![Kim Lilliestierna XX](/assets/img/avatar_default.png)
Use dev_dbg instead of dev_err for reporting in cfhsi_wakeup_cb. Signed-off-by: Kim Lilliestierna <kim.xx.lilliestierna@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1337 lines
31 KiB
C
1337 lines
31 KiB
C
/*
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* Copyright (C) ST-Ericsson AB 2010
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* Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
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* Author: Daniel Martensson / daniel.martensson@stericsson.com
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* Dmitry.Tarnyagin / dmitry.tarnyagin@stericsson.com
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* License terms: GNU General Public License (GPL) version 2.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/netdevice.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <linux/rtnetlink.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/caif_hsi.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>");
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MODULE_DESCRIPTION("CAIF HSI driver");
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/* Returns the number of padding bytes for alignment. */
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#define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\
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(((pow)-((x)&((pow)-1)))))
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static int inactivity_timeout = 1000;
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module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms.");
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/*
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* HSI padding options.
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* Warning: must be a base of 2 (& operation used) and can not be zero !
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*/
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static int hsi_head_align = 4;
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module_param(hsi_head_align, int, S_IRUGO);
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MODULE_PARM_DESC(hsi_head_align, "HSI head alignment.");
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static int hsi_tail_align = 4;
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module_param(hsi_tail_align, int, S_IRUGO);
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MODULE_PARM_DESC(hsi_tail_align, "HSI tail alignment.");
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/*
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* HSI link layer flowcontrol thresholds.
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* Warning: A high threshold value migth increase throughput but it will at
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* the same time prevent channel prioritization and increase the risk of
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* flooding the modem. The high threshold should be above the low.
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*/
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static int hsi_high_threshold = 100;
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module_param(hsi_high_threshold, int, S_IRUGO);
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MODULE_PARM_DESC(hsi_high_threshold, "HSI high threshold (FLOW OFF).");
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static int hsi_low_threshold = 50;
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module_param(hsi_low_threshold, int, S_IRUGO);
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MODULE_PARM_DESC(hsi_low_threshold, "HSI high threshold (FLOW ON).");
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#define ON 1
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#define OFF 0
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/*
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* Threshold values for the HSI packet queue. Flowcontrol will be asserted
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* when the number of packets exceeds HIGH_WATER_MARK. It will not be
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* de-asserted before the number of packets drops below LOW_WATER_MARK.
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*/
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#define LOW_WATER_MARK hsi_low_threshold
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#define HIGH_WATER_MARK hsi_high_threshold
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static LIST_HEAD(cfhsi_list);
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static spinlock_t cfhsi_list_lock;
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static void cfhsi_inactivity_tout(unsigned long arg)
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{
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struct cfhsi *cfhsi = (struct cfhsi *)arg;
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dev_dbg(&cfhsi->ndev->dev, "%s.\n",
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__func__);
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/* Schedule power down work queue. */
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if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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queue_work(cfhsi->wq, &cfhsi->wake_down_work);
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}
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static void cfhsi_abort_tx(struct cfhsi *cfhsi)
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{
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struct sk_buff *skb;
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for (;;) {
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spin_lock_bh(&cfhsi->lock);
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skb = skb_dequeue(&cfhsi->qhead);
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if (!skb)
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break;
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cfhsi->ndev->stats.tx_errors++;
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cfhsi->ndev->stats.tx_dropped++;
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spin_unlock_bh(&cfhsi->lock);
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kfree_skb(skb);
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}
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cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
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if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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mod_timer(&cfhsi->timer,
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jiffies + cfhsi->inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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}
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static int cfhsi_flush_fifo(struct cfhsi *cfhsi)
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{
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char buffer[32]; /* Any reasonable value */
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size_t fifo_occupancy;
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int ret;
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dev_dbg(&cfhsi->ndev->dev, "%s.\n",
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__func__);
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do {
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ret = cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev,
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&fifo_occupancy);
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if (ret) {
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dev_warn(&cfhsi->ndev->dev,
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"%s: can't get FIFO occupancy: %d.\n",
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__func__, ret);
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break;
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} else if (!fifo_occupancy)
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/* No more data, exitting normally */
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break;
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fifo_occupancy = min(sizeof(buffer), fifo_occupancy);
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set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
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ret = cfhsi->dev->cfhsi_rx(buffer, fifo_occupancy,
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cfhsi->dev);
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if (ret) {
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clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
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dev_warn(&cfhsi->ndev->dev,
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"%s: can't read data: %d.\n",
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__func__, ret);
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break;
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}
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ret = 5 * HZ;
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ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait,
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!test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret);
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if (ret < 0) {
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dev_warn(&cfhsi->ndev->dev,
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"%s: can't wait for flush complete: %d.\n",
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__func__, ret);
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break;
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} else if (!ret) {
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ret = -ETIMEDOUT;
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dev_warn(&cfhsi->ndev->dev,
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"%s: timeout waiting for flush complete.\n",
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__func__);
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break;
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}
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} while (1);
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return ret;
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}
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static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int nfrms = 0;
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int pld_len = 0;
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struct sk_buff *skb;
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u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
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skb = skb_dequeue(&cfhsi->qhead);
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if (!skb)
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return 0;
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/* Clear offset. */
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desc->offset = 0;
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/* Check if we can embed a CAIF frame. */
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if (skb->len < CFHSI_MAX_EMB_FRM_SZ) {
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struct caif_payload_info *info;
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int hpad = 0;
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int tpad = 0;
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/* Calculate needed head alignment and tail alignment. */
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info = (struct caif_payload_info *)&skb->cb;
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hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align);
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tpad = PAD_POW2((skb->len + hpad), hsi_tail_align);
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/* Check if frame still fits with added alignment. */
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if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) {
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u8 *pemb = desc->emb_frm;
