Annotation of prex/dev/power/pm.c, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 2005, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * pm.c - power management driver (hardware independent)
! 32: */
! 33:
! 34: #include <sys/ioctl.h>
! 35: #include <driver.h>
! 36: #include <machdep.h>
! 37: #include <event.h>
! 38: #include <pm.h>
! 39: #include <cpufreq.h>
! 40:
! 41: /* #define DEBUG_PM 1 */
! 42:
! 43: #ifdef DEBUG_PM
! 44: #define DPRINTF(a) printf a
! 45: #else
! 46: #define DPRINTF(a)
! 47: #endif
! 48:
! 49: #ifdef CONFIG_PM_POWERSAVE
! 50: #define DEFAULT_POWER_POLICY PM_POWERSAVE
! 51: #else
! 52: #define DEFAULT_POWER_POLICY PM_PERFORMANCE
! 53: #endif
! 54:
! 55: static int pm_open(device_t dev, int mode);
! 56: static int pm_ioctl(device_t dev, u_long cmd, void *arg);
! 57: static int pm_close(device_t dev);
! 58: static int pm_init(void);
! 59:
! 60: /*
! 61: * Driver structure
! 62: */
! 63: struct driver pm_drv = {
! 64: /* name */ "Power Management",
! 65: /* order */ 2,
! 66: /* init */ pm_init,
! 67: };
! 68:
! 69: /*
! 70: * Device I/O table
! 71: */
! 72: static struct devio pm_io = {
! 73: /* open */ pm_open,
! 74: /* close */ pm_close,
! 75: /* read */ NULL,
! 76: /* write */ NULL,
! 77: /* ioctl */ pm_ioctl,
! 78: /* event */ NULL,
! 79: };
! 80:
! 81: static device_t pm_dev; /* Device object */
! 82: static int nr_open; /* Open count */
! 83:
! 84: /*
! 85: * Power mangement policy
! 86: */
! 87: static int power_policy;
! 88:
! 89: /*
! 90: * Idle timer
! 91: */
! 92: static struct timer idle_timer;
! 93: static u_long idle_count; /* Idling counter in sec */
! 94: static u_long suspend_timeout; /* Time until auto suspend in sec */
! 95:
! 96: /*
! 97: * Set system to suspend state
! 98: * Call to all devices and architecture depended code.
! 99: */
! 100: int
! 101: pm_suspend(void)
! 102: {
! 103: int err;
! 104:
! 105: DPRINTF(("Suspend system\n"));
! 106: err = device_broadcast(EVT_SUSPEND, 1);
! 107: if (err)
! 108: return err;
! 109: machine_suspend();
! 110: return 0;
! 111: }
! 112:
! 113: /*
! 114: * Resume
! 115: */
! 116: int
! 117: pm_resume(void)
! 118: {
! 119:
! 120: DPRINTF(("Resume system\n"));
! 121: device_broadcast(EVT_RESUME, 1);
! 122: return 0;
! 123: }
! 124:
! 125: /*
! 126: * Power off system
! 127: * Call to all devices and architecture depended code.
! 128: */
! 129: int
! 130: pm_poweroff(void)
! 131: {
! 132: int err;
! 133:
! 134: #ifdef DEBUG
! 135: printf("power off...\n");
! 136: #endif
! 137: err = device_broadcast(EVT_SHUTDOWN, 1);
! 138: if (err)
! 139: return err;
! 140: machine_poweroff();
! 141: return 0;
! 142: }
! 143:
! 144: /*
! 145: * Reboot system.
! 146: */
! 147: int
! 148: pm_reboot(void)
! 149: {
! 150: int err;
! 151:
! 152: #ifdef DEBUG
! 153: printf("rebooting...\n");
! 154: #endif
! 155: err = device_broadcast(EVT_SHUTDOWN, 1);
! 156: if (err)
! 157: return err;
! 158:
! 159: irq_lock();
! 160:
! 161: /*
! 162: * Do reset.
! 163: */
! 164: machine_reset();
! 165: return 0;
! 166: }
! 167:
! 168: /*
! 169: * Idle timer handler.
! 170: */
! 171: static void
! 172: idle_timeout(void *arg)
! 173: {
! 174:
! 175: irq_lock();
! 176: idle_count++;
! 177: irq_unlock();
! 178: if (idle_count >= suspend_timeout)
! 179: pm_suspend();
! 180: else
! 181: timer_callout(&idle_timer, 1000, &idle_timeout, NULL);
! 182: }
! 183:
! 184: #if 0
! 185: /*
! 186: * Set suspend timer.
