[PATCH 1/3] mfd: axp20x: Add mfd driver for axp20x PMIC

Maxime Ripard
2014-02-10T20:02:32Z

On Sat, Feb 08, 2014 at 05:03:46PM +0100, Carlo Caione wrote:
> This patch introduces the preliminary support for PMICs X-Powers AXP202
> and AXP209. The core contains support only for two sub-modules (PEK
> and regulators) that will be added with two different patch-sets.
>
> Signed-off-by: Carlo Caione <carlo@caione.org>
> ---
> drivers/mfd/Kconfig | 12 +++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/axp20x.c | 251 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/axp20x.h | 178 ++++++++++++++++++++++++++++++++
> 4 files changed, 442 insertions(+)
> create mode 100644 drivers/mfd/axp20x.c
> create mode 100644 include/linux/mfd/axp20x.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index dd67158..33d38c4 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -59,6 +59,18 @@ config MFD_AAT2870_CORE
> additional drivers must be enabled in order to use the
> functionality of the device.
>
> +config MFD_AXP20X
> + bool "X-Powers AXP20X"
> + select MFD_CORE
> + select REGMAP_I2C
> + select REGMAP_IRQ
> + depends on I2C=y
> + help
> + If you say Y here you get support for the AXP20X.
> + 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_CROS_EC
> tristate "ChromeOS Embedded Controller"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 8a28dc9..371020e 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -101,6 +101,7 @@ obj-$(CONFIG_PMIC_DA9052) += da9052-irq.o
> obj-$(CONFIG_PMIC_DA9052) += da9052-core.o
> obj-$(CONFIG_MFD_DA9052_SPI) += da9052-spi.o
> obj-$(CONFIG_MFD_DA9052_I2C) += da9052-i2c.o
> +obj-$(CONFIG_MFD_AXP20X) += axp20x.o
>
> obj-$(CONFIG_MFD_LP8788) += lp8788.o lp8788-irq.o
>
> diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
> new file mode 100644
> index 0000000..efd0cb3
> --- /dev/null
> +++ b/drivers/mfd/axp20x.c
> @@ -0,0 +1,251 @@
> +/*
> + * Author: Carlo Caione <carlo@caione.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/mfd/axp20x.h>
> +#include <linux/mfd/core.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +
> +static const struct regmap_range axp20x_writeable_ranges[] = {
> + {
> + .range_min = AXP20X_DATA(0),
> + .range_max = AXP20X_IRQ5_STATE,
> + }, {
> + .range_min = AXP20X_DCDC_MODE,
> + .range_max = AXP20X_FG_RES,
> + },
> +};
> +
> +static const struct regmap_range axp20x_volatile_ranges[] = {
> + {
> + .range_min = AXP20X_IRQ1_EN,
> + .range_max = AXP20X_IRQ5_STATE,
> + },
> +};
> +
> +static const struct regmap_access_table axp20x_writeable_table = {
> + .yes_ranges = axp20x_writeable_ranges,
> + .n_yes_ranges = ARRAY_SIZE(axp20x_writeable_ranges),
> +};
> +
> +static const struct regmap_access_table axp20x_volatile_table = {
> + .yes_ranges = axp20x_volatile_ranges,
> + .n_yes_ranges = ARRAY_SIZE(axp20x_volatile_ranges),
> +};
> +
> +static struct resource axp20x_pek_resources[] = {
> + {
> + .name = "PEK_DBR",
> + .start = AXP20X_IRQ_PEK_RIS_EDGE,
> + .end = AXP20X_IRQ_PEK_RIS_EDGE,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .name = "PEK_DBF",
> + .start = AXP20X_IRQ_PEK_FAL_EDGE,
> + .end = AXP20X_IRQ_PEK_FAL_EDGE,
> + .flags = IORESOURCE_IRQ,
> + },
> +
> +};

>From your documentation, it seems like you want to declare them in the
DT too. Why do you need to declare the resources in both locations?

