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    Subject[RFC PATCHv4 4/7] HSI: hsi_char: Add HSI char device driver
    Date
    From: Andras Domokos <andras.domokos@nokia.com>

    Add HSI char device driver to the kernel.

    Signed-off-by: Andras Domokos <andras.domokos@nokia.com>
    Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
    ---
    drivers/hsi/clients/hsi_char.c | 1094 ++++++++++++++++++++++++++++++++++++++++
    include/linux/hsi/hsi_char.h | 65 +++
    2 files changed, 1159 insertions(+), 0 deletions(-)
    create mode 100644 drivers/hsi/clients/hsi_char.c
    create mode 100644 include/linux/hsi/hsi_char.h

    diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c
    new file mode 100644
    index 0000000..19aeb24
    --- /dev/null
    +++ b/drivers/hsi/clients/hsi_char.c
    @@ -0,0 +1,1094 @@
    +/*
    + * hsi-char.c
    + *
    + * HSI character device driver, implements the character device
    + * interface.
    + *
    + * Copyright (C) 2010 Nokia Corporation. All rights reserved.
    + *
    + * Contact: Andras Domokos <andras.domokos@nokia.com>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * version 2 as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope that it will be useful, but
    + * WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    + * General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
    + * 02110-1301 USA
    + */
    +
    +#include <linux/errno.h>
    +#include <linux/types.h>
    +#include <asm/atomic.h>
    +#include <linux/kernel.h>
    +#include <linux/init.h>
    +#include <linux/module.h>
    +#include <linux/list.h>
    +#include <linux/slab.h>
    +#include <linux/poll.h>
    +#include <linux/ioctl.h>
    +#include <linux/wait.h>
    +#include <linux/fs.h>
    +#include <linux/sched.h>
    +#include <linux/device.h>
    +#include <linux/cdev.h>
    +#include <linux/uaccess.h>
    +#include <linux/scatterlist.h>
    +#include <linux/hsi/hsi.h>
    +#include <linux/hsi/hsi_char.h>
    +
    +#define HSI_CHAR_CHANNELS 8
    +#define HSI_CHAR_DEVS 8
    +#define HSI_CHAR_MSGS 4
    +
    +#define HSI_CHST_UNAVAIL 0 /* SBZ! */
    +#define HSI_CHST_AVAIL 1
    +
    +#define HSI_CHST_CLOSED (0 << 4)
    +#define HSI_CHST_CLOSING (1 << 4)
    +#define HSI_CHST_OPENING (2 << 4)
    +#define HSI_CHST_OPENED (3 << 4)
    +
    +#define HSI_CHST_READOFF (0 << 8)
    +#define HSI_CHST_READON (1 << 8)
    +#define HSI_CHST_READING (2 << 8)
    +
    +#define HSI_CHST_WRITEOFF (0 << 12)
    +#define HSI_CHST_WRITEON (1 << 12)
    +#define HSI_CHST_WRITING (2 << 12)
    +
    +#define HSI_CHST_OC_MASK 0xf0
    +#define HSI_CHST_RD_MASK 0xf00
    +#define HSI_CHST_WR_MASK 0xf000
    +
    +#define HSI_CHST_OC(c) ((c)->state & HSI_CHST_OC_MASK)
    +#define HSI_CHST_RD(c) ((c)->state & HSI_CHST_RD_MASK)
    +#define HSI_CHST_WR(c) ((c)->state & HSI_CHST_WR_MASK)
    +
    +#define HSI_CHST_OC_SET(c, v) \
    + do { \
    + (c)->state &= ~HSI_CHST_OC_MASK; \
    + (c)->state |= v; \
    + } while (0);
    +
    +#define HSI_CHST_RD_SET(c, v) \
    + do { \
    + (c)->state &= ~HSI_CHST_RD_MASK; \
    + (c)->state |= v; \
    + } while (0);
    +
    +#define HSI_CHST_WR_SET(c, v) \
    + do { \
    + (c)->state &= ~HSI_CHST_WR_MASK; \
    + (c)->state |= v; \
    + } while (0);
    +
    +#define HSI_CHAR_POLL_RST (-1)
    +#define HSI_CHAR_POLL_OFF 0
    +#define HSI_CHAR_POLL_ON 1
    +
    +#define HSI_CHAR_RX 0
    +#define HSI_CHAR_TX 1
    +
    +struct hsi_char_channel {
    + unsigned int ch;
    + unsigned int state;
    + int wlrefcnt;
    + int rxpoll;
    + struct hsi_client *cl;
    + struct list_head free_msgs_list;
    + struct list_head rx_msgs_queue;
    + struct list_head tx_msgs_queue;
    + int poll_event;
    + spinlock_t lock;
    + struct fasync_struct *async_queue;
    + wait_queue_head_t rx_wait;
    + wait_queue_head_t tx_wait;
    +};
    +
    +struct hsi_char_client_data {
    + atomic_t refcnt;
    + int attached;
    + atomic_t breq;
    + struct hsi_char_channel channels[HSI_CHAR_DEVS];
    +};
    +
    +static unsigned int max_data_size = 0x1000;
    +module_param(max_data_size, uint, 1);
    +MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)");
