- 根目录:
- drivers
- gpu
- drm
- i2c
- sil164_drv.c
/*
* Copyright (C) 2010 Francisco Jerez.
* All Rights Reserved.
*
* 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 (including the
* next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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.
*
*/
#include <linux/module.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_encoder_slave.h>
#include <drm/i2c/sil164.h>
struct sil164_priv {
struct sil164_encoder_params config;
struct i2c_client *duallink_slave;
uint8_t saved_state[0x10];
uint8_t saved_slave_state[0x10];
};
#define to_sil164_priv(x) \
((struct sil164_priv *)to_encoder_slave(x)->slave_priv)
#define sil164_dbg(client, format, ...) do { \
if (drm_debug & DRM_UT_KMS) \
dev_printk(KERN_DEBUG, &client->dev, \
"%s: " format, __func__, ## __VA_ARGS__); \
} while (0)
#define sil164_info(client, format, ...) \
dev_info(&client->dev, format, __VA_ARGS__)
#define sil164_err(client, format, ...) \
dev_err(&client->dev, format, __VA_ARGS__)
#define SIL164_I2C_ADDR_MASTER 0x38
#define SIL164_I2C_ADDR_SLAVE 0x39
/* HW register definitions */
#define SIL164_VENDOR_LO 0x0
#define SIL164_VENDOR_HI 0x1
#define SIL164_DEVICE_LO 0x2
#define SIL164_DEVICE_HI 0x3
#define SIL164_REVISION 0x4
#define SIL164_FREQ_MIN 0x6
#define SIL164_FREQ_MAX 0x7
#define SIL164_CONTROL0 0x8
# define SIL164_CONTROL0_POWER_ON 0x01
# define SIL164_CONTROL0_EDGE_RISING 0x02
# define SIL164_CONTROL0_INPUT_24BIT 0x04
# define SIL164_CONTROL0_DUAL_EDGE 0x08
# define SIL164_CONTROL0_HSYNC_ON 0x10
# define SIL164_CONTROL0_VSYNC_ON 0x20
#define SIL164_DETECT 0x9
# define SIL164_DETECT_INTR_STAT 0x01
# define SIL164_DETECT_HOTPLUG_STAT 0x02
# define SIL164_DETECT_RECEIVER_STAT 0x04
# define SIL164_DETECT_INTR_MODE_RECEIVER 0x00
# define SIL164_DETECT_INTR_MODE_HOTPLUG 0x08
# define SIL164_DETECT_OUT_MODE_HIGH 0x00
# define SIL164_DETECT_OUT_MODE_INTR 0x10
# define SIL164_DETECT_OUT_MODE_RECEIVER 0x20
# define SIL164_DETECT_OUT_MODE_HOTPLUG 0x30
# define SIL164_DETECT_VSWING_STAT 0x80
#define SIL164_CONTROL1 0xa
# define SIL164_CONTROL1_DESKEW_ENABLE 0x10
# define SIL164_CONTROL1_DESKEW_INCR_SHIFT 5
#define SIL164_GPIO 0xb
#define SIL164_CONTROL2 0xc
# define SIL164_CONTROL2_FILTER_ENABLE 0x01
# define SIL164_CONTROL2_FILTER_SETTING_SHIFT 1
# define SIL164_CONTROL2_DUALLINK_MASTER 0x40
# define SIL164_CONTROL2_SYNC_CONT 0x80
#define SIL164_DUALLINK 0xd
# define SIL164_DUALLINK_ENABLE 0x10
# define SIL164_DUALLINK_SKEW_SHIFT 5
#define SIL164_PLLZONE 0xe
# define SIL164_PLLZONE_STAT 0x08
# define SIL164_PLLZONE_FORCE_ON 0x10
# define SIL164_PLLZONE_FORCE_HIGH 0x20
/* HW access functions */
static void
sil164_write(struct i2c_client *client, uint8_t addr, uint8_t val)
{
uint8_t buf[] = {addr, val};
int ret;
ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
if (ret < 0)
sil164_err(client, "Error %d writing to subaddress 0x%x\n",
ret, addr);
}
static uint8_t
sil164_read(struct i2c_client *client, uint8_t addr)
{
uint8_t val;
int ret;
ret = i2c_master_send(client, &addr, sizeof(addr));
if (ret < 0)
goto fail;
ret = i2c_master_recv(client, &val, sizeof(val));
if (ret < 0)
goto fail;
return val;
fail:
sil164_err(client, "Error %d reading from subaddress 0x%x\n",
ret, addr);
return 0;
}
static void
sil164_save_state(struct i2c_client *client, uint8_t *state)
{
int i;
for (i = 0x8; i <= 0xe; i++)
state[i] = sil164_read(client, i);
}
static void
sil164_restore_state(struct i2c_client *client, uint8_t *state)
