kernel/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 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
  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);