summaryrefslogtreecommitdiffstats
path: root/src/vlib/i2c.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/vlib/i2c.c')
-rw-r--r--src/vlib/i2c.c231
1 files changed, 0 insertions, 231 deletions
diff --git a/src/vlib/i2c.c b/src/vlib/i2c.c
deleted file mode 100644
index 97f5bb21cc7..00000000000
--- a/src/vlib/i2c.c
+++ /dev/null
@@ -1,231 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <vlib/vlib.h>
-#include <vlib/i2c.h>
-
-static inline void
-i2c_delay (i2c_bus_t * b, f64 timeout)
-{
- vlib_main_t *vm = vlib_get_main ();
- vlib_time_wait (vm, timeout);
-}
-
-static void
-i2c_wait_for_scl (i2c_bus_t * b)
-{
- f64 t = 0;
-
- while (t < b->hold_time)
- {
- int sda, scl;
- i2c_delay (b, b->rise_fall_time);
- b->get_bits (b, &scl, &sda);
-
- if (scl)
- return;
-
- t += b->rise_fall_time;
- }
- b->timeout = 1;
-}
-
-static void
-i2c_start (i2c_bus_t * b)
-{
- b->timeout = 0;
-
- b->put_bits (b, 1, 1);
- i2c_wait_for_scl (b);
-
- if (vlib_i2c_bus_timed_out (b))
- return;
-
- b->put_bits (b, 1, 0);
- i2c_delay (b, b->hold_time);
- b->put_bits (b, 0, 0);
- i2c_delay (b, b->hold_time);
-}
-
-static void
-i2c_stop (i2c_bus_t * b)
-{
- b->put_bits (b, 0, 0);
- i2c_delay (b, b->rise_fall_time);
-
- b->put_bits (b, 1, 0);
- i2c_delay (b, b->hold_time);
-
- b->put_bits (b, 1, 1);
- i2c_delay (b, b->hold_time);
-}
-
-static void
-i2c_write_bit (i2c_bus_t * b, int sda)
-{
- b->put_bits (b, 0, sda);
- i2c_delay (b, b->rise_fall_time);
-
- b->put_bits (b, 1, sda);
- i2c_wait_for_scl (b);
- i2c_delay (b, b->hold_time);
-
- b->put_bits (b, 0, sda);
- i2c_delay (b, b->rise_fall_time);
-}
-
-static void
-i2c_read_bit (i2c_bus_t * b, int *sda)
-{
- int scl;
-
- b->put_bits (b, 1, 1);
- i2c_wait_for_scl (b);
- i2c_delay (b, b->hold_time);
-
- b->get_bits (b, &scl, sda);
-
- b->put_bits (b, 0, 1);
- i2c_delay (b, b->rise_fall_time);
-}
-
-static void
-i2c_write_byte (i2c_bus_t * b, u8 data)
-{
- int i, sda;
-
- for (i = 7; i >= 0; i--)
- {
- i2c_write_bit (b, (data >> i) & 1);
- if (b->timeout)
- return;
- }
-
- b->put_bits (b, 0, 1);
- i2c_delay (b, b->rise_fall_time);
-
- i2c_read_bit (b, &sda);
-
- if (sda)
- b->timeout = 1;
-}
-
-
-static void
-i2c_read_byte (i2c_bus_t * b, u8 * data, int ack)
-{
- int i, sda;
-
- *data = 0;
-
- b->put_bits (b, 0, 1);
- i2c_delay (b, b->rise_fall_time);
-
- for (i = 7; i >= 0; i--)
- {
- i2c_read_bit (b, &sda);
- if (b->timeout)
- return;
-
- *data |= (sda != 0) << i;
- }
-
- i2c_write_bit (b, ack == 0);
-}
-
-
-void
-vlib_i2c_init (i2c_bus_t * b)
-{
- f64 tick;
- if (!b->clock)
- b->clock = 400000;
-
- tick = 1.0 / b->clock;
-
- /* Spend 40% of time in low and high states */
- if (!b->hold_time)
- b->hold_time = 0.4 * tick;
-
- /* Spend 10% of time waiting for rise and fall */
- if (!b->rise_fall_time)
- b->rise_fall_time = 0.1 * tick;
-}
-
-void
-vlib_i2c_xfer (i2c_bus_t * bus, i2c_msg_t * msgs)
-{
- i2c_msg_t *msg;
- int i;
-
- vec_foreach (msg, msgs)
- {
- i2c_start (bus);
- i2c_write_byte (bus,
- (msg->addr << 1) + (msg->flags == I2C_MSG_FLAG_READ));
-
- if (msg->flags & I2C_MSG_FLAG_READ)
- for (i = 0; i < msg->len; i++)
- {
- i2c_read_byte (bus, &msg->buffer[i], /* ack */ i + 1 != msg->len);
- if (bus->timeout)
- goto done;
- }
-
- else
- for (i = 0; i < msg->len; i++)
- {
- i2c_write_byte (bus, msg->buffer[i]);
- if (bus->timeout)
- goto done;
- }
- }
-
-done:
- i2c_stop (bus);
-}
-
-void
-vlib_i2c_read_eeprom (i2c_bus_t * bus, u8 i2c_addr, u16 start_addr,
- u16 length, u8 * data)
-{
- i2c_msg_t *msg = 0;
- u8 start_address[1];
-
- vec_validate (msg, 1);
-
- start_address[0] = start_addr;
- msg[0].addr = i2c_addr;
- msg[0].flags = I2C_MSG_FLAG_WRITE;
- msg[0].buffer = (u8 *) & start_address;
- msg[0].len = 1;
-
- msg[1].addr = i2c_addr;
- msg[1].flags = I2C_MSG_FLAG_READ;
- msg[1].buffer = data;
- msg[1].len = length;
-
- vlib_i2c_xfer (bus, msg);
-
- vec_free (msg);
-}
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */