This patch adds pinctrl/GPIO driver for STMicroelectronics
Multi-Function eXpander (STMFX) GPIO expander.
STMFX is an I2C slave controller, offering up to 24 GPIOs.
The driver relies on generic pin config interface to configure the GPIOs.
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
---
drivers/pinctrl/Kconfig | 13 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-stmfx.c | 985 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 999 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-stmfx.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 0f254b3..4ab07aa 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -263,6 +263,19 @@ config PINCTRL_ST
select PINCONF
select GPIOLIB_IRQCHIP
+config PINCTRL_STMFX
+ tristate "STMicroelectronics STMFX I2C GPIO expander pinctrl driver"
+ depends on GPIOLIB && I2C=y
+ select GENERIC_PINCONF
+ select GPIOLIB_IRQCHIP
+ select REGMAP_I2C
+ help
+ I2C driver for STMicroelectronics Multi-Function eXpander (STMFX)
+ GPIO expander.
+ This provides a GPIO interface supporting inputs and outputs,
+ and configuring push-pull, open-drain, and can also be used as
+ interrupt-controller.
+
config PINCTRL_TZ1090
bool "Toumaz Xenif TZ1090 pin control driver"
depends on SOC_TZ1090
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index d369263..271c464 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_PINCTRL_LANTIQ) += pinctrl-lantiq.o
obj-$(CONFIG_PINCTRL_LPC18XX) += pinctrl-lpc18xx.o
obj-$(CONFIG_PINCTRL_TB10X) += pinctrl-tb10x.o
obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
+obj-$(CONFIG_PINCTRL_STMFX) += pinctrl-stmfx.o
obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
obj-$(CONFIG_PINCTRL_INGENIC) += pinctrl-ingenic.o
obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c
new file mode 100644
index 0000000..d59a7bc
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-stmfx.c
@@ -0,0 +1,985 @@
+// SPDX-Licence-Identifier: GPL-2.0
+/*
+ * Driver for STMicroelectronics Multi-Function eXpander (STMFX) GPIO expander
+ *
+ * Copyright (C) 2018 STMicroelectronics
+ * Author(s): Amelie Delaunay <amelie.delaunay@xxxxxx>.
+ */
+#include <linux/bitfield.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/* General */
+#define STMFX_REG_CHIP_ID 0x00 /* R */
+#define STMFX_REG_FW_VERSION_MSB 0x01 /* R */
+#define STMFX_REG_FW_VERSION_LSB 0x02 /* R */
+#define STMFX_REG_SYS_CTRL 0x40 /* RW */
+/* IRQ output management */
+#define STMFX_REG_IRQ_OUT_PIN 0x41 /* RW */
+#define STMFX_REG_IRQ_SRC_EN 0x42 /* RW */
+#define STMFX_REG_IRQ_PENDING 0x08 /* R */
+#define STMFX_REG_IRQ_ACK 0x44 /* RW */
+
+/* MFX boot time is around 10ms, so after reset, we have to wait this delay */
+#define STMFX_BOOT_TIME_MS 10
+
+/* GPIOs expander */
+/* GPIO_STATE1 0x10, GPIO_STATE2 0x11, GPIO_STATE3 0x12 */
+#define STMFX_REG_GPIO_STATE 0x10 /* R */
+/* GPIO_DIR1 0x60, GPIO_DIR2 0x61, GPIO_DIR3 0x63 */
+#define STMFX_REG_GPIO_DIR 0x60 /* RW */
+/* GPIO_TYPE1 0x64, GPIO_TYPE2 0x65, GPIO_TYPE3 0x66 */
+#define STMFX_REG_GPIO_TYPE 0x64 /* RW */
+/* GPIO_PUPD1 0x68, GPIO_PUPD2 0x69, GPIO_PUPD3 0x6A */
+#define STMFX_REG_GPIO_PUPD 0x68 /* RW */
+/* GPO_SET1 0x6C, GPO_SET2 0x6D, GPO_SET3 0x6E */
+#define STMFX_REG_GPO_SET 0x6C /* RW */
+/* GPO_CLR1 0x70, GPO_CLR2 0x71, GPO_CLR3 0x72 */
+#define STMFX_REG_GPO_CLR 0x70 /* RW */
+/* IRQ_GPI_SRC1 0x48, IRQ_GPI_SRC2 0x49, IRQ_GPI_SRC3 0x4A */
+#define STMFX_REG_IRQ_GPI_SRC 0x48 /* RW */
