+++ /dev/null
-From 576623d706613feec2392ef16b84e23a46200552 Mon Sep 17 00:00:00 2001
-From: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
-Date: Fri, 1 Mar 2024 14:29:24 +0100
-Subject: [PATCH] pinctrl: Add driver for Awinic AW9523/B I2C GPIO Expander
-
-The Awinic AW9523(B) is a multi-function I2C gpio expander in a
-TQFN-24L package, featuring PWM (max 37mA per pin, or total max
-power 3.2Watts) for LED driving capability.
-
-It has two ports with 8 pins per port (for a total of 16 pins),
-configurable as either PWM with 1/256 stepping or GPIO input/output,
-1.8V logic input; each GPIO can be configured as input or output
-independently from each other.
-
-This IC also has an internal interrupt controller, which is capable
-of generating an interrupt for each GPIO, depending on the
-configuration, and will raise an interrupt on the INTN pin to
-advertise this to an external interrupt controller.
-
-Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
-Signed-off-by: David Bauer <mail@david-bauer.net>
-Link: https://lore.kernel.org/r/20210624214458.68716-2-mail@david-bauer.net
-Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
-Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-Link: https://lore.kernel.org/r/20240301-awinic-aw9523-v8-1-7ec572f5dfb4@linaro.org
----
- drivers/pinctrl/Kconfig | 18 +
- drivers/pinctrl/Makefile | 1 +
- drivers/pinctrl/pinctrl-aw9523.c | 1118 ++++++++++++++++++++++++++++++
- 3 files changed, 1137 insertions(+)
- create mode 100644 drivers/pinctrl/pinctrl-aw9523.c
-
---- a/drivers/pinctrl/Kconfig
-+++ b/drivers/pinctrl/Kconfig
-@@ -127,6 +127,24 @@ config PINCTRL_AXP209
- selected.
- Say Y to enable pinctrl and GPIO support for the AXP209 PMIC.
-
-+config PINCTRL_AW9523
-+ bool "Awinic AW9523/AW9523B I2C GPIO expander pinctrl driver"
-+ depends on OF && I2C
-+ select PINMUX
-+ select PINCONF
-+ select GENERIC_PINCONF
-+ select GPIOLIB
-+ select GPIOLIB_IRQCHIP
-+ select REGMAP
-+ select REGMAP_I2C
-+ help
-+ The Awinic AW9523/AW9523B is a multi-function I2C GPIO
-+ expander with PWM functionality. This driver bundles a
-+ pinctrl driver to select the function muxing and a GPIO
-+ driver to handle GPIO, when the GPIO function is selected.
-+
-+ Say yes to enable pinctrl and GPIO support for the AW9523(B).
-+
- config PINCTRL_BM1880
- bool "Bitmain BM1880 Pinctrl driver"
- depends on OF && (ARCH_BITMAIN || COMPILE_TEST)
---- a/drivers/pinctrl/Makefile
-+++ b/drivers/pinctrl/Makefile
-@@ -15,6 +15,7 @@ obj-$(CONFIG_PINCTRL_ARTPEC6) += pinctrl
- obj-$(CONFIG_PINCTRL_AS3722) += pinctrl-as3722.o
- obj-$(CONFIG_PINCTRL_AT91) += pinctrl-at91.o
- obj-$(CONFIG_PINCTRL_AT91PIO4) += pinctrl-at91-pio4.o
-+obj-$(CONFIG_PINCTRL_AW9523) += pinctrl-aw9523.o
- obj-$(CONFIG_PINCTRL_AXP209) += pinctrl-axp209.o
- obj-$(CONFIG_PINCTRL_BM1880) += pinctrl-bm1880.o
- obj-$(CONFIG_PINCTRL_CY8C95X0) += pinctrl-cy8c95x0.o
---- /dev/null
-+++ b/drivers/pinctrl/pinctrl-aw9523.c
-@@ -0,0 +1,1118 @@
-+// SPDX-License-Identifier: GPL-2.0-only
-+/*
-+ * Awinic AW9523B i2c pin controller driver
-+ * Copyright (c) 2020, AngeloGioacchino Del Regno
-+ * <angelogioacchino.delregno@somainline.org>
-+ */
-+
-+#include <linux/bitfield.h>
-+#include <linux/gpio/consumer.h>
-+#include <linux/gpio/driver.h>
-+#include <linux/i2c.h>
-+#include <linux/init.h>
-+#include <linux/interrupt.h>
-+#include <linux/irq.h>
-+#include <linux/mutex.h>
-+#include <linux/module.h>
-+#include <linux/pinctrl/pinconf.h>
-+#include <linux/pinctrl/pinctrl.h>
-+#include <linux/pinctrl/pinmux.h>
-+#include <linux/pinctrl/pinconf-generic.h>
-+#include <linux/property.h>
-+#include <linux/regmap.h>
-+#include <linux/regulator/consumer.h>
-+#include <linux/slab.h>
-+
-+#define AW9523_MAX_FUNCS 2
-+#define AW9523_NUM_PORTS 2
-+#define AW9523_PINS_PER_PORT 8
-+
-+/*
-+ * HW needs at least 20uS for reset and at least 1-2uS to recover from
-+ * reset, but we have to account for eventual board quirks, if any:
-+ * for this reason, keep reset asserted for 50uS and wait for 20uS
-+ * to recover from the reset.
