af328516561eef19893a8673c2512bab589f3a58
[linux-2.6.git] / drivers / gpu / drm / gma500 / psb_lid.c
1 /**************************************************************************
2  * Copyright (c) 2007, Intel Corporation.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16  *
17  * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
18  **************************************************************************/
19
20 #include <drm/drmP.h>
21 #include "psb_drv.h"
22 #include "psb_reg.h"
23 #include "psb_intel_reg.h"
24 #include <linux/spinlock.h>
25
26 static void psb_lid_timer_func(unsigned long data)
27 {
28         struct drm_psb_private * dev_priv = (struct drm_psb_private *)data;
29         struct drm_device *dev = (struct drm_device *)dev_priv->dev;
30         struct timer_list *lid_timer = &dev_priv->lid_timer;
31         unsigned long irq_flags;
32         u32 *lid_state = dev_priv->lid_state;
33         u32 pp_status;
34
35         if (readl(lid_state) == dev_priv->lid_last_state)
36                 goto lid_timer_schedule;
37
38         if ((readl(lid_state)) & 0x01) {
39                 /*lid state is open*/
40                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
41                 do {
42                         pp_status = REG_READ(PP_STATUS);
43                 } while ((pp_status & PP_ON) == 0);
44
45                 /*FIXME: should be backlight level before*/
46                 psb_intel_lvds_set_brightness(dev, 100);
47         } else {
48                 psb_intel_lvds_set_brightness(dev, 0);
49
50                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & ~POWER_TARGET_ON);
51                 do {
52                         pp_status = REG_READ(PP_STATUS);
53                 } while ((pp_status & PP_ON) == 0);
54         }
55                 /* printk(KERN_INFO"%s: lid: closed\n", __FUNCTION__); */
56
57         dev_priv->lid_last_state =  readl(lid_state);
58
59 lid_timer_schedule:
60         spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
61         if (!timer_pending(lid_timer)) {
62                 lid_timer->expires = jiffies + PSB_LID_DELAY;
63                 add_timer(lid_timer);
64         }
65         spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
66 }
67
68 void psb_lid_timer_init(struct drm_psb_private *dev_priv)
69 {
70         struct timer_list *lid_timer = &dev_priv->lid_timer;
71         unsigned long irq_flags;
72
73         spin_lock_init(&dev_priv->lid_lock);
74         spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
75
76         init_timer(lid_timer);
77
78         lid_timer->data = (unsigned long)dev_priv;
79         lid_timer->function = psb_lid_timer_func;
80         lid_timer->expires = jiffies + PSB_LID_DELAY;
81
82         add_timer(lid_timer);
83         spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
84 }
85
86 void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
87 {
88         del_timer_sync(&dev_priv->lid_timer);
89 }
90