1 /* 2 * via-pmu LED class device 3 * 4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program 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, GOOD TITLE or 14 * NON INFRINGEMENT. See the GNU General Public License for more 15 * details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 20 * 21 */ 22 #include <linux/types.h> 23 #include <linux/kernel.h> 24 #include <linux/device.h> 25 #include <linux/leds.h> 26 #include <linux/adb.h> 27 #include <linux/pmu.h> 28 #include <linux/of.h> 29 30 static spinlock_t pmu_blink_lock; 31 static struct adb_request pmu_blink_req; 32 /* -1: no change, 0: request off, 1: request on */ 33 static int requested_change; 34 35 static void pmu_req_done(struct adb_request * req) 36 { 37 unsigned long flags; 38 39 spin_lock_irqsave(&pmu_blink_lock, flags); 40 /* if someone requested a change in the meantime 41 * (we only see the last one which is fine) 42 * then apply it now */ 43 if (requested_change != -1 && !pmu_sys_suspended) 44 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change); 45 /* reset requested change */ 46 requested_change = -1; 47 spin_unlock_irqrestore(&pmu_blink_lock, flags); 48 } 49 50 static void pmu_led_set(struct led_classdev *led_cdev, 51 enum led_brightness brightness) 52 { 53 unsigned long flags; 54 55 spin_lock_irqsave(&pmu_blink_lock, flags); 56 switch (brightness) { 57 case LED_OFF: 58 requested_change = 0; 59 break; 60 case LED_FULL: 61 requested_change = 1; 62 break; 63 default: 64 goto out; 65 break; 66 } 67 /* if request isn't done, then don't do anything */ 68 if (pmu_blink_req.complete && !pmu_sys_suspended) 69 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change); 70 out: 71 spin_unlock_irqrestore(&pmu_blink_lock, flags); 72 } 73 74 static struct led_classdev pmu_led = { 75 .name = "pmu-led::front", 76 #ifdef CONFIG_ADB_PMU_LED_DISK 77 .default_trigger = "disk-activity", 78 #endif 79 .brightness_set = pmu_led_set, 80 }; 81 82 static int __init via_pmu_led_init(void) 83 { 84 struct device_node *dt; 85 const char *model; 86 87 /* only do this on keylargo based models */ 88 if (pmu_get_model() != PMU_KEYLARGO_BASED) 89 return -ENODEV; 90 91 dt = of_find_node_by_path("/"); 92 if (dt == NULL) 93 return -ENODEV; 94 model = of_get_property(dt, "model", NULL); 95 if (model == NULL) { 96 of_node_put(dt); 97 return -ENODEV; 98 } 99 if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 && 100 strncmp(model, "iBook", strlen("iBook")) != 0 && 101 strcmp(model, "PowerMac7,2") != 0 && 102 strcmp(model, "PowerMac7,3") != 0) { 103 of_node_put(dt); 104 /* ignore */ 105 return -ENODEV; 106 } 107 of_node_put(dt); 108 109 spin_lock_init(&pmu_blink_lock); 110 /* no outstanding req */ 111 pmu_blink_req.complete = 1; 112 pmu_blink_req.done = pmu_req_done; 113 114 return led_classdev_register(NULL, &pmu_led); 115 } 116 117 late_initcall(via_pmu_led_init); 118