+static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
+{
+ unsigned char buf[2];
+ int addr, i, ret = 0;
+
+ 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];
+ buf[1] = rs5c372->regs[RS5C_REG_CTRL2];
+
+ /* use 24hr mode */
+ switch (rs5c372->type) {
+ case rtc_rs5c372a:
+ case rtc_rs5c372b:
+ buf[1] |= RS5C372_CTRL2_24;
+ rs5c372->time24 = 1;
+ break;
+ case rtc_r2025sd:
+ case rtc_rv5c386:
+ case rtc_rv5c387a:
+ buf[0] |= RV5C387_CTRL1_24;
+ rs5c372->time24 = 1;
+ break;
+ default:
+ /* impossible */
+ break;
+ }
+
+ for (i = 0; i < sizeof(buf); i++) {
+ addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
+ ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
+ if (unlikely(ret < 0))
+ return ret;
+ }
+
+ rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
+ rs5c372->regs[RS5C_REG_CTRL2] = buf[1];
+
+ return 0;
+}
+
+static int rs5c372_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)