    +
    +static int channels_map[HSI_CHAR_DEVS] = {0, -1, -1 , -1, -1, -1, -1, -1};
    +module_param_array(channels_map, int, NULL, 0);
    +MODULE_PARM_DESC(channels_map, "Array of HSI channels ([0...7]) to be probed");
    +
    +static dev_t hsi_char_dev;
    +static struct hsi_char_client_data hsi_char_cl_data;
    +
    +static inline void hsi_char_msg_free(struct hsi_msg *msg)
    +{
    + msg->complete = NULL;
    + msg->destructor = NULL;
    + kfree(sg_virt(msg->sgt.sgl));
    + hsi_free_msg(msg);
    +}
    +
    +static inline void hsi_char_msgs_free(struct hsi_char_channel *channel)
    +{
    + struct hsi_msg *msg, *tmp;
    +
    + list_for_each_entry_safe(msg, tmp, &channel->free_msgs_list, link) {
    + list_del(&msg->link);
    + hsi_char_msg_free(msg);
    + }
    + list_for_each_entry_safe(msg, tmp, &channel->rx_msgs_queue, link) {
    + list_del(&msg->link);
    + hsi_char_msg_free(msg);
    + }
    + list_for_each_entry_safe(msg, tmp, &channel->tx_msgs_queue, link) {
    + list_del(&msg->link);
    + hsi_char_msg_free(msg);
    + }
    +}
    +
    +static inline struct hsi_msg *hsi_char_msg_alloc(unsigned int alloc_size)
    +{
    + struct hsi_msg *msg;
    + void *buf;
    +
    + msg = hsi_alloc_msg(1, GFP_KERNEL);
    + if (!msg)
    + goto out;
    + buf = kmalloc(alloc_size, GFP_KERNEL);
    + if (!buf) {
    + hsi_free_msg(msg);
    + goto out;
    + }
    + sg_init_one(msg->sgt.sgl, buf, alloc_size);
    + msg->context = buf;
    + return msg;
    +out:
    + return NULL;
    +}
    +
    +static inline int hsi_char_msgs_alloc(struct hsi_char_channel *channel)
    +{
    + struct hsi_msg *msg;
    + int i;
    +
    + for (i = 0; i < HSI_CHAR_MSGS; i++) {
    + msg = hsi_char_msg_alloc(max_data_size);
    + if (!msg)
    + goto out;
    + msg->channel = channel->ch;
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + }
    + return 0;
    +out:
    + hsi_char_msgs_free(channel);
    +
    + return -ENOMEM;
    +}
    +
    +static int _hsi_char_release(struct hsi_char_channel *channel, int remove)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(channel->cl);
    + int ret = 0, refcnt;
    +
    + spin_lock_bh(&channel->lock);
    + if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
    + goto out;
    + HSI_CHST_OC_SET(channel, HSI_CHST_CLOSING);
    + spin_unlock_bh(&channel->lock);
    +
    + while (channel->wlrefcnt > 0) {
    + hsi_stop_tx(channel->cl);
    + channel->wlrefcnt--;
    + }
    +
    + if (channel->rxpoll == HSI_CHAR_POLL_ON)
    + channel->poll_event |= POLLERR;
    +
    + wake_up_interruptible(&channel->rx_wait);
    + wake_up_interruptible(&channel->tx_wait);
    +
    + refcnt = atomic_dec_return(&cl_data->refcnt);
    + if (!refcnt) {
    + hsi_flush(channel->cl);
    + hsi_release_port(channel->cl);
    + cl_data->attached = 0;
    + }
    + hsi_char_msgs_free(channel);
    +
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
    + HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
    +out:
    + if (remove)
    + channel->cl = NULL;
    + spin_unlock_bh(&channel->lock);
    +
    + return ret;
    +}
    +
    +static int __devinit hsi_char_probe(struct device *dev)
    +{
    + struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
    + struct hsi_char_channel *channel = cl_data->channels;
    + struct hsi_client *cl = to_hsi_client(dev);
    + int i;
    +
    + for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
    + if (channel->state == HSI_CHST_AVAIL)
    + channel->cl = cl;
    + }
    + cl->hsi_start_rx = NULL;
    + cl->hsi_stop_rx = NULL;
    + atomic_set(&cl_data->refcnt, 0);
    + atomic_set(&cl_data->breq, 1);
    + cl_data->attached = 0;
    + hsi_client_set_drvdata(cl, cl_data);
    +
    + return 0;
    +}
    +
    +static int __devexit hsi_char_remove(struct device *dev)
    +{
    + struct hsi_client *cl = to_hsi_client(dev);
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
    + struct hsi_char_channel *channel = cl_data->channels;
    + int i;
    +
    + for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
    + if (!(channel->state & HSI_CHST_AVAIL))
    + continue;
    + _hsi_char_release(channel, 1);
    + }
    +
    + return 0;
    +}