! 187: */
! 188: static int
! 189: pm_settimer(u_long sec)
! 190: {
! 191:
! 192: sched_lock();
! 193: if (sec)
! 194: timer_callout(&idle_timer, 1000, &idle_timeout, NULL);
! 195: else
! 196: timer_stop(&idle_timer);
! 197: idle_count = 0;
! 198: suspend_timeout = sec;
! 199: sched_unlock();
! 200: return 0;
! 201: }
! 202:
! 203: /*
! 204: * Get power management timer.
! 205: */
! 206: static int
! 207: pm_gettimer(u_long *sec)
! 208: {
! 209:
! 210: *sec = suspend_timeout;
! 211: return 0;
! 212: }
! 213: #endif
! 214:
! 215: /*
! 216: * Reload idle timer.
! 217: *
! 218: * A keyboard or mouse driver will call this routine when
! 219: * it detect the user activity like key press or mouse move.
! 220: */
! 221: void
! 222: pm_active(void)
! 223: {
! 224:
! 225: idle_count = 0;
! 226: }
! 227:
! 228: /*
! 229: * Set power policy.
! 230: */
! 231: static int
! 232: pm_setpolicy(int policy)
! 233: {
! 234:
! 235: if (policy != PM_POWERSAVE && policy != PM_PERFORMANCE)
! 236: return EINVAL;
! 237: #ifdef CONFIG_CPUFREQ
! 238: cpufreq_setpolicy(policy);
! 239: #endif
! 240: power_policy = policy;
! 241: return 0;
! 242: }
! 243:
! 244: /*
! 245: * Get current power policy.
! 246: */
! 247: int
! 248: pm_getpolicy(void)
! 249: {
! 250:
! 251: return power_policy;
! 252: }
! 253:
! 254: /*
! 255: * Open the pm device.
! 256: *
! 257: * The open operation is allowed to only one task. This can protect
! 258: * the critical ioctl operation from some malicious tasks. For example,
! 259: * the power off should be done by the privileged task like a process
! 260: * server.
! 261: */
! 262: static int
! 263: pm_open(device_t dev, int mode)
! 264: {
! 265:
! 266: if (nr_open > 0)
! 267: return EBUSY;
! 268: nr_open++;
! 269: return 0;
! 270: }
! 271:
! 272: static int
! 273: pm_close(device_t dev)
! 274: {
! 275:
! 276: if (nr_open != 1)
! 277: return EINVAL;
! 278: nr_open--;
! 279: return 0;
! 280: }
! 281:
! 282: static int
! 283: pm_ioctl(device_t dev, u_long cmd, void *arg)
! 284: {
! 285: int err = 0;
! 286: int policy, subcmd;
! 287:
! 288: switch (cmd) {
! 289: case PMIOC_SET_POWER:
! 290: if (umem_copyin(arg, &subcmd, sizeof(int)))
! 291: return EFAULT;
! 292:
! 293: switch (subcmd) {
! 294: case POWER_SUSPEND:
! 295: pm_suspend();
! 296: break;
! 297: case POWER_OFF:
! 298: pm_poweroff();
! 299: break;
! 300: case POWER_REBOOT:
! 301: pm_reboot();
! 302: break;
! 303: default:
! 304: return EINVAL;
! 305: }
! 306: break;
! 307:
! 308: case PMIOC_SET_POLICY:
! 309: if (umem_copyin(arg, &policy, sizeof(int)))
! 310: return EFAULT;
! 311: err = pm_setpolicy(policy);
! 312: break;
! 313:
! 314: case PMIOC_GET_POLICY:
! 315: policy = pm_getpolicy();
! 316: if (umem_copyout(&policy, arg, sizeof(int)))
! 317: return EFAULT;
! 318: break;
! 319: default:
! 320: return EINVAL;
! 321: }
! 322: return err;
! 323: }
! 324:
! 325: /*
! 326: * Initialize
! 327: */
! 328: static int
! 329: pm_init(void)
! 330: {
! 331:
! 332: /* Create device object */
! 333: pm_dev = device_create(&pm_io, "pm", DF_CHR);
! 334: ASSERT(pm_dev);
! 335:
! 336: nr_open = 0;
! 337: idle_count = 0;
! 338: suspend_timeout = 0;
! 339: power_policy = DEFAULT_POWER_POLICY;
! 340: timer_init(&idle_timer);
! 341: #ifdef DEBUG
! 342: printf("pm: Default power policy is %s mode\n",
! 343: (power_policy == PM_POWERSAVE) ? "power save" : "performance");
! 344: #endif
! 345: return 0;
! 346: }
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