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); 217