[PATCH v3 2/6] pinctrl: Introduce pinctrl driver for Qualcomm SSBI PMIC's

[Ivan T. Ivanov]

From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>

This introduces a pinctrl, pinconf, pinmux and gpio driver for the gpio
block found in pm8018, pm8038, pm8058, pm8917 and pm8921 pmics from
Qualcomm.

Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
---
 drivers/pinctrl/qcom/Kconfig             |  11 +
 drivers/pinctrl/qcom/Makefile            |   1 +
 drivers/pinctrl/qcom/pinctrl-ssbi-pmic.c | 870 +++++++++++++++++++++++++++++++
 3 files changed, 882 insertions(+)
 create mode 100644 drivers/pinctrl/qcom/pinctrl-ssbi-pmic.c

diff --git a/drivers/pinctrl/qcom/Kconfig b/drivers/pinctrl/qcom/Kconfig
index d160a71..6bd4e4d 100644
--- a/drivers/pinctrl/qcom/Kconfig
+++ b/drivers/pinctrl/qcom/Kconfig
@@ -39,4 +39,15 @@ config PINCTRL_MSM8X74
 	  This is the pinctrl, pinmux, pinconf and gpiolib driver for the
 	  Qualcomm TLMM block found in the Qualcomm 8974 platform.
 
+config PINCTRL_SSBI_PMIC
+       tristate "Qualcomm SSBI PMIC pin controller driver"
+       depends on GPIOLIB && OF
+       select PINCONF
+       select PINMUX
+       select GENERIC_PINCONF
+       help
+         This is the pinctrl, pinmux, pinconf and gpiolib driver for the
+         Qualcomm GPIO blocks found in the pm8018, pm8038, pm8058, pm8917 and
+         pm8921 pmics from Qualcomm.
+
 endif
diff --git a/drivers/pinctrl/qcom/Makefile b/drivers/pinctrl/qcom/Makefile
index 2a02602..8faa2ca 100644
--- a/drivers/pinctrl/qcom/Makefile
+++ b/drivers/pinctrl/qcom/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PINCTRL_APQ8064)	+= pinctrl-apq8064.o
 obj-$(CONFIG_PINCTRL_IPQ8064)	+= pinctrl-ipq8064.o
 obj-$(CONFIG_PINCTRL_MSM8960)	+= pinctrl-msm8960.o
 obj-$(CONFIG_PINCTRL_MSM8X74)	+= pinctrl-msm8x74.o
+obj-$(CONFIG_PINCTRL_SSBI_PMIC) += pinctrl-ssbi-pmic.o
diff --git a/drivers/pinctrl/qcom/pinctrl-ssbi-pmic.c b/drivers/pinctrl/qcom/pinctrl-ssbi-pmic.c
new file mode 100644
index 0000000..9a1b443
--- /dev/null
+++ b/drivers/pinctrl/qcom/pinctrl-ssbi-pmic.c
@@ -0,0 +1,870 @@
+/*
+ * Copyright (c) 2014, Sony Mobile Communications AB.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/gpio.h>
+#include <linux/mfd/pm8921-core.h>
+
+#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
+
+#include "../core.h"
+#include "../pinconf.h"
+#include "../pinctrl-utils.h"
+
+/* direction */
+#define PM8XXX_GPIO_DIR_OUT		BIT(0)
+#define PM8XXX_GPIO_DIR_IN		BIT(1)
+
+/* output buffer */
+#define PM8XXX_GPIO_PUSH_PULL		0
+#define PM8XXX_GPIO_OPEN_DRAIN		1
+
+/* bias */
+#define PM8XXX_GPIO_BIAS_PU_30		0
+#define PM8XXX_GPIO_BIAS_PU_1P5		1
+#define PM8XXX_GPIO_BIAS_PU_31P5	2
+#define PM8XXX_GPIO_BIAS_PU_1P5_30	3
+#define PM8XXX_GPIO_BIAS_PD		4
+#define PM8XXX_GPIO_BIAS_NP		5
+
+/* GPIO registers */
+#define SSBI_REG_ADDR_GPIO_BASE		0x150
+#define SSBI_REG_ADDR_GPIO(n)		(SSBI_REG_ADDR_GPIO_BASE + n)
+
+#define PM8XXX_GPIO_WRITE		BIT(7)
+
+#define PM8XXX_MAX_GPIOS		44
+
+/* Qualcomm specific pin configurations */
+#define PM8XXX_PINCONF_PULL_UP		(PIN_CONFIG_END + 1)
+#define PM8XXX_PINCONF_STRENGTH		(PIN_CONFIG_END + 2)
+
+struct pm8xxx_pinbindings {
+	const char *property;
+	unsigned param;
+	u32 default_value;
+};
+static struct pm8xxx_pinbindings pm8xxx_pinbindings[] = {
+	/* PMIC_GPIO_PULL_UP_30...  */
+	{"qcom,pull-up-strength",	PM8XXX_PINCONF_PULL_UP, 0},
+	/* PMIC_GPIO_STRENGTH_NO... */
+	{"qcom,drive-strength",		PM8XXX_PINCONF_STRENGTH, 0},
