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OpenCloudOS-Kernel/drivers/media/spi/cxd2880-spi.c

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// SPDX-License-Identifier: GPL-2.0
/*
* cxd2880-spi.c
* Sony CXD2880 DVB-T2/T tuner + demodulator driver
* SPI adapter
*
* Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/ktime.h>
#include <media/dvb_demux.h>
#include <media/dmxdev.h>
#include <media/dvb_frontend.h>
#include "cxd2880.h"
#define CXD2880_MAX_FILTER_SIZE 32
#define BURST_WRITE_MAX 128
#define MAX_TRANS_PKT 300
struct cxd2880_ts_buf_info {
u8 read_ready:1;
u8 almost_full:1;
u8 almost_empty:1;
u8 overflow:1;
u8 underflow:1;
u16 pkt_num;
};
struct cxd2880_pid_config {
u8 is_enable;
u16 pid;
};
struct cxd2880_pid_filter_config {
u8 is_negative;
struct cxd2880_pid_config pid_config[CXD2880_MAX_FILTER_SIZE];
};
struct cxd2880_dvb_spi {
struct dvb_frontend dvb_fe;
struct dvb_adapter adapter;
struct dvb_demux demux;
struct dmxdev dmxdev;
struct dmx_frontend dmx_fe;
struct task_struct *cxd2880_ts_read_thread;
struct spi_device *spi;
struct mutex spi_mutex; /* For SPI access exclusive control */
int feed_count;
int all_pid_feed_count;
struct regulator *vcc_supply;
u8 *ts_buf;
struct cxd2880_pid_filter_config filter_config;
};
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
static int cxd2880_write_spi(struct spi_device *spi, u8 *data, u32 size)
{
struct spi_message msg;
struct spi_transfer tx = {};
if (!spi || !data) {
pr_err("invalid arg\n");
return -EINVAL;
}
tx.tx_buf = data;
tx.len = size;
spi_message_init(&msg);
spi_message_add_tail(&tx, &msg);
return spi_sync(spi, &msg);
}
static int cxd2880_write_reg(struct spi_device *spi,
u8 sub_address, const u8 *data, u32 size)
{
u8 send_data[BURST_WRITE_MAX + 4];
const u8 *write_data_top = NULL;
int ret = 0;
if (!spi || !data) {
pr_err("invalid arg\n");
return -EINVAL;
}
if (size > BURST_WRITE_MAX || size > U8_MAX) {
pr_err("data size > WRITE_MAX\n");
return -EINVAL;
}
if (sub_address + size > 0x100) {
pr_err("out of range\n");
return -EINVAL;
}
send_data[0] = 0x0e;
write_data_top = data;
send_data[1] = sub_address;
send_data[2] = (u8)size;
memcpy(&send_data[3], write_data_top, send_data[2]);
ret = cxd2880_write_spi(spi, send_data, send_data[2] + 3);
if (ret)
pr_err("write spi failed %d\n", ret);
return ret;
}
static int cxd2880_spi_read_ts(struct spi_device *spi,
u8 *read_data,
u32 packet_num)
{
int ret;
u8 data[3];
struct spi_message message;
struct spi_transfer transfer[2] = {};
if (!spi || !read_data || !packet_num) {
pr_err("invalid arg\n");
return -EINVAL;
}
if (packet_num > 0xffff) {
pr_err("packet num > 0xffff\n");
return -EINVAL;
}
data[0] = 0x10;
data[1] = packet_num >> 8;
data[2] = packet_num;
spi_message_init(&message);
transfer[0].len = 3;
transfer[0].tx_buf = data;
spi_message_add_tail(&transfer[0], &message);
transfer[1].len = packet_num * 188;
transfer[1].rx_buf = read_data;
spi_message_add_tail(&transfer[1], &message);