+/* IRQ_GPI_EVT1 0x4C, IRQ_GPI_EVT2 0x4D, IRQ_GPI_EVT3 0x4E */
+#define STMFX_REG_IRQ_GPI_EVT 0x4C /* RW */
+/* IRQ_GPI_TYPE1 0x50, IRQ_GPI_TYPE2 0x51, IRQ_GPI_TYPE3 0x52 */
+#define STMFX_REG_IRQ_GPI_TYPE 0x50 /* RW */
+/* IRQ_GPI_PENDING1 0x0C, IRQ_GPI_PENDING2 0x0D, IRQ_GPI_PENDING3 0x0E*/
+#define STMFX_REG_IRQ_GPI_PENDING 0x0C /* R */
+/* IRQ_GPI_ACK1 0x54, IRQ_GPI_ACK2 0x55, IRQ_GPI_ACK3 0x56 */
+#define STMFX_REG_IRQ_GPI_ACK 0x54 /* RW */
+
+/* STMFX_REG_CHIP_ID bitfields */
+#define STMFX_REG_CHIP_ID_MASK GENMASK(7, 0)
+
+/* STMFX_REG_SYS_CTRL bitfields */
+#define STMFX_REG_SYS_CTRL_GPIO_EN BIT(0)
+#define STMFX_REG_SYS_CTRL_ALTGPIO_EN BIT(3)
+#define STMFX_REG_SYS_CTRL_SWRST BIT(7)
+
+/* STMFX_REG_IRQ_OUT_PIN bitfields */
+#define STMFX_REG_IRQ_OUT_PIN_TYPE BIT(0) /* 0-OD 1-PP */
+#define STMFX_REG_IRQ_OUT_PIN_POL BIT(1) /* 0-active LOW 1-active HIGH */
+
+/* STMFX_REG_IRQ_SRC_EN bitfields */
+#define STMFX_REG_IRQ_SRC_EN_GPIO BIT(0)
+
+/* STMFX_REG_IRQ_PENDING bitfields */
+#define STMFX_REG_IRQ_PENDING_GPIO BIT(0)
+
+#define NR_GPIO_REGS 3
+#define NR_GPIOS_PER_REG 8
+#define get_reg(offset) ((offset) / NR_GPIOS_PER_REG)
+#define get_shift(offset) ((offset) % NR_GPIOS_PER_REG)
+#define get_mask(offset) (BIT(get_shift(offset)))
+
+static const struct pinctrl_pin_desc stmfx_pins[] = {
+ PINCTRL_PIN(0, "gpio0"),
+ PINCTRL_PIN(1, "gpio1"),
+ PINCTRL_PIN(2, "gpio2"),
+ PINCTRL_PIN(3, "gpio3"),
+ PINCTRL_PIN(4, "gpio4"),
+ PINCTRL_PIN(5, "gpio5"),
+ PINCTRL_PIN(6, "gpio6"),
+ PINCTRL_PIN(7, "gpio7"),
+ PINCTRL_PIN(8, "gpio8"),
+ PINCTRL_PIN(9, "gpio9"),
+ PINCTRL_PIN(10, "gpio10"),
+ PINCTRL_PIN(11, "gpio11"),
+ PINCTRL_PIN(12, "gpio12"),
+ PINCTRL_PIN(13, "gpio13"),
+ PINCTRL_PIN(14, "gpio14"),
+ PINCTRL_PIN(15, "gpio15"),
+ PINCTRL_PIN(16, "agpio0"),
+ PINCTRL_PIN(17, "agpio1"),
+ PINCTRL_PIN(18, "agpio2"),
+ PINCTRL_PIN(19, "agpio3"),
+ PINCTRL_PIN(20, "agpio4"),
+ PINCTRL_PIN(21, "agpio5"),
+ PINCTRL_PIN(22, "agpio6"),
+ PINCTRL_PIN(23, "agpio7"),
+};
+
+struct stmfx {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regulator *vdd;
+ struct stmfx_pinctrl *pctl;
+ int irq;
+};
+
+struct stmfx_pinctrl {
+ struct device *dev;
+ struct regmap *regmap;
+ struct pinctrl_dev *pctl_dev;
+ struct pinctrl_desc pctl_desc;
+ struct gpio_chip gpio_chip;
+ struct irq_chip irq_chip;
+ struct mutex lock; /* IRQ bus lock */
+ u8 irq_gpi_src[NR_GPIO_REGS];
+ u8 irq_gpi_type[NR_GPIO_REGS];
+ u8 irq_gpi_evt[NR_GPIO_REGS];
+ u8 irq_toggle_edge[NR_GPIO_REGS];
+#ifdef CONFIG_PM
+ u8 bkp_gpio_state[NR_GPIO_REGS];
+ u8 bkp_gpio_dir[NR_GPIO_REGS];
+ u8 bkp_gpio_type[NR_GPIO_REGS];
+ u8 bkp_gpio_pupd[NR_GPIO_REGS];
+#endif
+};
+
+static int stmfx_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
+ u32 reg = STMFX_REG_GPIO_STATE + get_reg(offset);
+ u32 mask = get_mask(offset);
+ u32 value;
+ int ret;
+
+ ret = regmap_read(pctl->regmap, reg, &value);
+
+ return ret ? ret : !!(value & mask);
+}
+
+static void stmfx_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
+ u32 reg = value ? STMFX_REG_GPO_SET : STMFX_REG_GPO_CLR;
+ u32 mask = get_mask(offset);
+
+ regmap_write_bits(pctl->regmap, reg + get_reg(offset), mask, mask);
+}
+
+static int stmfx_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
+ u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
+ u32 mask = get_mask(offset);
+ u32 val;
+ int ret;
+
+ ret = regmap_read(pctl->regmap, reg, &val);
+ /*
+ * On stmfx, gpio pins direction is (0)input, (1)output.
