diff options
Diffstat (limited to 'drivers/usb/typec/tcpm.c')
-rw-r--r-- | drivers/usb/typec/tcpm.c | 293 |
1 files changed, 242 insertions, 51 deletions
diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c index c166fc77dfb8..f4d563ee7690 100644 --- a/drivers/usb/typec/tcpm.c +++ b/drivers/usb/typec/tcpm.c @@ -252,6 +252,9 @@ struct tcpm_port { unsigned int nr_src_pdo; u32 snk_pdo[PDO_MAX_OBJECTS]; unsigned int nr_snk_pdo; + unsigned int nr_fixed; /* number of fixed sink PDOs */ + unsigned int nr_var; /* number of variable sink PDOs */ + unsigned int nr_batt; /* number of battery sink PDOs */ u32 snk_vdo[VDO_MAX_OBJECTS]; unsigned int nr_snk_vdo; @@ -1247,6 +1250,100 @@ static void vdm_state_machine_work(struct work_struct *work) mutex_unlock(&port->lock); } +enum pdo_err { + PDO_NO_ERR, + PDO_ERR_NO_VSAFE5V, + PDO_ERR_VSAFE5V_NOT_FIRST, + PDO_ERR_PDO_TYPE_NOT_IN_ORDER, + PDO_ERR_FIXED_NOT_SORTED, + PDO_ERR_VARIABLE_BATT_NOT_SORTED, + PDO_ERR_DUPE_PDO, +}; + +static const char * const pdo_err_msg[] = { + [PDO_ERR_NO_VSAFE5V] = + " err: source/sink caps should atleast have vSafe5V", + [PDO_ERR_VSAFE5V_NOT_FIRST] = + " err: vSafe5V Fixed Supply Object Shall always be the first object", + [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] = + " err: PDOs should be in the following order: Fixed; Battery; Variable", + [PDO_ERR_FIXED_NOT_SORTED] = + " err: Fixed supply pdos should be in increasing order of their fixed voltage", + [PDO_ERR_VARIABLE_BATT_NOT_SORTED] = + " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage", + [PDO_ERR_DUPE_PDO] = + " err: Variable/Batt supply pdos cannot have same min/max voltage", +}; + +static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo, + unsigned int nr_pdo) +{ + unsigned int i; + + /* Should at least contain vSafe5v */ + if (nr_pdo < 1) + return PDO_ERR_NO_VSAFE5V; + + /* The vSafe5V Fixed Supply Object Shall always be the first object */ + if (pdo_type(pdo[0]) != PDO_TYPE_FIXED || + pdo_fixed_voltage(pdo[0]) != VSAFE5V) + return PDO_ERR_VSAFE5V_NOT_FIRST; + + for (i = 1; i < nr_pdo; i++) { + if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) { + return PDO_ERR_PDO_TYPE_NOT_IN_ORDER; + } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) { + enum pd_pdo_type type = pdo_type(pdo[i]); + + switch (type) { + /* + * The remaining Fixed Supply Objects, if + * present, shall be sent in voltage order; + * lowest to highest. + */ + case PDO_TYPE_FIXED: + if (pdo_fixed_voltage(pdo[i]) <= + pdo_fixed_voltage(pdo[i - 1])) + return PDO_ERR_FIXED_NOT_SORTED; + break; + /* + * The Battery Supply Objects and Variable + * supply, if present shall be sent in Minimum + * Voltage order; lowest to highest. + */ + case PDO_TYPE_VAR: + case PDO_TYPE_BATT: + if (pdo_min_voltage(pdo[i]) < + pdo_min_voltage(pdo[i - 1])) + return PDO_ERR_VARIABLE_BATT_NOT_SORTED; + else if ((pdo_min_voltage(pdo[i]) == + pdo_min_voltage(pdo[i - 1])) && + (pdo_max_voltage(pdo[i]) == + pdo_min_voltage(pdo[i - 1]))) + return PDO_ERR_DUPE_PDO; + break; + default: + tcpm_log_force(port, " Unknown pdo type"); + } + } + } + + return PDO_NO_ERR; +} + +static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo, + unsigned int nr_pdo) +{ + enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo); + + if (err_index != PDO_NO_ERR) { + tcpm_log_force(port, " %s", pdo_err_msg[err_index]); + return -EINVAL; + } + + return 0; +} + /* * PD (data, control) command handling functions */ @@ -1269,6 +1366,9 @@ static void tcpm_pd_data_request(struct tcpm_port *port, tcpm_log_source_caps(port); + tcpm_validate_caps(port, port->source_caps, + port->nr_source_caps); + /* * This message may be received even if VBUS is not * present. This is quite unexpected; see USB PD @@ -1670,39 +1770,90 @@ static int tcpm_pd_check_request(struct tcpm_port *port) return 0; } -static int tcpm_pd_select_pdo(struct tcpm_port *port) +#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y)) +#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y)) + +static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo, + int *src_pdo) { - unsigned int i, max_mw = 0, max_mv = 0; + unsigned int i, j, max_mw = 0, max_mv = 0, mw = 0, mv = 0, ma = 0; int ret = -EINVAL; /* - * Select the source PDO providing the most power while staying within - * the board's voltage limits. Prefer PDO providing exp + * Select the source PDO providing the most power which has a + * matchig sink cap. */ for (i = 0; i < port->nr_source_caps; i++) { u32 pdo = port->source_caps[i]; enum pd_pdo_type type = pdo_type(pdo); - unsigned int mv, ma, mw; - - if (type == PDO_TYPE_FIXED) - mv = pdo_fixed_voltage(pdo); - else - mv = pdo_min_voltage(pdo); - - if (type == PDO_TYPE_BATT) { - mw = pdo_max_power(pdo); - } else { - ma = min(pdo_max_current(pdo), - port->max_snk_ma); - mw = ma * mv / 1000; - } - /* Perfer higher voltages if available */ - if ((mw > max_mw || (mw == max_mw && mv > max_mv)) && - mv <= port->max_snk_mv) { - ret = i; - max_mw = mw; - max_mv = mv; + if (type == PDO_TYPE_FIXED) { + for (j = 0; j < port->nr_fixed; j++) { + if (pdo_fixed_voltage(pdo) == + pdo_fixed_voltage(port->snk_pdo[j])) { + ma = min_current(pdo, port->snk_pdo[j]); + mv = pdo_fixed_voltage(pdo); + mw = ma * mv / 1000; + if (mw > max_mw || + (mw == max_mw && mv > max_mv)) { + ret = 0; + *src_pdo = i; + *sink_pdo = j; + max_mw = mw; + max_mv = mv; + } + /* There could only be one fixed pdo + * at a specific voltage level. + * So breaking here. + */ + break; + } + } + } else if (type == PDO_TYPE_BATT) { + for (j = port->nr_fixed; + j < port->nr_fixed + + port->nr_batt; + j++) { + if (pdo_min_voltage(pdo) >= + pdo_min_voltage(port->snk_pdo[j]) && + pdo_max_voltage(pdo) <= + pdo_max_voltage(port->snk_pdo[j])) { + mw = min_power(pdo, port->snk_pdo[j]); + mv = pdo_min_voltage(pdo); + if (mw > max_mw || + (mw == max_mw && mv > max_mv)) { + ret = 0; + *src_pdo = i; + *sink_pdo = j; + max_mw = mw; + max_mv = mv; + } + } + } + } else if (type == PDO_TYPE_VAR) { + for (j = port->nr_fixed + + port->nr_batt; + j < port->nr_fixed + + port->nr_batt + + port->nr_var; + j++) { + if (pdo_min_voltage(pdo) >= + pdo_min_voltage(port->snk_pdo[j]) && + pdo_max_voltage(pdo) <= + pdo_max_voltage(port->snk_pdo[j])) { + ma = min_current(pdo, port->snk_pdo[j]); + mv = pdo_min_voltage(pdo); + mw = ma * mv / 1000; + if (mw > max_mw || + (mw == max_mw && mv > max_mv)) { + ret = 0; + *src_pdo = i; + *sink_pdo = j; + max_mw = mw; + max_mv = mv; + } + } + } } } @@ -1714,13 +1865,14 @@ static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo) unsigned int mv, ma, mw, flags; unsigned int max_ma, max_mw; enum pd_pdo_type type; - int index; - u32 pdo; + int src_pdo_index, snk_pdo_index; + u32 pdo, matching_snk_pdo; - index = tcpm_pd_select_pdo(port); - if (index < 0) + if (tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index) < 0) return -EINVAL; - pdo = port->source_caps[index]; + + pdo = port->source_caps[src_pdo_index]; + matching_snk_pdo = port->snk_pdo[snk_pdo_index]; type = pdo_type(pdo); if (type == PDO_TYPE_FIXED) @@ -1728,26 +1880,28 @@ static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo) else mv = pdo_min_voltage(pdo); - /* Select maximum available current within the board's power limit */ + /* Select maximum available current within the sink pdo's limit */ if (type == PDO_TYPE_BATT) { - mw = pdo_max_power(pdo); - ma = 1000 * min(mw, port->max_snk_mw) / mv; + mw = min_power(pdo, matching_snk_pdo); + ma = 1000 * mw / mv; } else { - ma = min(pdo_max_current(pdo), - 1000 * port->max_snk_mw / mv); + ma = min_current(pdo, matching_snk_pdo); + mw = ma * mv / 1000; } - ma = min(ma, port->max_snk_ma); flags = RDO_USB_COMM | RDO_NO_SUSPEND; /* Set mismatch bit if offered power is less than operating power */ - mw = ma * mv / 1000; max_ma = ma; max_mw = mw; if (mw < port->operating_snk_mw) { flags |= RDO_CAP_MISMATCH; - max_mw = port->operating_snk_mw; - max_ma = max_mw * 1000 / mv; + if (type == PDO_TYPE_BATT && + (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo))) + max_mw = pdo_max_power(matching_snk_pdo); + else if (pdo_max_current(matching_snk_pdo) > + pdo_max_current(pdo)) + max_ma = pdo_max_current(matching_snk_pdo); } tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d", @@ -1756,16 +1910,16 @@ static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo) port->polarity); if (type == PDO_TYPE_BATT) { - *rdo = RDO_BATT(index + 1, mw, max_mw, flags); + *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags); tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s", - index, mv, mw, + src_pdo_index, mv, mw, flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); } else { - *rdo = RDO_FIXED(index + 1, ma, max_ma, flags); + *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags); tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s", - index, mv, ma, + src_pdo_index, mv, ma, flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); } @@ -3435,9 +3589,12 @@ static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo, return nr_vdo; } -void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo, - unsigned int nr_pdo) +int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo, + unsigned int nr_pdo) { + if (tcpm_validate_caps(port, pdo, nr_pdo)) + return -EINVAL; + mutex_lock(&port->lock); port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo); switch (port->state) { @@ -3457,16 +3614,20 @@ void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo, break; } mutex_unlock(&port->lock); + return 0; } EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities); -void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo, - unsigned int nr_pdo, - unsigned int max_snk_mv, - unsigned int max_snk_ma, - unsigned int max_snk_mw, - unsigned int operating_snk_mw) +int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo, + unsigned int nr_pdo, + unsigned int max_snk_mv, + unsigned int max_snk_ma, + unsigned int max_snk_mw, + unsigned int operating_snk_mw) { + if (tcpm_validate_caps(port, pdo, nr_pdo)) + return -EINVAL; + mutex_lock(&port->lock); port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo); port->max_snk_mv = max_snk_mv; @@ -3485,9 +3646,23 @@ void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo, break; } mutex_unlock(&port->lock); + return 0; } EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities); +static int nr_type_pdos(const u32 *pdo, unsigned int nr_pdo, + enum pd_pdo_type type) +{ + int count = 0; + int i; + + for (i = 0; i < nr_pdo; i++) { + if (pdo_type(pdo[i]) == type) + count++; + } + return count; +} + struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) { struct tcpm_port *port; @@ -3520,11 +3695,28 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) init_completion(&port->tx_complete); init_completion(&port->swap_complete); + tcpm_debugfs_init(port); + if (tcpm_validate_caps(port, tcpc->config->src_pdo, + tcpc->config->nr_src_pdo) || + tcpm_validate_caps(port, tcpc->config->snk_pdo, + tcpc->config->nr_snk_pdo)) { + err = -EINVAL; + goto out_destroy_wq; + } port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo, 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_fixed = nr_type_pdos(port->snk_pdo, + port->nr_snk_pdo, + PDO_TYPE_FIXED); + port->nr_var = nr_type_pdos(port->snk_pdo, + port->nr_snk_pdo, + PDO_TYPE_VAR); + port->nr_batt = nr_type_pdos(port->snk_pdo, + port->nr_snk_pdo, + PDO_TYPE_BATT); port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo, tcpc->config->nr_snk_vdo); @@ -3575,7 +3767,6 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) } } - tcpm_debugfs_init(port); mutex_lock(&port->lock); tcpm_init(port); mutex_unlock(&port->lock); |