ret = spi_sync(spi, &message);
if (ret)
pr_err("spi_sync failed\n");
return ret;
}
static int cxd2880_spi_read_ts_buffer_info(struct spi_device *spi,
struct cxd2880_ts_buf_info *info)
{
u8 send_data = 0x20;
u8 recv_data[2];
int ret;
if (!spi || !info) {
pr_err("invalid arg\n");
return -EINVAL;
}
ret = spi_write_then_read(spi, &send_data, 1,
recv_data, sizeof(recv_data));
if (ret)
pr_err("spi_write_then_read failed\n");
info->read_ready = (recv_data[0] & 0x80) ? 1 : 0;
info->almost_full = (recv_data[0] & 0x40) ? 1 : 0;
info->almost_empty = (recv_data[0] & 0x20) ? 1 : 0;
info->overflow = (recv_data[0] & 0x10) ? 1 : 0;
info->underflow = (recv_data[0] & 0x08) ? 1 : 0;
info->pkt_num = ((recv_data[0] & 0x07) << 8) | recv_data[1];
return ret;
}
static int cxd2880_spi_clear_ts_buffer(struct spi_device *spi)
{
u8 data = 0x03;
int ret;
ret = cxd2880_write_spi(spi, &data, 1);
if (ret)
pr_err("write spi failed\n");
return ret;
}
static int cxd2880_set_pid_filter(struct spi_device *spi,
struct cxd2880_pid_filter_config *cfg)
{
u8 data[65];
int i;
u16 pid = 0;
int ret;
if (!spi) {
pr_err("invalid arg\n");
return -EINVAL;
}
data[0] = 0x00;
ret = cxd2880_write_reg(spi, 0x00, &data[0], 1);
if (ret)
return ret;
if (!cfg) {
data[0] = 0x02;
ret = cxd2880_write_reg(spi, 0x50, &data[0], 1);
} else {
data[0] = cfg->is_negative ? 0x01 : 0x00;
for (i = 0; i < CXD2880_MAX_FILTER_SIZE; i++) {
pid = cfg->pid_config[i].pid;
if (cfg->pid_config[i].is_enable) {
data[1 + (i * 2)] = (pid >> 8) | 0x20;
data[2 + (i * 2)] = pid & 0xff;
} else {
data[1 + (i * 2)] = 0x00;
data[2 + (i * 2)] = 0x00;
}
}
ret = cxd2880_write_reg(spi, 0x50, data, 65);
}
return ret;
}
static int cxd2880_update_pid_filter(struct cxd2880_dvb_spi *dvb_spi,
struct cxd2880_pid_filter_config *cfg,
bool is_all_pid_filter)
{
int ret;
if (!dvb_spi || !cfg) {
pr_err("invalid arg.\n");
return -EINVAL;
}
mutex_lock(&dvb_spi->spi_mutex);
if (is_all_pid_filter) {
struct cxd2880_pid_filter_config tmpcfg;
memset(&tmpcfg, 0, sizeof(tmpcfg));
tmpcfg.is_negative = 1;
tmpcfg.pid_config[0].is_enable = 1;
tmpcfg.pid_config[0].pid = 0x1fff;
ret = cxd2880_set_pid_filter(dvb_spi->spi, &tmpcfg);
} else {
ret = cxd2880_set_pid_filter(dvb_spi->spi, cfg);
}
mutex_unlock(&dvb_spi->spi_mutex);
if (ret)
pr_err("set_pid_filter failed\n");
return ret;
}
static int cxd2880_ts_read(void *arg)
{
struct cxd2880_dvb_spi *dvb_spi = NULL;
struct cxd2880_ts_buf_info info;
ktime_t start;
u32 i;
int ret;
dvb_spi = arg;
if (!dvb_spi) {
pr_err("invalid arg\n");
return -EINVAL;
}
ret = cxd2880_spi_clear_ts_buffer(dvb_spi->spi);
if (ret) {
pr_err("set_clear_ts_buffer failed\n");
return ret;
}
start = ktime_get();
while (!kthread_should_stop()) {
ret = cxd2880_spi_read_ts_buffer_info(dvb_spi->spi,
&info);
if (ret) {
pr_err("spi_read_ts_buffer_info error\n");
return ret;
}
if (info.pkt_num > MAX_TRANS_PKT) {
for (i = 0; i < info.pkt_num / MAX_TRANS_PKT; i++) {
cxd2880_spi_read_ts(dvb_spi->spi,