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desc->offset = CFHSI_DESC_SHORT_SZ;
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*pemb = (u8)(hpad - 1);
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pemb += hpad;
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/* Update network statistics. */
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cfhsi->ndev->stats.tx_packets++;
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cfhsi->ndev->stats.tx_bytes += skb->len;
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/* Copy in embedded CAIF frame. */
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skb_copy_bits(skb, 0, pemb, skb->len);
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consume_skb(skb);
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skb = NULL;
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}
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}
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/* Create payload CAIF frames. */
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pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
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while (nfrms < CFHSI_MAX_PKTS) {
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struct caif_payload_info *info;
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int hpad = 0;
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int tpad = 0;
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if (!skb)
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skb = skb_dequeue(&cfhsi->qhead);
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if (!skb)
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break;
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/* Calculate needed head alignment and tail alignment. */
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info = (struct caif_payload_info *)&skb->cb;
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hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align);
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tpad = PAD_POW2((skb->len + hpad), hsi_tail_align);
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/* Fill in CAIF frame length in descriptor. */
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desc->cffrm_len[nfrms] = hpad + skb->len + tpad;
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/* Fill head padding information. */
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*pfrm = (u8)(hpad - 1);
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pfrm += hpad;
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/* Update network statistics. */
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cfhsi->ndev->stats.tx_packets++;
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cfhsi->ndev->stats.tx_bytes += skb->len;
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/* Copy in CAIF frame. */
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skb_copy_bits(skb, 0, pfrm, skb->len);
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/* Update payload length. */
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pld_len += desc->cffrm_len[nfrms];
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/* Update frame pointer. */
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pfrm += skb->len + tpad;
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consume_skb(skb);
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skb = NULL;
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/* Update number of frames. */
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nfrms++;
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}
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/* Unused length fields should be zero-filled (according to SPEC). */
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while (nfrms < CFHSI_MAX_PKTS) {
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desc->cffrm_len[nfrms] = 0x0000;
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nfrms++;
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}
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/* Check if we can piggy-back another descriptor. */
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skb = skb_peek(&cfhsi->qhead);
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if (skb)
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desc->header |= CFHSI_PIGGY_DESC;
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else
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desc->header &= ~CFHSI_PIGGY_DESC;
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return CFHSI_DESC_SZ + pld_len;
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}
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static void cfhsi_tx_done(struct cfhsi *cfhsi)
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{
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struct cfhsi_desc *desc = NULL;
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int len = 0;
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int res;
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dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
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if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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return;
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desc = (struct cfhsi_desc *)cfhsi->tx_buf;
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do {
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/*
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* Send flow on if flow off has been previously signalled
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* and number of packets is below low water mark.
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*/
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spin_lock_bh(&cfhsi->lock);
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if (cfhsi->flow_off_sent &&
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cfhsi->qhead.qlen <= cfhsi->q_low_mark &&
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cfhsi->cfdev.flowctrl) {
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cfhsi->flow_off_sent = 0;
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cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
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}
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spin_unlock_bh(&cfhsi->lock);
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/* Create HSI frame. */
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do {
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len = cfhsi_tx_frm(desc, cfhsi);
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if (!len) {
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spin_lock_bh(&cfhsi->lock);
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if (unlikely(skb_peek(&cfhsi->qhead))) {
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spin_unlock_bh(&cfhsi->lock);
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continue;
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}
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cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
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/* Start inactivity timer. */
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mod_timer(&cfhsi->timer,
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jiffies + cfhsi->inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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goto done;
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}
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} while (!len);
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/* Set up new transfer. */
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res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
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if (WARN_ON(res < 0)) {
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dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
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__func__, res);
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}
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} while (res < 0);
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done:
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return;
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}
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static void cfhsi_tx_done_cb(struct cfhsi_drv *drv)
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{
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struct cfhsi *cfhsi;
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cfhsi = container_of(drv, struct cfhsi, drv);
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dev_dbg(&cfhsi->ndev->dev, "%s.\n",
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__func__);
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if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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return;
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cfhsi_tx_done(cfhsi);
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}
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static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int xfer_sz = 0;
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int nfrms = 0;
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u16 *plen = NULL;
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u8 *pfrm = NULL;
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if ((desc->header & ~CFHSI_PIGGY_DESC) ||
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(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n",
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__func__);
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return -EPROTO;
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}
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/* Check for embedded CAIF frame. */
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if (desc->offset) {
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struct sk_buff *skb;
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u8 *dst = NULL;
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int len = 0;
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pfrm = ((u8 *)desc) + desc->offset;
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/* Remove offset padding. */
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pfrm += *pfrm + 1;
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/* Read length of CAIF frame (little endian). */
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len = *pfrm;
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len |= ((*(pfrm+1)) << 8) & 0xFF00;
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len += 2; /* Add FCS fields. */
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/* Sanity check length of CAIF frame. */
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if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n",
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__func__);
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return -EPROTO;
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}
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/* Allocate SKB (OK even in IRQ context). */
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skb = alloc_skb(len + 1, GFP_ATOMIC);
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if (!skb) {
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dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n",
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__func__);
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return -ENOMEM;
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}
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caif_assert(skb != NULL);
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dst = skb_put(skb, len);
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memcpy(dst, pfrm, len);
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skb->protocol = htons(ETH_P_CAIF);
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skb_reset_mac_header(skb);
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skb->dev = cfhsi->ndev;
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/*
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* We are called from a arch specific platform device.
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* Unfortunately we don't know what context we're
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* running in.
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*/
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if (in_interrupt())
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netif_rx(skb);
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else
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netif_rx_ni(skb);
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/* Update network statistics. */
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cfhsi->ndev->stats.rx_packets++;
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cfhsi->ndev->stats.rx_bytes += len;
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}
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/* Calculate transfer length. */
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plen = desc->cffrm_len;
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while (nfrms < CFHSI_MAX_PKTS && *plen) {
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xfer_sz += *plen;
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plen++;
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nfrms++;
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}
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/* Check for piggy-backed descriptor. */
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if (desc->header & CFHSI_PIGGY_DESC)
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xfer_sz += CFHSI_DESC_SZ;
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if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) {
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dev_err(&cfhsi->ndev->dev,
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"%s: Invalid payload len: %d, ignored.\n",
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__func__, xfer_sz);
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return -EPROTO;
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}
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return xfer_sz;
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}
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static int cfhsi_rx_desc_len(struct cfhsi_desc *desc)
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{
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int xfer_sz = 0;
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int nfrms = 0;
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u16 *plen;
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if ((desc->header & ~CFHSI_PIGGY_DESC) ||
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(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
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pr_err("Invalid descriptor. %x %x\n", desc->header,
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desc->offset);
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return -EPROTO;
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}
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/* Calculate transfer length. */
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plen = desc->cffrm_len;
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while (nfrms < CFHSI_MAX_PKTS && *plen) {
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xfer_sz += *plen;
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plen++;
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nfrms++;
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}
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if (xfer_sz % 4) {
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pr_err("Invalid payload len: %d, ignored.\n", xfer_sz);
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return -EPROTO;
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}
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return xfer_sz;
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}
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static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int rx_sz = 0;
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int nfrms = 0;
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u16 *plen = NULL;
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u8 *pfrm = NULL;
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/* Sanity check header and offset. */
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if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) ||
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(desc->offset > CFHSI_MAX_EMB_FRM_SZ))) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n",
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__func__);
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return -EPROTO;
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}
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/* Set frame pointer to start of payload. */
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pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
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plen = desc->cffrm_len;
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/* Skip already processed frames. */
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while (nfrms < cfhsi->rx_state.nfrms) {
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pfrm += *plen;
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rx_sz += *plen;
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plen++;
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nfrms++;
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}
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|
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/* Parse payload. */
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while (nfrms < CFHSI_MAX_PKTS && *plen) {
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struct sk_buff *skb;
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u8 *dst = NULL;
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u8 *pcffrm = NULL;
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int len = 0;
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/* CAIF frame starts after head padding. */
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pcffrm = pfrm + *pfrm + 1;
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|
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/* Read length of CAIF frame (little endian). */
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len = *pcffrm;
|
|
len |= ((*(pcffrm + 1)) << 8) & 0xFF00;
|
|
len += 2; /* Add FCS fields. */
|
|
|
|
/* Sanity check length of CAIF frames. */
|
|
if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
|
|
dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n",
|
|
__func__);
|
|
return -EPROTO;
|
|
}
|
|
|
|
/* Allocate SKB (OK even in IRQ context). */
|
|
skb = alloc_skb(len + 1, GFP_ATOMIC);
|
|
if (!skb) {
|
|
dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n",
|
|
__func__);
|
|
cfhsi->rx_state.nfrms = nfrms;
|
|
return -ENOMEM;
|
|
}
|
|
caif_assert(skb != NULL);
|
|
|
|
dst = skb_put(skb, len);
|
|
memcpy(dst, pcffrm, len);
|
|
|
|
skb->protocol = htons(ETH_P_CAIF);
|
|
skb_reset_mac_header(skb);
|
|
skb->dev = cfhsi->ndev;
|
|
|
|
/*
|
|
* We're called from a platform device,
|
|
* and don't know the context we're running in.