    +
    +static inline unsigned int hsi_char_msg_len_get(struct hsi_msg *msg)
    +{
    + return msg->sgt.sgl->length;
    +}
    +
    +static inline void hsi_char_msg_len_set(struct hsi_msg *msg, unsigned int len)
    +{
    + msg->sgt.sgl->length = len;
    +}
    +
    +static void hsi_char_data_available(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + struct hsi_char_channel *channel = cl_data->channels + msg->channel;
    + int ret;
    +
    + if (msg->status == HSI_STATUS_ERROR) {
    + ret = hsi_async_read(channel->cl, msg);
    + if (ret < 0) {
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + channel->rxpoll = HSI_CHAR_POLL_OFF;
    + spin_unlock_bh(&channel->lock);
    + }
    + } else {
    + spin_lock_bh(&channel->lock);
    + channel->rxpoll = HSI_CHAR_POLL_OFF;
    + channel->poll_event |= (POLLIN | POLLRDNORM);
    + spin_unlock_bh(&channel->lock);
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + spin_unlock_bh(&channel->lock);
    + wake_up_interruptible(&channel->rx_wait);
    + }
    +}
    +
    +static void hsi_char_rx_completed(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + struct hsi_char_channel *channel = cl_data->channels + msg->channel;
    +
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->rx_msgs_queue);
    + spin_unlock_bh(&channel->lock);
    + wake_up_interruptible(&channel->rx_wait);
    +}
    +
    +static void hsi_char_rx_msg_destructor(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + struct hsi_char_channel *channel = cl_data->channels + msg->channel;
    +
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
    + spin_unlock_bh(&channel->lock);
    +}
    +
    +static void hsi_char_rx_poll_destructor(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + struct hsi_char_channel *channel = cl_data->channels + msg->channel;
    +
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + channel->rxpoll = HSI_CHAR_POLL_RST;
    + spin_unlock_bh(&channel->lock);
    +}
    +
    +static int hsi_char_rx_poll(struct hsi_char_channel *channel)
    +{
    + struct hsi_msg *msg;
    + int ret = 0;
    +
    + spin_lock_bh(&channel->lock);
    + if (list_empty(&channel->free_msgs_list)) {
    + ret = -ENOMEM;
    + goto out;
    + }
    + if (channel->rxpoll == HSI_CHAR_POLL_ON)
    + goto out;
    + msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
    + list_del(&msg->link);
    + channel->rxpoll = HSI_CHAR_POLL_ON;
    + spin_unlock_bh(&channel->lock);
    + hsi_char_msg_len_set(msg, 0);
    + msg->complete = hsi_char_data_available;
    + msg->destructor = hsi_char_rx_poll_destructor;
    + /* don't touch msg->context! */
    + ret = hsi_async_read(channel->cl, msg);
    + spin_lock_bh(&channel->lock);
    + if (ret < 0) {
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + channel->rxpoll = HSI_CHAR_POLL_OFF;
    + goto out;
    + }
    +out:
    + spin_unlock_bh(&channel->lock);
    +
    + return ret;
    +}
    +
    +static void hsi_char_tx_completed(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + struct hsi_char_channel *channel = cl_data->channels + msg->channel;
    +
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->tx_msgs_queue);
    + channel->poll_event |= (POLLOUT | POLLWRNORM);
    + spin_unlock_bh(&channel->lock);
    + wake_up_interruptible(&channel->tx_wait);
    +}
    +
    +static void hsi_char_tx_msg_destructor(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + struct hsi_char_channel *channel = cl_data->channels + msg->channel;
    +
    + spin_lock_bh(&channel->lock);
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
    + spin_unlock_bh(&channel->lock);
    +}
    +
    +static void hsi_char_rx_poll_rst(struct hsi_client *cl)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
    + struct hsi_char_channel *channel = cl_data->channels;
    + int i;
    +
    + for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
    + if ((HSI_CHST_OC(channel) == HSI_CHST_OPENED) &&
    + (channel->rxpoll == HSI_CHAR_POLL_RST))
    + hsi_char_rx_poll(channel);
    + }
    +}
    +
    +static void hsi_char_reset(struct hsi_client *cl)
    +{
    + hsi_flush(cl);
    + hsi_char_rx_poll_rst(cl);
    +}
    +
    +static void hsi_char_rx_cancel(struct hsi_char_channel *channel)
