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 <[email protected]>");
  18 MODULE_DESCRIPTION("Clevo mail LED driver");
  19 MODULE_LICENSE("GPL");
  20
  21 static bool __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 clevo_mail_led_dmi_table - 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 clevo_mail_led_dmi_table[] = {
  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 = "Clevo M5x0V",
  63                 .matches = {
  64                         DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
  65                         DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
  66                         DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
  67                 }
  68         },
  69         {
  70                 .callback = clevo_mail_led_dmi_callback,
  71                 .ident = "Clevo D400P",
  72                 .matches = {
  73                         DMI_MATCH(DMI_BOARD_VENDOR, "Clevo"),
  74                         DMI_MATCH(DMI_BOARD_NAME, "D400P"),
  75                         DMI_MATCH(DMI_BOARD_VERSION, "Rev.A"),
  76                         DMI_MATCH(DMI_PRODUCT_VERSION, "0106")
  77                 }
  78         },
  79         {
  80                 .callback = clevo_mail_led_dmi_callback,
  81                 .ident = "Clevo D410V",
  82                 .matches = {
  83                         DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
  84                         DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
  85                         DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
  86                         DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
  87                 }
  88         },
  89         { }
  90 };
  91 MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);
  92
  93 static void clevo_mail_led_set(struct led_classdev *led_cdev,
  94                                 enum led_brightness value)
  95 {
  96         i8042_lock_chip();
  97
  98         if (value == LED_OFF)
  99                 i8042_command(NULL, CLEVO_MAIL_LED_OFF);
 100         else if (value <= LED_HALF)
 101                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
 102         else
 103                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
 104
 105         i8042_unlock_chip();
 106
 107 }
 108
 109 static int clevo_mail_led_blink(struct led_classdev *led_cdev,
 110                                 unsigned long *delay_on,
 111                                 unsigned long *delay_off)
 112 {
 113         int status = -EINVAL;
 114
 115         i8042_lock_chip();
 116
 117         if (*delay_on == 0 /* ms */ && *delay_off == 0 /* ms */) {
 118                 /* Special case: the leds subsystem requested us to
 119                  * chose one user friendly blinking of the LED, and
 120                  * start it. Let's blink the led slowly (0.5Hz).
 121                  */
 122                 *delay_on = 1000; /* ms */
 123                 *delay_off = 1000; /* ms */
 124                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
 125                 status = 0;
 126
 127         } else if (*delay_on == 500 /* ms */ && *delay_off == 500 /* ms */) {
 128                 /* blink the led with 1Hz */
 129                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
 130                 status = 0;
 131
 132         } else if (*delay_on == 1000 /* ms */ && *delay_off == 1000 /* ms */) {
 133                 /* blink the led with 0.5Hz */
 134                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
 135                 status = 0;
 136
 137         } else {
 138                 printk(KERN_DEBUG KBUILD_MODNAME
 139                        ": 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 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         .probe          = clevo_mail_led_probe,
 169         .remove         = clevo_mail_led_remove,
 170         .driver         = {
 171                 .name           = KBUILD_MODNAME,
 172                 .owner          = THIS_MODULE,
 173         },
 174 };
 175
 176 static int __init clevo_mail_led_init(void)
 177 {
 178         int error = 0;
 179         int count = 0;
 180
 181         /* Check with the help of DMI if we are running on supported hardware */
 182         if (!nodetect) {
 183                 count = dmi_check_system(clevo_mail_led_dmi_table);
 184         } else {
 185                 count = 1;
 186                 printk(KERN_ERR KBUILD_MODNAME ": Skipping DMI detection. "
 187                        "If the driver works on your hardware please "
 188                        "report model and the output of dmidecode in tracker "
 189                        "at http://sourceforge.net/projects/clevo-mailled/\n");
 190         }
 191
 192         if (!count)
 193                 return -ENODEV;
 194
 195         pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
 196         if (!IS_ERR(pdev)) {
 197                 error = platform_driver_probe(&clevo_mail_led_driver,
 198                                               clevo_mail_led_probe);
 199                 if (error) {
 200                         printk(KERN_ERR KBUILD_MODNAME
 201                                ": Can't probe platform driver\n");
 202                         platform_device_unregister(pdev);
 203                 }
 204         } else
 205                 error = PTR_ERR(pdev);
 206
 207         return error;
 208 }
 209
 210 static void __exit clevo_mail_led_exit(void)
 211 {
 212         platform_device_unregister(pdev);
 213         platform_driver_unregister(&clevo_mail_led_driver);
 214
 215         clevo_mail_led_set(NULL, LED_OFF);
 216 }
 217
 218 module_init(clevo_mail_led_init);
 219 module_exit(clevo_mail_led_exit);