|
|
*/
|
|
if (in_interrupt())
|
|
netif_rx(skb);
|
|
else
|
|
netif_rx_ni(skb);
|
|
|
|
/* Update network statistics. */
|
|
cfhsi->ndev->stats.rx_packets++;
|
|
cfhsi->ndev->stats.rx_bytes += len;
|
|
|
|
pfrm += *plen;
|
|
rx_sz += *plen;
|
|
plen++;
|
|
nfrms++;
|
|
}
|
|
|
|
return rx_sz;
|
|
}
|
|
|
|
static void cfhsi_rx_done(struct cfhsi *cfhsi)
|
|
{
|
|
int res;
|
|
int desc_pld_len = 0, rx_len, rx_state;
|
|
struct cfhsi_desc *desc = NULL;
|
|
u8 *rx_ptr, *rx_buf;
|
|
struct cfhsi_desc *piggy_desc = NULL;
|
|
|
|
desc = (struct cfhsi_desc *)cfhsi->rx_buf;
|
|
|
|
dev_dbg(&cfhsi->ndev->dev, "%s\n", __func__);
|
|
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
|
return;
|
|
|
|
/* Update inactivity timer if pending. */
|
|
spin_lock_bh(&cfhsi->lock);
|
|
mod_timer_pending(&cfhsi->timer,
|
|
jiffies + cfhsi->inactivity_timeout);
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
|
|
if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
|
|
desc_pld_len = cfhsi_rx_desc_len(desc);
|
|
|
|
if (desc_pld_len < 0)
|
|
goto out_of_sync;
|
|
|
|
rx_buf = cfhsi->rx_buf;
|
|
rx_len = desc_pld_len;
|
|
if (desc_pld_len > 0 && (desc->header & CFHSI_PIGGY_DESC))
|
|
rx_len += CFHSI_DESC_SZ;
|
|
if (desc_pld_len == 0)
|
|
rx_buf = cfhsi->rx_flip_buf;
|
|
} else {
|
|
rx_buf = cfhsi->rx_flip_buf;
|
|
|
|
rx_len = CFHSI_DESC_SZ;
|
|
if (cfhsi->rx_state.pld_len > 0 &&
|
|
(desc->header & CFHSI_PIGGY_DESC)) {
|
|
|
|
piggy_desc = (struct cfhsi_desc *)
|
|
(desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ +
|
|
cfhsi->rx_state.pld_len);
|
|
|
|
cfhsi->rx_state.piggy_desc = true;
|
|
|
|
/* Extract payload len from piggy-backed descriptor. */
|
|
desc_pld_len = cfhsi_rx_desc_len(piggy_desc);
|
|
if (desc_pld_len < 0)
|
|
goto out_of_sync;
|
|
|
|
if (desc_pld_len > 0)
|
|
rx_len = desc_pld_len;
|
|
|
|
if (desc_pld_len > 0 &&
|
|
(piggy_desc->header & CFHSI_PIGGY_DESC))
|
|
rx_len += CFHSI_DESC_SZ;
|
|
|
|
/*
|
|
* Copy needed information from the piggy-backed
|
|
* descriptor to the descriptor in the start.
|
|
*/
|
|
memcpy(rx_buf, (u8 *)piggy_desc,
|
|
CFHSI_DESC_SHORT_SZ);
|
|
/* Mark no embedded frame here */
|
|
piggy_desc->offset = 0;
|
|
if (desc_pld_len == -EPROTO)
|
|
goto out_of_sync;
|
|
}
|
|
}
|
|
|
|
if (desc_pld_len) {
|
|
rx_state = CFHSI_RX_STATE_PAYLOAD;
|
|
rx_ptr = rx_buf + CFHSI_DESC_SZ;
|
|
} else {
|
|
rx_state = CFHSI_RX_STATE_DESC;
|
|
rx_ptr = rx_buf;
|
|
rx_len = CFHSI_DESC_SZ;
|
|
}
|
|
|
|
/* Initiate next read */
|
|
if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) {
|
|
/* Set up new transfer. */
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n",
|
|
__func__);
|
|
|
|
res = cfhsi->dev->cfhsi_rx(rx_ptr, rx_len,
|
|
cfhsi->dev);
|
|
if (WARN_ON(res < 0)) {
|
|
dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n",
|
|
__func__, res);
|
|
cfhsi->ndev->stats.rx_errors++;
|
|
cfhsi->ndev->stats.rx_dropped++;
|
|
}
|
|
}
|
|
|
|
if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
|
|
/* Extract payload from descriptor */
|
|
if (cfhsi_rx_desc(desc, cfhsi) < 0)
|
|
goto out_of_sync;
|
|
} else {
|
|
/* Extract payload */
|
|
if (cfhsi_rx_pld(desc, cfhsi) < 0)
|
|
goto out_of_sync;
|
|
if (piggy_desc) {
|
|
/* Extract any payload in piggyback descriptor. */
|
|
if (cfhsi_rx_desc(piggy_desc, cfhsi) < 0)
|
|
goto out_of_sync;
|
|
}
|
|
}
|
|
|
|
/* Update state info */
|
|
memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
|
|
cfhsi->rx_state.state = rx_state;
|
|
cfhsi->rx_ptr = rx_ptr;
|
|
cfhsi->rx_len = rx_len;
|
|
cfhsi->rx_state.pld_len = desc_pld_len;
|
|
cfhsi->rx_state.piggy_desc = desc->header & CFHSI_PIGGY_DESC;
|
|
|
|
if (rx_buf != cfhsi->rx_buf)
|
|
swap(cfhsi->rx_buf, cfhsi->rx_flip_buf);
|
|
return;
|
|
|
|
out_of_sync:
|
|
dev_err(&cfhsi->ndev->dev, "%s: Out of sync.\n", __func__);
|
|
print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE,
|
|
cfhsi->rx_buf, CFHSI_DESC_SZ);
|
|
schedule_work(&cfhsi->out_of_sync_work);
|
|
}
|
|
|
|
static void cfhsi_rx_slowpath(unsigned long arg)
|
|
{
|
|
struct cfhsi *cfhsi = (struct cfhsi *)arg;
|
|
|
|
dev_dbg(&cfhsi->ndev->dev, "%s.\n",
|
|
__func__);
|
|
|
|
cfhsi_rx_done(cfhsi);
|
|
}
|
|
|
|
static void cfhsi_rx_done_cb(struct cfhsi_drv *drv)
|
|
{
|
|
struct cfhsi *cfhsi;
|
|
|
|
cfhsi = container_of(drv, struct cfhsi, drv);
|
|
dev_dbg(&cfhsi->ndev->dev, "%s.\n",
|
|
__func__);
|
|
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
|
return;
|
|
|
|
if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits))
|
|
wake_up_interruptible(&cfhsi->flush_fifo_wait);
|
|
else
|
|
cfhsi_rx_done(cfhsi);
|
|
}
|
|
|
|
static void cfhsi_wake_up(struct work_struct *work)
|
|
{
|
|
struct cfhsi *cfhsi = NULL;
|
|
int res;
|
|
int len;
|
|
long ret;
|
|
|
|
cfhsi = container_of(work, struct cfhsi, wake_up_work);
|
|
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
|
return;
|
|
|
|
if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) {
|
|