+};
+
+struct pm8xxx_gpio_pin {
+	int irq;
+
+	u8 power_source;
+	u8 direction;
+	u8 output_buffer;
+	u8 output_value;
+	u8 bias;
+	u8 output_strength;
+	u8 disable;
+	u8 function;
+	u8 non_inverted;
+};
+
+struct pm8xxx_gpio_data {
+	int ngpio;
+};
+
+struct pm8xxx_gpio {
+	struct device *dev;
+	struct regmap *regmap;
+	struct pinctrl_dev *pctrl;
+	struct gpio_chip chip;
+
+	const struct pm8xxx_gpio_data *data;
+
+	struct pm8xxx_gpio_pin pins[PM8XXX_MAX_GPIOS];
+};
+
+static inline struct pm8xxx_gpio *to_pm8xxx_gpio(struct gpio_chip *chip)
+{
+	return container_of(chip, struct pm8xxx_gpio, chip);
+};
+
+static const char * const pm8xxx_gpio_groups[PM8XXX_MAX_GPIOS] = {
+	"gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7", "gpio8",
+	"gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14", "gpio15",
+	"gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21", "gpio22",
+	"gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28", "gpio29",
+	"gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35", "gpio36",
+	"gpio37", "gpio38", "gpio39", "gpio40", "gpio41", "gpio42", "gpio43",
+	"gpio44",
+};
+
+static const char * const pm8xxx_gpio_functions[] = {
+	PMIC_GPIO_FUNC_NORMAL, PMIC_GPIO_FUNC_PAIRED,
+	PMIC_GPIO_FUNC_FUNC1, PMIC_GPIO_FUNC_FUNC2,
+	PMIC_GPIO_FUNC_DTEST1, PMIC_GPIO_FUNC_DTEST2,
+	PMIC_GPIO_FUNC_DTEST3, PMIC_GPIO_FUNC_DTEST4,
+};
+
+static int pm8xxx_gpio_read(struct pm8xxx_gpio *pctrl, int pin, int bank)
+{
+	int reg = SSBI_REG_ADDR_GPIO(pin);
+	unsigned int val = bank << 4;
+	int ret;
+
+	ret = regmap_write(pctrl->regmap, reg, val);
+	if (ret) {
+		dev_err(pctrl->dev,
+			"failed to select bank %d of pin %d\n", bank, pin);
+		return ret;
+	}
+
+	ret = regmap_read(pctrl->regmap, reg, &val);
+	if (ret) {
+		dev_err(pctrl->dev,
+			"failed to read register %d of pin %d\n", bank, pin);
+		return ret;
+	}
+
+	return val;
+}
+
+static int pm8xxx_gpio_write(struct pm8xxx_gpio *pctrl,
+			     int pin, int bank, u8 val)
+{
+	int ret;
+
+	val |= PM8XXX_GPIO_WRITE;
+	val |= bank << 4;
+
+	ret = regmap_write(pctrl->regmap, SSBI_REG_ADDR_GPIO(pin), val);
+	if (ret)
+		dev_err(pctrl->dev, "failed to write register\n");
+
+	return ret;
+}
+
+static int pm8xxx_gpio_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+	return pctrl->data->ngpio;
+}
+
+static const char *pm8xxx_gpio_get_group_name(struct pinctrl_dev *pctldev,
+				      unsigned group)
+{
+	return pm8xxx_gpio_groups[group];
+}
+
+static int pm8xxx_parse_dt_config(struct device *dev, struct device_node *np,
+			unsigned long **configs, unsigned int *nconfigs)
+{
+	struct pm8xxx_pinbindings *par;
+	unsigned long cfg[ARRAY_SIZE(pm8xxx_pinbindings)];
+	unsigned int ncfg = 0;
+	int ret, idx;
+	u32 val;
+
+	if (!np)
+		return -EINVAL;
+
+	for (idx = 0; idx < ARRAY_SIZE(pm8xxx_pinbindings); idx++) {
+		par = &pm8xxx_pinbindings[idx];
+		ret = of_property_read_u32(np, par->property, &val);
+
+		/* property not found */
+		if (ret == -EINVAL)
+			continue;
+
+		/* use default value, when no value is specified */
+		if (ret)
+			val = par->default_value;
+
+		dev_dbg(dev, "found %s with value %u\n", par->property, val);
+		cfg[ncfg] = pinconf_to_config_packed(par->param, val);
+		ncfg++;
+	}
+
+	ret = 0;
+
+	/* no configs found at qchip->npads */
+	if (ncfg == 0) {
+		*configs = NULL;
+		*nconfigs = 0;
+		goto out;
+	}
+
+	/*
+	 * Now limit the number of configs to the real number of
+	 * found properties.