dvb_spi->ts_buf,
MAX_TRANS_PKT);
dvb_dmx_swfilter(&dvb_spi->demux,
dvb_spi->ts_buf,
MAX_TRANS_PKT * 188);
}
start = ktime_get();
} else if ((info.pkt_num > 0) &&
(ktime_to_ms(ktime_sub(ktime_get(), start)) >= 500)) {
cxd2880_spi_read_ts(dvb_spi->spi,
dvb_spi->ts_buf,
info.pkt_num);
dvb_dmx_swfilter(&dvb_spi->demux,
dvb_spi->ts_buf,
info.pkt_num * 188);
start = ktime_get();
} else {
usleep_range(10000, 11000);
}
}
return 0;
}
static int cxd2880_start_feed(struct dvb_demux_feed *feed)
{
int ret = 0;
int i = 0;
struct dvb_demux *demux = NULL;
struct cxd2880_dvb_spi *dvb_spi = NULL;
if (!feed) {
pr_err("invalid arg\n");
return -EINVAL;
}
demux = feed->demux;
if (!demux) {
pr_err("feed->demux is NULL\n");
return -EINVAL;
}
dvb_spi = demux->priv;
if (dvb_spi->feed_count == CXD2880_MAX_FILTER_SIZE) {
pr_err("Exceeded maximum PID count (32).");
pr_err("Selected PID cannot be enabled.\n");
return -EINVAL;
}
if (feed->pid == 0x2000) {
if (dvb_spi->all_pid_feed_count == 0) {
ret = cxd2880_update_pid_filter(dvb_spi,
&dvb_spi->filter_config,
true);
if (ret) {
pr_err("update pid filter failed\n");
return ret;
}
}
dvb_spi->all_pid_feed_count++;
pr_debug("all PID feed (count = %d)\n",
dvb_spi->all_pid_feed_count);
} else {
struct cxd2880_pid_filter_config cfgtmp;
cfgtmp = dvb_spi->filter_config;
for (i = 0; i < CXD2880_MAX_FILTER_SIZE; i++) {
if (cfgtmp.pid_config[i].is_enable == 0) {
cfgtmp.pid_config[i].is_enable = 1;
cfgtmp.pid_config[i].pid = feed->pid;
pr_debug("store PID %d to #%d\n",
feed->pid, i);
break;
}
}
if (i == CXD2880_MAX_FILTER_SIZE) {
pr_err("PID filter is full.\n");
return -EINVAL;
}
if (!dvb_spi->all_pid_feed_count)
ret = cxd2880_update_pid_filter(dvb_spi,
&cfgtmp,
false);
if (ret)
return ret;
dvb_spi->filter_config = cfgtmp;
}
if (dvb_spi->feed_count == 0) {
dvb_spi->ts_buf =
kmalloc(MAX_TRANS_PKT * 188,
GFP_KERNEL | GFP_DMA);
if (!dvb_spi->ts_buf) {
pr_err("ts buffer allocate failed\n");
memset(&dvb_spi->filter_config, 0,
sizeof(dvb_spi->filter_config));
dvb_spi->all_pid_feed_count = 0;
return -ENOMEM;
}
dvb_spi->cxd2880_ts_read_thread = kthread_run(cxd2880_ts_read,
dvb_spi,
"cxd2880_ts_read");
if (IS_ERR(dvb_spi->cxd2880_ts_read_thread)) {
pr_err("kthread_run failed\n");
kfree(dvb_spi->ts_buf);
dvb_spi->ts_buf = NULL;
memset(&dvb_spi->filter_config, 0,
sizeof(dvb_spi->filter_config));
dvb_spi->all_pid_feed_count = 0;
return PTR_ERR(dvb_spi->cxd2880_ts_read_thread);
}
}
dvb_spi->feed_count++;
pr_debug("start feed (count %d)\n", dvb_spi->feed_count);
return 0;
}
static int cxd2880_stop_feed(struct dvb_demux_feed *feed)
{
int i = 0;
int ret;
struct dvb_demux *demux = NULL;
struct cxd2880_dvb_spi *dvb_spi = NULL;
if (!feed) {
pr_err("invalid arg\n");
return -EINVAL;
}
demux = feed->demux;
if (!demux) {
pr_err("feed->demux is NULL\n");
return -EINVAL;
}
dvb_spi = demux->priv;
if (!dvb_spi->feed_count) {
pr_err("no feed is started\n");
return -EINVAL;
}
if (feed->pid == 0x2000) {
/*
* Special PID case.
