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

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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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