> +
> +static const struct regmap_config axp20x_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .wr_table = &axp20x_writeable_table,
> + .volatile_table = &axp20x_volatile_table,
> + .max_register = AXP20X_FG_RES,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +#define AXP20X_IRQ(_irq, _off, _mask) \
> + [AXP20X_IRQ_##_irq] = { .reg_offset = (_off), .mask = BIT(_mask) }
> +
> +static const struct regmap_irq axp20x_regmap_irqs[] = {
> + AXP20X_IRQ(ACIN_OVER_V, 0, 7),
> + AXP20X_IRQ(ACIN_PLUGIN, 0, 6),
> + AXP20X_IRQ(ACIN_REMOVAL, 0, 5),
> + AXP20X_IRQ(VBUS_OVER_V, 0, 4),
> + AXP20X_IRQ(VBUS_PLUGIN, 0, 3),
> + AXP20X_IRQ(VBUS_REMOVAL, 0, 2),
> + AXP20X_IRQ(VBUS_V_LOW, 0, 1),
> + AXP20X_IRQ(BATT_PLUGIN, 1, 7),
> + AXP20X_IRQ(BATT_REMOVAL, 1, 6),
> + AXP20X_IRQ(BATT_ENT_ACT_MODE, 1, 5),
> + AXP20X_IRQ(BATT_EXIT_ACT_MODE, 1, 4),
> + AXP20X_IRQ(CHARG, 1, 3),
> + AXP20X_IRQ(CHARG_DONE, 1, 2),
> + AXP20X_IRQ(BATT_TEMP_HIGH, 1, 1),
> + AXP20X_IRQ(BATT_TEMP_LOW, 1, 0),
> + AXP20X_IRQ(DIE_TEMP_HIGH, 2, 7),
> + AXP20X_IRQ(CHARG_I_LOW, 2, 6),
> + AXP20X_IRQ(DCDC1_V_LONG, 2, 5),
> + AXP20X_IRQ(DCDC2_V_LONG, 2, 4),
> + AXP20X_IRQ(DCDC3_V_LONG, 2, 3),
> + AXP20X_IRQ(PEK_SHORT, 2, 1),
> + AXP20X_IRQ(PEK_LONG, 2, 0),
> + AXP20X_IRQ(N_OE_PWR_ON, 3, 7),
> + AXP20X_IRQ(N_OE_PWR_OFF, 3, 6),
> + AXP20X_IRQ(VBUS_VALID, 3, 5),
> + AXP20X_IRQ(VBUS_NOT_VALID, 3, 4),
> + AXP20X_IRQ(VBUS_SESS_VALID, 3, 3),
> + AXP20X_IRQ(VBUS_SESS_END, 3, 2),
> + AXP20X_IRQ(LOW_PWR_LVL1, 3, 1),
> + AXP20X_IRQ(LOW_PWR_LVL2, 3, 0),
> + AXP20X_IRQ(TIMER, 4, 7),
> + AXP20X_IRQ(PEK_RIS_EDGE, 4, 6),
> + AXP20X_IRQ(PEK_FAL_EDGE, 4, 5),
> + AXP20X_IRQ(GPIO3_INPUT, 4, 3),
> + AXP20X_IRQ(GPIO2_INPUT, 4, 2),
> + AXP20X_IRQ(GPIO1_INPUT, 4, 1),
> + AXP20X_IRQ(GPIO0_INPUT, 4, 0),
> +};
> +
> +static const struct regmap_irq_chip axp20x_regmap_irq_chip = {
> + .name = "axp20x_irq_chip",
> + .status_base = AXP20X_IRQ1_STATE,
> + .ack_base = AXP20X_IRQ1_STATE,
> + .mask_base = AXP20X_IRQ1_EN,
> + .num_regs = 5,
> + .irqs = axp20x_regmap_irqs,
> + .num_irqs = ARRAY_SIZE(axp20x_regmap_irqs),
> + .mask_invert = 1,
> + .init_ack_masked = 1,
> +};
> +
> +static struct mfd_cell axp20x_cells[] = {
> + {
> + .name = "axp20x-pek",
> + .of_compatible = "x-powers,axp20x-pek",
> + .num_resources = ARRAY_SIZE(axp20x_pek_resources),
> + .resources = axp20x_pek_resources,
> + }, {
> + .name = "axp20x-regulator",
> + },
> +};
> +
> +const struct of_device_id axp20x_of_match[] = {
> + { .compatible = "x-powers,axp20x", .data = (void *)AXP20X },
> + { },
> +};
> +
> +static struct axp20x_dev *axp20x_pm_power_off;
> +static void axp20x_power_off(void)
> +{
> + regmap_write(axp20x_pm_power_off->regmap, AXP20X_OFF_CTRL, 0x80);
> +}
> +
