linux/drivers/mfd/stw481x.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Core driver for STw4810/STw4811
 *
 * Copyright (C) 2013 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <[email protected]>
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/mfd/stw481x.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spinlock.h>
#include <linux/slab.h>

/*
 * This driver can only access the non-USB portions of STw4811, the register
 * range 0x00-0x10 dealing with USB is bound to the two special I2C pins used
 * for USB control.
 */

/* Registers inside the power control address space */
#define STW_PC_VCORE_SEL …
#define STW_PC_VAUX_SEL …
#define STW_PC_VPLL_SEL …

/**
 * stw481x_get_pctl_reg() - get a power control register
 * @stw481x: handle to the stw481x chip
 * @reg: power control register to fetch
 *
 * The power control registers is a set of one-time-programmable registers
 * in its own register space, accessed by writing addess bits to these
 * two registers: bits 7,6,5 of PCTL_REG_LO corresponds to the 3 LSBs of
 * the address and bits 8,9 of PCTL_REG_HI corresponds to the 2 MSBs of
 * the address, forming an address space of 5 bits, i.e. 32 registers
 * 0x00 ... 0x1f can be obtained.
 */
static int stw481x_get_pctl_reg(struct stw481x *stw481x, u8 reg)
{ … }

static int stw481x_startup(struct stw481x *stw481x)
{ … }

/*
 * MFD cells - we have one cell which is selected operation
 * mode, and we always have a GPIO cell.
 */
static struct mfd_cell stw481x_cells[] = …;

static const struct regmap_config stw481x_regmap_config = …;

static int stw481x_probe(struct i2c_client *client)
{ … }

/*
 * This ID table is completely unused, as this is a pure
 * device-tree probed driver, but it has to be here due to
 * the structure of the I2C core.
 */
static const struct i2c_device_id stw481x_id[] = …;
MODULE_DEVICE_TABLE(i2c, stw481x_id);

static const struct of_device_id stw481x_match[] = …;
MODULE_DEVICE_TABLE(of, stw481x_match);

static struct i2c_driver stw481x_driver = …;

module_i2c_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;