drivers/hid/hid-picolcd_leds.c

   1 /***************************************************************************
   2  *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
   3  *                                                                         *
   4  *   Based on Logitech G13 driver (v0.4)                                   *
   5  *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
   6  *                                                                         *
   7  *   This program is free software: you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation, version 2 of the License.               *
  10  *                                                                         *
  11  *   This driver is distributed in the hope that it will be useful, but    *
  12  *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
  14  *   General Public License for more details.                              *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
  18  ***************************************************************************/
  19
  20 #include <linux/hid.h>
  21 #include <linux/hid-debug.h>
  22 #include <linux/input.h>
  23 #include "hid-ids.h"
  24 #include "usbhid/usbhid.h"
  25 #include <linux/usb.h>
  26
  27 #include <linux/fb.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/backlight.h>
  30 #include <linux/lcd.h>
  31
  32 #include <linux/leds.h>
  33
  34 #include <linux/seq_file.h>
  35 #include <linux/debugfs.h>
  36
  37 #include <linux/completion.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/module.h>
  40
  41 #include "hid-picolcd.h"
  42
  43
  44 void picolcd_leds_set(struct picolcd_data *data)
  45 {
  46         struct hid_report *report;
  47         unsigned long flags;
  48
  49         if (!data->led[0])
  50                 return;
  51         report = picolcd_out_report(REPORT_LED_STATE, data->hdev);
  52         if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
  53                 return;
  54
  55         spin_lock_irqsave(&data->lock, flags);
  56         hid_set_field(report->field[0], 0, data->led_state);
  57         if (!(data->status & PICOLCD_FAILED))
  58                 usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
  59         spin_unlock_irqrestore(&data->lock, flags);
  60 }
  61
  62 static void picolcd_led_set_brightness(struct led_classdev *led_cdev,
  63                         enum led_brightness value)
  64 {
  65         struct device *dev;
  66         struct hid_device *hdev;
  67         struct picolcd_data *data;
  68         int i, state = 0;
  69
  70         dev  = led_cdev->dev->parent;
  71         hdev = container_of(dev, struct hid_device, dev);
  72         data = hid_get_drvdata(hdev);
  73         if (!data)
  74                 return;
  75         for (i = 0; i < 8; i++) {
  76                 if (led_cdev != data->led[i])
  77                         continue;
  78                 state = (data->led_state >> i) & 1;
  79                 if (value == LED_OFF && state) {
  80                         data->led_state &= ~(1 << i);
  81                         picolcd_leds_set(data);
  82                 } else if (value != LED_OFF && !state) {
  83                         data->led_state |= 1 << i;
  84                         picolcd_leds_set(data);
  85                 }
  86                 break;
  87         }
  88 }
  89
  90 static enum led_brightness picolcd_led_get_brightness(struct led_classdev *led_cdev)
  91 {
  92         struct device *dev;
  93         struct hid_device *hdev;
  94         struct picolcd_data *data;
  95         int i, value = 0;
  96
  97         dev  = led_cdev->dev->parent;
  98         hdev = container_of(dev, struct hid_device, dev);
  99         data = hid_get_drvdata(hdev);
 100         for (i = 0; i < 8; i++)
 101                 if (led_cdev == data->led[i]) {
 102                         value = (data->led_state >> i) & 1;
 103                         break;
 104                 }
 105         return value ? LED_FULL : LED_OFF;
 106 }
 107
 108 int picolcd_init_leds(struct picolcd_data *data, struct hid_report *report)
 109 {
 110         struct device *dev = &data->hdev->dev;
 111         struct led_classdev *led;
 112         size_t name_sz = strlen(dev_name(dev)) + 8;
 113         char *name;
 114         int i, ret = 0;
 115
 116         if (!report)
 117                 return -ENODEV;
 118         if (report->maxfield != 1 || report->field[0]->report_count != 1 ||
 119                         report->field[0]->report_size != 8) {
 120                 dev_err(dev, "unsupported LED_STATE report");
 121                 return -EINVAL;
 122         }
 123
 124         for (i = 0; i < 8; i++) {
 125                 led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 126                 if (!led) {
 127                         dev_err(dev, "can't allocate memory for LED %d\n", i);
 128                         ret = -ENOMEM;
 129                         goto err;
 130                 }
 131                 name = (void *)(&led[1]);
 132                 snprintf(name, name_sz, "%s::GPO%d", dev_name(dev), i);
 133                 led->name = name;
 134                 led->brightness = 0;
 135                 led->max_brightness = 1;
 136                 led->brightness_get = picolcd_led_get_brightness;
 137                 led->brightness_set = picolcd_led_set_brightness;
 138
 139                 data->led[i] = led;
 140                 ret = led_classdev_register(dev, data->led[i]);
 141                 if (ret) {
 142                         data->led[i] = NULL;
 143                         kfree(led);
 144                         dev_err(dev, "can't register LED %d\n", i);
 145                         goto err;
 146                 }
 147         }
 148         return 0;
 149 err:
 150         for (i = 0; i < 8; i++)
 151                 if (data->led[i]) {
 152                         led = data->led[i];
 153                         data->led[i] = NULL;
 154                         led_classdev_unregister(led);
 155                         kfree(led);
 156                 }
 157         return ret;
 158 }
 159
 160 void picolcd_exit_leds(struct picolcd_data *data)
 161 {
 162         struct led_classdev *led;
 163         int i;
 164
 165         for (i = 0; i < 8; i++) {
 166                 led = data->led[i];
 167                 data->led[i] = NULL;
 168                 if (!led)
 169                         continue;
 170                 led_classdev_unregister(led);
 171                 kfree(led);
 172         }
 173 }
 174
 175