diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/typec/tps6598x.c | 53 |
1 files changed, 49 insertions, 4 deletions
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c index 1c0033ad8738..9947c87d2a1e 100644 --- a/drivers/usb/typec/tps6598x.c +++ b/drivers/usb/typec/tps6598x.c @@ -14,6 +14,8 @@ #include <linux/usb/typec.h> /* Register offsets */ +#define TPS_REG_VID 0x00 +#define TPS_REG_MODE 0x03 #define TPS_REG_CMD1 0x08 #define TPS_REG_DATA1 0x09 #define TPS_REG_INT_EVENT1 0x14 @@ -66,6 +68,20 @@ struct tps6598x_rx_identity_reg { #define TPS_TASK_TIMEOUT 1 #define TPS_TASK_REJECTED 3 +enum { + TPS_MODE_APP, + TPS_MODE_BOOT, + TPS_MODE_BIST, + TPS_MODE_DISC, +}; + +static const char *const modes[] = { + [TPS_MODE_APP] = "APP ", + [TPS_MODE_BOOT] = "BOOT", + [TPS_MODE_BIST] = "BIST", + [TPS_MODE_DISC] = "DISC", +}; + /* Unrecognized commands will be replaced with "!CMD" */ #define INVALID_CMD(_cmd_) (_cmd_ == 0x444d4321) @@ -384,6 +400,32 @@ err_unlock: return IRQ_HANDLED; } +static int tps6598x_check_mode(struct tps6598x *tps) +{ + char mode[5] = { }; + int ret; + + ret = tps6598x_read32(tps, TPS_REG_MODE, (void *)mode); + if (ret) + return ret; + + switch (match_string(modes, ARRAY_SIZE(modes), mode)) { + case TPS_MODE_APP: + return 0; + case TPS_MODE_BOOT: + dev_warn(tps->dev, "dead-battery condition\n"); + return 0; + case TPS_MODE_BIST: + case TPS_MODE_DISC: + default: + dev_err(tps->dev, "controller in unsupported mode \"%s\"\n", + mode); + break; + } + + return -ENODEV; +} + static const struct regmap_config tps6598x_regmap_config = { .reg_bits = 8, .val_bits = 8, @@ -409,10 +451,8 @@ static int tps6598x_probe(struct i2c_client *client) if (IS_ERR(tps->regmap)) return PTR_ERR(tps->regmap); - ret = tps6598x_read32(tps, 0, &vid); - if (ret < 0) - return ret; - if (!vid) + ret = tps6598x_read32(tps, TPS_REG_VID, &vid); + if (ret < 0 || !vid) return -ENODEV; /* @@ -425,6 +465,11 @@ static int tps6598x_probe(struct i2c_client *client) if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) tps->i2c_protocol = true; + /* Make sure the controller has application firmware running */ + ret = tps6598x_check_mode(tps); + if (ret) + return ret; + ret = tps6598x_read32(tps, TPS_REG_STATUS, &status); if (ret < 0) return ret; |