+ * .get_direction returns 0=out, 1=in
+ */
+
+ return ret ? ret : !(val & mask);
+}
+
+static int stmfx_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
+{
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
+ u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
+ u32 mask = get_mask(offset);
+
+ return regmap_write_bits(pctl->regmap, reg, mask, 0);
+}
+
+static int stmfx_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
+ u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
+ u32 mask = get_mask(offset);
+
+ stmfx_gpio_set(gc, offset, value);
+
+ return regmap_write_bits(pctl->regmap, reg, mask, mask);
+}
+
+static int stmfx_pinconf_get_pupd(struct stmfx_pinctrl *pctl,
+ unsigned int offset)
+{
+ u32 reg = STMFX_REG_GPIO_PUPD + get_reg(offset);
+ u32 pupd;
+ int ret;
+
+ ret = regmap_read(pctl->regmap, reg, &pupd);
+ if (ret)
+ return ret;
+
+ return (pupd & get_mask(offset));
+}
+
+static int stmfx_pinconf_set_pupd(struct stmfx_pinctrl *pctl,
+ unsigned int offset, u32 pupd)
+{
+ u32 reg = STMFX_REG_GPIO_PUPD + get_reg(offset);
+ u32 mask = get_mask(offset);
+
+ return regmap_write_bits(pctl->regmap, reg, mask, pupd ? mask : 0);
+}
+
+static int stmfx_pinconf_get_type(struct stmfx_pinctrl *pctl,
+ unsigned int offset)
+{
+ u32 reg = STMFX_REG_GPIO_TYPE + get_reg(offset);
+ u32 type;
+ int ret;
+
+ ret = regmap_read(pctl->regmap, reg, &type);
+ if (ret)
+ return 0;
+
+ return (type & get_mask(offset));
+}
+
+static int stmfx_pinconf_set_type(struct stmfx_pinctrl *pctl,
+ unsigned int offset, u32 type)
+{
+ u32 reg = STMFX_REG_GPIO_TYPE + get_reg(offset);
+ u32 mask = get_mask(offset);
+
+ return regmap_write_bits(pctl->regmap, reg, mask, type ? mask : 0);
+}
+
+static int stmfx_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct stmfx_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+ u32 param = pinconf_to_config_param(*config);
+ u32 dir, type, pupd;
+ u32 arg = 0;
+ int ret;
+
+ dir = stmfx_gpio_get_direction(&pctl->gpio_chip, pin);
+ if (dir < 0)
+ return dir;
+ type = stmfx_pinconf_get_type(pctl, pin);
+ if (type < 0)
+ return type;
+ pupd = stmfx_pinconf_get_pupd(pctl, pin);
+ if (pupd < 0)
+ return pupd;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ if (dir == GPIOF_DIR_OUT) {
+ if (type & pupd)
+ arg = 0;
+ else
+ arg = 1;
+ } else {
+ if (!type)
+ arg = 1;
+ }
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ if (dir == GPIOF_DIR_IN && type && !pupd)
+ arg = 1;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ if (type && pupd)
+ arg = 1;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ if ((dir == GPIOF_DIR_OUT && type) ||
+ (dir == GPIOF_DIR_IN && !type))
+ arg = 1;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ if ((dir == GPIOF_DIR_OUT && !type) ||
+ (dir == GPIOF_DIR_IN && type))
+ arg = 1;
+ break;
+ case PIN_CONFIG_OUTPUT:
+ if (dir == GPIOF_DIR_IN)
+ return -EINVAL;
+
+ ret = stmfx_gpio_get(&pctl->gpio_chip, pin);
+ if (ret < 0)
+ return ret;
+
+ arg = ret;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ *config = pinconf_to_config_packed(param, arg);
+
+ return 0;
+}
+
+static int stmfx_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+ unsigned long *configs, unsigned int num_configs)
+{
+ struct stmfx_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param;
+ u32 arg;
+ int dir, i, ret;
+
+ dir = stmfx_gpio_get_direction(&pctl->gpio_chip, pin);
+ if (dir < 0)
+ return dir;
+
+ 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_PULL_PIN_DEFAULT:
+ case PIN_CONFIG_BIAS_DISABLE:
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ ret = stmfx_pinconf_set_pupd(pctl, pin, 0);
+ if (ret)