> +static int axp20x_i2c_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct axp20x_dev *axp20x;
> + const struct of_device_id *of_id;
> + int ret;
> +
> + axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
> + if (!axp20x)
> + return -ENOMEM;
> +
> + of_id = of_match_device(axp20x_of_match, &i2c->dev);
> + if (!of_id) {
> + dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
> + return -ENODEV;
> + }
> + axp20x->variant = (int) of_id->data;
> +
> + axp20x->i2c_client = i2c;
> + i2c_set_clientdata(i2c, axp20x);
> +
> + axp20x->dev = &i2c->dev;
> + dev_set_drvdata(axp20x->dev, axp20x);
> +
> + axp20x->regmap = devm_regmap_init_i2c(i2c, &axp20x_regmap_config);
> + if (IS_ERR(axp20x->regmap)) {
> + ret = PTR_ERR(axp20x->regmap);
> + dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
> + return ret;
> + }
> +
> + axp20x->irq = i2c->irq;
> + ret = regmap_add_irq_chip(axp20x->regmap, axp20x->irq,
> + IRQF_ONESHOT | IRQF_SHARED, -1,
> + &axp20x_regmap_irq_chip,
> + &axp20x->regmap_irqc);
> + if (ret != 0) {
> + dev_err(&i2c->dev, "failed to add irq chip: %d\n", ret);
> + return ret;
> + }
> +
> + ret = mfd_add_devices(axp20x->dev, -1, axp20x_cells,
> + ARRAY_SIZE(axp20x_cells), NULL, 0, NULL);
> + if (ret != 0) {
> + dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
> + goto mfd_err;
> + }
> +
> + if (!pm_power_off) {
> + axp20x_pm_power_off = axp20x;
> + pm_power_off = axp20x_power_off;
> + }
> +
> + dev_info(&i2c->dev, "AXP20X driver loaded\n");
> +
> + return 0;
> +
> +mfd_err:
> + regmap_del_irq_chip(axp20x->irq, axp20x->regmap_irqc);
> +
> + return ret;
> +}
> +
> +static int axp20x_i2c_remove(struct i2c_client *i2c)
> +{
> + struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);
> +
> + if (axp20x == axp20x_pm_power_off) {
> + axp20x_pm_power_off = NULL;
> + pm_power_off = NULL;
> + }
> +
> + mfd_remove_devices(axp20x->dev);
> + regmap_del_irq_chip(axp20x->i2c_client->irq, axp20x->regmap_irqc);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id axp20x_i2c_id[] = {
> + { "axp20x", AXP20X },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
> +
> +static struct i2c_driver axp20x_i2c_driver = {
> + .driver = {
> + .name = "axp20x",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(axp20x_of_match),
> + },
> + .probe = axp20x_i2c_probe,
> + .remove = axp20x_i2c_remove,
> + .id_table = axp20x_i2c_id,
> +};
> +
> +module_i2c_driver(axp20x_i2c_driver);
> +
> +MODULE_DESCRIPTION("PMIC MFD core driver for AXP20X");
> +MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
> new file mode 100644
> index 0000000..94d99fd
> --- /dev/null
> +++ b/include/linux/mfd/axp20x.h
> @@ -0,0 +1,178 @@
> +/*
> + * Functions to access AXP20X power management chip.