    +{
    + hsi_flush(channel->cl);
    + hsi_char_rx_poll_rst(channel->cl);
    +}
    +
    +static void hsi_char_tx_cancel(struct hsi_char_channel *channel)
    +{
    + hsi_flush(channel->cl);
    + hsi_char_rx_poll_rst(channel->cl);
    +}
    +
    +static void hsi_char_bcast_break(struct hsi_client *cl)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
    + struct hsi_char_channel *channel = cl_data->channels;
    + int i;
    +
    + for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
    + if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
    + continue;
    + channel->poll_event |= POLLPRI;
    + wake_up_interruptible(&channel->rx_wait);
    + wake_up_interruptible(&channel->tx_wait);
    + }
    +}
    +
    +static void hsi_char_break_received(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    + int ret;
    +
    + hsi_char_bcast_break(msg->cl);
    + ret = hsi_async_read(msg->cl, msg);
    + if (ret < 0) {
    + hsi_free_msg(msg);
    + atomic_inc(&cl_data->breq);
    + }
    +}
    +
    +static void hsi_char_break_req_destructor(struct hsi_msg *msg)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
    +
    + hsi_free_msg(msg);
    + atomic_inc(&cl_data->breq);
    +}
    +
    +static int hsi_char_break_request(struct hsi_client *cl)
    +{
    + struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
    + struct hsi_msg *msg;
    + int ret = 0;
    +
    + if (!atomic_dec_and_test(&cl_data->breq)) {
    + atomic_inc(&cl_data->breq);
    + return -EBUSY;
    + }
    + msg = hsi_alloc_msg(0, GFP_KERNEL);
    + if (!msg)
    + return -ENOMEM;
    + msg->break_frame = 1;
    + msg->complete = hsi_char_break_received;
    + msg->destructor = hsi_char_break_req_destructor;
    + ret = hsi_async_read(cl, msg);
    + if (ret < 0)
    + hsi_free_msg(msg);
    +
    + return ret;
    +}
    +
    +static int hsi_char_break_send(struct hsi_client *cl)
    +{
    + struct hsi_msg *msg;
    + int ret = 0;
    +
    + msg = hsi_alloc_msg(0, GFP_ATOMIC);
    + if (!msg)
    + return -ENOMEM;
    + msg->break_frame = 1;
    + msg->complete = hsi_free_msg;
    + msg->destructor = hsi_free_msg;
    + ret = hsi_async_write(cl, msg);
    + if (ret < 0)
    + hsi_free_msg(msg);
    +
    + return ret;
    +}
    +
    +static inline int ssi_check_common_cfg(struct hsi_config *cfg)
    +{
    + if ((cfg->mode != HSI_MODE_STREAM) && (cfg->mode != HSI_MODE_FRAME))
    + return -EINVAL;
    + if ((cfg->channels == 0) || (cfg->channels > HSI_CHAR_CHANNELS))
    + return -EINVAL;
    + if (cfg->channels & (cfg->channels - 1))
    + return -EINVAL;
    +
    + return 0;
    +}
    +
    +static inline int ssi_check_rx_cfg(struct hsi_config *cfg)
    +{
    + int ret;
    +
    + ret = ssi_check_common_cfg(cfg);
    + if (ret < 0)
    + return ret;
    + if ((cfg->flow != HSI_FLOW_SYNC) && (cfg->flow != HSI_FLOW_PIPE))
    + return -EINVAL;
    +
    + return 0;
    +}
    +
    +static inline int ssi_check_tx_cfg(struct hsi_config *cfg)
    +{
    + int ret;
    +
    + ret = ssi_check_common_cfg(cfg);
    + if (ret < 0)
    + return ret;
    + if ((cfg->arb_mode != HSI_ARB_RR) && (cfg->arb_mode != HSI_ARB_PRIO))
    + return -EINVAL;
    +
    + return 0;
    +}
    +
    +static inline int hsi_char_cfg_set(struct hsi_client *cl,
    + struct hsi_config *cfg, int dir)
    +{
    + struct hsi_config *rxtx_cfg;
    + int ret = 0;
    +
    + if (dir == HSI_CHAR_RX) {
    + rxtx_cfg = &cl->rx_cfg;
    + ret = ssi_check_rx_cfg(cfg);
    + } else {
    + rxtx_cfg = &cl->tx_cfg;
    + ret = ssi_check_tx_cfg(cfg);
    + }
    + if (ret < 0)
    + return ret;
    +
    + *rxtx_cfg = *cfg;
    + ret = hsi_setup(cl);
    + if (ret < 0)
    + return ret;
    +
    + if ((dir == HSI_CHAR_RX) && (cfg->mode == HSI_MODE_FRAME))
    + hsi_char_break_request(cl);
    +
    + return ret;
    +}
    +
    +static inline void hsi_char_cfg_get(struct hsi_client *cl,
    + struct hsi_config *cfg, int dir)
    +{
    + struct hsi_config *rxtx_cfg;
    +
    + if (dir == HSI_CHAR_RX)
    + rxtx_cfg = &cl->rx_cfg;
    + else
    + rxtx_cfg = &cl->tx_cfg;
    + *cfg = *rxtx_cfg;
    +}
    +
    +static inline void hsi_char_rx2icfg(struct hsi_config *cfg,
