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Linux/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                 .owner          = THIS_MODULE,
172         },
173 };
174 
175 static int __init clevo_mail_led_init(void)
176 {
177         int error = 0;
178         int count = 0;
179 
180         /* Check with the help of DMI if we are running on supported hardware */
181         if (!nodetect) {
182                 count = dmi_check_system(clevo_mail_led_dmi_table);
183         } else {
184                 count = 1;
185                 pr_err("Skipping DMI detection. "
186                        "If the driver works on your hardware please "
187                        "report model and the output of dmidecode in tracker "
188                        "at http://sourceforge.net/projects/clevo-mailled/\n");
189         }
190 
191         if (!count)
192                 return -ENODEV;
193 
194         pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
195         if (!IS_ERR(pdev)) {
196                 error = platform_driver_probe(&clevo_mail_led_driver,
197                                               clevo_mail_led_probe);
198                 if (error) {
199                         pr_err("Can't probe platform driver\n");
200                         platform_device_unregister(pdev);
201                 }
202         } else
203                 error = PTR_ERR(pdev);
204 
205         return error;
206 }
207 
208 static void __exit clevo_mail_led_exit(void)
209 {
210         platform_device_unregister(pdev);
211         platform_driver_unregister(&clevo_mail_led_driver);
212 
213         clevo_mail_led_set(NULL, LED_OFF);
214 }
215 
216 module_init(clevo_mail_led_init);
217 module_exit(clevo_mail_led_exit);
218 

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