+	 */
+	*configs = kcalloc(ncfg, sizeof(unsigned long), GFP_KERNEL);
+	if (!*configs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
+	*nconfigs = ncfg;
+
+out:
+	return ret;
+}
+
+static int pm8xxx_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+				  struct device_node *np,
+				  struct pinctrl_map **map,
+				  unsigned *reserv, unsigned *nmaps,
+				  enum pinctrl_map_type type)
+{
+	unsigned long *configs = NULL;
+	unsigned num_configs = 0;
+	struct property *prop;
+	const char *group;
+	int ret;
+
+	ret = pm8xxx_parse_dt_config(pctldev->dev, np, &configs, &num_configs);
+	if (ret < 0)
+		return ret;
+
+	if (!num_configs)
+		return 0;
+
+	ret = of_property_count_strings(np, "pins");
+	if (ret < 0)
+		goto exit;
+
+	ret = pinctrl_utils_reserve_map(pctldev, map, reserv,
+					nmaps, ret);
+	if (ret < 0)
+		goto exit;
+
+	of_property_for_each_string(np, "pins", prop, group) {
+		ret = pinctrl_utils_add_map_configs(pctldev, map,
+				reserv, nmaps, group, configs,
+				num_configs, type);
+		if (ret < 0)
+			break;
+	}
+exit:
+	kfree(configs);
+	return ret;
+}
+
+static int pm8xxx_dt_node_to_map(struct pinctrl_dev *pctldev,
+			       struct device_node *np_config,
+			       struct pinctrl_map **map,
+			       unsigned *nmaps)
+{
+	struct device_node *np;
+	enum pinctrl_map_type type;
+	unsigned reserv;
+	int ret;
+
+	ret = 0;
+	*map = NULL;
+	*nmaps = 0;
+	reserv = 0;
+	type = PIN_MAP_TYPE_CONFIGS_GROUP;
+
+	for_each_child_of_node(np_config, np) {
+
+		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
+							&reserv, nmaps, type);
+		if (ret)
+			break;
+
+		ret = pm8xxx_dt_subnode_to_map(pctldev, np, map, &reserv,
+					     nmaps, type);
+		if (ret)
+			break;
+	}
+
+	if (ret < 0)
+		pinctrl_utils_dt_free_map(pctldev, *map, *nmaps);
+
+	return ret;
+}
+
+static const struct pinctrl_ops pm8xxx_gpio_pinctrl_ops = {
+	.get_groups_count	= pm8xxx_gpio_get_groups_count,
+	.get_group_name		= pm8xxx_gpio_get_group_name,
+	.dt_node_to_map		= pm8xxx_dt_node_to_map,
+	.dt_free_map		= pinctrl_utils_dt_free_map,
+};
+
+static int pm8xxx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(pm8xxx_gpio_functions);
+}
+
+static const char *pm8xxx_get_function_name(struct pinctrl_dev *pctldev,
+					 unsigned function)
+{
+	return pm8xxx_gpio_functions[function];
+}
+
+static int pm8xxx_get_function_groups(struct pinctrl_dev *pctldev,
+				   unsigned function,
+				   const char * const **groups,
+				   unsigned * const num_groups)
+{
+	struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pm8xxx_gpio_groups;
+	*num_groups = pctrl->data->ngpio;
+	return 0;
+}
+
+static int pm8xxx_pinmux_enable(struct pinctrl_dev *pctldev,
+			     unsigned function,
+			     unsigned group)
+{
+	struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[group];
+	u8 val;
+
+	pin->function = function;
+	val = pin->function << 1;
+
+	pm8xxx_gpio_write(pctrl, group, 4, val);
+
+	return 0;
+}
+
+static const struct pinmux_ops pm8xxx_pinmux_ops = {
+	.get_functions_count	= pm8xxx_get_functions_count,
+	.get_function_name	= pm8xxx_get_function_name,
+	.get_function_groups	= pm8xxx_get_function_groups,
+	.enable			= pm8xxx_pinmux_enable,