-+ */
-+#define AW9523_HW_RESET_US 50
-+#define AW9523_HW_RESET_RECOVERY_US 20
-+
-+/* Port 0: P0_0...P0_7 - Port 1: P1_0...P1_7 */
-+#define AW9523_PIN_TO_PORT(pin) (pin >> 3)
-+#define AW9523_REG_IN_STATE(pin) (0x00 + AW9523_PIN_TO_PORT(pin))
-+#define AW9523_REG_OUT_STATE(pin) (0x02 + AW9523_PIN_TO_PORT(pin))
-+#define AW9523_REG_CONF_STATE(pin) (0x04 + AW9523_PIN_TO_PORT(pin))
-+#define AW9523_REG_INTR_DIS(pin) (0x06 + AW9523_PIN_TO_PORT(pin))
-+#define AW9523_REG_CHIPID 0x10
-+#define AW9523_VAL_EXPECTED_CHIPID 0x23
-+
-+#define AW9523_REG_GCR 0x11
-+#define AW9523_GCR_ISEL_MASK GENMASK(0, 1)
-+#define AW9523_GCR_GPOMD_MASK BIT(4)
-+
-+#define AW9523_REG_PORT_MODE(pin) (0x12 + AW9523_PIN_TO_PORT(pin))
-+#define AW9523_REG_SOFT_RESET 0x7f
-+#define AW9523_VAL_RESET 0x00
-+
-+/*
-+ * struct aw9523_irq - Interrupt controller structure
-+ * @lock: mutex locking for the irq bus
-+ * @irqchip: structure holding irqchip params
-+ * @cached_gpio: stores the previous gpio status for bit comparison
-+ */
-+struct aw9523_irq {
-+ struct mutex lock;
-+ struct irq_chip *irqchip;
-+ u16 cached_gpio;
-+};
-+
-+/*
-+ * struct aw9523_pinmux - Pin mux params
-+ * @name: Name of the mux
-+ * @grps: Groups of the mux
-+ * @num_grps: Number of groups (sizeof array grps)
-+ */
-+struct aw9523_pinmux {
-+ const char *name;
-+ const char * const *grps;
-+ const u8 num_grps;
-+};
-+
-+/*
-+ * struct aw9523 - Main driver structure
-+ * @dev: device handle
-+ * @regmap: regmap handle for current device
-+ * @i2c_lock: Mutex lock for i2c operations
-+ * @reset_gpio: Hardware reset (RSTN) signal GPIO
-+ * @vio_vreg: VCC regulator (Optional)
-+ * @pctl: pinctrl handle for current device
-+ * @gpio: structure holding gpiochip params
-+ * @irq: Interrupt controller structure
-+ */
-+struct aw9523 {
-+ struct device *dev;
-+ struct regmap *regmap;
-+ struct mutex i2c_lock;
-+ struct gpio_desc *reset_gpio;
-+ struct regulator *vio_vreg;
-+ struct pinctrl_dev *pctl;
-+ struct gpio_chip gpio;
-+ struct aw9523_irq *irq;
-+};
-+
-+static const struct pinctrl_pin_desc aw9523_pins[] = {
-+ /* Port 0 */
-+ 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"),
-+
-+ /* Port 1 */
-+ 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"),
-+};
-+
-+static int aw9523_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
-+{
-+ return ARRAY_SIZE(aw9523_pins);
-+}
-+
-+static const char *aw9523_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
-+ unsigned int selector)
-+{
-+ return aw9523_pins[selector].name;
-+}
-+
-+static int aw9523_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
-+ unsigned int selector,
-+ const unsigned int **pins,
-+ unsigned int *num_pins)
-+{
-+ *pins = &aw9523_pins[selector].number;
-+ *num_pins = 1;
-+ return 0;
-+}
-+
-+static const struct pinctrl_ops aw9523_pinctrl_ops = {
-+ .get_groups_count = aw9523_pinctrl_get_groups_count,
-+ .get_group_pins = aw9523_pinctrl_get_group_pins,
-+ .get_group_name = aw9523_pinctrl_get_group_name,
-+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
-+ .dt_free_map = pinconf_generic_dt_free_map,
-+};
-+
-+static const char * const gpio_pwm_groups[] = {
-+ "gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5",
