[ARM] msm: vreg interface to msm7k pmic

The baseband cpu owns the pmic, so voltage regulator control is only
available via a relatively limited interface through the proc_comm
transport.
Signed-off-by: Brian Swetland <swetland@google.com>

arch/arm/mach-msm/Makefile

 obj-y += io.o idle.o irq.o timer.o dma.o
 obj-y += devices.o
 obj-y += proc_comm.o
+obj-y += vreg.o
 obj-y += clock.o clock-7x01a.o
 
 obj-$(CONFIG_MACH_HALIBUT) += board-halibut.o

arch/arm/mach-msm/include/mach/vreg.h

+/* linux/include/asm-arm/arch-msm/vreg.h
+ *
+ * Copyright (C) 2008 Google, Inc.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __ARCH_ARM_MACH_MSM_VREG_H
+#define __ARCH_ARM_MACH_MSM_VREG_H
+
+struct vreg;
+
+struct vreg *vreg_get(struct device *dev, const char *id);
+void vreg_put(struct vreg *vreg);
+
+int vreg_enable(struct vreg *vreg);
+void vreg_disable(struct vreg *vreg);
+int vreg_set_level(struct vreg *vreg, unsigned mv);
+
+#endif

arch/arm/mach-msm/vreg.c

+/* arch/arm/mach-msm/vreg.c
+ *
+ * Copyright (C) 2008 Google, Inc.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <mach/vreg.h>
+
+#include "proc_comm.h"
+
+struct vreg {
+	const char *name;
+	unsigned id;
+};
+
+#define VREG(_name, _id) { .name = _name, .id = _id, }
+
+static struct vreg vregs[] = {
+	VREG("msma",	0),
+	VREG("msmp",	1),
+	VREG("msme1",	2),
+	VREG("msmc1",	3),
+	VREG("msmc2",	4),
+	VREG("gp3",	5),
+	VREG("msme2",	6),
+	VREG("gp4",	7),
+	VREG("gp1",	8),
+	VREG("tcxo",	9),
+	VREG("pa",	10),
+	VREG("rftx",	11),
+	VREG("rfrx1",	12),
+	VREG("rfrx2",	13),
+	VREG("synt",	14),
+	VREG("wlan",	15),
+	VREG("usb",	16),
+	VREG("boost",	17),
+	VREG("mmc",	18),
+	VREG("ruim",	19),
+	VREG("msmc0",	20),
+	VREG("gp2",	21),
+	VREG("gp5",	22),
+	VREG("gp6",	23),
+	VREG("rf",	24),
+	VREG("rf_vco",	26),
+	VREG("mpll",	27),
+	VREG("s2",	28),
+	VREG("s3",	29),
+	VREG("rfubm",	30),
+	VREG("ncp",	31),
+};
+
+struct vreg *vreg_get(struct device *dev, const char *id)
+{
+	int n;
+	for (n = 0; n < ARRAY_SIZE(vregs); n++) {
+		if (!strcmp(vregs[n].name, id))
+			return vregs + n;
+	}
+	return 0;
+}
+
+void vreg_put(struct vreg *vreg)
+{
+}
+
+int vreg_enable(struct vreg *vreg)
+{
+	unsigned id = vreg->id;
+	unsigned enable = 1;
+	return msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
+}
+
+void vreg_disable(struct vreg *vreg)
+{
+	unsigned id = vreg->id;
+	unsigned enable = 0;
+	msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
+}
+
+int vreg_set_level(struct vreg *vreg, unsigned mv)
+{
+	unsigned id = vreg->id;
+	return msm_proc_comm(PCOM_VREG_SET_LEVEL, &id, &mv);
+}
+
+#if defined(CONFIG_DEBUG_FS)
+
+static int vreg_debug_set(void *data, u64 val)
+{
+	struct vreg *vreg = data;
+	switch (val) {
+	case 0:
+		vreg_disable(vreg);
+		break;
+	case 1:
+		vreg_enable(vreg);
+		break;
+	default:
+		vreg_set_level(vreg, val);
+		break;
+	}
+	return 0;
+}
+
+static int vreg_debug_get(void *data, u64 *val)
+{
+	return -ENOSYS;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(vreg_fops, vreg_debug_get, vreg_debug_set, "%llu\n");
+
+static int __init vreg_debug_init(void)
+{
+	struct dentry *dent;
+	int n;
+
+	dent = debugfs_create_dir("vreg", 0);
+	if (IS_ERR(dent))
+		return 0;
+
+	for (n = 0; n < ARRAY_SIZE(vregs); n++)
+		(void) debugfs_create_file(vregs[n].name, 0644,
+					   dent, vregs + n, &vreg_fops);
+
+	return 0;
+}
+
+device_initcall(vreg_debug_init);
+#endif