/* It happenes when wakeup is requested by
|
|
* both ends at the same time. */
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
return;
|
|
}
|
|
|
|
/* Activate wake line. */
|
|
cfhsi->dev->cfhsi_wake_up(cfhsi->dev);
|
|
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n",
|
|
__func__);
|
|
|
|
/* Wait for acknowledge. */
|
|
ret = CFHSI_WAKE_TOUT;
|
|
ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait,
|
|
test_and_clear_bit(CFHSI_WAKE_UP_ACK,
|
|
&cfhsi->bits), ret);
|
|
if (unlikely(ret < 0)) {
|
|
/* Interrupted by signal. */
|
|
dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n",
|
|
__func__, ret);
|
|
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
|
cfhsi->dev->cfhsi_wake_down(cfhsi->dev);
|
|
return;
|
|
} else if (!ret) {
|
|
bool ca_wake = false;
|
|
size_t fifo_occupancy = 0;
|
|
|
|
/* Wakeup timeout */
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Timeout.\n",
|
|
__func__);
|
|
|
|
/* Check FIFO to check if modem has sent something. */
|
|
WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev,
|
|
&fifo_occupancy));
|
|
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Bytes in FIFO: %u.\n",
|
|
__func__, (unsigned) fifo_occupancy);
|
|
|
|
/* Check if we misssed the interrupt. */
|
|
WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev,
|
|
&ca_wake));
|
|
|
|
if (ca_wake) {
|
|
dev_err(&cfhsi->ndev->dev, "%s: CA Wake missed !.\n",
|
|
__func__);
|
|
|
|
/* Clear the CFHSI_WAKE_UP_ACK bit to prevent race. */
|
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
|
|
/* Continue execution. */
|
|
goto wake_ack;
|
|
}
|
|
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
|
cfhsi->dev->cfhsi_wake_down(cfhsi->dev);
|
|
return;
|
|
}
|
|
wake_ack:
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n",
|
|
__func__);
|
|
|
|
/* Clear power up bit. */
|
|
set_bit(CFHSI_AWAKE, &cfhsi->bits);
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
|
|
|
/* Resume read operation. */
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", __func__);
|
|
res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->dev);
|
|
|
|
if (WARN_ON(res < 0))
|
|
dev_err(&cfhsi->ndev->dev, "%s: RX err %d.\n", __func__, res);
|
|
|
|
/* Clear power up acknowledment. */
|
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
|
|
spin_lock_bh(&cfhsi->lock);
|
|
|
|
/* Resume transmit if queue is not empty. */
|
|
if (!skb_peek(&cfhsi->qhead)) {
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n",
|
|
__func__);
|
|
/* Start inactivity timer. */
|
|
mod_timer(&cfhsi->timer,
|
|
jiffies + cfhsi->inactivity_timeout);
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n",
|
|
__func__);
|
|
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
|
|
/* Create HSI frame. */
|
|
len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi);
|
|
|
|
if (likely(len > 0)) {
|
|
/* Set up new transfer. */
|
|
res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
|
|
if (WARN_ON(res < 0)) {
|
|
dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
|
|
__func__, res);
|
|
cfhsi_abort_tx(cfhsi);
|
|
}
|
|
} else {
|
|
dev_err(&cfhsi->ndev->dev,
|
|
"%s: Failed to create HSI frame: %d.\n",
|
|
__func__, len);
|
|
}
|
|
}
|
|
|
|
static void cfhsi_wake_down(struct work_struct *work)
|
|
{
|
|
long ret;
|
|
struct cfhsi *cfhsi = NULL;
|
|
size_t fifo_occupancy = 0;
|
|
int retry = CFHSI_WAKE_TOUT;
|
|
|
|
cfhsi = container_of(work, struct cfhsi, wake_down_work);
|
|
dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
|
|
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
|
return;
|
|
|
|
/* Deactivate wake line. */
|
|
cfhsi->dev->cfhsi_wake_down(cfhsi->dev);
|
|
|
|
/* Wait for acknowledge. */
|
|
ret = CFHSI_WAKE_TOUT;
|
|
ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait,
|
|
test_and_clear_bit(CFHSI_WAKE_DOWN_ACK,
|
|
&cfhsi->bits), ret);
|
|
if (ret < 0) {
|
|
/* Interrupted by signal. */
|
|
dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n",
|
|
__func__, ret);
|
|
return;
|
|
} else if (!ret) {
|
|
bool ca_wake = true;
|
|
|
|
/* Timeout */
|
|
dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", __func__);
|
|
|
|
/* Check if we misssed the interrupt. */
|
|
WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev,
|
|
&ca_wake));
|
|
if (!ca_wake)
|
|
dev_err(&cfhsi->ndev->dev, "%s: CA Wake missed !.\n",
|
|
__func__);
|
|
}
|
|
|
|
/* Check FIFO occupancy. */
|
|
while (retry) {
|
|
WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev,
|
|
&fifo_occupancy));
|
|
|
|
if (!fifo_occupancy)
|
|
break;
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(1);
|
|
retry--;
|
|
}
|
|
|
|
if (!retry)
|
|
dev_err(&cfhsi->ndev->dev, "%s: FIFO Timeout.\n", __func__);
|
|
|
|
/* Clear AWAKE condition. */
|
|
clear_bit(CFHSI_AWAKE, &cfhsi->bits);
|
|
|
|
/* Cancel pending RX requests. */
|
|
cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev);
|
|
|
|
}
|
|
|
|
static void cfhsi_out_of_sync(struct work_struct *work)
|