+ return ret;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = stmfx_pinconf_set_pupd(pctl, pin, 1);
+ if (ret)
+ return ret;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ if (dir == GPIOF_DIR_OUT)
+ ret = stmfx_pinconf_set_type(pctl, pin, 1);
+ else
+ ret = stmfx_pinconf_set_type(pctl, pin, 0);
+ if (ret)
+ return ret;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ if (dir == GPIOF_DIR_OUT)
+ ret = stmfx_pinconf_set_type(pctl, pin, 0);
+ else
+ ret = stmfx_pinconf_set_type(pctl, pin, 1);
+ if (ret)
+ return ret;
+ break;
+ case PIN_CONFIG_OUTPUT:
+ ret = stmfx_gpio_direction_output(&pctl->gpio_chip,
+ pin, arg);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+ }
+
+ return 0;
+}
+
+static void stmfx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned int offset)
+{
+ struct stmfx_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+ int dir, type, pupd, val;
+
+ dir = stmfx_gpio_get_direction(&pctl->gpio_chip, offset);
+ if (dir < 0)
+ return;
+ type = stmfx_pinconf_get_type(pctl, offset);
+ if (type < 0)
+ return;
+ pupd = stmfx_pinconf_get_pupd(pctl, offset);
+ if (pupd < 0)
+ return;
+ val = stmfx_gpio_get(&pctl->gpio_chip, offset);
+ if (val < 0)
+ return;
+
+ if (dir == GPIOF_DIR_IN) {
+ seq_printf(s, "input %s ", val ? "high" : "low");
+ if (type)
+ seq_printf(s, "with internal pull-%s ",
+ pupd ? "up" : "down");
+ else
+ seq_printf(s, "%s ", pupd ? "floating" : "analog");
+ } else {
+ seq_printf(s, "output %s ", val ? "high" : "low");
+ if (type)
+ seq_printf(s, "open drain %s internal pull-up ",
+ pupd ? "with" : "without");
+ else
+ seq_puts(s, "push pull no pull ");
+ }
+}
+
+static const struct pinconf_ops stmfx_pinconf_ops = {
+ .pin_config_get = stmfx_pinconf_get,
+ .pin_config_set = stmfx_pinconf_set,
+ .pin_config_dbg_show = stmfx_pinconf_dbg_show,
+};
+
+static int stmfx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return 0;
+}
+
+static const char *stmfx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ return NULL;
+}
+
+static int stmfx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ return -ENOTSUPP;
+}
+
+static const struct pinctrl_ops stmfx_pinctrl_ops = {
+ .get_groups_count = stmfx_pinctrl_get_groups_count,
+ .get_group_name = stmfx_pinctrl_get_group_name,
+ .get_group_pins = stmfx_pinctrl_get_group_pins,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+static void stmfx_gpio_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
+ u32 reg = get_reg(data->hwirq);
+ u32 mask = get_mask(data->hwirq);
+
+ pctl->irq_gpi_src[reg] &= ~mask;
+}
+
+static void stmfx_gpio_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
+ u32 reg = get_reg(data->hwirq);
+ u32 mask = get_mask(data->hwirq);
+
+ pctl->irq_gpi_src[reg] |= mask;
+}
+
+static int stmfx_gpio_irq_set_type(struct irq_data *data,
+ unsigned int type)
+{
+ struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
+ u32 reg = get_reg(data->hwirq);
+ u32 mask = get_mask(data->hwirq);
+
+ if (type & IRQ_TYPE_NONE)
+ return -EINVAL;
+
+ if (type & IRQ_TYPE_EDGE_BOTH) {
+ pctl->irq_gpi_evt[reg] |= mask;
+ irq_set_handler_locked(data, handle_edge_irq);
+ } else {
+ pctl->irq_gpi_evt[reg] &= ~mask;
+ irq_set_handler_locked(data, handle_level_irq);
+ }
+
+ if ((type & IRQ_TYPE_EDGE_RISING) || (type & IRQ_TYPE_LEVEL_HIGH))
+ pctl->irq_gpi_type[reg] |= mask;
+ else
+ pctl->irq_gpi_type[reg] &= ~mask;
+
+ /*
+ * In case of (type & IRQ_TYPE_EDGE_BOTH), we need to know current
+ * GPIO value to set the right edge trigger. But in atomic context
+ * here we can't access registers over I2C. That's why (type &
+ * IRQ_TYPE_EDGE_BOTH) will be managed in .irq_sync_unlock.
