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authorSimon Glass <sjg@chromium.org>2015-08-03 08:19:24 -0600
committerSimon Glass <sjg@chromium.org>2015-08-05 21:06:11 -0600
commitf48eaf01b2f7212987166aae970b895c7e215466 (patch)
treebd88667c12601647c556c16d91cfd52b0c576850 /drivers/misc
parentcc456bd7df06225819258dec9d4a5047e8da4952 (diff)
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cros_ec: Support the LDO access method used by spring
Add a driver to support the special LDO access used by spring. This is a custom method in the cros_ec protocol - it does not use an I2C pass-through. There are two implementation choices: 1. Write a special LDO driver which can talk across the EC. Duplicate all the logic from TPS65090 for retrying when the LDO fails to come up. 2. Write a special I2C bus driver which pretends to be a TPS65090 and transfers reads and writes using the LDO message. Either is distasteful. The latter method is chosen since it results in less code duplication and a fairly simple (30-line) implementation of the core logic. The crosec 'ldo' subcommand could be removed (since i2c md/mw will work instead) but is retained as a convenience. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/cros_ec.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index ae52561..6027177 100644
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -931,31 +931,32 @@ int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block)
return 0;
}
-int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state)
+int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state)
{
+ struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
struct ec_params_ldo_set params;
params.index = index;
params.state = state;
- if (ec_command_inptr(dev, EC_CMD_LDO_SET, 0,
- &params, sizeof(params),
- NULL, 0))
+ if (ec_command_inptr(cdev, EC_CMD_LDO_SET, 0, &params, sizeof(params),
+ NULL, 0))
return -1;
return 0;
}
-int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state)
+int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state)
{
+ struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
struct ec_params_ldo_get params;
struct ec_response_ldo_get *resp;
params.index = index;
- if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0,
- &params, sizeof(params),
- (uint8_t **)&resp, sizeof(*resp)) != sizeof(*resp))
+ if (ec_command_inptr(cdev, EC_CMD_LDO_GET, 0, &params, sizeof(params),
+ (uint8_t **)&resp, sizeof(*resp)) !=
+ sizeof(*resp))
return -1;
*state = resp->state;
@@ -1681,9 +1682,9 @@ static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
state = simple_strtoul(argv[3], &endp, 10);
if (*argv[3] == 0 || *endp != 0)
return CMD_RET_USAGE;
- ret = cros_ec_set_ldo(dev, index, state);
+ ret = cros_ec_set_ldo(udev, index, state);
} else {
- ret = cros_ec_get_ldo(dev, index, &state);
+ ret = cros_ec_get_ldo(udev, index, &state);
if (!ret) {
printf("LDO%d: %s\n", index,
state == EC_LDO_STATE_ON ?