drivers/leds/leds-clevo-mail.c

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