rtc: rtc-rs5c372: add support for Ricoh R2025S/D RTC

[linux-2.6-omap-h63xx.git] / drivers / rtc / rtc-rs5c372.c

diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c
index c390e33555957f933892d2e3fd309cdfddc5df81..8b561958fb1e62056c62ef2aabe37742ab2cd395 100644 (file)
--- a/drivers/rtc/rtc-rs5c372.c
+++ b/drivers/rtc/rtc-rs5c372.c
@@ -1,5 +1,5 @@
 /*
- * An I2C driver for Ricoh RS5C372 and RV5C38[67] RTCs
+ * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs
  *
  * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net>
  * Copyright (C) 2006 Tower Technologies
@@ -52,7 +52,8 @@
 #      define RS5C_CTRL1_CT4           (4 << 0)        /* 1 Hz level irq */
 #define RS5C_REG_CTRL2         15
 #      define RS5C372_CTRL2_24         (1 << 5)
-#      define RS5C_CTRL2_XSTP          (1 << 4)
+#      define R2025_CTRL2_XST          (1 << 5)
+#      define RS5C_CTRL2_XSTP          (1 << 4)        /* only if !R2025S/D */
 #      define RS5C_CTRL2_CTFG          (1 << 2)
 #      define RS5C_CTRL2_AAFG          (1 << 1)        /* or WAFG */
 #      define RS5C_CTRL2_BAFG          (1 << 0)        /* or DAFG */
@@ -64,6 +65,7 @@
 
 enum rtc_type {
        rtc_undef = 0,
+       rtc_r2025sd,
        rtc_rs5c372a,
        rtc_rs5c372b,
        rtc_rv5c386,
@@ -71,6 +73,7 @@ enum rtc_type {
 };
 
 static const struct i2c_device_id rs5c372_id[] = {
+       { "r2025sd", rtc_r2025sd },
        { "rs5c372a", rtc_rs5c372a },
        { "rs5c372b", rtc_rs5c372b },
        { "rv5c386", rtc_rv5c386 },
@@ -531,9 +534,15 @@ static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
        unsigned char buf[2];
        int addr, i, ret = 0;
 
-       if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
-               return ret;
-       rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
+       if (rs5c372->type == rtc_r2025sd) {
+               if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
+                       return ret;
+               rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
+       } else {
+               if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
+                       return ret;
+               rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
+       }
 
        addr   = RS5C_ADDR(RS5C_REG_CTRL1);
        buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
@@ -546,6 +555,7 @@ static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
                buf[1] |= RS5C372_CTRL2_24;
                rs5c372->time24 = 1;
                break;
+       case rtc_r2025sd:
        case rtc_rv5c386:
        case rtc_rv5c387a:
                buf[0] |= RV5C387_CTRL1_24;
@@ -623,6 +633,7 @@ static int rs5c372_probe(struct i2c_client *client,
                if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
                        rs5c372->time24 = 1;
                break;
+       case rtc_r2025sd:
        case rtc_rv5c386:
        case rtc_rv5c387a:
                if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
@@ -638,6 +649,9 @@ static int rs5c372_probe(struct i2c_client *client,
 
        /* if the oscillator lost power and no other software (like
         * the bootloader) set it up, do it here.
+        *
+        * The R2025S/D does this a little differently than the other
+        * parts, so we special case that..
         */
        err = rs5c_oscillator_setup(rs5c372);
        if (unlikely(err < 0)) {
@@ -650,6 +664,7 @@ static int rs5c372_probe(struct i2c_client *client,
 
        dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
                        ({ char *s; switch (rs5c372->type) {
+                       case rtc_r2025sd:       s = "r2025sd"; break;
                        case rtc_rs5c372a:      s = "rs5c372a"; break;
                        case rtc_rs5c372b:      s = "rs5c372b"; break;
                        case rtc_rv5c386:       s = "rv5c386"; break;