add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/macintosh/via-cuda.c
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@@ -569,6 +569,7 @@
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     unsigned char ibuf[16];
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     int ibuf_len = 0;
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     int complete = 0;
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+    bool full;
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     spin_lock_irqsave(&cuda_lock, flags);
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@@ -656,12 +657,13 @@
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 	break;
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     case reading:
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-	if (reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)
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-	                  : ARRAY_FULL(cuda_rbuf, reply_ptr))
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+	full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)
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+	                     : ARRAY_FULL(cuda_rbuf, reply_ptr);
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+	if (full)
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 	    (void)in_8(&via[SR]);
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 	else
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 	    *reply_ptr++ = in_8(&via[SR]);
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-	if (!TREQ_asserted(status)) {
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+	if (!TREQ_asserted(status) || full) {
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 	    if (mcu_is_egret)
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 		assert_TACK();
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 	    /* that's all folks */
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@@ -766,3 +768,38 @@
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 	               buf, nb, false);
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     }
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 }
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+
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+/* Offset between Unix time (1970-based) and Mac time (1904-based) */
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+#define RTC_OFFSET	2082844800
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+
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+time64_t cuda_get_time(void)
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+{
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+	struct adb_request req;
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+	u32 now;
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+
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+	if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
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+		return 0;
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+	while (!req.complete)
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+		cuda_poll();
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+	if (req.reply_len != 7)
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+		pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
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+	now = (req.reply[3] << 24) + (req.reply[4] << 16) +
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+	      (req.reply[5] << 8) + req.reply[6];
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+	return (time64_t)now - RTC_OFFSET;
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+}
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+
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+int cuda_set_rtc_time(struct rtc_time *tm)
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+{
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+	u32 now;
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+	struct adb_request req;
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+
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+	now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
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+	if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
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+	                 now >> 24, now >> 16, now >> 8, now) < 0)
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+		return -ENXIO;
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+	while (!req.complete)
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+		cuda_poll();
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+	if ((req.reply_len != 3) && (req.reply_len != 7))
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+		pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
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+	return 0;
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+}