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staging: typec: tcpm: Respond to Discover Identity commands

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If the lower level driver provided a list of VDOs in its configuration
data, send it to the partner as response to a Discover Identity command
if in device mode (UFP).

Cc: Yueyao Zhu <yueyao.zhu@gmail.com>
Originally-from: Puma Hsu <puma_hsu@htc.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guenter Roeck 2017-05-09 09:04:58 -07:00 committed by Greg Kroah-Hartman
parent 931693f973
commit 193a68011f
3 changed files with 33 additions and 1 deletions
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4
drivers/staging/typec/pd_vdo.h
View File

@ -22,6 +22,9 @@
* VDM object is minimum of VDM header + 6 additional data objects.
*/
#define VDO_MAX_OBJECTS 6
#define VDO_MAX_SIZE (VDO_MAX_OBJECTS + 1)
/*
* VDM header
* ----------
@ -34,7 +37,6 @@
* <5> :: reserved (SVDM), command type (UVDM)
* <4:0> :: command
*/
#define VDO_MAX_SIZE 7
#define VDO(vid, type, custom) \
(((vid) << 16) | \
((type) << 15) | \

27
drivers/staging/typec/tcpm.c
View File

@ -252,6 +252,8 @@ struct tcpm_port {
unsigned int nr_src_pdo;
u32 snk_pdo[PDO_MAX_OBJECTS];
unsigned int nr_snk_pdo;
u32 snk_vdo[VDO_MAX_OBJECTS];
unsigned int nr_snk_vdo;
unsigned int max_snk_mv;
unsigned int max_snk_ma;
@ -998,6 +1000,7 @@ static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
struct pd_mode_data *modep;
int rlen = 0;
u16 svid;
int i;
tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
p0, cmd_type, cmd, cnt);
@ -1008,6 +1011,14 @@ static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
case CMDT_INIT:
switch (cmd) {
case CMD_DISCOVER_IDENT:
/* 6.4.4.3.1: Only respond as UFP (device) */
if (port->data_role == TYPEC_DEVICE &&
port->nr_snk_vdo) {
for (i = 0; i < port->nr_snk_vdo; i++)
response[i + 1]
= cpu_to_le32(port->snk_vdo[i]);
rlen = port->nr_snk_vdo + 1;
}
break;
case CMD_DISCOVER_SVID:
break;
@ -3320,6 +3331,20 @@ static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
return nr_pdo;
}
static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
unsigned int nr_vdo)
{
unsigned int i;
if (nr_vdo > VDO_MAX_OBJECTS)
nr_vdo = VDO_MAX_OBJECTS;
for (i = 0; i < nr_vdo; i++)
dest_vdo[i] = src_vdo[i];
return nr_vdo;
}
void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
unsigned int nr_pdo)
{
@ -3410,6 +3435,8 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
tcpc->config->nr_src_pdo);
port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo,
tcpc->config->nr_snk_pdo);
port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo,
tcpc->config->nr_snk_vdo);
port->max_snk_mv = tcpc->config->max_snk_mv;
port->max_snk_ma = tcpc->config->max_snk_ma;

3
drivers/staging/typec/tcpm.h
View File

@ -60,6 +60,9 @@ struct tcpc_config {
const u32 *snk_pdo;
unsigned int nr_snk_pdo;
const u32 *snk_vdo;
unsigned int nr_snk_vdo;
unsigned int max_snk_mv;
unsigned int max_snk_ma;
unsigned int max_snk_mw;