[ARM] msm: add /proc/last_radio_log when supported by the modem.

Signed-off-by: Iliyan Malchev <malchev@google.com>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>

3 files changed, 87 insertions, 0 deletions

diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index 9c3c4019da8a..147339c87277 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/arch/arm/mach-msm/Makefile
@@ -6,6 +6,7 @@ obj-y += acpuclock-arm11.o
 obj-y += clock.o clock-7x01a.o
 
 obj-$(CONFIG_MSM_SMD) += smd.o smd_debug.o
+obj-$(CONFIG_MSM_SMD) += last_radio_log.o
 
 obj-$(CONFIG_MACH_TROUT) += board-trout.o
 obj-$(CONFIG_MACH_HALIBUT) += board-halibut.o
diff --git a/arch/arm/mach-msm/last_radio_log.c b/arch/arm/mach-msm/last_radio_log.c
new file mode 100644
index 000000000000..b64ba5a98686
--- /dev/null
+++ b/arch/arm/mach-msm/last_radio_log.c
@@ -0,0 +1,82 @@
+/* arch/arm/mach-msm/last_radio_log.c
+ *
+ * Extract the log from a modem crash though SMEM
+ *
+ * Copyright (C) 2007 Google, Inc.
+ *
+ * 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/module.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+
+#include "smd_private.h"
+
+static void *radio_log_base;
+static size_t radio_log_size;
+
+extern void *smem_item(unsigned id, unsigned *size);
+
+static ssize_t last_radio_log_read(struct file *file, char __user *buf,
+                        size_t len, loff_t *offset)
+{
+        loff_t pos = *offset;
+        ssize_t count;
+
+        if (pos >= radio_log_size)
+                return 0;
+
+        count = min(len, (size_t)(radio_log_size - pos));
+        if (copy_to_user(buf, radio_log_base + pos, count)) {
+                pr_err("%s: copy to user failed\n", __func__);
+                return -EFAULT;
+        }
+
+        *offset += count;
+        return count;
+}
+
+static struct file_operations last_radio_log_fops = {
+        .read = last_radio_log_read
+};
+
+void msm_init_last_radio_log(struct module *owner)
+{
+        struct proc_dir_entry *entry;
+
+        if (last_radio_log_fops.owner) {
+                pr_err("%s: already claimed\n", __func__);
+                return;
+        }
+
+        radio_log_base = smem_item(SMEM_CLKREGIM_BSP, &radio_log_size);
+        if (!radio_log_base) {
+                pr_err("%s: could not retrieve SMEM_CLKREGIM_BSP\n", __func__);
+                return;
+        }
+
+        entry = create_proc_entry("last_radio_log", S_IFREG | S_IRUGO, NULL);
+        if (!entry) {
+                pr_err("%s: could not create proc entry for radio log\n",
+                                __func__);
+                return;
+        }
+
+        pr_err("%s: last radio log is %d bytes long\n", __func__,
+                radio_log_size);
+        last_radio_log_fops.owner = owner;
+        entry->proc_fops = &last_radio_log_fops;
+        entry->size = radio_log_size;
+}
+EXPORT_SYMBOL(msm_init_last_radio_log);
diff --git a/arch/arm/mach-msm/smd.c b/arch/arm/mach-msm/smd.c
index 34bcc327aa88..655fe42506ca 100644
--- a/arch/arm/mach-msm/smd.c
+++ b/arch/arm/mach-msm/smd.c
@@ -1038,6 +1038,8 @@ int smd_core_init(void)
         return 0;
 }
 
+extern void msm_init_last_radio_log(struct module *);
+
 static int __init msm_smd_probe(struct platform_device *pdev)
 {
         pr_info("smd_init()\n");
@@ -1053,6 +1055,8 @@ static int __init msm_smd_probe(struct platform_device *pdev)
 
         msm_check_for_modem_crash = check_for_modem_crash;
 
+        msm_init_last_radio_log(THIS_MODULE);
+
         smd_initialized = 1;
 
         return 0;