path: root/drivers/usb/typec/rt1719.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/usb/pd.h>
#include <linux/usb/role.h>
#include <linux/usb/typec.h>

#define RT1719_REG_TXCTRL1	0x03
#define RT1719_REG_TXCTRL2	0x04
#define RT1719_REG_POLICYINFO	0x0E
#define RT1719_REG_SRCPDO1	0x11
#define RT1719_REG_MASKS	0x2D
#define RT1719_REG_EVENTS	0x33
#define RT1719_REG_STATS	0x37
#define RT1719_REG_PSELINFO	0x3C
#define RT1719_REG_USBSETINFO	0x3E
#define RT1719_REG_VENID	0x82

#define RT1719_UNIQUE_PID	0x1719
#define RT1719_REQDRSWAP_MASK	BIT(7)
#define RT1719_EVALMODE_MASK	BIT(4)
#define RT1719_REQSRCPDO_MASK	GENMASK(2, 0)
#define RT1719_TXSPDOREQ_MASK	BIT(7)
#define RT1719_INT_DRSW_ACCEPT	BIT(23)
#define RT1719_INT_RX_SRCCAP	BIT(21)
#define RT1719_INT_VBUS_DCT	BIT(6)
#define RT1719_INT_VBUS_PRESENT	BIT(5)
#define RT1719_INT_PE_SNK_RDY	BIT(2)
#define RT1719_CC1_STAT		GENMASK(9, 8)
#define RT1719_CC2_STAT		GENMASK(11, 10)
#define RT1719_POLARITY_MASK	BIT(23)
#define RT1719_DATAROLE_MASK	BIT(22)
#define RT1719_PDSPECREV_MASK	GENMASK(21, 20)
#define RT1719_SPDOSEL_MASK	GENMASK(18, 16)
#define RT1719_SPDONUM_MASK	GENMASK(15, 13)
#define RT1719_ATTACH_VBUS	BIT(12)
#define RT1719_ATTACH_DBG	BIT(10)
#define RT1719_ATTACH_SNK	BIT(9)
#define RT1719_ATTACHDEV_MASK	(RT1719_ATTACH_VBUS | RT1719_ATTACH_DBG | \
				 RT1719_ATTACH_SNK)
#define RT1719_PE_EXP_CONTRACT	BIT(2)
#define RT1719_PSEL_SUPPORT	BIT(15)
#define RT1719_TBLSEL_MASK	BIT(6)
#define RT1719_LATPSEL_MASK	GENMASK(5, 0)
#define RT1719_USBINFO_MASK	GENMASK(1, 0)
#define RT1719_USB_DFPUFP	3
#define RT1719_MAX_SRCPDO	7

enum {
	SNK_PWR_OPEN = 0,
	SNK_PWR_DEF,
	SNK_PWR_1P5A,
	SNK_PWR_3A
};

enum {
	USBPD_SPECREV_1_0 = 0,
	USBPD_SPECREV_2_0,
	USBPD_SPECREV_3_0
};

enum rt1719_snkcap {
	RT1719_SNKCAP_5V = 0,
	RT1719_SNKCAP_9V,
	RT1719_SNKCAP_12V,
	RT1719_SNKCAP_15V,
	RT1719_SNKCAP_20V,
	RT1719_MAX_SNKCAP
};

struct rt1719_psel_cap {
	u8 lomask;
	u8 himask;
	u32 milliwatt;
	u32 milliamp;
};

struct rt1719_data {
	struct device *dev;
	struct regmap *regmap;
	struct typec_port *port;
	struct usb_role_switch *role_sw;
	struct power_supply *psy;
	struct typec_partner *partner;
	struct power_supply_desc psy_desc;
	struct usb_pd_identity partner_ident;
	struct typec_partner_desc partner_desc;
	struct completion req_completion;
	enum power_supply_usb_type usb_type;
	bool attached;
	bool pd_capable;
	bool drswap_support;
	u32 voltage;
	u32 req_voltage;
	u32 max_current;
	u32 op_current;
	u32 spdos[RT1719_MAX_SRCPDO];
	u16 snkcaps[RT1719_MAX_SNKCAP];
	int spdo_num;
	int spdo_sel;
	u32 conn_info;
	u16 conn_stat;
};

static const enum power_supply_property rt1719_psy_properties[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_USB_TYPE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	POWER_SUPPLY_PROP_CURRENT_NOW
};

static int rt1719_read16(struct rt1719_data *data, unsigned int reg, u16 *val)
{
	__le16 regval;
	int ret;

	ret = regmap_raw_read(data->regmap, reg, &regval, sizeof(regval));
	if (ret)
		return ret;

	*val = le16_to_cpu(regval);
	return 0;
}

static int rt1719_read32(struct rt1719_data *data, unsigned int reg, u32 *val)
{
	__le32 regval;
	int ret;

	ret = regmap_raw_read(data->regmap, reg, &regval, sizeof(regval));
	if (ret)
		return ret;

	*val = le32_to_cpu(regval);
	return 0;
}

static int rt1719_write32(struct rt1719_data *data, unsigned int reg, u32 val)
{
	__le32 regval = cpu_to_le32(val);

	return regmap_raw_write(data->regmap, reg, &regval, sizeof(regval));
}

static enum typec_pwr_opmode rt1719_get_pwr_opmode(u32 conn, u16 stat)
{
	u16 cc1, cc2, cc_stat;

	cc1 = FIELD_GET(RT1719_CC1_STAT, stat);
	cc2 = FIELD_GET(RT1719_CC2_STAT, stat);

	if (conn & RT1719_ATTACH_SNK) {
		if (conn & RT1719_POLARITY_MASK)
			cc_stat = cc2;
		else
			cc_stat = cc1;

		switch (cc_stat) {
		case SNK_PWR_3A:
			return TYPEC_PWR_MODE_3_0A;
		case SNK_PWR_1P5A:
			return TYPEC_PWR_MODE_1_5A;
		}
	} else if (conn & RT1719_ATTACH_DBG) {
		if ((cc1 == SNK_PWR_1P5A && cc2 == SNK_PWR_DEF) ||
		    (cc1 == SNK_PWR_DEF && cc2 == SNK_PWR_1P5A))
			return TYPEC_PWR_MODE_1_5A;
		else if ((cc1 == SNK_PWR_3A && cc2 == SNK_PWR_DEF) ||
			 (cc1 == SNK_PWR_DEF && cc2 == SNK_PWR_3A))
			return TYPEC_PWR_MODE_3_0A;
	}

	return TYPEC_PWR_MODE_USB;
}

static enum typec_data_role rt1719_get_data_role(u32 conn)
{
	if (conn & RT1719_DATAROLE_MASK