Merge tag 'iio-for-4.15a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[linux-2.6-microblaze.git] / drivers / leds / leds-clevo-mail.c
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);