277 lines
6.5 KiB
C
277 lines
6.5 KiB
C
/*
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* Copyright © 2009 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/kobj.h>
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#include <sys/bus.h>
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#include <dev/iicbus/iic.h>
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#include "iicbus_if.h"
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#include <dev/iicbus/iiconf.h>
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#include <dev/drm2/drmP.h>
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#include <dev/drm2/drm_dp_helper.h>
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static int
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iic_dp_aux_transaction(device_t idev, int mode, uint8_t write_byte,
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uint8_t *read_byte)
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{
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struct iic_dp_aux_data *aux_data;
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int ret;
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aux_data = device_get_softc(idev);
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ret = (*aux_data->aux_ch)(idev, mode, write_byte, read_byte);
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return (ret);
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}
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/*
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* I2C over AUX CH
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*/
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/*
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* Send the address. If the I2C link is running, this 'restarts'
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* the connection with the new address, this is used for doing
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* a write followed by a read (as needed for DDC)
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*/
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static int
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iic_dp_aux_address(device_t idev, u16 address, bool reading)
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{
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struct iic_dp_aux_data *aux_data;
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int mode, ret;
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aux_data = device_get_softc(idev);
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mode = MODE_I2C_START;
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if (reading)
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mode |= MODE_I2C_READ;
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else
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mode |= MODE_I2C_WRITE;
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aux_data->address = address;
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aux_data->running = true;
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ret = iic_dp_aux_transaction(idev, mode, 0, NULL);
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return (ret);
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}
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/*
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* Stop the I2C transaction. This closes out the link, sending
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* a bare address packet with the MOT bit turned off
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*/
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static void
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iic_dp_aux_stop(device_t idev, bool reading)
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{
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struct iic_dp_aux_data *aux_data;
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int mode;
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aux_data = device_get_softc(idev);
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mode = MODE_I2C_STOP;
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if (reading)
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mode |= MODE_I2C_READ;
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else
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mode |= MODE_I2C_WRITE;
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if (aux_data->running) {
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(void)iic_dp_aux_transaction(idev, mode, 0, NULL);
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aux_data->running = false;
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}
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}
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/*
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* Write a single byte to the current I2C address, the
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* the I2C link must be running or this returns -EIO
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*/
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static int
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iic_dp_aux_put_byte(device_t idev, u8 byte)
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{
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struct iic_dp_aux_data *aux_data;
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int ret;
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aux_data = device_get_softc(idev);
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if (!aux_data->running)
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return (EIO);
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ret = iic_dp_aux_transaction(idev, MODE_I2C_WRITE, byte, NULL);
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return (ret);
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}
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/*
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* Read a single byte from the current I2C address, the
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* I2C link must be running or this returns -EIO
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*/
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static int
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iic_dp_aux_get_byte(device_t idev, u8 *byte_ret)
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{
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struct iic_dp_aux_data *aux_data;
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int ret;
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aux_data = device_get_softc(idev);
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if (!aux_data->running)
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return (EIO);
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ret = iic_dp_aux_transaction(idev, MODE_I2C_READ, 0, byte_ret);
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return (ret);
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}
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static int
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iic_dp_aux_xfer(device_t idev, struct iic_msg *msgs, uint32_t num)
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{
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u8 *buf;
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int b, m, ret;
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u16 len;
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bool reading;
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ret = 0;
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reading = false;
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for (m = 0; m < num; m++) {
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len = msgs[m].len;
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buf = msgs[m].buf;
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reading = (msgs[m].flags & IIC_M_RD) != 0;
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ret = iic_dp_aux_address(idev, msgs[m].slave >> 1, reading);
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if (ret != 0)
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break;
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if (reading) {
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for (b = 0; b < len; b++) {
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ret = iic_dp_aux_get_byte(idev, &buf[b]);
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if (ret != 0)
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break;
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}
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} else {
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for (b = 0; b < len; b++) {
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ret = iic_dp_aux_put_byte(idev, buf[b]);
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if (ret != 0)
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break;
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}
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}
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if (ret != 0)
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break;
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}
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iic_dp_aux_stop(idev, reading);
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DRM_DEBUG_KMS("dp_aux_xfer return %d\n", ret);
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return (ret);
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}
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static void
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iic_dp_aux_reset_bus(device_t idev)
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{
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(void)iic_dp_aux_address(idev, 0, false);
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(void)iic_dp_aux_stop(idev, false);
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}
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static int
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iic_dp_aux_reset(device_t idev, u_char speed, u_char addr, u_char *oldaddr)
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{
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iic_dp_aux_reset_bus(idev);
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return (0);
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}
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static int
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iic_dp_aux_prepare_bus(device_t idev)
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{
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/* adapter->retries = 3; */
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iic_dp_aux_reset_bus(idev);
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return (0);
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}
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static int
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iic_dp_aux_probe(device_t idev)
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{
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return (BUS_PROBE_DEFAULT);
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}
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static int
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iic_dp_aux_attach(device_t idev)
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{
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struct iic_dp_aux_data *aux_data;
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aux_data = device_get_softc(idev);
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aux_data->port = device_add_child(idev, "iicbus", -1);
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if (aux_data->port == NULL)
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return (ENXIO);
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device_quiet(aux_data->port);
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bus_generic_attach(idev);
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return (0);
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}
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int
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iic_dp_aux_add_bus(device_t dev, const char *name,
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int (*ch)(device_t idev, int mode, uint8_t write_byte, uint8_t *read_byte),
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void *priv, device_t *bus, device_t *adapter)
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{
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device_t ibus;
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struct iic_dp_aux_data *data;
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int idx, error;
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static int dp_bus_counter;
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mtx_lock(&Giant);
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idx = atomic_fetchadd_int(&dp_bus_counter, 1);
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ibus = device_add_child(dev, "drm_iic_dp_aux", idx);
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if (ibus == NULL) {
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mtx_unlock(&Giant);
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DRM_ERROR("drm_iic_dp_aux bus %d creation error\n", idx);
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return (-ENXIO);
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}
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device_quiet(ibus);
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error = device_probe_and_attach(ibus);
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if (error != 0) {
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device_delete_child(dev, ibus);
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mtx_unlock(&Giant);
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DRM_ERROR("drm_iic_dp_aux bus %d attach failed, %d\n",
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idx, error);
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return (-error);
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}
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data = device_get_softc(ibus);
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data->running = false;
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data->address = 0;
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data->aux_ch = ch;
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data->priv = priv;
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error = iic_dp_aux_prepare_bus(ibus);
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if (error == 0) {
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*bus = ibus;
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*adapter = data->port;
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}
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mtx_unlock(&Giant);
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return (error);
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}
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static device_method_t drm_iic_dp_aux_methods[] = {
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DEVMETHOD(device_probe, iic_dp_aux_probe),
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DEVMETHOD(device_attach, iic_dp_aux_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(iicbus_reset, iic_dp_aux_reset),
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DEVMETHOD(iicbus_transfer, iic_dp_aux_xfer),
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DEVMETHOD_END
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};
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static driver_t drm_iic_dp_aux_driver = {
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"drm_iic_dp_aux",
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drm_iic_dp_aux_methods,
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sizeof(struct iic_dp_aux_data)
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};
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static devclass_t drm_iic_dp_aux_devclass;
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DRIVER_MODULE_ORDERED(drm_iic_dp_aux, drmn, drm_iic_dp_aux_driver,
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drm_iic_dp_aux_devclass, 0, 0, SI_ORDER_SECOND);
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