|
{
|
|
struct cfhsi *cfhsi = NULL;
|
|
|
|
cfhsi = container_of(work, struct cfhsi, out_of_sync_work);
|
|
|
|
rtnl_lock();
|
|
dev_close(cfhsi->ndev);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static void cfhsi_wake_up_cb(struct cfhsi_drv *drv)
|
|
{
|
|
struct cfhsi *cfhsi = NULL;
|
|
|
|
cfhsi = container_of(drv, struct cfhsi, drv);
|
|
dev_dbg(&cfhsi->ndev->dev, "%s.\n",
|
|
__func__);
|
|
|
|
set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
wake_up_interruptible(&cfhsi->wake_up_wait);
|
|
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
|
return;
|
|
|
|
/* Schedule wake up work queue if the peer initiates. */
|
|
if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
|
|
queue_work(cfhsi->wq, &cfhsi->wake_up_work);
|
|
}
|
|
|
|
static void cfhsi_wake_down_cb(struct cfhsi_drv *drv)
|
|
{
|
|
struct cfhsi *cfhsi = NULL;
|
|
|
|
cfhsi = container_of(drv, struct cfhsi, drv);
|
|
dev_dbg(&cfhsi->ndev->dev, "%s.\n",
|
|
__func__);
|
|
|
|
/* Initiating low power is only permitted by the host (us). */
|
|
set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
|
|
wake_up_interruptible(&cfhsi->wake_down_wait);
|
|
}
|
|
|
|
static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct cfhsi *cfhsi = NULL;
|
|
int start_xfer = 0;
|
|
int timer_active;
|
|
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
cfhsi = netdev_priv(dev);
|
|
|
|
spin_lock_bh(&cfhsi->lock);
|
|
|
|
skb_queue_tail(&cfhsi->qhead, skb);
|
|
|
|
/* Sanity check; xmit should not be called after unregister_netdev */
|
|
if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) {
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
cfhsi_abort_tx(cfhsi);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Send flow off if number of packets is above high water mark. */
|
|
if (!cfhsi->flow_off_sent &&
|
|
cfhsi->qhead.qlen > cfhsi->q_high_mark &&
|
|
cfhsi->cfdev.flowctrl) {
|
|
cfhsi->flow_off_sent = 1;
|
|
cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF);
|
|
}
|
|
|
|
if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) {
|
|
cfhsi->tx_state = CFHSI_TX_STATE_XFER;
|
|
start_xfer = 1;
|
|
}
|
|
|
|
if (!start_xfer) {
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
return 0;
|
|
}
|
|
|
|
/* Delete inactivity timer if started. */
|
|
timer_active = del_timer_sync(&cfhsi->timer);
|
|
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
|
|
if (timer_active) {
|
|
struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
|
|
int len;
|
|
int res;
|
|
|
|
/* Create HSI frame. */
|
|
len = cfhsi_tx_frm(desc, cfhsi);
|
|
WARN_ON(!len);
|
|
|
|
/* Set up new transfer. */
|
|
res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
|
|
if (WARN_ON(res < 0)) {
|
|
dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
|
|
__func__, res);
|
|
cfhsi_abort_tx(cfhsi);
|
|
}
|
|
} else {
|
|
/* Schedule wake up work queue if the we initiate. */
|
|
if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
|
|
queue_work(cfhsi->wq, &cfhsi->wake_up_work);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cfhsi_open(struct net_device *dev)
|
|
{
|
|
netif_wake_queue(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cfhsi_close(struct net_device *dev)
|
|
{
|
|
netif_stop_queue(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops cfhsi_ops = {
|
|
.ndo_open = cfhsi_open,
|
|
.ndo_stop = cfhsi_close,
|
|
.ndo_start_xmit = cfhsi_xmit
|
|
};
|
|
|
|
static void cfhsi_setup(struct net_device *dev)
|
|
{
|
|
struct cfhsi *cfhsi = netdev_priv(dev);
|
|
dev->features = 0;
|
|
dev->netdev_ops = &cfhsi_ops;
|
|
dev->type = ARPHRD_CAIF;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
|
dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
|
|
dev->tx_queue_len = 0;
|
|
dev->destructor = free_netdev;
|
|
skb_queue_head_init(&cfhsi->qhead);
|
|
cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
|
|
cfhsi->cfdev.use_frag = false;
|
|
cfhsi->cfdev.use_stx = false;
|
|
cfhsi->cfdev.use_fcs = false;
|
|
cfhsi->ndev = dev;
|
|
}
|
|
|
|
int cfhsi_probe(struct platform_device *pdev)
|
|
{
|
|
struct cfhsi *cfhsi = NULL;
|
|
struct net_device *ndev;
|
|
struct cfhsi_dev *dev;
|
|
int res;
|
|
|
|
ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup);
|
|
if (!ndev)
|
|
return -ENODEV;
|
|
|
|
cfhsi = netdev_priv(ndev);
|
|
cfhsi->ndev = ndev;
|
|
cfhsi->pdev = pdev;
|
|
|
|
/* Initialize state vaiables. */
|
|
cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
|
|
cfhsi->rx_state.state = CFHSI_RX_STATE_DESC;
|
|
|
|
/* Set flow info */
|
|
cfhsi->flow_off_sent = 0;
|
|
cfhsi->q_low_mark = LOW_WATER_MARK;
|
|
cfhsi->q_high_mark = HIGH_WATER_MARK;
|
|
|
|
/* Assign the HSI device. */
|
|
dev = (struct cfhsi_dev *)pdev->dev.platform_data;
|
|
cfhsi->dev = dev;
|
|
|
|
/* Assign the driver to this HSI device. */
|
|
dev->drv = &cfhsi->drv;
|
|
|
|
/*
|
|
* Allocate a TX buffer with the size of a HSI packet descriptors
|
|
* and the necessary room for CAIF payload frames.