+ */
+
+ if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
+ pctl->irq_toggle_edge[reg] |= mask;
+ else
+ pctl->irq_toggle_edge[reg] &= mask;
+
+ return 0;
+}
+
+static void stmfx_gpio_irq_bus_lock(struct irq_data *data)
+{
+ struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
+
+ mutex_lock(&pctl->lock);
+}
+
+static void stmfx_gpio_irq_bus_sync_unlock(struct irq_data *data)
+{
+ struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+ struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
+ u32 reg = get_reg(data->hwirq);
+ u32 mask = get_mask(data->hwirq);
+
+ /*
+ * In case of IRQ_TYPE_EDGE_BOTH), read the current GPIO value
+ * (this couldn't be done in .irq_set_type because of atomic context)
+ * to set the right irq trigger type.
+ */
+ if (pctl->irq_toggle_edge[reg] & mask) {
+ if (stmfx_gpio_get(gpio_chip, data->hwirq))
+ pctl->irq_gpi_type[reg] &= ~mask;
+ else
+ pctl->irq_gpi_type[reg] |= mask;
+ }
+
+ regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_EVT,
+ pctl->irq_gpi_evt, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_TYPE,
+ pctl->irq_gpi_type, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_SRC,
+ pctl->irq_gpi_src, NR_GPIO_REGS);
+
+ /*
+ * If at least one GPIO irq is enabled among the 24 available,
+ * enable global GPIO irq
+ */
+ if (*(u32 *)pctl->irq_gpi_src & GENMASK(23, 0))
+ regmap_write_bits(pctl->regmap, STMFX_REG_IRQ_SRC_EN,
+ STMFX_REG_IRQ_SRC_EN_GPIO,
+ STMFX_REG_IRQ_SRC_EN_GPIO);
+ else
+ regmap_write_bits(pctl->regmap, STMFX_REG_IRQ_SRC_EN,
+ STMFX_REG_IRQ_SRC_EN_GPIO, 0);
+
+ mutex_unlock(&pctl->lock);
+}
+
+static void stmfx_gpio_irq_toggle_trigger(struct stmfx_pinctrl *pctl,
+ unsigned int offset)
+{
+ u32 reg = get_reg(offset);
+ u32 mask = get_mask(offset);
+ int val;
+
+ if (!(pctl->irq_toggle_edge[reg] & mask))
+ return;
+
+ val = stmfx_gpio_get(&pctl->gpio_chip, offset);
+ if (val < 0)
+ return;
+
+ if (val) {
+ pctl->irq_gpi_type[reg] &= mask;
+ regmap_write_bits(pctl->regmap, STMFX_REG_IRQ_GPI_TYPE + reg,
+ get_mask(offset), 0);
+
+ } else {
+ pctl->irq_gpi_type[reg] |= mask;
+ regmap_write_bits(pctl->regmap, STMFX_REG_IRQ_GPI_TYPE + reg,
+ get_mask(offset), get_mask(offset));
+ }
+}
+
+static irqreturn_t stmfx_gpio_irq_thread_fn(int irq, void *dev_id)
+{
+ struct stmfx_pinctrl *pctl = (struct stmfx_pinctrl *)dev_id;
+ struct gpio_chip *gc = &pctl->gpio_chip;
+ u8 pending[NR_GPIO_REGS];
+ unsigned long n, status;
+ int ret;
+
+ ret = regmap_bulk_read(pctl->regmap, STMFX_REG_IRQ_GPI_PENDING,
+ &pending, NR_GPIO_REGS);
+ if (ret)
+ return IRQ_NONE;
+
+ ret = regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_ACK,
+ pending, NR_GPIO_REGS);
+ if (ret)
+ return IRQ_NONE;
+
+ status = *(unsigned long *)pending;
+ for_each_set_bit(n, &status, gc->ngpio) {
+ handle_nested_irq(irq_find_mapping(gc->irq.domain, n));
+ stmfx_gpio_irq_toggle_trigger(pctl, n);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int stmfx_gpio_irq_init(struct stmfx_pinctrl *pctl, int irq)
+{
+ u32 irqtrigger;
+ int ret;
+
+ irqtrigger = irq_get_trigger_type(irq);
+ ret = devm_request_threaded_irq(pctl->dev, irq, NULL,
+ stmfx_gpio_irq_thread_fn,
+ irqtrigger | IRQF_ONESHOT | IRQF_SHARED,
+ pctl->irq_chip.name, pctl);
+ if (ret) {
