rtc: m48t86: add NVRAM support

This RTC has 114 bytes of NVRAM. Provide access to it via a binary
sysfs 'nvram' attribute file.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-m48t86.c b/drivers/rtc/rtc-m48t86.c
index 4dcdbd2a2408..4dc4af41c03d 100644
--- a/drivers/rtc/rtc-m48t86.c
+++ b/drivers/rtc/rtc-m48t86.c
@@ -38,6 +38,8 @@
 #define M48T86_C                0x0c
 #define M48T86_D                0x0d
 #define M48T86_D_VRT            BIT(7)
+#define M48T86_NVRAM(x)         (0x0e + (x))
+#define M48T86_NVRAM_LEN        114
 
 struct m48t86_rtc_info {
         void __iomem *index_reg;
@@ -170,6 +172,35 @@ static const struct rtc_class_ops m48t86_rtc_ops = {
         .proc           = m48t86_rtc_proc,
 };
 
+static ssize_t m48t86_nvram_read(struct file *filp, struct kobject *kobj,
+                                 struct bin_attribute *attr,
+                                 char *buf, loff_t off, size_t count)
+{
+        struct device *dev = kobj_to_dev(kobj);
+        unsigned int i;
+
+        for (i = 0; i < count; i++)
+                buf[i] = m48t86_readb(dev, M48T86_NVRAM(off + i));
+
+        return count;
+}
+
+static ssize_t m48t86_nvram_write(struct file *filp, struct kobject *kobj,
+                                  struct bin_attribute *attr,
+                                  char *buf, loff_t off, size_t count)
+{
+        struct device *dev = kobj_to_dev(kobj);
+        unsigned int i;
+
+        for (i = 0; i < count; i++)
+                m48t86_writeb(dev, buf[i], M48T86_NVRAM(off + i));
+
+        return count;
+}
+
+static BIN_ATTR(nvram, 0644, m48t86_nvram_read, m48t86_nvram_write,
+                M48T86_NVRAM_LEN);
+
 static int m48t86_rtc_probe(struct platform_device *pdev)
 {
         struct m48t86_rtc_info *info;
@@ -210,6 +241,15 @@ static int m48t86_rtc_probe(struct platform_device *pdev)
         dev_info(&pdev->dev, "battery %s\n",
                  (reg & M48T86_D_VRT) ? "ok" : "exhausted");
 
+        if (device_create_bin_file(&pdev->dev, &bin_attr_nvram))
+                dev_err(&pdev->dev, "failed to create nvram sysfs entry\n");
+
+        return 0;
+}
+
+static int m48t86_rtc_remove(struct platform_device *pdev)
+{
+        device_remove_bin_file(&pdev->dev, &bin_attr_nvram);
         return 0;
 }
 
@@ -218,6 +258,7 @@ static struct platform_driver m48t86_rtc_platform_driver = {
                 .name   = "rtc-m48t86",
         },
         .probe          = m48t86_rtc_probe,
+        .remove         = m48t86_rtc_remove,
 };
 
 module_platform_driver(m48t86_rtc_platform_driver);