|
|
*/
|
|
cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL);
|
|
if (!cfhsi->tx_buf) {
|
|
res = -ENODEV;
|
|
goto err_alloc_tx;
|
|
}
|
|
|
|
/*
|
|
* Allocate a RX buffer with the size of two HSI packet descriptors and
|
|
* the necessary room for CAIF payload frames.
|
|
*/
|
|
cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
|
|
if (!cfhsi->rx_buf) {
|
|
res = -ENODEV;
|
|
goto err_alloc_rx;
|
|
}
|
|
|
|
cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
|
|
if (!cfhsi->rx_flip_buf) {
|
|
res = -ENODEV;
|
|
goto err_alloc_rx_flip;
|
|
}
|
|
|
|
/* Pre-calculate inactivity timeout. */
|
|
if (inactivity_timeout != -1) {
|
|
cfhsi->inactivity_timeout =
|
|
inactivity_timeout * HZ / 1000;
|
|
if (!cfhsi->inactivity_timeout)
|
|
cfhsi->inactivity_timeout = 1;
|
|
else if (cfhsi->inactivity_timeout > NEXT_TIMER_MAX_DELTA)
|
|
cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
|
|
} else {
|
|
cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
|
|
}
|
|
|
|
/* Initialize recieve vaiables. */
|
|
cfhsi->rx_ptr = cfhsi->rx_buf;
|
|
cfhsi->rx_len = CFHSI_DESC_SZ;
|
|
|
|
/* Initialize spin locks. */
|
|
spin_lock_init(&cfhsi->lock);
|
|
|
|
/* Set up the driver. */
|
|
cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb;
|
|
cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb;
|
|
cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb;
|
|
cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb;
|
|
|
|
/* Initialize the work queues. */
|
|
INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up);
|
|
INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down);
|
|
INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync);
|
|
|
|
/* Clear all bit fields. */
|
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
|
clear_bit(CFHSI_AWAKE, &cfhsi->bits);
|
|
|
|
/* Create work thread. */
|
|
cfhsi->wq = create_singlethread_workqueue(pdev->name);
|
|
if (!cfhsi->wq) {
|
|
dev_err(&ndev->dev, "%s: Failed to create work queue.\n",
|
|
__func__);
|
|
res = -ENODEV;
|
|
goto err_create_wq;
|
|
}
|
|
|
|
/* Initialize wait queues. */
|
|
init_waitqueue_head(&cfhsi->wake_up_wait);
|
|
init_waitqueue_head(&cfhsi->wake_down_wait);
|
|
init_waitqueue_head(&cfhsi->flush_fifo_wait);
|
|
|
|
/* Setup the inactivity timer. */
|
|
init_timer(&cfhsi->timer);
|
|
cfhsi->timer.data = (unsigned long)cfhsi;
|
|
cfhsi->timer.function = cfhsi_inactivity_tout;
|
|
/* Setup the slowpath RX timer. */
|
|
init_timer(&cfhsi->rx_slowpath_timer);
|
|
cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi;
|
|
cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath;
|
|
|
|
/* Add CAIF HSI device to list. */
|
|
spin_lock(&cfhsi_list_lock);
|
|
list_add_tail(&cfhsi->list, &cfhsi_list);
|
|
spin_unlock(&cfhsi_list_lock);
|
|
|
|
/* Activate HSI interface. */
|
|
res = cfhsi->dev->cfhsi_up(cfhsi->dev);
|
|
if (res) {
|
|
dev_err(&cfhsi->ndev->dev,
|
|
"%s: can't activate HSI interface: %d.\n",
|
|
__func__, res);
|
|
goto err_activate;
|
|
}
|
|
|
|
/* Flush FIFO */
|
|
res = cfhsi_flush_fifo(cfhsi);
|
|
if (res) {
|
|
dev_err(&ndev->dev, "%s: Can't flush FIFO: %d.\n",
|
|
__func__, res);
|
|
goto err_net_reg;
|
|
}
|
|
|
|
/* Register network device. */
|
|
res = register_netdev(ndev);
|
|
if (res) {
|
|
dev_err(&ndev->dev, "%s: Registration error: %d.\n",
|
|
__func__, res);
|
|
goto err_net_reg;
|
|
}
|
|
|
|
netif_stop_queue(ndev);
|
|
|
|
return res;
|
|
|
|