+};
+
+static int pm8xxx_gpio_config_get(struct pinctrl_dev *pctldev,
+			  unsigned int offset,
+			  unsigned long *config)
+{
+	struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset];
+	unsigned param = pinconf_to_config_param(*config);
+	unsigned arg;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		arg = pin->bias == PM8XXX_GPIO_BIAS_NP;
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		arg = pin->bias == PM8XXX_GPIO_BIAS_PD;
+		break;
+	case PM8XXX_PINCONF_PULL_UP:
+		if (pin->bias >= PM8XXX_GPIO_BIAS_PU_30 &&
+		    pin->bias <= PM8XXX_GPIO_BIAS_PU_1P5_30)
+			arg = PMIC_GPIO_PULL_UP_30 + pin->bias;
+		else
+			arg = 0;
+		break;
+	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+		arg = pin->disable;
+		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+		arg = pin->direction == PM8XXX_GPIO_DIR_IN;
+		break;
+	case PIN_CONFIG_OUTPUT:
+		arg = pin->output_value;
+		break;
+	case PIN_CONFIG_POWER_SOURCE:
+		arg = pin->power_source;
+		break;
+	case PM8XXX_PINCONF_STRENGTH:
+		arg = pin->output_strength;
+		break;
+	case PIN_CONFIG_DRIVE_PUSH_PULL:
+		arg = pin->output_buffer == PM8XXX_GPIO_PUSH_PULL;
+		break;
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+		arg = pin->output_buffer == PM8XXX_GPIO_OPEN_DRAIN;
+		break;
+	default:
+		dev_err(pctrl->dev,
+			"unsupported config parameter: %x\n",
+			param);
+		return -EINVAL;
+	}
+
+	*config = pinconf_to_config_packed(param, arg);
+
+	return 0;
+}
+
+static int pm8xxx_gpio_config_set(struct pinctrl_dev *pctldev,
+				  unsigned int offset,
+				  unsigned long *configs,
+				  unsigned num_configs)
+{
+	struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset];
+	unsigned param;
+	unsigned arg;
+	unsigned i;
+	u8 banks = 0;
+	u8 val;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			pin->bias = PM8XXX_GPIO_BIAS_NP;
+			banks |= BIT(2);
+			pin->disable = 0;
+			banks |= BIT(3);
+			break;
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			pin->bias = PM8XXX_GPIO_BIAS_PD;
+			banks |= BIT(2);
+			pin->disable = 0;
+			banks |= BIT(3);
+			break;
+		case PM8XXX_PINCONF_PULL_UP:
+			if (arg < PMIC_GPIO_PULL_UP_30 ||
+			    arg > PMIC_GPIO_PULL_UP_1P5_30) {
+				dev_err(pctrl->dev, "invalid pull-up level\n");
+				return -EINVAL;
+			}
+			pin->bias = arg - PM8XXX_GPIO_BIAS_PU_30;
+			banks |= BIT(2);
+			pin->disable = 0;
+			banks |= BIT(3);
+			break;
+		case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+			pin->disable = 1;
+			banks |= BIT(3);
+			break;
+		case PIN_CONFIG_INPUT_ENABLE:
+			pin->direction = PM8XXX_GPIO_DIR_IN;
+			banks |= BIT(1);
+			break;
+		case PIN_CONFIG_OUTPUT:
+			pin->direction = PM8XXX_GPIO_DIR_OUT;
+			pin->output_value = !!arg;
+			banks |= BIT(1);
+			break;
+		case PIN_CONFIG_POWER_SOURCE:
+			pin->power_source = arg;
+			banks |= BIT(0);
+			break;
+		case PM8XXX_PINCONF_STRENGTH:
+			if (arg > PMIC_GPIO_STRENGTH_LOW) {
+				dev_err(pctrl->dev, "invalid drive strength\n");
+				return -EINVAL;
+			}
+			pin->output_strength = arg;
+			banks |= BIT(3);
+			break;
+		case PIN_CONFIG_DRIVE_PUSH_PULL:
+			pin->output_buffer = PM8XXX_GPIO_PUSH_PULL;
+			banks |= BIT(1);
+			break;
