1 files changed, 114 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..02eb42be2e9e
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
@@ -0,0 +1,114 @@
+/*
+ * 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 nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
+{
+        struct nouveau_i2c *i2c = nouveau_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 nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
+{
+        struct nouveau_i2c *i2c = nouveau_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 nouveau_i2c_port *port = adap->algo_data;
+        struct nouveau_i2c *i2c = nouveau_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 nouveau_i2c_aux_algo = {
+        .master_xfer = aux_xfer,
+        .functionality = aux_func
+};