err_net_reg:
|
|
cfhsi->dev->cfhsi_down(cfhsi->dev);
|
|
err_activate:
|
|
destroy_workqueue(cfhsi->wq);
|
|
err_create_wq:
|
|
kfree(cfhsi->rx_flip_buf);
|
|
err_alloc_rx_flip:
|
|
kfree(cfhsi->rx_buf);
|
|
err_alloc_rx:
|
|
kfree(cfhsi->tx_buf);
|
|
err_alloc_tx:
|
|
free_netdev(ndev);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void cfhsi_shutdown(struct cfhsi *cfhsi)
|
|
{
|
|
u8 *tx_buf, *rx_buf, *flip_buf;
|
|
|
|
/* Stop TXing */
|
|
netif_tx_stop_all_queues(cfhsi->ndev);
|
|
|
|
/* going to shutdown driver */
|
|
set_bit(CFHSI_SHUTDOWN, &cfhsi->bits);
|
|
|
|
/* Flush workqueue */
|
|
flush_workqueue(cfhsi->wq);
|
|
|
|
/* Delete timers if pending */
|
|
del_timer_sync(&cfhsi->timer);
|
|
del_timer_sync(&cfhsi->rx_slowpath_timer);
|
|
|
|
/* Cancel pending RX request (if any) */
|
|
cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev);
|
|
|
|
/* Destroy workqueue */
|
|
destroy_workqueue(cfhsi->wq);
|
|
|
|
/* Store bufferes: will be freed later. */
|
|
tx_buf = cfhsi->tx_buf;
|
|
rx_buf = cfhsi->rx_buf;
|
|
flip_buf = cfhsi->rx_flip_buf;
|
|
/* Flush transmit queues. */
|
|
cfhsi_abort_tx(cfhsi);
|
|
|
|
/* Deactivate interface */
|
|
cfhsi->dev->cfhsi_down(cfhsi->dev);
|
|
|
|
/* Finally unregister the network device. */
|
|
unregister_netdev(cfhsi->ndev);
|
|
|
|
/* Free buffers. */
|
|
kfree(tx_buf);
|
|
kfree(rx_buf);
|
|
kfree(flip_buf);
|
|
}
|
|
|
|
int cfhsi_remove(struct platform_device *pdev)
|
|
{
|
|
struct list_head *list_node;
|
|
struct list_head *n;
|
|
struct cfhsi *cfhsi = NULL;
|
|
struct cfhsi_dev *dev;
|
|
|
|
dev = (struct cfhsi_dev *)pdev->dev.platform_data;
|
|
spin_lock(&cfhsi_list_lock);
|
|
list_for_each_safe(list_node, n, &cfhsi_list) {
|
|
cfhsi = list_entry(list_node, struct cfhsi, list);
|
|
/* Find the corresponding device. */
|
|
if (cfhsi->dev == dev) {
|
|
/* Remove from list. */
|
|
list_del(list_node);
|
|
spin_unlock(&cfhsi_list_lock);
|
|
|
|
/* Shutdown driver. */
|
|
cfhsi_shutdown(cfhsi);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
spin_unlock(&cfhsi_list_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
struct platform_driver cfhsi_plat_drv = {
|
|
.probe = cfhsi_probe,
|
|
.remove = cfhsi_remove,
|
|
.driver = {
|
|
.name = "cfhsi",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static void __exit cfhsi_exit_module(void)
|
|
{
|
|
struct list_head *list_node;
|
|
struct list_head *n;
|
|
struct cfhsi *cfhsi = NULL;
|
|
|
|
spin_lock(&cfhsi_list_lock);
|
|
list_for_each_safe(list_node, n, &cfhsi_list) {
|
|
cfhsi = list_entry(list_node, struct cfhsi, list);
|
|
|
|
/* Remove from list. */
|
|
list_del(list_node);
|
|
spin_unlock(&cfhsi_list_lock);
|
|
|
|
/* Shutdown driver. */
|
|
cfhsi_shutdown(cfhsi);
|
|
|
|
spin_lock(&cfhsi_list_lock);
|
|
}
|
|
spin_unlock(&cfhsi_list_lock);
|
|
|
|
/* Unregister platform driver. */
|
|
platform_driver_unregister(&cfhsi_plat_drv);
|
|
}
|
|
|
|
static int __init cfhsi_init_module(void)
|
|
{
|
|
int result;
|
|
|
|
/* Initialize spin lock. */
|
|
spin_lock_init(&cfhsi_list_lock);
|
|
|
|
/* Register platform driver. */
|
|
result = platform_driver_register(&cfhsi_plat_drv);
|
|
if (result) {
|
|
printk(KERN_ERR "Could not register platform HSI driver: %d.\n",
|
|
result);
|
|
goto err_dev_register;
|
|
}
|
|
|
|
return result;
|
|
|
|
err_dev_register:
|
|
return result;
|
|
}
|
|
|
|
module_init(cfhsi_init_module);
|
|
module_exit(cfhsi_exit_module);
|