+		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+			pin->output_buffer = PM8XXX_GPIO_OPEN_DRAIN;
+			banks |= BIT(1);
+			break;
+		default:
+			dev_err(pctrl->dev,
+					"unsupported config parameter: %x\n",
+					param);
+			return -EINVAL;
+		}
+	}
+
+	if (banks & BIT(0))
+		pm8xxx_gpio_write(pctrl, offset, 0, pin->power_source << 1);
+
+	if (banks & BIT(1)) {
+		val = pin->direction << 2;
+		val |= pin->output_buffer << 1;
+		val |= pin->output_value;
+		pm8xxx_gpio_write(pctrl, offset, 1, val);
+	}
+
+	if (banks & BIT(2)) {
+		val = pin->bias << 1;
+		pm8xxx_gpio_write(pctrl, offset, 2, val);
+	}
+
+	if (banks & BIT(3)) {
+		val = pin->output_strength << 2;
+		val |= pin->disable;
+		pm8xxx_gpio_write(pctrl, offset, 3, val);
+	}
+
+	if (banks & BIT(4)) {
+		val = pin->function << 1;
+		pm8xxx_gpio_write(pctrl, offset, 4, val);
+	}
+
+	if (banks & BIT(5)) {
+		val = 0;
+		if (pin->non_inverted)
+			val |= BIT(3);
+		pm8xxx_gpio_write(pctrl, offset, 5, val);
+	}
+
+	return 0;
+}
+
+static const struct pinconf_ops pm8xxx_gpio_pinconf_ops = {
+	.pin_config_group_get = pm8xxx_gpio_config_get,
+	.pin_config_group_set = pm8xxx_gpio_config_set,
+};
+
+static struct pinctrl_desc pm8xxx_gpio_desc = {
+	.pctlops = &pm8xxx_gpio_pinctrl_ops,
+	.pmxops = &pm8xxx_pinmux_ops,
+	.confops = &pm8xxx_gpio_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static int pm8xxx_gpio_direction_input(struct gpio_chip *chip,
+				       unsigned offset)
+{
+	struct pm8xxx_gpio *pctrl = to_pm8xxx_gpio(chip);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset - 1];
+	u8 val;
+
+	pin->direction = PM8XXX_GPIO_DIR_IN;
+	val = pin->direction << 2;
+
+	pm8xxx_gpio_write(pctrl, offset, 1, val);
+
+	return 0;
+}
+
+static int pm8xxx_gpio_direction_output(struct gpio_chip *chip,
+					unsigned offset,
+					int value)
+{
+	struct pm8xxx_gpio *pctrl = to_pm8xxx_gpio(chip);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset - 1];
+	u8 val;
+
+	pin->direction = PM8XXX_GPIO_DIR_OUT;
+	pin->output_value = !!value;
+
+	val = pin->direction << 2;
+	val |= pin->output_buffer << 1;
+	val |= pin->output_value;
+
+	pm8xxx_gpio_write(pctrl, offset, 1, val);
+
+	return 0;
+}
+
+static int pm8xxx_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct pm8xxx_gpio *pctrl = to_pm8xxx_gpio(chip);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset - 1];
+
+	if (pin->direction == PM8XXX_GPIO_DIR_OUT)
+		return pin->output_value;
+
+	return pm8xxx_read_irq_status(pin->irq);
+}
+
+static void pm8xxx_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+	struct pm8xxx_gpio *pctrl = to_pm8xxx_gpio(gc);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset - 1];
+	u8 val;
+
+	pin->output_value = !!value;
+
+	val = pin->direction << 2;
+	val |= pin->output_buffer << 1;
+	val |= pin->output_value;
+
+	pm8xxx_gpio_write(pctrl, offset, 1, val);
+}
+
+static int pm8xxx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct pm8xxx_gpio *pctrl = to_pm8xxx_gpio(chip);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset - 1];
+
+	return pin->irq;
+}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/seq_file.h>
+
+static void pm8xxx_gpio_dbg_show_one(struct seq_file *s,
