// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 BayLibre SAS
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
//
// Core MFD driver for MAXIM 77650/77651 charger/power-supply.
// Programming manual: https://pdfserv.maximintegrated.com/en/an/AN6428.pdf
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77650.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#define MAX77650_INT_GPI_F_MSK BIT(0)
#define MAX77650_INT_GPI_R_MSK BIT(1)
#define MAX77650_INT_GPI_MSK \
(MAX77650_INT_GPI_F_MSK | MAX77650_INT_GPI_R_MSK)
#define MAX77650_INT_nEN_F_MSK BIT(2)
#define MAX77650_INT_nEN_R_MSK BIT(3)
#define MAX77650_INT_TJAL1_R_MSK BIT(4)
#define MAX77650_INT_TJAL2_R_MSK BIT(5)
#define MAX77650_INT_DOD_R_MSK BIT(6)
#define MAX77650_INT_THM_MSK BIT(0)
#define MAX77650_INT_CHG_MSK BIT(1)
#define MAX77650_INT_CHGIN_MSK BIT(2)
#define MAX77650_INT_TJ_REG_MSK BIT(3)
#define MAX77650_INT_CHGIN_CTRL_MSK BIT(4)
#define MAX77650_INT_SYS_CTRL_MSK BIT(5)
#define MAX77650_INT_SYS_CNFG_MSK BIT(6)
#define MAX77650_INT_GLBL_OFFSET 0
#define MAX77650_INT_CHG_OFFSET 1
#define MAX77650_SBIA_LPM_MASK BIT(5)
#define MAX77650_SBIA_LPM_DISABLED 0x00
enum {
MAX77650_INT_GPI,
MAX77650_INT_nEN_F,
MAX77650_INT_nEN_R,
MAX77650_INT_TJAL1_R,
MAX77650_INT_TJAL2_R,
MAX77650_INT_DOD_R,
MAX77650_INT_THM,
MAX77650_INT_CHG,
MAX77650_INT_CHGIN,
MAX77650_INT_TJ_REG,
MAX77650_INT_CHGIN_CTRL,
MAX77650_INT_SYS_CTRL,
MAX77650_INT_SYS_CNFG,
};
static const struct resource max77650_charger_resources[] = {
DEFINE_RES_IRQ_NAMED(MAX77650_INT_CHG, "CHG"),
DEFINE_RES_IRQ_NAMED(MAX77650_INT_CHGIN, "CHGIN"),
};
static const struct resource max77650_gpio_resources[] = {
DEFINE_RES_IRQ_NAMED(MAX77650_INT_GPI, "GPI"),
};
static const struct resource max77650_onkey_resources[] = {
DEFINE_RES_IRQ_NAMED(MAX77650_INT_nEN_F, "nEN_F"),
DEFINE_RES_IRQ_NAMED(MAX77650_INT_nEN_R, "nEN_R"),
};
static const struct mfd_cell max77650_cells[] = {
{
.name = "max77650-regulator",
.of_compatible = "maxim,max77650-regulator",
}, {
.name = "max77650-charger",
.of_compatible = "maxim,max77650-charger",
.resources = max77650_charger_resources,
.num_resources = ARRAY_SIZE(max77650_charger_resources),
}, {
.name = "max77650-gpio",
.of_compatible = "maxim,max77650-gpio",
.resources = max77650_gpio_resources,
.num_resources = ARRAY_SIZE(max77650_gpio_resources),
}, {
.name = "max77650-led",
.of_compatible = "maxim,max77650-led",
}, {
.name = "max77650-onkey",
.of_compatible = "maxim,max77650-onkey",
.resources = max77650_onkey_resources,
.num_resources = ARRAY_SIZE(max77650_onkey_resources),
},
};
static const struct regmap_irq max77650_irqs[] = {
[MAX77650_INT_GPI] = {
.reg_offset = MAX77650_INT_GLBL_OFFSET,
.mask = MAX77650_INT_GPI_MSK,
.type = {
.type_falling_val = MAX77650_INT_GPI_F_MSK,
.type_rising_val = MAX77650_INT_GPI_R_MSK,
.types_supported = IRQ_TYPE_EDGE_BOTH,
},
},
REGMAP_IRQ_REG(MAX77650_INT_nEN_F,
MAX77650_INT_GLBL_OFFSET, MAX77650_INT_nEN_F_MSK),
REGMAP_IRQ_REG(MAX77650_INT_nEN_R,
MAX77650_INT_GLBL_OFFSET, MAX77650_INT_nEN_R_MSK),
REGMAP_IRQ_REG(MAX77650_INT_TJAL1_R,
MAX77650_INT_GLBL_OFFSET, MAX77650_INT_TJAL1_R_MSK),
REGMAP_IRQ_REG(MAX77650_INT_TJAL2_R,
MAX77650_INT_GLBL_OFFSET, MAX77650_INT_TJAL2_R_MSK),
