Fixed MTP to work with TWRP

arch/arm/mach-pxa/pm.c

@@ -0,0 +1,118 @@
+/*
+ * PXA250/210 Power Management Routines
+ *
+ * Original code for the SA11x0:
+ * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
+ *
+ * Modified for the PXA250 by Nicolas Pitre:
+ * Copyright (c) 2002 Monta Vista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+#include <mach/pm.h>
+
+struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
+static unsigned long *sleep_save;
+
+int pxa_pm_enter(suspend_state_t state)
+{
+	unsigned long sleep_save_checksum = 0, checksum = 0;
+	int i;
+
+#ifdef CONFIG_IWMMXT
+	/* force any iWMMXt context to ram **/
+	if (elf_hwcap & HWCAP_IWMMXT)
+		iwmmxt_task_disable(NULL);
+#endif
+
+	/* skip registers saving for standby */
+	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
+		pxa_cpu_pm_fns->save(sleep_save);
+		/* before sleeping, calculate and save a checksum */
+		for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
+			sleep_save_checksum += sleep_save[i];
+	}
+
+	/* *** go zzz *** */
+	pxa_cpu_pm_fns->enter(state);
+
+	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
+		/* after sleeping, validate the checksum */
+		for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
+			checksum += sleep_save[i];
+
+		/* if invalid, display message and wait for a hardware reset */
+		if (checksum != sleep_save_checksum) {
+
+			lubbock_set_hexled(0xbadbadc5);
+
+			while (1)
+				pxa_cpu_pm_fns->enter(state);
+		}
+		pxa_cpu_pm_fns->restore(sleep_save);
+	}
+
+	pr_debug("*** made it back from resume\n");
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(pxa_pm_enter);
+
+static int pxa_pm_valid(suspend_state_t state)
+{
+	if (pxa_cpu_pm_fns)
+		return pxa_cpu_pm_fns->valid(state);
+
+	return -EINVAL;
+}
+
+int pxa_pm_prepare(void)
+{
+	int ret = 0;
+
+	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
+		ret = pxa_cpu_pm_fns->prepare();
+
+	return ret;
+}
+
+void pxa_pm_finish(void)
+{
+	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
+		pxa_cpu_pm_fns->finish();
+}
+
+static const struct platform_suspend_ops pxa_pm_ops = {
+	.valid		= pxa_pm_valid,
+	.enter		= pxa_pm_enter,
+	.prepare	= pxa_pm_prepare,
+	.finish		= pxa_pm_finish,
+};
+
+static int __init pxa_pm_init(void)
+{
+	if (!pxa_cpu_pm_fns) {
+		printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
+		return -EINVAL;
+	}
+
+	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
+			     GFP_KERNEL);
+	if (!sleep_save) {
+		printk(KERN_ERR "failed to alloc memory for pm save\n");
+		return -ENOMEM;
+	}
+
+	suspend_set_ops(&pxa_pm_ops);
+	return 0;
+}
+
+device_initcall(pxa_pm_init);