+				  struct pinctrl_dev *pctldev,
+				  struct gpio_chip *chip,
+				  unsigned offset,
+				  unsigned gpio)
+{
+	struct pm8xxx_gpio *pctrl = to_pm8xxx_gpio(chip);
+	struct pm8xxx_gpio_pin *pin = &pctrl->pins[offset];
+
+	static const char * const directions[] = {
+		"off", "out", "in", "both"
+	};
+	static const char * const biases[] = {
+		"pull-up 30uA", "pull-up 1.5uA", "pull-up 31.5uA",
+		"pull-up 1.5uA + 30uA boost", "pull-down 10uA", "no pull"
+	};
+	static const char * const buffer_types[] = {
+		"push-pull", "open-drain"
+	};
+	static const char * const strengths[] = {
+		"no", "high", "medium", "low"
+	};
+
+	seq_printf(s, " gpio%-2d:", offset + 1);
+	if (pin->disable) {
+		seq_puts(s, " ---");
+	} else {
+		seq_printf(s, " %-4s", directions[pin->direction]);
+		seq_printf(s, " %-7s", pm8xxx_gpio_functions[pin->function]);
+		seq_printf(s, " VIN%d", pin->power_source);
+		seq_printf(s, " %-27s", biases[pin->bias]);
+		seq_printf(s, " %-10s", buffer_types[pin->output_buffer]);
+		seq_printf(s, " %-4s", pin->output_value ? "high" : "low");
+		seq_printf(s, " %-7s", strengths[pin->output_strength]);
+		if (!pin->non_inverted)
+			seq_puts(s, " inverted");
+	}
+}
+
+static void pm8xxx_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+	unsigned gpio = chip->base;
+	unsigned i;
+
+	for (i = 0; i < chip->ngpio; i++, gpio++) {
+		pm8xxx_gpio_dbg_show_one(s, NULL, chip, i, gpio);
+		seq_puts(s, "\n");
+	}
+}
+
+#else
+#define msm_gpio_dbg_show NULL
+#endif
+
+static struct gpio_chip pm8xxx_gpio_template = {
+	.direction_input = pm8xxx_gpio_direction_input,
+	.direction_output = pm8xxx_gpio_direction_output,
+	.get = pm8xxx_gpio_get,
+	.set = pm8xxx_gpio_set,
+	.to_irq = pm8xxx_gpio_to_irq,
+	.dbg_show = pm8xxx_gpio_dbg_show,
+	.owner = THIS_MODULE,
+};
+
+static int pm8xxx_gpio_populate(struct pm8xxx_gpio *pctrl)
+{
+	struct pm8xxx_gpio_pin *pin;
+	int val;
+	int i;
+
+	for (i = 0; i < pctrl->data->ngpio; i++) {
+		pin = &pctrl->pins[i];
+
+		val = pm8xxx_gpio_read(pctrl, i, 0);
+		if (val < 0)
+			return val;
+
+		pin->power_source = (val >> 1) & 0x7;
+
+		val = pm8xxx_gpio_read(pctrl, i, 1);
+		if (val < 0)
+			return val;
+
+		pin->direction = (val >> 2) & 0x3;
+		pin->output_buffer = !!(val & BIT(1));
+		pin->output_value = val & BIT(0);
+
+		val = pm8xxx_gpio_read(pctrl, i, 2);
+		if (val < 0)
+			return val;
+
+		pin->bias = (val >> 1) & 0x7;
+
+		val = pm8xxx_gpio_read(pctrl, i, 3);
+		if (val < 0)
+			return val;
+
+		pin->output_strength = (val >> 2) & 0x3;
+		pin->disable = val & BIT(0);
+
+		val = pm8xxx_gpio_read(pctrl, i, 4);
+		if (val < 0)
+			return val;
+
+		pin->function = (val >> 1) & 0x7;
+
+		val = pm8xxx_gpio_read(pctrl, i, 5);
+		if (val < 0)
+			return val;
+
+		pin->non_inverted = !!(val & BIT(3));
+	}
+
+	return 0;
+}
+
+static const struct pm8xxx_gpio_data pm8018_gpio_data = {
+	.ngpio = 6,
+};
+
+static const struct pm8xxx_gpio_data pm8038_gpio_data = {
+	.ngpio = 12,
+};
+
+static const struct pm8xxx_gpio_data pm8058_gpio_data = {
+	.ngpio = 40,
+};
+static const struct pm8xxx_gpio_data pm8917_gpio_data = {
+	.ngpio = 38,
+};
+
+static const struct pm8xxx_gpio_data pm8921_gpio_data = {
