1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
new file mode 100644
index 000000000000..1c18860f80d1
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2009 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "priv.h"
+
+int
+nv_rdaux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(port);
+	if (port->func->aux) {
+		int ret = i2c->acquire(port, 0);
+		if (ret == 0) {
+			ret = port->func->aux(port, true, 9, addr, data, size);
+			i2c->release(port);
+		}
+		return ret;
+	}
+	return -ENODEV;
+}
+
+int
+nv_wraux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(port);
+	if (port->func->aux) {
+		int ret = i2c->acquire(port, 0);
+		if (ret == 0) {
+			ret = port->func->aux(port, true, 8, addr, data, size);
+			i2c->release(port);
+		}
+		return ret;
+	}
+	return -ENODEV;
+}
+
+static int
+aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+	struct nvkm_i2c_port *port = adap->algo_data;
+	struct nvkm_i2c *i2c = nvkm_i2c(port);
+	struct i2c_msg *msg = msgs;
+	int ret, mcnt = num;
+
+	if (!port->func->aux)
+		return -ENODEV;
+
+	ret = i2c->acquire(port, 0);
+	if (ret)
+		return ret;
+
+	while (mcnt--) {
+		u8 remaining = msg->len;
+		u8 *ptr = msg->buf;
+
+		while (remaining) {
+			u8 cnt = (remaining > 16) ? 16 : remaining;
+			u8 cmd;
+
+			if (msg->flags & I2C_M_RD)
+				cmd = 1;
+			else
+				cmd = 0;
+
+			if (mcnt || remaining > 16)
+				cmd |= 4; /* MOT */
+
+			ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
+			if (ret < 0) {
+				i2c->release(port);
+				return ret;
+			}
+
+			ptr += cnt;
+			remaining -= cnt;
+		}
+
+		msg++;
+	}
+
+	i2c->release(port);
+	return num;
+}
+
+static u32
+aux_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+const struct i2c_algorithm nvkm_i2c_aux_algo = {
+	.master_xfer = aux_xfer,
+	.functionality = aux_func
+};