)111 static int clevo_mail_led_blink(struct led_classdev *led_cdev,
112 unsigned long *delay_on,
113 unsigned long *delay_off)
114 {
115 int status = -EINVAL;
116
117 i8042_lock_chip();
118
119 if (*delay_on == 0 /* ms */ && *delay_off == 0 /* ms */) {
120 /* Special case: the leds subsystem requested us to
121 * chose one user friendly blinking of the LED, and
122 * start it. Let's blink the led slowly (0.5Hz).
123 */
124 *delay_on = 1000; /* ms */
125 *delay_off = 1000; /* ms */
126 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
127 status = 0;
128
129 } else if (*delay_on == 500 /* ms */ && *delay_off == 500 /* ms */) {
130 /* blink the led with 1Hz */
131 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
132 status = 0;
133
134 } else if (*delay_on == 1000 /* ms */ && *delay_off == 1000 /* ms */) {
135 /* blink the led with 0.5Hz */
136 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
137 status = 0;
138
139 } else {
140 pr_debug("clevo_mail_led_blink(..., %lu, %lu),"
141 " returning -EINVAL (unsupported)\n",
142 *delay_on, *delay_off);
143 }
144
145 i8042_unlock_chip();
146
147 return status;
148 }
149
150 static struct led_classdev clevo_mail_led = {
151 .name = "clevo::mail",
152 .brightness_set = clevo_mail_led_set,
153 .blink_set = clevo_mail_led_blink,
154 .flags = LED_CORE_SUSPENDRESUME,
155 };
156
clevo_mail_led_probe(struct platform_device * pdev)157 static int __init clevo_mail_led_probe(struct platform_device *pdev)
158 {
159 return led_classdev_register(&pdev->dev, &clevo_mail_led);
160 }
161
clevo_mail_led_remove(struct platform_device * pdev)162 static void clevo_mail_led_remove(struct platform_device *pdev)
163 {
164 led_classdev_unregister(&clevo_mail_led);
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