+	.ngpio = 44,
+};
+
+static const struct of_device_id pm8xxx_gpio_of_match[] = {
+	{ .compatible = "qcom,pm8018-gpio", .data = &pm8018_gpio_data },
+	{ .compatible = "qcom,pm8038-gpio", .data = &pm8038_gpio_data },
+	{ .compatible = "qcom,pm8058-gpio", .data = &pm8058_gpio_data },
+	{ .compatible = "qcom,pm8917-gpio", .data = &pm8917_gpio_data },
+	{ .compatible = "qcom,pm8921-gpio", .data = &pm8921_gpio_data },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pm8xxx_gpio_of_match);
+
+static int pm8xxx_gpio_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	struct pm8xxx_gpio *pctrl;
+	int ret;
+	int i;
+
+	match = of_match_node(pm8xxx_gpio_of_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
+
+	pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
+	if (!pctrl)
+		return -ENOMEM;
+
+	pctrl->dev = &pdev->dev;
+	pctrl->data = match->data;
+
+	BUG_ON(pctrl->data->ngpio > PM8XXX_MAX_GPIOS);
+
+	pctrl->chip = pm8xxx_gpio_template;
+	pctrl->chip.base = -1;
+	pctrl->chip.dev = &pdev->dev;
+	pctrl->chip.of_node = pdev->dev.of_node;
+	pctrl->chip.label = dev_name(pctrl->dev);
+	pctrl->chip.ngpio = pctrl->data->ngpio;
+
+	pctrl->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!pctrl->regmap) {
+		dev_err(&pdev->dev, "parent regmap unavailable\n");
+		return -ENXIO;
+	}
+
+	for (i = 0; i < pctrl->data->ngpio; i++) {
+		ret = platform_get_irq(pdev, i);
+		if (ret < 0) {
+			dev_err(&pdev->dev,
+				"missing interrupts for pin %d\n", i);
+			return ret;
+		}
+
+		pctrl->pins[i].irq = ret;
+	}
+
+	ret = pm8xxx_gpio_populate(pctrl);
+	if (ret)
+		return ret;
+
+	pm8xxx_gpio_desc.name = dev_name(&pdev->dev);
+	pctrl->pctrl = pinctrl_register(&pm8xxx_gpio_desc, &pdev->dev, pctrl);
+	if (!pctrl->pctrl) {
+		dev_err(&pdev->dev, "couldn't register pm8xxx gpio driver\n");
+		return -ENODEV;
+	}
+
+	ret = gpiochip_add(&pctrl->chip);
+	if (ret) {
+		dev_err(&pdev->dev, "failed register gpiochip\n");
+		goto unregister_pinctrl;
+	}
+
+	ret = gpiochip_add_pin_range(&pctrl->chip,
+				     dev_name(pctrl->dev),
+				     1, 0, pctrl->data->ngpio);
+	if (ret) {
+		dev_err(pctrl->dev, "failed to add pin range\n");
+		goto unregister_gpiochip;
+	}
+
+	platform_set_drvdata(pdev, pctrl);
+
+	dev_dbg(&pdev->dev, "Qualcomm pm8xxx gpio driver probed\n");
+
+	return 0;
+
+unregister_pinctrl:
+	pinctrl_unregister(pctrl->pctrl);
+
+unregister_gpiochip:
+	if (gpiochip_remove(&pctrl->chip))
+		dev_err(&pdev->dev, "unable to unregister gpiochip\n");
+
+	return ret;
+}
+
+static int pm8xxx_gpio_remove(struct platform_device *pdev)
+{
+	struct pm8xxx_gpio *pctrl = platform_get_drvdata(pdev);
+
+	gpiochip_remove(&pctrl->chip);
+
+	pinctrl_unregister(pctrl->pctrl);
+
+	return 0;
+}
+
+static struct platform_driver pm8xxx_gpio_driver = {
+	.driver = {
+		.name = "ssbi-pmic-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = pm8xxx_gpio_of_match,
+	},
+	.probe = pm8xxx_gpio_probe,
+	.remove = pm8xxx_gpio_remove,
+};
+
+module_platform_driver(pm8xxx_gpio_driver);
+
+MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Qualcomm SSBI PMIC GPIO driver");
+MODULE_LICENSE("GPL v2");
-- 
1.8.3.2

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