> + *
> + * Copyright (C) 2013, Carlo Caione <carlo@caione.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __LINUX_MFD_AXP20X_H
> +#define __LINUX_MFD_AXP20X_H
> +
> +#define AXP20X 0
> +
> +#define AXP20X_DATA(m) (0x04 + (m))
> +
> +/* Power supply */
> +#define AXP20X_PWR_INPUT_STATUS 0x00
> +#define AXP20X_PWR_OP_MODE 0x01
> +#define AXP20X_USB_OTG_STATUS 0x02
> +#define AXP20X_PWR_OUT_CTRL 0x12
> +#define AXP20X_DCDC2_V_OUT 0x23
> +#define AXP20X_DCDC2_LDO3_V_SCAL 0x25
> +#define AXP20X_DCDC3_V_OUT 0x27
> +#define AXP20X_LDO24_V_OUT 0x28
> +#define AXP20X_LDO3_V_OUT 0x29
> +#define AXP20X_VBUS_IPSOUT_MGMT 0x30
> +#define AXP20X_V_OFF 0x31
> +#define AXP20X_OFF_CTRL 0x32
> +#define AXP20X_CHRG_CTRL1 0x33
> +#define AXP20X_CHRG_CTRL2 0x34
> +#define AXP20X_CHRG_BAK_CTRL 0x35
> +#define AXP20X_PEK_KEY 0x36
> +#define AXP20X_DCDC_FREQ 0x37
> +#define AXP20X_V_LTF_CHRG 0x38
> +#define AXP20X_V_HTF_CHRG 0x39
> +#define AXP20X_APS_WARN_L1 0x3a
> +#define AXP20X_APS_WARN_L2 0x3b
> +#define AXP20X_V_LTF_DISCHRG 0x3c
> +#define AXP20X_V_HTF_DISCHRG 0x3d
> +
> +/* Interrupt */
> +#define AXP20X_IRQ1_EN 0x40
> +#define AXP20X_IRQ2_EN 0x41
> +#define AXP20X_IRQ3_EN 0x42
> +#define AXP20X_IRQ4_EN 0x43
> +#define AXP20X_IRQ5_EN 0x44
> +#define AXP20X_IRQ1_STATE 0x48
> +#define AXP20X_IRQ2_STATE 0x49
> +#define AXP20X_IRQ3_STATE 0x4a
> +#define AXP20X_IRQ4_STATE 0x4b
> +#define AXP20X_IRQ5_STATE 0x4c
> +
> +/* ADC */
> +#define AXP20X_ACIN_V_ADC_H 0x56
> +#define AXP20X_ACIN_V_ADC_L 0x57
> +#define AXP20X_ACIN_I_ADC_H 0x58
> +#define AXP20X_ACIN_I_ADC_L 0x59
> +#define AXP20X_VBUS_V_ADC_H 0x5a
> +#define AXP20X_VBUS_V_ADC_L 0x5b
> +#define AXP20X_VBUS_I_ADC_H 0x5c
> +#define AXP20X_VBUS_I_ADC_L 0x5d
> +#define AXP20X_TEMP_ADC_H 0x5e
> +#define AXP20X_TEMP_ADC_L 0x5f
> +#define AXP20X_TS_IN_H 0x62
> +#define AXP20X_TS_IN_L 0x63
> +#define AXP20X_GPIO0_V_ADC_H 0x64
> +#define AXP20X_GPIO0_V_ADC_L 0x65
> +#define AXP20X_GPIO1_V_ADC_H 0x66
> +#define AXP20X_GPIO1_V_ADC_L 0x67
> +#define AXP20X_PWR_BATT_H 0x70
> +#define AXP20X_PWR_BATT_M 0x71
> +#define AXP20X_PWR_BATT_L 0x72
> +#define AXP20X_BATT_V_H 0x78
> +#define AXP20X_BATT_V_L 0x79
> +#define AXP20X_BATT_CHRG_I_H 0x7a
> +#define AXP20X_BATT_CHRG_I_L 0x7b
> +#define AXP20X_BATT_DISCHRG_I_H 0x7c
> +#define AXP20X_BATT_DISCHRG_I_L 0x7d
> +#define AXP20X_IPSOUT_V_HIGH_H 0x7e
> +#define AXP20X_IPSOUT_V_HIGH_L 0x7f
> +
> +/* Power supply */
> +#define AXP20X_DCDC_MODE 0x80
> +#define AXP20X_ADC_EN1 0x82
> +#define AXP20X_ADC_EN2 0x83
