u-boot/include/power/pmic.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2014-2015 Samsung Electronics
* Przemyslaw Marczak <p.marczak@samsung.com>
*
* Copyright (C) 2011-2012 Samsung Electronics
* Lukasz Majewski <l.majewski@samsung.com>
*/
#ifndef __CORE_PMIC_H_
#define __CORE_PMIC_H_
#include <dm/ofnode.h>
#include <i2c.h>
#include <linux/list.h>
#include <power/power_chrg.h>
enum { PMIC_I2C, PMIC_SPI, PMIC_NONE};
/* TODO: Change to !CONFIG_IS_ENABLED(DM_PMIC) when SPL_DM_PMIC exists */
#if CONFIG_IS_ENABLED(POWER_LEGACY)
enum { I2C_PMIC, I2C_NUM, };
enum { PMIC_READ, PMIC_WRITE, };
enum { PMIC_SENSOR_BYTE_ORDER_LITTLE, PMIC_SENSOR_BYTE_ORDER_BIG, };
enum {
PMIC_CHARGER_DISABLE,
PMIC_CHARGER_ENABLE,
};
struct p_i2c {
unsigned char addr;
unsigned char *buf;
unsigned char tx_num;
};
struct p_spi {
unsigned int cs;
unsigned int mode;
unsigned int bitlen;
unsigned int clk;
unsigned int flags;
u32 (*prepare_tx)(u32 reg, u32 *val, u32 write);
};
struct pmic;
struct power_fg {
int (*fg_battery_check) (struct pmic *p, struct pmic *bat);
int (*fg_battery_update) (struct pmic *p, struct pmic *bat);
};
struct power_chrg {
int (*chrg_type) (struct pmic *p);
int (*chrg_bat_present) (struct pmic *p);
int (*chrg_state) (struct pmic *p, int state, int current);
};
struct power_battery {
struct battery *bat;
int (*battery_init) (struct pmic *bat, struct pmic *p1,
struct pmic *p2, struct pmic *p3);
int (*battery_charge) (struct pmic *bat);
/* Keep info about power devices involved with battery operation */
struct pmic *chrg, *fg, *muic;
};
struct pmic {
const char *name;
unsigned char bus;
unsigned char interface;
unsigned char sensor_byte_order;
unsigned int number_of_regs;
union hw {
struct p_i2c i2c;
struct p_spi spi;
} hw;
void (*low_power_mode) (void);
struct power_battery *pbat;
struct power_chrg *chrg;
struct power_fg *fg;
struct pmic *parent;
struct list_head list;
};
#endif /* CONFIG_IS_ENABLED(POWER_LEGACY) */
/* TODO: Change to CONFIG_IS_ENABLED(DM_PMIC) when SPL_DM_PMIC exists */
#ifdef CONFIG_DM_PMIC
/**
* U-Boot PMIC Framework
* =====================
*
* UCLASS_PMIC - This is designed to provide an I/O interface for PMIC devices.
*
* For the multi-function PMIC devices, this can be used as parent I/O device
* for each IC's interface. Then, each child uses its parent for read/write.
*
* The driver model tree could look like this:
*
*_ root device
* |_ BUS 0 device (e.g. I2C0) - UCLASS_I2C/SPI/...
* | |_ PMIC device (READ/WRITE ops) - UCLASS_PMIC
* | |_ REGULATOR device (ldo/buck/... ops) - UCLASS_REGULATOR
* | |_ CHARGER device (charger ops) - UCLASS_CHARGER (in the future)
* | |_ MUIC device (microUSB connector ops) - UCLASS_MUIC (in the future)
* | |_ ...
* |
* |_ BUS 1 device (e.g. I2C1) - UCLASS_I2C/SPI/...
* |_ PMIC device (READ/WRITE ops) - UCLASS_PMIC
* |_ RTC device (rtc ops) - UCLASS_RTC (in the future)
*
* We can find two PMIC cases in boards design:
* - single I/O interface
* - multiple I/O interfaces
* We bind a single PMIC device for each interface, to provide an I/O for
* its child devices. And each child usually implements a different function,
* controlled by the same interface.
*
* The binding should be done automatically. If device tree nodes/subnodes are
* proper defined, then:
*
* |_ the ROOT driver will bind the device for I2C/SPI node:
* |_ the I2C/SPI driver should bind a device for pmic node:
* |_ the PMIC driver should bind devices for its childs:
* |_ regulator (child)
* |_ charger (child)
* |_ other (child)
*
* The same for other device nodes, for multi-interface PMIC.
*
* Note:
* Each PMIC interface driver should use a different compatible string.
*
* If a PMIC child device driver needs access the PMIC-specific registers,
* it need know only the register address and the access can be done through
* the parent pmic driver. Like in the example:
*
*_ root driver
* |_ dev: bus I2C0 - UCLASS_I2C
* | |_ dev: my_pmic (read/write) (is parent) - UCLASS_PMIC
* | |_ dev: my_regulator (set value/etc..) (is child) - UCLASS_REGULATOR
*
* To ensure such device relationship, the pmic device driver should also bind
* all its child devices, like in the example below. It can be done by calling
* the 'pmic_bind_children()' - please refer to the function description, which
* can be found in this header file. This function, should be called inside the
* driver's bind() method.
*
* For the example driver, please refer the MAX77686 driver:
* - 'drivers/power/pmic/max77686.c'
*/
/**
* struct dm_pmic_ops - PMIC device I/O interface
*
* Should be implemented by UCLASS_PMIC device drivers. The standard
* device operations provides the I/O interface for it's childs.