-+ "gpio6", "gpio7", "gpio8", "gpio9", "gpio10", "gpio11",
-+ "gpio12", "gpio13", "gpio14", "gpio15"
-+};
-+
-+/* Warning: Do NOT reorder this array */
-+static const struct aw9523_pinmux aw9523_pmx[] = {
-+ {
-+ .name = "pwm",
-+ .grps = gpio_pwm_groups,
-+ .num_grps = ARRAY_SIZE(gpio_pwm_groups),
-+ },
-+ {
-+ .name = "gpio",
-+ .grps = gpio_pwm_groups,
-+ .num_grps = ARRAY_SIZE(gpio_pwm_groups),
-+ },
-+};
-+
-+static int aw9523_pmx_get_funcs_count(struct pinctrl_dev *pctl)
-+{
-+ return ARRAY_SIZE(aw9523_pmx);
-+}
-+
-+static const char *aw9523_pmx_get_fname(struct pinctrl_dev *pctl,
-+ unsigned int sel)
-+{
-+ return aw9523_pmx[sel].name;
-+}
-+
-+static int aw9523_pmx_get_groups(struct pinctrl_dev *pctl, unsigned int sel,
-+ const char * const **groups,
-+ unsigned int * const num_groups)
-+{
-+ *groups = aw9523_pmx[sel].grps;
-+ *num_groups = aw9523_pmx[sel].num_grps;
-+ return 0;
-+}
-+
-+static int aw9523_pmx_set_mux(struct pinctrl_dev *pctl, unsigned int fsel,
-+ unsigned int grp)
-+{
-+ struct aw9523 *awi = pinctrl_dev_get_drvdata(pctl);
-+ int ret, pin = aw9523_pins[grp].number % AW9523_PINS_PER_PORT;
-+
-+ if (fsel >= ARRAY_SIZE(aw9523_pmx))
-+ return -EINVAL;
-+
-+ /*
-+ * This maps directly to the aw9523_pmx array: programming a
-+ * high bit means "gpio" and a low bit means "pwm".
-+ */
-+ mutex_lock(&awi->i2c_lock);
-+ ret = regmap_update_bits(awi->regmap, AW9523_REG_PORT_MODE(pin),
-+ BIT(pin), (fsel ? BIT(pin) : 0));
-+ mutex_unlock(&awi->i2c_lock);
-+ return ret;
-+}
-+
-+static const struct pinmux_ops aw9523_pinmux_ops = {
-+ .get_functions_count = aw9523_pmx_get_funcs_count,
-+ .get_function_name = aw9523_pmx_get_fname,
-+ .get_function_groups = aw9523_pmx_get_groups,
-+ .set_mux = aw9523_pmx_set_mux,
-+};
-+
-+static int aw9523_pcfg_param_to_reg(enum pin_config_param pcp, int pin, u8 *r)
-+{
-+ u8 reg;
-+
-+ switch (pcp) {
-+ case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
-+ case PIN_CONFIG_BIAS_PULL_DOWN:
-+ case PIN_CONFIG_BIAS_PULL_UP:
-+ reg = AW9523_REG_IN_STATE(pin);
-+ break;
-+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
-+ case PIN_CONFIG_DRIVE_PUSH_PULL:
-+ reg = AW9523_REG_GCR;
-+ break;
-+ case PIN_CONFIG_INPUT_ENABLE:
-+ case PIN_CONFIG_OUTPUT_ENABLE:
-+ reg = AW9523_REG_CONF_STATE(pin);
-+ break;
-+ case PIN_CONFIG_OUTPUT:
-+ reg = AW9523_REG_OUT_STATE(pin);
-+ break;
-+ default:
-+ return -EOPNOTSUPP;
-+ }
-+ *r = reg;
-+
-+ return 0;
-+}
-+
-+static int aw9523_pconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
-+ unsigned long *config)
-+{
-+ struct aw9523 *awi = pinctrl_dev_get_drvdata(pctldev);
-+ enum pin_config_param param = pinconf_to_config_param(*config);
-+ int regbit = pin % AW9523_PINS_PER_PORT;
-+ unsigned int val;
-+ u8 reg;
-+ int rc;
-+
-+ rc = aw9523_pcfg_param_to_reg(param, pin, ®);
-+ if (rc)
-+ return rc;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ rc = regmap_read(awi->regmap, reg, &val);
-+ mutex_unlock(&awi->i2c_lock);
-+ if (rc)
-+ return rc;
-+
-+ switch (param) {
-+ case PIN_CONFIG_BIAS_PULL_UP:
-+ case PIN_CONFIG_INPUT_ENABLE:
-+ case PIN_CONFIG_OUTPUT:
-+ val &= BIT(regbit);
-+ break;
