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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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