bridge: fix a possible use after free
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / macintosh / ams / ams-pmu.c
blob4f61b3ee1b08b4ca0ee65f018becb0ef7128892e
1 /*
2 * Apple Motion Sensor driver (PMU variant)
4 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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.
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/adb.h>
17 #include <linux/pmu.h>
19 #include "ams.h"
21 /* Attitude */
22 #define AMS_X 0x00
23 #define AMS_Y 0x01
24 #define AMS_Z 0x02
26 /* Not exactly known, maybe chip vendor */
27 #define AMS_VENDOR 0x03
29 /* Freefall registers */
30 #define AMS_FF_CLEAR 0x04
31 #define AMS_FF_ENABLE 0x05
32 #define AMS_FF_LOW_LIMIT 0x06
33 #define AMS_FF_DEBOUNCE 0x07
35 /* Shock registers */
36 #define AMS_SHOCK_CLEAR 0x08
37 #define AMS_SHOCK_ENABLE 0x09
38 #define AMS_SHOCK_HIGH_LIMIT 0x0a
39 #define AMS_SHOCK_DEBOUNCE 0x0b
41 /* Global interrupt and power control register */
42 #define AMS_CONTROL 0x0c
44 static u8 ams_pmu_cmd;
46 static void ams_pmu_req_complete(struct adb_request *req)
48 complete((struct completion *)req->arg);
51 /* Only call this function from task context */
52 static void ams_pmu_set_register(u8 reg, u8 value)
54 static struct adb_request req;
55 DECLARE_COMPLETION(req_complete);
57 req.arg = &req_complete;
58 if (pmu_request(&req, ams_pmu_req_complete, 4, ams_pmu_cmd, 0x00, reg, value))
59 return;
61 wait_for_completion(&req_complete);
64 /* Only call this function from task context */
65 static u8 ams_pmu_get_register(u8 reg)
67 static struct adb_request req;
68 DECLARE_COMPLETION(req_complete);
70 req.arg = &req_complete;
71 if (pmu_request(&req, ams_pmu_req_complete, 3, ams_pmu_cmd, 0x01, reg))
72 return 0;
74 wait_for_completion(&req_complete);
76 if (req.reply_len > 0)
77 return req.reply[0];
78 else
79 return 0;
82 /* Enables or disables the specified interrupts */
83 static void ams_pmu_set_irq(enum ams_irq reg, char enable)
85 if (reg & AMS_IRQ_FREEFALL) {
86 u8 val = ams_pmu_get_register(AMS_FF_ENABLE);
87 if (enable)
88 val |= 0x80;
89 else
90 val &= ~0x80;
91 ams_pmu_set_register(AMS_FF_ENABLE, val);
94 if (reg & AMS_IRQ_SHOCK) {
95 u8 val = ams_pmu_get_register(AMS_SHOCK_ENABLE);
96 if (enable)
97 val |= 0x80;
98 else
99 val &= ~0x80;
100 ams_pmu_set_register(AMS_SHOCK_ENABLE, val);
103 if (reg & AMS_IRQ_GLOBAL) {
104 u8 val = ams_pmu_get_register(AMS_CONTROL);
105 if (enable)
106 val |= 0x80;
107 else
108 val &= ~0x80;
109 ams_pmu_set_register(AMS_CONTROL, val);
113 static void ams_pmu_clear_irq(enum ams_irq reg)
115 if (reg & AMS_IRQ_FREEFALL)
116 ams_pmu_set_register(AMS_FF_CLEAR, 0x00);
118 if (reg & AMS_IRQ_SHOCK)
119 ams_pmu_set_register(AMS_SHOCK_CLEAR, 0x00);
122 static u8 ams_pmu_get_vendor(void)
124 return ams_pmu_get_register(AMS_VENDOR);
127 static void ams_pmu_get_xyz(s8 *x, s8 *y, s8 *z)
129 *x = ams_pmu_get_register(AMS_X);
130 *y = ams_pmu_get_register(AMS_Y);
131 *z = ams_pmu_get_register(AMS_Z);
134 static void ams_pmu_exit(void)
136 ams_sensor_detach();
138 /* Disable interrupts */
139 ams_pmu_set_irq(AMS_IRQ_ALL, 0);
141 /* Clear interrupts */
142 ams_pmu_clear_irq(AMS_IRQ_ALL);
144 ams_info.has_device = 0;
146 printk(KERN_INFO "ams: Unloading\n");
149 int __init ams_pmu_init(struct device_node *np)
151 const u32 *prop;
152 int result;
154 /* Set implementation stuff */
155 ams_info.of_node = np;
156 ams_info.exit = ams_pmu_exit;
157 ams_info.get_vendor = ams_pmu_get_vendor;
158 ams_info.get_xyz = ams_pmu_get_xyz;
159 ams_info.clear_irq = ams_pmu_clear_irq;
160 ams_info.bustype = BUS_HOST;
162 /* Get PMU command, should be 0x4e, but we can never know */
163 prop = of_get_property(ams_info.of_node, "reg", NULL);
164 if (!prop)
165 return -ENODEV;
167 ams_pmu_cmd = ((*prop) >> 8) & 0xff;
169 /* Disable interrupts */
170 ams_pmu_set_irq(AMS_IRQ_ALL, 0);
172 /* Clear interrupts */
173 ams_pmu_clear_irq(AMS_IRQ_ALL);
175 result = ams_sensor_attach();
176 if (result < 0)
177 return result;
179 /* Set default values */
180 ams_pmu_set_register(AMS_FF_LOW_LIMIT, 0x15);
181 ams_pmu_set_register(AMS_FF_ENABLE, 0x08);
182 ams_pmu_set_register(AMS_FF_DEBOUNCE, 0x14);
184 ams_pmu_set_register(AMS_SHOCK_HIGH_LIMIT, 0x60);
185 ams_pmu_set_register(AMS_SHOCK_ENABLE, 0x0f);
186 ams_pmu_set_register(AMS_SHOCK_DEBOUNCE, 0x14);
188 ams_pmu_set_register(AMS_CONTROL, 0x4f);
190 /* Clear interrupts */
191 ams_pmu_clear_irq(AMS_IRQ_ALL);
193 ams_info.has_device = 1;
195 /* Enable interrupts */
196 ams_pmu_set_irq(AMS_IRQ_ALL, 1);
198 printk(KERN_INFO "ams: Found PMU based motion sensor\n");
200 return 0;