diff options
| author | Moritz Fischer <moritz.fischer@ettus.com> | 2017-01-12 09:47:30 -0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-02-08 06:07:13 -0700 |
| commit | e9b25f2ea1ef24a648f07feeb3604888bdca43e0 (patch) | |
| tree | 74fc5cc863b33283478d19f2299a223c5bfa365c /drivers/misc | |
| parent | 136026f18ed7bdfadc1af1696eced2b13af003d7 (diff) | |
cros_ec: i2c: Group i2c write / read into single transaction
Replace dm_i2c_write() / dm_i2c_read() with transaction using
struct i2c_msg[2] in order to allow for i2c controller to detect
write/read cycle to emit a repeated start condition.
Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: u-boot@lists.denx.de
Acked-by: Simon Glass <sjg@chromium.org>
Tested on snow:
Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/cros_ec_i2c.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/misc/cros_ec_i2c.c b/drivers/misc/cros_ec_i2c.c index 3de18b2d2a..f2f6961499 100644 --- a/drivers/misc/cros_ec_i2c.c +++ b/drivers/misc/cros_ec_i2c.c @@ -29,6 +29,8 @@ static int cros_ec_i2c_command(struct udevice *udev, uint8_t cmd, int dout_len, uint8_t **dinp, int din_len) { struct cros_ec_dev *dev = dev_get_uclass_priv(udev); + struct dm_i2c_chip *chip = dev_get_parent_platdata(udev); + struct i2c_msg i2c_msg[2]; /* version8, cmd8, arglen8, out8[dout_len], csum8 */ int out_bytes = dout_len + 4; /* response8, arglen8, in8[din_len], checksum8 */ @@ -53,6 +55,11 @@ static int cros_ec_i2c_command(struct udevice *udev, uint8_t cmd, assert(dout_len >= 0); assert(dinp); + i2c_msg[0].addr = chip->chip_addr; + i2c_msg[0].len = out_bytes; + i2c_msg[0].buf = dev->dout; + i2c_msg[0].flags = 0; + /* * Copy command and data into output buffer so we can do a single I2C * burst transaction. @@ -85,24 +92,21 @@ static int cros_ec_i2c_command(struct udevice *udev, uint8_t cmd, *ptr++ = (uint8_t) cros_ec_calc_checksum(dev->dout, dout_len + 3); + i2c_msg[1].addr = chip->chip_addr; + i2c_msg[1].len = in_bytes; + i2c_msg[1].buf = in_ptr; + i2c_msg[1].flags = I2C_M_RD; + /* Send output data */ cros_ec_dump_data("out", -1, dev->dout, out_bytes); - ret = dm_i2c_write(udev, 0, dev->dout, out_bytes); + + ret = dm_i2c_xfer(udev, &i2c_msg[0], 2); if (ret) { - debug("%s: Cannot complete I2C write to %s\n", __func__, + debug("%s: Could not execute transfer to %s\n", __func__, udev->name); ret = -1; } - if (!ret) { - ret = dm_i2c_read(udev, 0, in_ptr, in_bytes); - if (ret) { - debug("%s: Cannot complete I2C read from %s\n", - __func__, udev->name); - ret = -1; - } - } - if (*in_ptr != EC_RES_SUCCESS) { debug("%s: Received bad result code %d\n", __func__, *in_ptr); return -(int)*in_ptr; |