* Number of 0x2000 feed request was stored
* in dvb_spi->all_pid_feed_count.
*/
if (dvb_spi->all_pid_feed_count <= 0) {
pr_err("PID %d not found\n", feed->pid);
return -EINVAL;
}
dvb_spi->all_pid_feed_count--;
} else {
struct cxd2880_pid_filter_config cfgtmp;
cfgtmp = dvb_spi->filter_config;
for (i = 0; i < CXD2880_MAX_FILTER_SIZE; i++) {
if (feed->pid == cfgtmp.pid_config[i].pid &&
cfgtmp.pid_config[i].is_enable != 0) {
cfgtmp.pid_config[i].is_enable = 0;
cfgtmp.pid_config[i].pid = 0;
pr_debug("removed PID %d from #%d\n",
feed->pid, i);
break;
}
}
dvb_spi->filter_config = cfgtmp;
if (i == CXD2880_MAX_FILTER_SIZE) {
pr_err("PID %d not found\n", feed->pid);
return -EINVAL;
}
}
ret = cxd2880_update_pid_filter(dvb_spi,
&dvb_spi->filter_config,
dvb_spi->all_pid_feed_count > 0);
dvb_spi->feed_count--;
if (dvb_spi->feed_count == 0) {
int ret_stop = 0;
ret_stop = kthread_stop(dvb_spi->cxd2880_ts_read_thread);
if (ret_stop) {
pr_err("kthread_stop failed. (%d)\n", ret_stop);
ret = ret_stop;
}
kfree(dvb_spi->ts_buf);
dvb_spi->ts_buf = NULL;
}
pr_debug("stop feed ok.(count %d)\n", dvb_spi->feed_count);
return ret;
}
static const struct of_device_id cxd2880_spi_of_match[] = {
{ .compatible = "sony,cxd2880" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, cxd2880_spi_of_match);
static int
cxd2880_spi_probe(struct spi_device *spi)
{
int ret;
struct cxd2880_dvb_spi *dvb_spi = NULL;
struct cxd2880_config config;
if (!spi) {
pr_err("invalid arg\n");
return -EINVAL;
}
dvb_spi = kzalloc(sizeof(struct cxd2880_dvb_spi), GFP_KERNEL);
if (!dvb_spi)
return -ENOMEM;
dvb_spi->vcc_supply = devm_regulator_get_optional(&spi->dev, "vcc");
if (IS_ERR(dvb_spi->vcc_supply)) {
if (PTR_ERR(dvb_spi->vcc_supply) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto fail_regulator;
}
dvb_spi->vcc_supply = NULL;
} else {
ret = regulator_enable(dvb_spi->vcc_supply);
if (ret)
goto fail_regulator;
}
dvb_spi->spi = spi;
mutex_init(&dvb_spi->spi_mutex);
spi_set_drvdata(spi, dvb_spi);
config.spi = spi;
config.spi_mutex = &dvb_spi->spi_mutex;
ret = dvb_register_adapter(&dvb_spi->adapter,
"CXD2880",
THIS_MODULE,
&spi->dev,
adapter_nr);
if (ret < 0) {
pr_err("dvb_register_adapter() failed\n");
goto fail_adapter;
}
if (!dvb_attach(cxd2880_attach, &dvb_spi->dvb_fe, &config)) {
pr_err("cxd2880_attach failed\n");
ret = -ENODEV;
goto fail_attach;
}
ret = dvb_register_frontend(&dvb_spi->adapter,
&dvb_spi->dvb_fe);
if (ret < 0) {
pr_err("dvb_register_frontend() failed\n");
goto fail_frontend;
}
dvb_spi->demux.dmx.capabilities = DMX_TS_FILTERING;
dvb_spi->demux.priv = dvb_spi;
dvb_spi->demux.filternum = CXD2880_MAX_FILTER_SIZE;
dvb_spi->demux.feednum = CXD2880_MAX_FILTER_SIZE;
dvb_spi->demux.start_feed = cxd2880_start_feed;
dvb_spi->demux.stop_feed = cxd2880_stop_feed;
ret = dvb_dmx_init(&dvb_spi->demux);
if (ret < 0) {
pr_err("dvb_dmx_init() failed\n");
goto fail_dmx;
}
dvb_spi->dmxdev.filternum = CXD2880_MAX_FILTER_SIZE;
dvb_spi->dmxdev.demux = &dvb_spi->demux.dmx;
dvb_spi->dmxdev.capabilities = 0;
ret = dvb_dmxdev_init(&dvb_spi->dmxdev,
&dvb_spi->adapter);
if (ret < 0) {
pr_err("dvb_dmxdev_init() failed\n");
goto fail_dmxdev;
}
dvb_spi->dmx_fe.source = DMX_FRONTEND_0;
ret = dvb_spi->demux.dmx.add_frontend(&dvb_spi->demux.dmx,
&dvb_spi->dmx_fe);
if (ret < 0) {
pr_err("add_frontend() failed\n");
goto fail_dmx_fe;
}
ret = dvb_spi->demux.dmx.connect_frontend(&dvb_spi->demux.dmx,
&dvb_spi->dmx_fe);
if (ret < 0) {
pr_err("connect_frontend() failed\n");
goto fail_fe_conn;
}
pr_info("Sony CXD2880 has successfully attached.\n");
return 0;
fail_fe_conn:
dvb_spi->demux.dmx.remove_frontend(&dvb_spi->demux.dmx,
&dvb_spi->dmx_fe);
fail_dmx_fe:
dvb_dmxdev_release(&dvb_spi->dmxdev);
fail_dmxdev:
dvb_dmx_release(&dvb_spi->demux);
fail_dmx:
dvb_unregister_frontend(&dvb_spi->dvb_fe);
fail_frontend:
dvb_frontend_detach(&dvb_spi->dvb_fe);
fail_attach:
dvb_unregister_adapter(&dvb_spi->adapter);
fail_adapter:
if (dvb_spi->vcc_supply)
regulator_disable(dvb_spi->vcc_supply);
fail_regulator:
kfree(dvb_spi);
return ret;
}
static int
cxd2880_spi_remove(struct spi_device *spi)
{
struct cxd2880_dvb_spi *dvb_spi = spi_get_drvdata(spi);
dvb_spi->demux.dmx.remove_frontend(&dvb_spi->demux.dmx,
&dvb_spi->dmx_fe);
dvb_dmxdev_release(&dvb_spi->dmxdev);
dvb_dmx_release(&dvb_spi->demux);
dvb_unregister_frontend(&dvb_spi->dvb_fe);
dvb_frontend_detach(&dvb_spi->dvb_fe);
dvb_unregister_adapter(&dvb_spi->adapter);
if (dvb_spi->vcc_supply)
regulator_disable(dvb_spi->vcc_supply);
kfree(dvb_spi);
pr_info("cxd2880_spi remove ok.\n");
return 0;
}
static const struct spi_device_id cxd2880_spi_id[] = {
{ "cxd2880", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, cxd2880_spi_id);
static struct spi_driver cxd2880_spi_driver = {
.driver = {
.name = "cxd2880",
.of_match_table = cxd2880_spi_of_match,
},
.id_table = cxd2880_spi_id,
.probe = cxd2880_spi_probe,
.remove = cxd2880_spi_remove,
};
module_spi_driver(cxd2880_spi_driver);
MODULE_DESCRIPTION("Sony CXD2880 DVB-T2/T tuner + demod driver SPI adapter");
MODULE_AUTHOR("Sony Semiconductor Solutions Corporation");
MODULE_LICENSE("GPL v2");
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