*
* @reg_count: device's register count
* @read: read 'len' bytes at "reg" and store it into the 'buffer'
* @write: write 'len' bytes from the 'buffer' to the register at 'reg' address
*/
struct dm_pmic_ops {
int (*reg_count)(struct udevice *dev);
int (*read)(struct udevice *dev, uint reg, uint8_t *buffer, int len);
int (*write)(struct udevice *dev, uint reg, const uint8_t *buffer,
int len);
};
/**
* enum pmic_op_type - used for various pmic devices operation calls,
* for reduce a number of lines with the same code for read/write or get/set.
*
* @PMIC_OP_GET - get operation
* @PMIC_OP_SET - set operation
*/
enum pmic_op_type {
PMIC_OP_GET,
PMIC_OP_SET,
};
/**
* struct pmic_child_info - basic device's child info for bind child nodes with
* the driver by the node name prefix and driver name. This is a helper struct
* for function: pmic_bind_children().
*
* @prefix - child node name prefix (or its name if is unique or single)
* @driver - driver name for the sub-node with prefix
*/
struct pmic_child_info {
const char *prefix;
const char *driver;
};
/* drivers/power/pmic-uclass.c */
/**
* pmic_bind_children() - bind drivers for given parent pmic, using child info
* found in 'child_info' array.
*
* @pmic - pmic device - the parent of found child's
* @child_info - N-childs info array
* Return: a positive number of childs, or 0 if no child found (error)
*
* Note: For N-childs the child_info array should have N+1 entries and the last
* entry prefix should be NULL - the same as for drivers compatible.
*
* For example, a single prefix info (N=1):
* static const struct pmic_child_info bind_info[] = {
* { .prefix = "ldo", .driver = "ldo_driver" },
* { },
* };
*
* This function is useful for regulator sub-nodes:
* my_regulator@0xa {
* reg = <0xa>;
* (pmic - bind automatically by compatible)
* compatible = "my_pmic";
* ...
* (pmic's childs - bind by pmic_bind_children())
* (nodes prefix: "ldo", driver: "my_regulator_ldo")
* ldo1 { ... };
* ldo2 { ... };
*
* (nodes prefix: "buck", driver: "my_regulator_buck")
* buck1 { ... };
* buck2 { ... };
* };
*/
int pmic_bind_children(struct udevice *pmic, ofnode parent,
const struct pmic_child_info *child_info);
/**
* pmic_get: get the pmic device using its name
*
* @name - device name
* @devp - returned pointer to the pmic device
* Return: 0 on success or negative value of errno.
*
* The returned devp device can be used with pmic_read/write calls
*/
int pmic_get(const char *name, struct udevice **devp);
/**
* pmic_reg_count: get the pmic register count
*
* The required pmic device can be obtained by 'pmic_get()'
*
* @dev - pointer to the UCLASS_PMIC device
* Return: register count value on success or negative value of errno.
*/
int pmic_reg_count(struct udevice *dev);
/**
* pmic_read/write: read/write to the UCLASS_PMIC device
*
* The required pmic device can be obtained by 'pmic_get()'
*
* @pmic - pointer to the UCLASS_PMIC device
* @reg - device register offset
* @buffer - pointer to read/write buffer
* @len - byte count for read/write
* Return: 0 on success or negative value of errno.
*/
int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len);
int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len);
/**
* pmic_reg_read() - read a PMIC register value
*
* @dev: PMIC device to read
* @reg: Register to read
* Return: value read on success or negative value of errno.
*/
int pmic_reg_read(struct udevice *dev, uint reg);
/**
* pmic_reg_write() - write a PMIC register value
*
* @dev: PMIC device to write
* @reg: Register to write
* @value: Value to write
* Return: 0 on success or negative value of errno.
*/
int pmic_reg_write(struct udevice *dev, uint reg, uint value);
/**
* pmic_clrsetbits() - clear and set bits in a PMIC register
*
* This reads a register, optionally clears some bits, optionally sets some
* bits, then writes the register.
*
* @dev: PMIC device to update
* @reg: Register to update
* @clr: Bit mask to clear (set those bits that you want cleared)
* @set: Bit mask to set (set those bits that you want set)
* Return: 0 on success or negative value of errno.
*/
int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set);
/*
* This structure holds the private data for PMIC uclass
* For now we store information about the number of bytes
* being sent at once to the device.
*/
struct uc_pmic_priv {
uint trans_len;
};
#endif /* DM_PMIC */
/* TODO: Change to CONFIG_IS_ENABLED(DM_PMIC) when SPL_DM_PMIC exists */
#if CONFIG_IS_ENABLED(POWER_LEGACY)
/* Legacy API, do not use */
int pmic_init(unsigned char bus);
int power_init_board(void);
int pmic_dialog_init(unsigned char bus);
int check_reg(struct pmic *p, u32 reg);
struct pmic *pmic_alloc(void);
struct pmic *pmic_get(const char *s);
int pmic_probe(struct pmic *p);
int pmic_reg_read(struct pmic *p, u32 reg, u32 *val);
int pmic_reg_write(struct pmic *p, u32 reg, u32 val);
int pmic_set_output(struct pmic *p, u32 reg, int ldo, int on);
#endif /* CONFIG_IS_ENABLED(POWER_LEGACY) */
#define pmic_i2c_addr (p->hw.i2c.addr)
#define pmic_i2c_tx_num (p->hw.i2c.tx_num)
#define pmic_spi_bitlen (p->hw.spi.bitlen)
#define pmic_spi_flags (p->hw.spi.flags)
#endif /* __CORE_PMIC_H_ */