REGMAP_IRQ_REG(MAX77650_INT_DOD_R,
MAX77650_INT_GLBL_OFFSET, MAX77650_INT_DOD_R_MSK),
REGMAP_IRQ_REG(MAX77650_INT_THM,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_THM_MSK),
REGMAP_IRQ_REG(MAX77650_INT_CHG,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHG_MSK),
REGMAP_IRQ_REG(MAX77650_INT_CHGIN,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHGIN_MSK),
REGMAP_IRQ_REG(MAX77650_INT_TJ_REG,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_TJ_REG_MSK),
REGMAP_IRQ_REG(MAX77650_INT_CHGIN_CTRL,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHGIN_CTRL_MSK),
REGMAP_IRQ_REG(MAX77650_INT_SYS_CTRL,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_SYS_CTRL_MSK),
REGMAP_IRQ_REG(MAX77650_INT_SYS_CNFG,
MAX77650_INT_CHG_OFFSET, MAX77650_INT_SYS_CNFG_MSK),
};
static const struct regmap_irq_chip max77650_irq_chip = {
.name = "max77650-irq",
.irqs = max77650_irqs,
.num_irqs = ARRAY_SIZE(max77650_irqs),
.num_regs = 2,
.status_base = MAX77650_REG_INT_GLBL,
.mask_base = MAX77650_REG_INTM_GLBL,
.type_in_mask = true,
.init_ack_masked = true,
.clear_on_unmask = true,
};
static const struct regmap_config max77650_regmap_config = {
.name = "max77650",
.reg_bits = 8,
.val_bits = 8,
};
static int max77650_i2c_probe(struct i2c_client *i2c)
{
struct regmap_irq_chip_data *irq_data;
struct device *dev = &i2c->dev;
struct irq_domain *domain;
struct regmap *map;
unsigned int val;
int rv, id;
map = devm_regmap_init_i2c(i2c, &max77650_regmap_config);
if (IS_ERR(map)) {
dev_err(dev, "Unable to initialise I2C Regmap\n");
return PTR_ERR(map);
}
rv = regmap_read(map, MAX77650_REG_CID, &val);
if (rv) {
dev_err(dev, "Unable to read Chip ID\n");
return rv;
}
id = MAX77650_CID_BITS(val);
switch (id) {
case MAX77650_CID_77650A:
case MAX77650_CID_77650C:
case MAX77650_CID_77651A:
case MAX77650_CID_77651B:
break;
default:
dev_err(dev, "Chip not supported - ID: 0x%02x\n", id);
return -ENODEV;
}
/*
* This IC has a low-power mode which reduces the quiescent current
* consumption to ~5.6uA but is only suitable for systems consuming
* less than ~2mA. Since this is not likely the case even on
* linux-based wearables - keep the chip in normal power mode.
*/
rv = regmap_update_bits(map,
MAX77650_REG_CNFG_GLBL,
MAX77650_SBIA_LPM_MASK,
MAX77650_SBIA_LPM_DISABLED);
if (rv) {
dev_err(dev, "Unable to change the power mode\n");
return rv;
}
rv = devm_regmap_add_irq_chip(dev, map, i2c->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77650_irq_chip, &irq_data);
if (rv) {
dev_err(dev, "Unable to add Regmap IRQ chip\n");
return rv;
}
domain = regmap_irq_get_domain(irq_data);
return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
max77650_cells, ARRAY_SIZE(max77650_cells),
NULL, 0, domain);
}
static const struct of_device_id max77650_of_match[] = {
{ .compatible = "maxim,max77650" },
{ }
};
MODULE_DEVICE_TABLE(of, max77650_of_match);
static struct i2c_driver max77650_i2c_driver = {
.driver = {
.name = "max77650",
.of_match_table = max77650_of_match,
},
.probe = max77650_i2c_probe,
};
module_i2c_driver(max77650_i2c_driver);
MODULE_DESCRIPTION("MAXIM 77650/77651 multi-function core driver");
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
MODULE_LICENSE("GPL v2");