    + struct hsc_rx_config *rx_cfg)
    +{
    + cfg->mode = rx_cfg->mode;
    + cfg->flow = rx_cfg->flow;
    + cfg->channels = rx_cfg->channels;
    + cfg->speed = 0;
    +}
    +
    +static inline void hsi_char_tx2icfg(struct hsi_config *cfg,
    + struct hsc_tx_config *tx_cfg)
    +{
    + cfg->mode = tx_cfg->mode;
    + cfg->channels = tx_cfg->channels;
    + cfg->speed = tx_cfg->speed;
    + cfg->arb_mode = tx_cfg->arb_mode;
    +}
    +
    +static inline void hsi_char_rx2ecfg(struct hsc_rx_config *rx_cfg,
    + struct hsi_config *cfg)
    +{
    + rx_cfg->mode = cfg->mode;
    + rx_cfg->flow = cfg->flow;
    + rx_cfg->channels = cfg->channels;
    +}
    +
    +static inline void hsi_char_tx2ecfg(struct hsc_tx_config *tx_cfg,
    + struct hsi_config *cfg)
    +{
    + tx_cfg->mode = cfg->mode;
    + tx_cfg->channels = cfg->channels;
    + tx_cfg->speed = cfg->speed;
    + tx_cfg->arb_mode = cfg->arb_mode;
    +}
    +
    +static ssize_t hsi_char_read(struct file *file, char __user *buf,
    + size_t len, loff_t *ppos)
    +{
    + struct hsi_char_channel *channel = file->private_data;
    + struct hsi_msg *msg = NULL;
    + ssize_t ret;
    +
    + if (len == 0) {
    + channel->poll_event &= ~POLLPRI;
    + return 0;
    + }
    + channel->poll_event &= ~POLLPRI;
    +
    + if (!IS_ALIGNED(len, sizeof(u32)))
    + return -EINVAL;
    +
    + if (len > max_data_size)
    + len = max_data_size;
    +
    + spin_lock_bh(&channel->lock);
    + if (HSI_CHST_OC(channel) != HSI_CHST_OPENED) {
    + ret = -ENODEV;
    + goto out;
    + }
    + if (HSI_CHST_RD(channel) != HSI_CHST_READOFF) {
    + ret = -EBUSY;
    + goto out;
    + }
    + if (channel->ch >= channel->cl->rx_cfg.channels) {
    + ret = -ENODEV;
    + goto out;
    + }
    + if (list_empty(&channel->free_msgs_list)) {
    + ret = -ENOMEM;
    + goto out;
    + }
    + msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
    + list_del(&msg->link);
    + spin_unlock_bh(&channel->lock);
    + hsi_char_msg_len_set(msg, len);
    + msg->complete = hsi_char_rx_completed;
    + msg->destructor = hsi_char_rx_msg_destructor;
    + ret = hsi_async_read(channel->cl, msg);
    + spin_lock_bh(&channel->lock);
    + if (ret < 0)
    + goto out;
    + HSI_CHST_RD_SET(channel, HSI_CHST_READING);
    + msg = NULL;
    +
    + for ( ; ; ) {
    + DEFINE_WAIT(wait);
    +
    + if (!list_empty(&channel->rx_msgs_queue)) {
    + msg = list_first_entry(&channel->rx_msgs_queue,
    + struct hsi_msg, link);
    + HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
    + channel->poll_event &= ~(POLLIN | POLLRDNORM);
    + list_del(&msg->link);
    + spin_unlock_bh(&channel->lock);
    + if (msg->status == HSI_STATUS_ERROR) {
    + ret = -EIO;
    + } else {
    + ret = copy_to_user((void __user *)buf,
    + msg->context,
    + hsi_char_msg_len_get(msg));
    + if (ret)
    + ret = -EFAULT;
    + else
    + ret = hsi_char_msg_len_get(msg);
    + }
    + spin_lock_bh(&channel->lock);
    + break;
    + } else if (signal_pending(current)) {
    + spin_unlock_bh(&channel->lock);
    + hsi_char_rx_cancel(channel);
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
    + ret = -EINTR;
    + break;
    + } else if ((HSI_CHST_OC(channel) == HSI_CHST_CLOSING) ||
    + (HSI_CHST_OC(channel) == HSI_CHST_CLOSING)) {
    + ret = -EIO;
    + break;
    + }
    + prepare_to_wait(&channel->rx_wait, &wait, TASK_INTERRUPTIBLE);
    + spin_unlock_bh(&channel->lock);
    +
    + schedule();
    +
    + spin_lock_bh(&channel->lock);
    + finish_wait(&channel->rx_wait, &wait);
    + }
    +out:
    + if (msg)
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    + spin_unlock_bh(&channel->lock);
    +
    + return ret;
    +}
    +
    +static ssize_t hsi_char_write(struct file *file, const char __user *buf,
    + size_t len, loff_t *ppos)
    +{
    + struct hsi_char_channel *channel = file->private_data;
    + struct hsi_msg *msg = NULL;
    + ssize_t ret;
    +
    + if ((len == 0) || !IS_ALIGNED(len, sizeof(u32)))
    + return -EINVAL;
    +
    + if (len > max_data_size)
    + len = max_data_size;
    +
    + spin_lock_bh(&channel->lock);
    + if (HSI_CHST_OC(channel) != HSI_CHST_OPENED) {