+ dev_err(pctl->dev, "cannot request irq%d\n", irq);
+ return ret;
+ }
+
+ pctl->irq_chip.name = "stmfxgpio";
+ pctl->irq_chip.irq_mask = stmfx_gpio_irq_mask;
+ pctl->irq_chip.irq_unmask = stmfx_gpio_irq_unmask;
+ pctl->irq_chip.irq_set_type = stmfx_gpio_irq_set_type;
+ pctl->irq_chip.irq_bus_lock = stmfx_gpio_irq_bus_lock;
+ pctl->irq_chip.irq_bus_sync_unlock = stmfx_gpio_irq_bus_sync_unlock;
+
+ ret = gpiochip_irqchip_add_nested(&pctl->gpio_chip, &pctl->irq_chip,
+ 0, handle_simple_irq, IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(pctl->dev, "cannot add irqchip to gpiochip\n");
+ return ret;
+ }
+
+ gpiochip_set_nested_irqchip(&pctl->gpio_chip, &pctl->irq_chip, irq);
+
+ return 0;
+}
+
+static int stmfx_gpio_function_enable(struct stmfx *stmfx, u32 npins)
+{
+ u32 mask = STMFX_REG_SYS_CTRL_GPIO_EN;
+
+ if (npins > 16)
+ mask += STMFX_REG_SYS_CTRL_ALTGPIO_EN;
+
+ return regmap_write_bits(stmfx->regmap, STMFX_REG_SYS_CTRL, mask, mask);
+}
+
+static int stmfx_gpio_init(struct stmfx *stmfx, struct device_node *np)
+{
+ struct stmfx_pinctrl *pctl;
+ int ret;
+
+ pctl = devm_kzalloc(stmfx->dev, sizeof(*pctl), GFP_KERNEL);
+ if (!pctl)
+ return -ENOMEM;
+
+ pctl->dev = stmfx->dev;
+ pctl->regmap = stmfx->regmap;
+ stmfx->pctl = pctl;
+
+ mutex_init(&pctl->lock);
+
+ /* Register pin controller */
+ pctl->pctl_desc.name = "stmfx-pinctrl";
+ pctl->pctl_desc.pctlops = &stmfx_pinctrl_ops;
+ pctl->pctl_desc.confops = &stmfx_pinconf_ops;
+ pctl->pctl_desc.pins = stmfx_pins;
+ pctl->pctl_desc.npins = ARRAY_SIZE(stmfx_pins);
+ pctl->pctl_desc.owner = THIS_MODULE;
+
+ ret = devm_pinctrl_register_and_init(pctl->dev, &pctl->pctl_desc,
+ pctl, &pctl->pctl_dev);
+ if (ret) {
+ dev_err(pctl->dev, "pinctrl registration failed\n");
+ return ret;
+ }
+
+ ret = pinctrl_enable(pctl->pctl_dev);
+ if (ret) {
+ dev_err(pctl->dev, "pinctrl enable failed\n");
+ return ret;
+ }
+
+ /* Register gpio controller */
+ pctl->gpio_chip.label = "stmfx-gpio";
+ pctl->gpio_chip.parent = pctl->dev;
+ pctl->gpio_chip.get_direction = stmfx_gpio_get_direction;
+ pctl->gpio_chip.direction_input = stmfx_gpio_direction_input;
+ pctl->gpio_chip.direction_output = stmfx_gpio_direction_output;
+ pctl->gpio_chip.get = stmfx_gpio_get;
+ pctl->gpio_chip.set = stmfx_gpio_set;
+ pctl->gpio_chip.set_config = gpiochip_generic_config;
+ pctl->gpio_chip.base = -1;
+ pctl->gpio_chip.ngpio = pctl->pctl_desc.npins;
+ pctl->gpio_chip.can_sleep = true;
+ pctl->gpio_chip.of_node = np;
+
+ ret = stmfx_gpio_irq_init(pctl, stmfx->irq);
+ if (ret)
+ return ret;
+
+ ret = devm_gpiochip_add_data(pctl->dev, &pctl->gpio_chip, pctl);
+ if (ret) {
+ dev_err(pctl->dev, "gpio_chip registration failed\n");
+ return ret;
+ }
+
+ if (!of_find_property(np, "gpio-ranges", NULL)) {
+ ret = gpiochip_add_pin_range(&pctl->gpio_chip,
+ dev_name(pctl->dev),
+ 0, 0, pctl->pctl_desc.npins);
+ if (ret)
+ return ret;
+ }
+
+ ret = stmfx_gpio_function_enable(stmfx, pctl->gpio_chip.ngpio);
+ if (ret)
+ return ret;
+
+ dev_info(pctl->dev, "%d GPIOs available\n", pctl->gpio_chip.ngpio);
+
+ return 0;
+}
+
+static int stmfx_irq_init(struct stmfx *stmfx)
+{
+ u32 irqoutpin = 0, irqtrigger;
+
+ if (stmfx->irq < 0) {
+ dev_err(stmfx->dev, "failed to get irq: %d\n", stmfx->irq);
+ return stmfx->irq;
+ }
+
