From: petr.cvek@tul•cz (Petr Cvek)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] Add support for SCCB devices into PXA27x I2C controller
Date: Sat, 22 Nov 2014 23:52:07 +0100 [thread overview]
Message-ID: <54711397.9060601@tul.cz> (raw)
Add support for SCCB devices into PXA27x I2C controller.
Fix generated START but no STOP for message without I2C_M_NOSTART flag.
Add support for I2C_M_IGNORE_NAK flag.
Signed-off-by: Petr Cvek <petr.cvek@tul•cz>
---
drivers/i2c/busses/i2c-pxa.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index be671f7..adad044 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -885,7 +885,14 @@ static void i2c_pxa_irq_txempty(struct pxa_i2c
*i2c, u32 isr)
return; /* ignore */
}
- if (isr & ISR_BED) {
+ /*
+ * Ignore NAK when flag I2C_M_IGNORE_NAK is present,
+ * this enables use of SCCB devices
+ */
+ if ((isr & ISR_BED) &&
+ (!((i2c->msg->flags & I2C_M_IGNORE_NAK) &&
+ (isr & ISR_ACKNAK)))) {
+
int ret = BUS_ERROR;
/*
@@ -919,12 +926,15 @@ static void i2c_pxa_irq_txempty(struct pxa_i2c
*i2c, u32 isr)
icr |= ICR_ALDIE | ICR_TB;
/*
- * If this is the last byte of the last message, send
- * a STOP.
+ * If this is the last byte of the last message or last byte
+ * or any message without I2C_M_NOSTART, send a STOP.
*/
- if (i2c->msg_ptr == i2c->msg->len &&
- i2c->msg_idx == i2c->msg_num - 1)
- icr |= ICR_STOP;
+ if (((i2c->msg_ptr == i2c->msg->len) &&
+ (!(i2c->msg->flags & I2C_M_NOSTART))) ||
+ ((i2c->msg_ptr == i2c->msg->len) &&
+ (i2c->msg_idx == i2c->msg_num - 1)))
+ icr |= ICR_STOP;
+
} else if (i2c->msg_idx < i2c->msg_num - 1) {
/*
* Next segment of the message.
--
1.7.12.1
next reply other threads:[~2014-11-22 22:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-22 22:52 Petr Cvek [this message]
2014-11-23 8:31 ` [PATCH] Add support for SCCB devices into PXA27x I2C controller Wolfram Sang
2014-11-23 22:21 ` [PATCH v2] " Petr Cvek
2014-11-24 17:27 ` Wolfram Sang
2014-11-25 5:05 ` [PATCH v3] i2c-pxa: add support for SCCB devices Petr Cvek
2014-11-25 14:26 ` Wolfram Sang
2014-11-23 16:23 ` [PATCH] Add support for SCCB devices into PXA27x I2C controller Sergei Shtylyov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=54711397.9060601@tul.cz \
--to=petr.cvek@tul$(echo .)cz \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox