From 029dfff30cc468b3e21c2004a135d3380a8c20e6 Mon Sep 17 00:00:00 2001 From: Nico Huber Date: Wed, 12 Jul 2017 17:59:16 +0200 Subject: i2c: Move to Linux like `struct i2c_msg` MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Our current struct for I2C segments `i2c_seg` was close to being compa- tible to the Linux version `i2c_msg`, close to being compatible to SMBus and close to being readable (e.g. what was `chip` supposed to mean?) but turned out to be hard to fix. Instead of extending it in a backwards compatible way (and not touching current controller drivers), replace it with a Linux source compatible `struct i2c_msg` and patch all the drivers and users with Coccinelle. The new `struct i2c_msg` should ease porting drivers from Linux and help to write SMBus compatible controller drivers. Beside integer type changes, the field `read` is replaced with a generic field `flags` and `chip` is renamed to `slave`. Patched with Coccinelle using the clumsy spatch below and some manual changes: * Nested struct initializers and one field access skipped by Coccinelle. * Removed assumption in the code that I2C_M_RD is 1. * In `i2c.h`, changed all occurences of `chip` to `slave`. @@ @@ -struct i2c_seg +struct i2c_msg @@ identifier msg; expression e; @@ ( struct i2c_msg msg = { - .read = 0, + .flags = 0, }; | struct i2c_msg msg = { - .read = 1, + .flags = I2C_M_RD, }; | struct i2c_msg msg = { - .chip = e, + .slave = e, }; ) @@ struct i2c_msg msg; statement S1, S2; @@ ( -if (msg.read) +if (msg.flags & I2C_M_RD) S1 else S2 | -if (msg.read) +if (msg.flags & I2C_M_RD) S1 ) @@ struct i2c_msg *msg; statement S1, S2; @@ ( -if (msg->read) +if (msg->flags & I2C_M_RD) S1 else S2 | -if (msg->read) +if (msg->flags & I2C_M_RD) S1 ) @@ struct i2c_msg msg; expression e; @@ ( -msg.read = 0; +msg.flags = 0; | -msg.read = 1; +msg.flags = I2C_M_RD; | -msg.read = e; +msg.flags = e ? I2C_M_RD : 0; | -!!(msg.read) +(msg.flags & I2C_M_RD) | -(msg.read) +(msg.flags & I2C_M_RD) ) @@ struct i2c_msg *msg; expression e; @@ ( -msg->read = 0; +msg->flags = 0; | -msg->read = 1; +msg->flags = I2C_M_RD; | -msg->read = e; +msg->flags = e ? I2C_M_RD : 0; | -!!(msg->read) +(msg->flags & I2C_M_RD) | -(msg->read) +(msg->flags & I2C_M_RD) ) @@ struct i2c_msg msg; @@ -msg.chip +msg.slave @@ struct i2c_msg *msg; expression e; @@ -msg[e].chip +msg[e].slave @ slave disable ptr_to_array @ struct i2c_msg *msg; @@ -msg->chip +msg->slave Change-Id: Ifd7cabf0a18ffd7a1def25d1d7059b713d0b7ea9 Signed-off-by: Nico Huber Reviewed-on: https://review.coreboot.org/20542 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Werner Zeh Reviewed-by: Kyösti Mälkki Reviewed-by: Paul Menzel --- src/cpu/allwinner/a10/twi.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'src/cpu') diff --git a/src/cpu/allwinner/a10/twi.c b/src/cpu/allwinner/a10/twi.c index 3ef5606d27..123d34ec05 100644 --- a/src/cpu/allwinner/a10/twi.c +++ b/src/cpu/allwinner/a10/twi.c @@ -185,10 +185,10 @@ static int i2c_write(struct a1x_twi *twi, uint8_t chip, return len; } -int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) +int platform_i2c_transfer(unsigned bus, struct i2c_msg *segments, int count) { int i, ret = CB_SUCCESS; - struct i2c_seg *seg = segments; + struct i2c_msg *seg = segments; struct a1x_twi *twi = (void *)TWI_BASE(bus); @@ -198,12 +198,12 @@ int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) for (i = 0; i < count; i++) { seg = segments + i; - if (seg->read) { - ret = i2c_read(twi, seg->chip, seg->buf, seg->len); + if (seg->flags & I2C_M_RD) { + ret = i2c_read(twi, seg->slave, seg->buf, seg->len); if (ret < 0) break; } else { - ret = i2c_write(twi, seg->chip, seg->buf, seg->len); + ret = i2c_write(twi, seg->slave, seg->buf, seg->len); if (ret < 0) break; } -- cgit v1.2.3