    + ret = -ENODEV;
    + goto out;
    + }
    + if (HSI_CHST_WR(channel) != HSI_CHST_WRITEOFF) {
    + ret = -EBUSY;
    + goto out;
    + }
    + if (channel->ch >= channel->cl->tx_cfg.channels) {
    + ret = -ENODEV;
    + goto out;
    + }
    + if (list_empty(&channel->free_msgs_list)) {
    + ret = -ENOMEM;
    + goto out;
    + }
    + msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
    + list_del(&msg->link);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEON);
    + spin_unlock_bh(&channel->lock);
    +
    + if (copy_from_user(msg->context, (void __user *)buf, len)) {
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
    + ret = -EFAULT;
    + goto out;
    + }
    +
    + hsi_char_msg_len_set(msg, len);
    + msg->complete = hsi_char_tx_completed;
    + msg->destructor = hsi_char_tx_msg_destructor;
    + channel->poll_event &= ~(POLLOUT | POLLWRNORM);
    + ret = hsi_async_write(channel->cl, msg);
    + spin_lock_bh(&channel->lock);
    + if (ret < 0) {
    + channel->poll_event |= (POLLOUT | POLLWRNORM);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
    + goto out;
    + }
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITING);
    + msg = NULL;
    +
    + for ( ; ; ) {
    + DEFINE_WAIT(wait);
    +
    + if (!list_empty(&channel->tx_msgs_queue)) {
    + msg = list_first_entry(&channel->tx_msgs_queue,
    + struct hsi_msg, link);
    + list_del(&msg->link);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
    + if (msg->status == HSI_STATUS_ERROR)
    + ret = -EIO;
    + else
    + ret = hsi_char_msg_len_get(msg);
    + break;
    + } else if (signal_pending(current)) {
    + spin_unlock_bh(&channel->lock);
    + hsi_char_tx_cancel(channel);
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
    + ret = -EINTR;
    + break;
    + } else if ((HSI_CHST_OC(channel) == HSI_CHST_CLOSING) ||
    + (HSI_CHST_OC(channel) == HSI_CHST_CLOSING)) {
    + ret = -EIO;
    + break;
    + }
    + prepare_to_wait(&channel->tx_wait, &wait, TASK_INTERRUPTIBLE);
    + spin_unlock_bh(&channel->lock);
    +
    + schedule();
    +
    + spin_lock_bh(&channel->lock);
    + finish_wait(&channel->tx_wait, &wait);
    + }
    +out:
    + if (msg)
    + list_add_tail(&msg->link, &channel->free_msgs_list);
    +
    + spin_unlock_bh(&channel->lock);
    +
    + return ret;
    +}
    +
    +static unsigned int hsi_char_poll(struct file *file, poll_table *wait)
    +{
    + struct hsi_char_channel *channel = file->private_data;
    + unsigned int ret;
    +
    + spin_lock_bh(&channel->lock);
    + if ((HSI_CHST_OC(channel) != HSI_CHST_OPENED) ||
    + (channel->ch >= channel->cl->rx_cfg.channels)) {
    + spin_unlock_bh(&channel->lock);
    + return -ENODEV;
    + }
    + poll_wait(file, &channel->rx_wait, wait);
    + poll_wait(file, &channel->tx_wait, wait);
    + ret = channel->poll_event;
    + spin_unlock_bh(&channel->lock);
    + hsi_char_rx_poll(channel);
    +
    + return ret;
    +}
    +
    +static long hsi_char_ioctl(struct file *file, unsigned int cmd,
    + unsigned long arg)
    +{
    + struct hsi_char_channel *channel = file->private_data;
    + unsigned int state;
    + struct hsi_config cfg;
    + struct hsc_rx_config rx_cfg;
    + struct hsc_tx_config tx_cfg;
    + long ret = 0;
    +
    + if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
    + return -ENODEV;
    +
    + switch (cmd) {
    + case HSC_RESET:
    + hsi_char_reset(channel->cl);
    + break;
    + case HSC_SET_PM:
    + if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
    + return -EFAULT;
    + if (state == HSC_PM_DISABLE) {
    + ret = hsi_start_tx(channel->cl);
    + if (!ret)
    + channel->wlrefcnt++;
    + } else if ((state == HSC_PM_ENABLE)
    + && (channel->wlrefcnt > 0)) {
    + ret = hsi_stop_tx(channel->cl);
    + if (!ret)
    + channel->wlrefcnt--;
    + } else {
    + ret = -EINVAL;
    + }
    + break;
    + case HSC_SEND_BREAK:
    + return hsi_char_break_send(channel->cl);
    + case HSC_SET_RX:
    + if (copy_from_user(&rx_cfg, (void __user *)arg, sizeof(rx_cfg)))
    + return -EFAULT;
    + hsi_char_rx2icfg(&cfg, &rx_cfg);
    + return hsi_char_cfg_set(channel->cl, &cfg, HSI_CHAR_RX);
    + case HSC_GET_RX:
    + hsi_char_cfg_get(channel->cl, &cfg, HSI_CHAR_RX);
    + hsi_char_rx2ecfg(&rx_cfg, &cfg);
    + if (copy_to_user((void __user *)arg, &rx_cfg, sizeof(rx_cfg)))
    + return -EFAULT;
    + break;
    + case HSC_SET_TX:
    + if (copy_from_user(&tx_cfg, (void __user *)arg, sizeof(tx_cfg)))
    + return -EFAULT;
    + hsi_char_tx2icfg(&cfg, &tx_cfg);
    + return hsi_char_cfg_set(channel->cl, &cfg, HSI_CHAR_TX);
    + case HSC_GET_TX:
    + hsi_char_cfg_get(channel->cl, &cfg, HSI_CHAR_TX);
    + hsi_char_tx2ecfg(&tx_cfg, &cfg);
    + if (copy_to_user((void __user *)arg, &tx_cfg, sizeof(tx_cfg)))
    + return -EFAULT;
    + break;
    + default:
    + return -ENOIOCTLCMD;
    + }
    +
    + return ret;
    +}
    +
    +static int hsi_char_open(struct inode *inode, struct file *file)
    +{
    + struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
    + struct hsi_char_channel *channel = cl_data->channels + iminor(inode);
    + int ret = 0, refcnt;
    +
    + spin_lock_bh(&channel->lock);
    + if ((channel->state == HSI_CHST_UNAVAIL) || (!channel->cl)) {
    + ret = -ENODEV;
    + goto out;
    + }
    + if (HSI_CHST_OC(channel) != HSI_CHST_CLOSED) {
    + ret = -EBUSY;
    + goto out;
    + }
    + HSI_CHST_OC_SET(channel, HSI_CHST_OPENING);
    + spin_unlock_bh(&channel->lock);
    +
    + refcnt = atomic_inc_return(&cl_data->refcnt);
    + if (refcnt == 1) {
    + if (cl_data->attached) {
    + atomic_dec(&cl_data->refcnt);
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
    + ret = -EBUSY;
    + goto out;
    + }
    + ret = hsi_claim_port(channel->cl, 0);
    + if (ret < 0) {
    + atomic_dec(&cl_data->refcnt);
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
    + goto out;
    + }
    + hsi_setup(channel->cl);
    + } else if (!cl_data->attached) {
    + atomic_dec(&cl_data->refcnt);
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
    + ret = -ENODEV;
    + goto out;
    + }
    + ret = hsi_char_msgs_alloc(channel);
    +
    + if (ret < 0) {
    + refcnt = atomic_dec_return(&cl_data->refcnt);
    + if (!refcnt)
    + hsi_release_port(channel->cl);
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
    + goto out;
    + }
    + if (refcnt == 1)
    + cl_data->attached = 1;
    + channel->wlrefcnt = 0;
    + channel->rxpoll = HSI_CHAR_POLL_OFF;
    + channel->poll_event = (POLLOUT | POLLWRNORM);
    + file->private_data = channel;
    + spin_lock_bh(&channel->lock);
    + HSI_CHST_OC_SET(channel, HSI_CHST_OPENED);
    +out:
    + spin_unlock_bh(&channel->lock);
    +
    + return ret;
    +}
    +
    +static int hsi_char_release(struct inode *inode, struct file *file)
    +{
    + struct hsi_char_channel *channel = file->private_data;
    + return _hsi_char_release(channel, 0);
    +}
    +
    +static int hsi_char_fasync(int fd, struct file *file, int on)
    +{
    + struct hsi_char_channel *channel = file->private_data;
    +
    + if (fasync_helper(fd, file, on, &channel->async_queue) < 0)
    + return -EIO;
    +
    + return 0;
    +}
    +
    +static const struct file_operations hsi_char_fops = {
    + .owner = THIS_MODULE,
    + .read = hsi_char_read,
    + .write = hsi_char_write,
    + .poll = hsi_char_poll,
    + .unlocked_ioctl = hsi_char_ioctl,
    + .open = hsi_char_open,
    + .release = hsi_char_release,
    + .fasync = hsi_char_fasync,
    +};
    +
    +static struct hsi_client_driver hsi_char_driver = {
    + .driver = {
    + .name = "hsi_char",
    + .owner = THIS_MODULE,
    + .probe = hsi_char_probe,
    + .remove = hsi_char_remove,
    + },
    +};
    +
    +static inline void hsi_char_channel_init(struct hsi_char_channel *channel)
    +{
    + channel->state = HSI_CHST_AVAIL;
    + INIT_LIST_HEAD(&channel->free_msgs_list);
    + init_waitqueue_head(&channel->rx_wait);
    + init_waitqueue_head(&channel->tx_wait);
    + spin_lock_init(&channel->lock);
    + INIT_LIST_HEAD(&channel->rx_msgs_queue);
    + INIT_LIST_HEAD(&channel->tx_msgs_queue);
    +}
    +
    +static struct cdev hsi_char_cdev;
    +
    +static int __init hsi_char_init(void)
    +{
    + char devname[] = "hsi_char";
    + struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
    + struct hsi_char_channel *channel = cl_data->channels;
