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Message-Id: <1404339655-8456-10-git-send-email-alex.aring@gmail.com>
Date: Thu, 3 Jul 2014 00:20:51 +0200
From: Alexander Aring <alex.aring@...il.com>
To: alex.bluesman.smirnov@...il.com
Cc: dbaryshkov@...il.com, linux-zigbee-devel@...ts.sourceforge.net,
netdev@...r.kernel.org, stilwellt@...nlabs.co,
Alexander Aring <alex.aring@...il.com>
Subject: [PATCH v3 net-next 09/13] at86rf230: rework state change and start/stop
This patch removes the current synchron state change function and add a
new function for a state assert. Change the start and stop callbacks to
use this new synchron state change behaviour. It's a wrapper around the
async state change function.
Signed-off-by: Alexander Aring <alex.aring@...il.com>
---
drivers/net/ieee802154/at86rf230.c | 126 ++++++++++++++++++++-----------------
1 file changed, 67 insertions(+), 59 deletions(-)
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 46db6f8..265fea8 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -42,6 +42,8 @@ struct at86rf230_local;
* All timings are in us.
*/
struct at86rf2xx_chip_data {
+ u16 t_off_to_aack;
+ u16 t_off_to_tx_on;
u16 t_frame;
u16 t_p_ack;
/* short interframe spacing time */
@@ -77,6 +79,9 @@ struct at86rf230_local {
struct at86rf2xx_chip_data *data;
struct regmap *regmap;
+ struct completion state_complete;
+ struct at86rf230_state_change state;
+
struct at86rf230_state_change irq;
bool tx_aret;
@@ -547,6 +552,19 @@ at86rf230_async_state_delay(void *context)
}
switch (ctx->from_state) {
+ case STATE_TRX_OFF:
+ switch (ctx->to_state) {
+ case STATE_RX_AACK_ON:
+ usleep_range(c->t_off_to_aack, c->t_off_to_aack + 10);
+ goto change;
+ case STATE_TX_ON:
+ usleep_range(c->t_off_to_tx_on,
+ c->t_off_to_tx_on + 10);
+ goto change;
+ default:
+ break;
+ }
+ break;
case STATE_BUSY_RX_AACK:
switch (ctx->to_state) {
case STATE_TX_ON:
@@ -632,6 +650,39 @@ at86rf230_async_state_change(struct at86rf230_local *lp,
}
static void
+at86rf230_sync_state_change_complete(void *context)
+{
+ struct at86rf230_state_change *ctx = context;
+ struct at86rf230_local *lp = ctx->lp;
+
+ complete(&lp->state_complete);
+}
+
+/* This function do a sync framework above the async state change.
+ * Some callbacks of the IEEE 802.15.4 driver interface need to be
+ * handled synchronously.
+ */
+static int
+at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
+{
+ int rc;
+
+ rc = at86rf230_async_state_change(lp, &lp->state, state,
+ at86rf230_sync_state_change_complete);
+ if (rc) {
+ at86rf230_async_error(lp, &lp->state, rc);
+ return rc;
+ }
+
+ rc = wait_for_completion_timeout(&lp->state_complete,
+ msecs_to_jiffies(100));
+ if (!rc)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static void
at86rf230_tx_complete(void *context)
{
struct at86rf230_state_change *ctx = context;
@@ -957,72 +1008,15 @@ at86rf230_ed(struct ieee802154_dev *dev, u8 *level)
}
static int
-at86rf230_state(struct ieee802154_dev *dev, int state)
-{
- struct at86rf230_local *lp = dev->priv;
- int rc;
- unsigned int val;
- u8 desired_status;
-
- might_sleep();
-
- if (state == STATE_FORCE_TX_ON)
- desired_status = STATE_TX_ON;
- else if (state == STATE_FORCE_TRX_OFF)
- desired_status = STATE_TRX_OFF;
- else
- desired_status = state;
-
- do {
- rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &val);
- if (rc)
- goto err;
- } while (val == STATE_TRANSITION_IN_PROGRESS);
-
- if (val == desired_status)
- return 0;
-
- /* state is equal to phy states */
- rc = at86rf230_write_subreg(lp, SR_TRX_CMD, state);
- if (rc)
- goto err;
-
- do {
- rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &val);
- if (rc)
- goto err;
- } while (val == STATE_TRANSITION_IN_PROGRESS);
-
-
- if (val == desired_status ||
- (desired_status == STATE_RX_ON && val == STATE_BUSY_RX) ||
- (desired_status == STATE_RX_AACK_ON && val == STATE_BUSY_RX_AACK))
- return 0;
-
- pr_err("unexpected state change: %d, asked for %d\n", val, state);
- return -EBUSY;
-
-err:
- pr_err("error: %d\n", rc);
- return rc;
-}
-
-static int
at86rf230_start(struct ieee802154_dev *dev)
{
- u8 rc;
-
- rc = at86rf230_state(dev, STATE_TX_ON);
- if (rc)
- return rc;
-
- return at86rf230_state(dev, STATE_RX_AACK_ON);
+ return at86rf230_sync_state_change(dev->priv, STATE_RX_AACK_ON);
}
static void
at86rf230_stop(struct ieee802154_dev *dev)
{
- at86rf230_state(dev, STATE_FORCE_TRX_OFF);
+ at86rf230_sync_state_change(dev->priv, STATE_FORCE_TRX_OFF);
}
static int
@@ -1242,6 +1236,8 @@ static struct ieee802154_ops at86rf230_ops = {
};
static struct at86rf2xx_chip_data at86rf233_data = {
+ .t_off_to_aack = 80,
+ .t_off_to_tx_on = 80,
.t_frame = 4096,
.t_p_ack = 545,
.t_sifs = 192,
@@ -1253,6 +1249,8 @@ static struct at86rf2xx_chip_data at86rf233_data = {
};
static struct at86rf2xx_chip_data at86rf231_data = {
+ .t_off_to_aack = 110,
+ .t_off_to_tx_on = 110,
.t_frame = 4096,
.t_p_ack = 545,
.t_sifs = 192,
@@ -1264,6 +1262,8 @@ static struct at86rf2xx_chip_data at86rf231_data = {
};
static struct at86rf2xx_chip_data at86rf212_data = {
+ .t_off_to_aack = 200,
+ .t_off_to_tx_on = 200,
.t_frame = 4096,
.t_p_ack = 545,
.t_sifs = 192,
@@ -1427,6 +1427,13 @@ at86rf230_detect_device(struct at86rf230_local *lp)
static void
at86rf230_setup_spi_messages(struct at86rf230_local *lp)
{
+ lp->state.lp = lp;
+ spi_message_init(&lp->state.msg);
+ lp->state.msg.context = &lp->state;
+ lp->state.trx.tx_buf = lp->state.buf;
+ lp->state.trx.rx_buf = lp->state.buf;
+ spi_message_add_tail(&lp->state.trx, &lp->state.msg);
+
lp->irq.lp = lp;
spi_message_init(&lp->irq.msg);
lp->irq.msg.context = &lp->irq;
@@ -1509,6 +1516,7 @@ static int at86rf230_probe(struct spi_device *spi)
spin_lock_init(&lp->lock);
init_completion(&lp->tx_complete);
+ init_completion(&lp->state_complete);
spi_set_drvdata(spi, lp);
--
2.0.1
--
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