[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>

3 files changed, 173 insertions, 0 deletions

diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index bfcb2518ba5..1aa47001aa3 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/arch/arm/mach-msm/Makefile
@@ -1,6 +1,7 @@
 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
diff --git a/arch/arm/mach-msm/include/mach/vreg.h b/arch/arm/mach-msm/include/mach/vreg.h
new file mode 100644
index 00000000000..9f9e25cb718
--- /dev/null
+++ b/arch/arm/mach-msm/include/mach/vreg.h
@@ -0,0 +1,29 @@
+/* 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
diff --git a/arch/arm/mach-msm/vreg.c b/arch/arm/mach-msm/vreg.c
new file mode 100644
index 00000000000..fcb0b9f2568
--- /dev/null
+++ b/arch/arm/mach-msm/vreg.c
@@ -0,0 +1,143 @@
+/* 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