+ if (!of_property_read_bool(stmfx->dev->of_node, "drive-open-drain"))
+ irqoutpin |= STMFX_REG_IRQ_OUT_PIN_TYPE;
+
+ irqtrigger = irq_get_trigger_type(stmfx->irq);
+ if ((irqtrigger & IRQ_TYPE_EDGE_RISING) ||
+ (irqtrigger & IRQ_TYPE_LEVEL_HIGH))
+ irqoutpin |= STMFX_REG_IRQ_OUT_PIN_POL;
+
+ return regmap_write(stmfx->regmap, STMFX_REG_IRQ_OUT_PIN, irqoutpin);
+}
+
+static int stmfx_chip_reset(struct stmfx *stmfx)
+{
+ int ret;
+
+ ret = regmap_update_bits(stmfx->regmap, STMFX_REG_SYS_CTRL,
+ STMFX_REG_SYS_CTRL_SWRST,
+ STMFX_REG_SYS_CTRL_SWRST);
+ if (ret)
+ return ret;
+
+ msleep(STMFX_BOOT_TIME_MS);
+
+ return ret;
+}
+
+static int stmfx_chip_init(struct stmfx *stmfx, struct i2c_client *client)
+{
+ u32 id;
+ u8 version[2];
+ int ret;
+
+ stmfx->vdd = devm_regulator_get_optional(stmfx->dev, "vdd");
+ if (IS_ERR(stmfx->vdd)) {
+ ret = PTR_ERR(stmfx->vdd);
+ if (ret != -ENODEV) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(stmfx->dev,
+ "no vdd regulator found:%d\n", ret);
+ return ret;
+ }
+ }
+
+ if (!IS_ERR(stmfx->vdd)) {
+ ret = regulator_enable(stmfx->vdd);
+ if (ret) {
+ dev_err(stmfx->dev, "vdd enable failed: %d\n", ret);
+ return ret;
+ }
+ }
+
+ ret = regmap_read(stmfx->regmap, STMFX_REG_CHIP_ID, &id);
+ if (ret) {
+ dev_err(stmfx->dev, "error reading chip id: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Check that ID is the complement of the I2C address:
+ * STMFX I2C address follows the 7-bit format (MSB), that's why
+ * client->addr is shifted.
+ *
+ * STMFX_I2C_ADDR| STMFX | Linux
+ * input pin | I2C device address | I2C device address
+ *---------------------------------------------------------
+ * 0 | b: 1000 010x h:0x84 | 0x42
+ * 1 | b: 1000 011x h:0x86 | 0x43
+ */
+ if (FIELD_GET(STMFX_REG_CHIP_ID_MASK, ~id) != (client->addr << 1)) {
+ dev_err(stmfx->dev, "unknown chip id: %#x\n", id);
+ return -EINVAL;
+ }
+
+ ret = regmap_bulk_read(stmfx->regmap, STMFX_REG_FW_VERSION_MSB,
+ version, ARRAY_SIZE(version));
+ if (ret) {
+ dev_err(stmfx->dev, "error reading fw version: %d\n", ret);
+ return ret;
+ }
+
+ dev_info(stmfx->dev, "STMFX id: %#x, fw version: %x.%02x\n",
+ id, version[0], version[1]);
+
+ return stmfx_chip_reset(stmfx);
+}
+
+static void stmfx_chip_exit(struct stmfx *stmfx)
+{
+ regmap_write(stmfx->regmap, STMFX_REG_IRQ_SRC_EN, 0);
+ regmap_write(stmfx->regmap, STMFX_REG_SYS_CTRL, 0);
+
+ if (!IS_ERR(stmfx->vdd))
+ regulator_disable(stmfx->vdd);
+}
+
+static const struct regmap_config stmfx_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int stmfx_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device_node *np = client->dev.of_node, *child;
+ struct stmfx *stmfx;
+ int ret;
+
+ stmfx = devm_kzalloc(&client->dev, sizeof(*stmfx), GFP_KERNEL);
+ if (!stmfx)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, stmfx);
+
+ stmfx->dev = &client->dev;
+
+ stmfx->regmap = devm_regmap_init_i2c(client, &stmfx_regmap_config);
+ if (IS_ERR(stmfx->regmap)) {
+ ret = PTR_ERR(stmfx->regmap);
+ dev_err(stmfx->dev,
+ "Failed to allocate register map: %d\n", ret);
+ return ret;
+ }
+
+ ret = stmfx_chip_init(stmfx, client);
+ if (ret) {
+ if (ret == -ETIMEDOUT)
+ return -EPROBE_DEFER;
+ return ret;
+ }
+
+ stmfx->irq = client->irq;
+ ret = stmfx_irq_init(stmfx);