{
int i;
for (i = 0x8; i <= 0xe; i++)
sil164_write(client, i, state[i]);
}
static void
sil164_set_power_state(struct i2c_client *client, bool on)
{
uint8_t control0 = sil164_read(client, SIL164_CONTROL0);
if (on)
control0 |= SIL164_CONTROL0_POWER_ON;
else
control0 &= ~SIL164_CONTROL0_POWER_ON;
sil164_write(client, SIL164_CONTROL0, control0);
}
static void
sil164_init_state(struct i2c_client *client,
struct sil164_encoder_params *config,
bool duallink)
{
sil164_write(client, SIL164_CONTROL0,
SIL164_CONTROL0_HSYNC_ON |
SIL164_CONTROL0_VSYNC_ON |
(config->input_edge ? SIL164_CONTROL0_EDGE_RISING : 0) |
(config->input_width ? SIL164_CONTROL0_INPUT_24BIT : 0) |
(config->input_dual ? SIL164_CONTROL0_DUAL_EDGE : 0));
sil164_write(client, SIL164_DETECT,
SIL164_DETECT_INTR_STAT |
SIL164_DETECT_OUT_MODE_RECEIVER);
sil164_write(client, SIL164_CONTROL1,
(config->input_skew ? SIL164_CONTROL1_DESKEW_ENABLE : 0) |
(((config->input_skew + 4) & 0x7)
<< SIL164_CONTROL1_DESKEW_INCR_SHIFT));
sil164_write(client, SIL164_CONTROL2,
SIL164_CONTROL2_SYNC_CONT |
(config->pll_filter ? 0 : SIL164_CONTROL2_FILTER_ENABLE) |
(4 << SIL164_CONTROL2_FILTER_SETTING_SHIFT));
sil164_write(client, SIL164_PLLZONE, 0);
if (duallink)
sil164_write(client, SIL164_DUALLINK,
SIL164_DUALLINK_ENABLE |
(((config->duallink_skew + 4) & 0x7)
<< SIL164_DUALLINK_SKEW_SHIFT));
else
sil164_write(client, SIL164_DUALLINK, 0);
}
/* DRM encoder functions */
static void
sil164_encoder_set_config(struct drm_encoder *encoder, void *params)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
priv->config = *(struct sil164_encoder_params *)params;
}
static void
sil164_encoder_dpms(struct drm_encoder *encoder, int mode)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
bool on = (mode == DRM_MODE_DPMS_ON);
bool duallink = (on && encoder->crtc->mode.clock > 165000);
sil164_set_power_state(drm_i2c_encoder_get_client(encoder), on);
if (priv->duallink_slave)
sil164_set_power_state(priv->duallink_slave, duallink);
}
static void
sil164_encoder_save(struct drm_encoder *encoder)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
sil164_save_state(drm_i2c_encoder_get_client(encoder),
priv->saved_state);
if (priv->duallink_slave)
sil164_save_state(priv->duallink_slave,
priv->saved_slave_state);
}
static void
sil164_encoder_restore(struct drm_encoder *encoder)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
sil164_restore_state(drm_i2c_encoder_get_client(encoder),
priv->saved_state);
if (priv->duallink_slave)
sil164_restore_state(priv->duallink_slave,
priv->saved_slave_state);
}
static bool
sil164_encoder_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
return true;
}
static int
sil164_encoder_mode_valid(struct drm_encoder *encoder,
struct drm_display_mode *mode)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
if (mode->clock < 32000)
return MODE_CLOCK_LOW;
if (mode->clock > 330000 ||
(mode->clock > 165000 && !priv->duallink_slave))
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static void
sil164_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
bool duallink = adjusted_mode->clock > 165000;
sil164_init_state(drm_i2c_encoder_get_client(encoder),
&priv->config, duallink);
if (priv->duallink_slave)
sil164_init_state(priv->duallink_slave,
&priv->config, duallink);
sil164_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}
static enum drm_connector_status
sil164_encoder_detect(struct drm_encoder *encoder,
struct drm_connector *connector)
{
struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
if (sil164_read(client, SIL164_DETECT) & SIL164_DETECT_HOTPLUG_STAT)
return connector_status_connected;
else
return connector_status_disconnected;
}
static int
sil164_encoder_get_modes(struct drm_encoder *encoder,
struct drm_connector *connector)
{
return 0;
}
static int
sil164_encoder_create_resources(struct drm_encoder *encoder,
struct drm_connector *connector)
{
return 0;
}
static int
sil164_encoder_set_property(struct drm_encoder *encoder,
struct drm_connector *connector,
struct drm_property *property,
uint64_t val)
{
return 0;
}
static void
sil164_encoder_destroy(struct drm_encoder *encoder)
{
struct sil164_priv *priv = to_sil164_priv(encoder);
if (priv->duallink_slave)
i2c_unregister_device(priv->duallink_slave);
kfree(priv);
drm_i2c_encoder_destroy(encoder);
}
static struct drm_encoder_slave_funcs sil164_encoder_funcs = {
.set_config = sil164_encoder_set_config,
.destroy = sil164_encoder_destroy,
.dpms = sil164_encoder_dpms,
.save = sil164_encoder_save,
.restore = sil164_encoder_restore,
.mode_fixup = sil164_encoder_mode_fixup,
.mode_valid = sil164_encoder_mode_valid,
.mode_set = sil164_encoder_mode_set,
.detect = sil164_encoder_detect,
.get_modes = sil164_encoder_get_modes,
.create_resources = sil164_encoder_create_resources,
.set_property = sil164_encoder_set_property,
};
/* I2C driver functions */
static int
sil164_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
int vendor = sil164_read(client, SIL164_VENDOR_HI) << 8 |
sil164_read(client, SIL164_VENDOR_LO);
int device = sil164_read(client, SIL164_DEVICE_HI) << 8 |
sil164_read(client, SIL164_DEVICE_LO);
int rev = sil164_read(client, SIL164_REVISION);
if (vendor != 0x1 || device != 0x6) {
sil164_dbg(client, "Unknown device %x:%x.%x\n",
vendor, device, rev);
return -ENODEV;
}
sil164_info(client, "Detected device %x:%x.%x\n",
vendor, device, rev);
return 0;
}
static int
sil164_remove(struct i2c_client *client)
{
return 0;
}
static struct i2c_client *
sil164_detect_slave(struct i2c_client *client)
{
struct i2c_adapter *adap = client->adapter;
struct i2c_msg msg = {
.addr = SIL164_I2C_ADDR_SLAVE,
.len = 0,
};
const struct i2c_board_info info = {
I2C_BOARD_INFO("sil164", SIL164_I2C_ADDR_SLAVE)
};
if (i2c_transfer(adap, &msg, 1) != 1) {
sil164_dbg(adap, "No dual-link slave found.");
return NULL;
}
return i2c_new_device(adap, &info);
}
static int
sil164_encoder_init(struct i2c_client *client,
struct drm_device *dev,
struct drm_encoder_slave *encoder)
{
struct sil164_priv *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
encoder->slave_priv = priv;
encoder->slave_funcs = &sil164_encoder_funcs;
priv->duallink_slave = sil164_detect_slave(client);
return 0;
}
static struct i2c_device_id sil164_ids[] = {
{ "sil164", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, sil164_ids);
static struct drm_i2c_encoder_driver sil164_driver = {
.i2c_driver = {
.probe = sil164_probe,
.remove = sil164_remove,
.driver = {
.name = "sil164",
},
.id_table = sil164_ids,
},
.encoder_init = sil164_encoder_init,
};
/* Module initialization */
static int __init
sil164_init(void)
{
return drm_i2c_encoder_register(THIS_MODULE, &sil164_driver);
}
static void __exit
sil164_exit(void)
{
drm_i2c_encoder_unregister(&sil164_driver);
}
MODULE_AUTHOR("Francisco Jerez <currojerez@riseup.net>");
MODULE_DESCRIPTION("Silicon Image sil164 TMDS transmitter driver");
MODULE_LICENSE("GPL and additional rights");
module_init(sil164_init);
module_exit(sil164_exit);