Re: [PATCH 1/6] mfd: max77843: Add max77843 MFD driver core driver

From: Krzysztof Kozlowski
Date: Fri Jan 23 2015 - 01:32:39 EST

2015-01-23 6:02 GMT+01:00 Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>:
> This patch adds MAX77843 core/irq driver to support PMIC,
> MUIC(Micro USB Interface Controller), Charger, Fuel Gauge,
> LED and Haptic device.
>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> Signed-off-by: Beomho Seo <beomho.seo@xxxxxxxxxxx>
> Signed-off-by: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>
> ---
> drivers/mfd/Kconfig | 14 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/max77843.c | 241 ++++++++++++++++++++
> include/linux/mfd/max77843-private.h | 410 ++++++++++++++++++++++++++++++++++
> 4 files changed, 666 insertions(+)
> create mode 100644 drivers/mfd/max77843.c
> create mode 100644 include/linux/mfd/max77843-private.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 2e6b731..0c67c79 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -442,6 +442,20 @@ config MFD_MAX77693
> additional drivers must be enabled in order to use the functionality
> of the device.
>
> +config MFD_MAX77843
> + bool "Maxim Semiconductor MAX77843 PMIC Support"
> + depends on I2C=y
> + select MFD_CORE
> + select REGMAP_I2C
> + select REGMAP_IRQ
> + help
> + Say yes here to add support for Maxim Semiconductor MAX77843.
> + This is companion Power Management IC with LEDs, Haptic, Charger,
> + Fuel Gauge, MUIC(Micro USB Interface Controller) controls on chip.
> + This driver provides common support for accessing the device;
> + additional drivers must be enabled in order to use the functionality
> + of the device.
> +
> config MFD_MAX8907
> tristate "Maxim Semiconductor MAX8907 PMIC Support"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 53467e2..fe4f75c 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -117,6 +117,7 @@ obj-$(CONFIG_MFD_DA9063) += da9063.o
> obj-$(CONFIG_MFD_MAX14577) += max14577.o
> obj-$(CONFIG_MFD_MAX77686) += max77686.o
> obj-$(CONFIG_MFD_MAX77693) += max77693.o
> +obj-$(CONFIG_MFD_MAX77843) += max77843.o
> obj-$(CONFIG_MFD_MAX8907) += max8907.o
> max8925-objs := max8925-core.o max8925-i2c.o
> obj-$(CONFIG_MFD_MAX8925) += max8925.o
> diff --git a/drivers/mfd/max77843.c b/drivers/mfd/max77843.c
> new file mode 100644
> index 0000000..d7f8b76
> --- /dev/null
> +++ b/drivers/mfd/max77843.c
> @@ -0,0 +1,241 @@
> +/*
> + * max77843.c - MFD core driver for the Maxim MAX77843
> + *
> + * Copyright (C) 2014 Samsung Electrnoics
> + * Author: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/max77843-private.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +
> +static const struct mfd_cell max77843_devs[] = {
> + {
> + .name = "max77843-muic",
> + .of_compatible = "maxim,max77843-muic",
> + }, {
> + .name = "max77843-regulator",
> + .of_compatible = "maxim,max77843-regulator",
> + }, {
> + .name = "max77843-charger",
> + .of_compatible = "maxim,max77843-charger"
> + }, {
> + .name = "max77843-fuelgauge",
> + .of_compatible = "maxim,max77843-fuelgauge",
> + },
> +};
> +
> +static const struct regmap_config max77843_charger_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = MAX77843_CHG_REG_END,
> +};
> +
> +static const struct regmap_config max77843_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = MAX77843_SYS_REG_END,
> +};
> +
> +static const struct regmap_irq max77843_irqs[] = {
> + /* TOPSYS interrupts */
> + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
> + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
> + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
> + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
> +};
> +
> +static const struct regmap_irq_chip max77843_irq_chip = {
> + .name = "max77843",
> + .status_base = MAX77843_SYS_REG_SYSINTSRC,
> + .mask_base = MAX77843_SYS_REG_SYSINTMASK,
> + .mask_invert = false,
> + .num_regs = 1,
> + .irqs = max77843_irqs,
> + .num_irqs = ARRAY_SIZE(max77843_irqs),
> +};
> +
> +static int max77843_chg_init(struct max77843 *max77843)
> +{

Could this function be moved to the charger driver? This way the
driver will manage its own resources instead of depending on parent
MFD driver.

> + int ret;
> +
> + max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG);
> + if (!max77843->i2c_chg) {
> + dev_err(&max77843->i2c->dev,
> + "Cannot allocate I2C device for Charger\n");
> + return PTR_ERR(max77843->i2c_chg);
> + }
> + i2c_set_clientdata(max77843->i2c_chg, max77843);
> +
> + max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
> + &max77843_charger_regmap_config);
> + if (IS_ERR(max77843->regmap_chg)) {
> + ret = PTR_ERR(max77843->regmap_chg);
> + goto err_chg_i2c;
> + }
> +
> + return 0;
> +
> +err_chg_i2c:
> + i2c_unregister_device(max77843->i2c_chg);
> +
> + return ret;
> +}
> +
> +static int max77843_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct max77843 *max77843;
> + int ret;
> + unsigned int reg_data;
> +
> + max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
> + if (!max77843)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, max77843);
> + max77843->dev = &i2c->dev;
> + max77843->i2c = i2c;
> + max77843->irq = i2c->irq;
> +
> + max77843->regmap = devm_regmap_init_i2c(i2c,
> + &max77843_regmap_config);
> + if (IS_ERR(max77843->regmap)) {
> + dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
> + return PTR_ERR(max77843->regmap);
> + }
> +
> + ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
> + IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
> + 0, &max77843_irq_chip, &max77843->irq_data);

Why shared IRQ?

> + if (ret) {
> + dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
> + return ret;
> + }
> +
> + ret = regmap_read(max77843->regmap,
> + MAX77843_SYS_REG_PMICID, &reg_data);
> + if (ret < 0) {
> + dev_err(&i2c->dev, "Failed to read PMIC ID\n");
> + goto err_pmic_id;
> + }
> + dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
> +
> + ret = max77843_chg_init(max77843);
> + if (ret) {
> + dev_err(&i2c->dev, "Failed to init Charger\n");
> + goto err_pmic_id;
> + }
> +
> + ret = regmap_update_bits(max77843->regmap,
> + MAX77843_SYS_REG_INTSRCMASK,
> + MAX77843_INTSRC_MASK_MASK,
> + (unsigned int)~MAX77843_INTSRC_MASK_MASK);
> + if (ret < 0) {
> + dev_err(&i2c->dev, "Failed to unmask interrupt sourece\n");

s/sourece/source/

Best regards,
Krzysztof
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