    + unsigned long ch_mask = 0;
    + unsigned int i;
    + int ret;
    +
    + if ((max_data_size < 4) || (max_data_size > 0x10000) ||
    + (max_data_size & (max_data_size - 1))) {
    + pr_err("Invalid max read/write data size");
    + return -EINVAL;
    + }
    +
    + for (i = 0; i < HSI_CHAR_DEVS && channels_map[i] >= 0; i++) {
    + if (channels_map[i] >= HSI_CHAR_DEVS) {
    + pr_err("Invalid HSI/SSI channel specified");
    + return -EINVAL;
    + }
    + set_bit(channels_map[i], &ch_mask);
    + }
    +
    + if (i == 0) {
    + pr_err("No HSI channels available");
    + return -EINVAL;
    + }
    +
    + memset(cl_data->channels, 0, sizeof(cl_data->channels));
    + for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
    + channel->ch = i;
    + channel->state = HSI_CHST_UNAVAIL;
    + if (test_bit(i, &ch_mask))
    + hsi_char_channel_init(channel);
    + }
    +
    + ret = hsi_register_client_driver(&hsi_char_driver);
    + if (ret) {
    + pr_err("Error while registering HSI/SSI driver %d", ret);
    + return ret;
    + }
    +
    + ret = alloc_chrdev_region(&hsi_char_dev, 0, HSI_CHAR_DEVS, devname);
    + if (ret < 0) {
    + hsi_unregister_client_driver(&hsi_char_driver);
    + return ret;
    + }
    +
    + cdev_init(&hsi_char_cdev, &hsi_char_fops);
    + ret = cdev_add(&hsi_char_cdev, hsi_char_dev, HSI_CHAR_DEVS);
    + if (ret) {
    + unregister_chrdev_region(hsi_char_dev, HSI_CHAR_DEVS);
    + hsi_unregister_client_driver(&hsi_char_driver);
    + return ret;
    + }
    +
    + pr_info("HSI/SSI char device loaded\n");
    +
    + return 0;
    +}
    +module_init(hsi_char_init);
    +
    +static void __exit hsi_char_exit(void)
    +{
    + cdev_del(&hsi_char_cdev);
    + unregister_chrdev_region(hsi_char_dev, HSI_CHAR_DEVS);
    + hsi_unregister_client_driver(&hsi_char_driver);
    + pr_info("HSI char device removed\n");
    +}
    +module_exit(hsi_char_exit);
    +
    +MODULE_AUTHOR("Andras Domokos <andras.domokos@nokia.com>");
    +MODULE_ALIAS("hsi:hsi_char");
    +MODULE_DESCRIPTION("HSI character device");
    +MODULE_LICENSE("GPL v2");
    diff --git a/include/linux/hsi/hsi_char.h b/include/linux/hsi/hsi_char.h
    new file mode 100644
    index 0000000..fc49897
    --- /dev/null
    +++ b/include/linux/hsi/hsi_char.h
    @@ -0,0 +1,65 @@
    +/*
    + * hsi_char.h
    + *
    + * Part of the HSI character device driver.
    + *
    + * Copyright (C) 2010 Nokia Corporation. All rights reserved.
    + *
    + * Contact: Andras Domokos <andras.domokos at nokia.com>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * version 2 as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope that it will be useful, but
    + * WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    + * General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
    + * 02110-1301 USA
    + */
    +
    +
    +#ifndef __HSI_CHAR_H
    +#define __HSI_CHAR_H
    +
    +#define HSI_CHAR_MAGIC 'k'
    +#define HSC_IOW(num, dtype) _IOW(HSI_CHAR_MAGIC, num, dtype)
    +#define HSC_IOR(num, dtype) _IOR(HSI_CHAR_MAGIC, num, dtype)
    +#define HSC_IOWR(num, dtype) _IOWR(HSI_CHAR_MAGIC, num, dtype)
    +#define HSC_IO(num) _IO(HSI_CHAR_MAGIC, num)
    +
    +#define HSC_RESET HSC_IO(16)
    +#define HSC_SET_PM HSC_IO(17)
    +#define HSC_SEND_BREAK HSC_IO(18)
    +#define HSC_SET_RX HSC_IOW(19, struct hsc_rx_config)
    +#define HSC_GET_RX HSC_IOW(20, struct hsc_rx_config)
    +#define HSC_SET_TX HSC_IOW(21, struct hsc_tx_config)
    +#define HSC_GET_TX HSC_IOW(22, struct hsc_tx_config)
    +
    +#define HSC_PM_DISABLE 0
    +#define HSC_PM_ENABLE 1
    +
    +#define HSC_MODE_STREAM 1
    +#define HSC_MODE_FRAME 2
    +#define HSC_FLOW_SYNC 0
    +#define HSC_ARB_RR 0
    +#define HSC_ARB_PRIO 1
    +
    +struct hsc_rx_config {
    + uint32_t mode;
    + uint32_t flow;
    + uint32_t channels;
    +};
    +
    +struct hsc_tx_config {
    + uint32_t mode;
    + uint32_t channels;
    + uint32_t speed;
    + uint32_t arb_mode;
    +};
    +
    +#endif /* __HSI_CHAR_H */
    --
    1.7.1


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      Last update: 2010-12-14 11:13    [W:0.088 / U:35.288 seconds]
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