> +#define AXP20X_ADC_RATE 0x84
> +#define AXP20X_GPIO10_IN_RANGE 0x85
> +#define AXP20X_GPIO1_ADC_IRQ_RIS 0x86
> +#define AXP20X_GPIO1_ADC_IRQ_FAL 0x87
> +#define AXP20X_TIMER_CTRL 0x8a
> +#define AXP20X_VBUS_MON 0x8b
> +#define AXP20X_OVER_TMP 0x8f
> +
> +/* GPIO */
> +#define AXP20X_GPIO0_CTRL 0x90
> +#define AXP20X_LDO5_V_OUT 0x91
> +#define AXP20X_GPIO1_CTRL 0x92
> +#define AXP20X_GPIO2_CTRL 0x93
> +#define AXP20X_GPIO20_SS 0x94
> +#define AXP20X_GPIO3_CTRL 0x95
> +
> +/* Battery */
> +#define AXP20X_CHRG_CC_31_24 0xb0
> +#define AXP20X_CHRG_CC_23_16 0xb1
> +#define AXP20X_CHRG_CC_15_8 0xb2
> +#define AXP20X_CHRG_CC_7_0 0xb3
> +#define AXP20X_DISCHRG_CC_31_24 0xb4
> +#define AXP20X_DISCHRG_CC_23_16 0xb5
> +#define AXP20X_DISCHRG_CC_15_8 0xb6
> +#define AXP20X_DISCHRG_CC_7_0 0xb7
> +#define AXP20X_CC_CTRL 0xb8
> +#define AXP20X_FG_RES 0xb9
> +
> +/* Regulators IDs */
> +enum {
> + AXP20X_LDO1 = 0,
> + AXP20X_LDO2,
> + AXP20X_LDO3,
> + AXP20X_LDO4,
> + AXP20X_LDO5,
> + AXP20X_DCDC2,
> + AXP20X_DCDC3,
> + AXP20X_REG_ID_MAX,
> +};
> +
> +/* IRQs */
> +enum {
> + AXP20X_IRQ_ACIN_OVER_V = 1,
> + AXP20X_IRQ_ACIN_PLUGIN,
> + AXP20X_IRQ_ACIN_REMOVAL,
> + AXP20X_IRQ_VBUS_OVER_V,
> + AXP20X_IRQ_VBUS_PLUGIN,
> + AXP20X_IRQ_VBUS_REMOVAL,
> + AXP20X_IRQ_VBUS_V_LOW,
> + AXP20X_IRQ_BATT_PLUGIN,
> + AXP20X_IRQ_BATT_REMOVAL,
> + AXP20X_IRQ_BATT_ENT_ACT_MODE,
> + AXP20X_IRQ_BATT_EXIT_ACT_MODE,
> + AXP20X_IRQ_CHARG,
> + AXP20X_IRQ_CHARG_DONE,
> + AXP20X_IRQ_BATT_TEMP_HIGH,
> + AXP20X_IRQ_BATT_TEMP_LOW,
> + AXP20X_IRQ_DIE_TEMP_HIGH,
> + AXP20X_IRQ_CHARG_I_LOW,
> + AXP20X_IRQ_DCDC1_V_LONG,
> + AXP20X_IRQ_DCDC2_V_LONG,
> + AXP20X_IRQ_DCDC3_V_LONG,
> + AXP20X_IRQ_PEK_SHORT = 22,
> + AXP20X_IRQ_PEK_LONG,
> + AXP20X_IRQ_N_OE_PWR_ON,
> + AXP20X_IRQ_N_OE_PWR_OFF,
> + AXP20X_IRQ_VBUS_VALID,
> + AXP20X_IRQ_VBUS_NOT_VALID,
> + AXP20X_IRQ_VBUS_SESS_VALID,
> + AXP20X_IRQ_VBUS_SESS_END,
> + AXP20X_IRQ_LOW_PWR_LVL1,
> + AXP20X_IRQ_LOW_PWR_LVL2,
> + AXP20X_IRQ_TIMER,
> + AXP20X_IRQ_PEK_RIS_EDGE,
> + AXP20X_IRQ_PEK_FAL_EDGE,
> + AXP20X_IRQ_GPIO3_INPUT,
> + AXP20X_IRQ_GPIO2_INPUT,
> + AXP20X_IRQ_GPIO1_INPUT,
> + AXP20X_IRQ_GPIO0_INPUT,
> +};
> +
> +struct axp20x_dev {
> + struct device *dev;
> + struct i2c_client *i2c_client;
> + struct regmap *regmap;
> + struct regmap_irq_chip_data *regmap_irqc;
> + int variant;
> + int irq;
> +};
> +
> +#endif /* __LINUX_MFD_AXP20X_H */
> --
> 1.8.5.3
>

--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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