+ if (ret)
+ return ret;
+
+ for_each_available_child_of_node(np, child) {
+ if (of_property_read_bool(child, "gpio-controller")) {
+ ret = stmfx_gpio_init(stmfx, child);
+ if (ret)
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ stmfx_chip_exit(stmfx);
+
+ return ret;
+}
+
+static int stmfx_remove(struct i2c_client *client)
+{
+ struct stmfx *stmfx = i2c_get_clientdata(client);
+
+ stmfx_chip_exit(stmfx);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static void stmfx_gpio_backup_regs(struct stmfx_pinctrl *pctl)
+{
+ regmap_bulk_read(pctl->regmap, STMFX_REG_GPIO_STATE,
+ &pctl->bkp_gpio_state, NR_GPIO_REGS);
+ regmap_bulk_read(pctl->regmap, STMFX_REG_GPIO_DIR,
+ &pctl->bkp_gpio_dir, NR_GPIO_REGS);
+ regmap_bulk_read(pctl->regmap, STMFX_REG_GPIO_TYPE,
+ &pctl->bkp_gpio_type, NR_GPIO_REGS);
+ regmap_bulk_read(pctl->regmap, STMFX_REG_GPIO_PUPD,
+ &pctl->bkp_gpio_pupd, NR_GPIO_REGS);
+}
+
+static void stmfx_gpio_restore_regs(struct stmfx_pinctrl *pctl)
+{
+ regmap_bulk_write(pctl->regmap, STMFX_REG_GPIO_STATE,
+ pctl->bkp_gpio_state, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_GPIO_DIR,
+ pctl->bkp_gpio_dir, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_GPIO_TYPE,
+ pctl->bkp_gpio_type, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_GPIO_PUPD,
+ pctl->bkp_gpio_pupd, NR_GPIO_REGS);
+
+ regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_EVT,
+ pctl->irq_gpi_evt, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_TYPE,
+ pctl->irq_gpi_type, NR_GPIO_REGS);
+ regmap_bulk_write(pctl->regmap, STMFX_REG_IRQ_GPI_SRC,
+ pctl->irq_gpi_src, NR_GPIO_REGS);
+
+ /*
+ * If at least one GPIO irq is enabled among the 24 available,
+ * enable global GPIO irq
+ */
+ if (*(u32 *)pctl->irq_gpi_src & GENMASK(23, 0))
+ regmap_write_bits(pctl->regmap, STMFX_REG_IRQ_SRC_EN,
+ STMFX_REG_IRQ_SRC_EN_GPIO,
+ STMFX_REG_IRQ_SRC_EN_GPIO);
+}
+
+static int stmfx_suspend(struct device *dev)
+{
+ struct stmfx *stmfx = dev_get_drvdata(dev);
+
+ stmfx_gpio_backup_regs(stmfx->pctl);
+
+ if (!IS_ERR(stmfx->vdd))
+ regulator_disable(stmfx->vdd);
+
+ return 0;
+}
+
+static int stmfx_resume(struct device *dev)
+{
+ struct stmfx *stmfx = dev_get_drvdata(dev);
+
+ if (!IS_ERR(stmfx->vdd))
+ regulator_enable(stmfx->vdd);
+
+ /* Restore IRQ_OUT_PIN register */
+ stmfx_irq_init(stmfx);
+
+ /* Restore SYS_CTRL register */
+ stmfx_gpio_function_enable(stmfx, stmfx->pctl->gpio_chip.ngpio);
+
+ /* Restore all GPIO expander function relative registers */
+ stmfx_gpio_restore_regs(stmfx->pctl);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(stmfx_dev_pm_ops, stmfx_suspend, stmfx_resume);
+
+static const struct of_device_id stmfx_of_match[] = {
+ { .compatible = "st,stmfx-0300", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, stmfx_of_match);
+
+static struct i2c_driver stmfx_driver = {
+ .driver = {
+ .name = "stmfx-pinctrl",
+ .of_match_table = of_match_ptr(stmfx_of_match),
+ .pm = &stmfx_dev_pm_ops,
+ },
+ .probe = stmfx_probe,
+ .remove = stmfx_remove,
+};
+module_i2c_driver(stmfx_driver);
+
+MODULE_DESCRIPTION("STMFX pinctrl/GPIO driver");
+MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@xxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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