-+ case PIN_CONFIG_BIAS_PULL_DOWN:
-+ case PIN_CONFIG_OUTPUT_ENABLE:
-+ val &= BIT(regbit);
-+ val = !val;
-+ break;
-+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
-+ if (pin >= AW9523_PINS_PER_PORT)
-+ val = 0;
-+ else
-+ val = !FIELD_GET(AW9523_GCR_GPOMD_MASK, val);
-+ break;
-+ case PIN_CONFIG_DRIVE_PUSH_PULL:
-+ if (pin >= AW9523_PINS_PER_PORT)
-+ val = 1;
-+ else
-+ val = FIELD_GET(AW9523_GCR_GPOMD_MASK, val);
-+ break;
-+ default:
-+ return -EOPNOTSUPP;
-+ }
-+ if (val < 1)
-+ return -EINVAL;
-+
-+ *config = pinconf_to_config_packed(param, !!val);
-+
-+ return rc;
-+}
-+
-+static int aw9523_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
-+ unsigned long *configs, unsigned int num_configs)
-+{
-+ struct aw9523 *awi = pinctrl_dev_get_drvdata(pctldev);
-+ enum pin_config_param param;
-+ int regbit = pin % AW9523_PINS_PER_PORT;
-+ u32 arg;
-+ u8 reg;
-+ unsigned int mask, val;
-+ int i, rc;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ for (i = 0; i < num_configs; i++) {
-+ param = pinconf_to_config_param(configs[i]);
-+ arg = pinconf_to_config_argument(configs[i]);
-+
-+ rc = aw9523_pcfg_param_to_reg(param, pin, ®);
-+ if (rc)
-+ goto end;
-+
-+ switch (param) {
-+ case PIN_CONFIG_OUTPUT:
-+ /* First, enable pin output */
-+ rc = regmap_update_bits(awi->regmap,
-+ AW9523_REG_CONF_STATE(pin),
-+ BIT(regbit), 0);
-+ if (rc)
-+ goto end;
-+
-+ /* Then, fall through to config output level */
-+ fallthrough;
-+ case PIN_CONFIG_OUTPUT_ENABLE:
-+ arg = !arg;
-+ fallthrough;
-+ case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
-+ case PIN_CONFIG_BIAS_PULL_DOWN:
-+ case PIN_CONFIG_BIAS_PULL_UP:
-+ case PIN_CONFIG_INPUT_ENABLE:
-+ mask = BIT(regbit);
-+ val = arg ? BIT(regbit) : 0;
-+ break;
-+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
-+ /* Open-Drain is supported only on port 0 */
-+ if (pin >= AW9523_PINS_PER_PORT) {
-+ rc = -EOPNOTSUPP;
-+ goto end;
-+ }
-+ mask = AW9523_GCR_GPOMD_MASK;
-+ val = 0;
-+ break;
-+ case PIN_CONFIG_DRIVE_PUSH_PULL:
-+ /* Port 1 is always Push-Pull */
-+ if (pin >= AW9523_PINS_PER_PORT) {
-+ mask = 0;
-+ val = 0;
-+ continue;
-+ }
-+ mask = AW9523_GCR_GPOMD_MASK;
-+ val = AW9523_GCR_GPOMD_MASK;
-+ break;
-+ default:
-+ rc = -EOPNOTSUPP;
-+ goto end;
-+ }
-+
-+ rc = regmap_update_bits(awi->regmap, reg, mask, val);
-+ if (rc)
-+ goto end;
-+ }
-+end:
-+ mutex_unlock(&awi->i2c_lock);
-+ return rc;
-+}
-+
-+static const struct pinconf_ops aw9523_pinconf_ops = {
-+ .pin_config_get = aw9523_pconf_get,
-+ .pin_config_set = aw9523_pconf_set,
-+ .is_generic = true,
-+};
-+
-+/*
-+ * aw9523_get_pin_direction - Get pin direction
-+ * @regmap: Regmap structure
-+ * @pin: gpiolib pin number
-+ * @n: pin index in port register
-+ *
-+ * Return: Pin direction for success or negative number for error
-+ */
-+static int aw9523_get_pin_direction(struct regmap *regmap, u8 pin, u8 n)
-+{
-+ int ret;
-+
-+ ret = regmap_test_bits(regmap, AW9523_REG_CONF_STATE(pin), BIT(n));
-+ if (ret < 0)
-+ return ret;
-+
-+ return ret ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
-+}
-+
-+/*
-+ * aw9523_get_port_state - Get input or output state for entire port
-+ * @regmap: Regmap structure
-+ * @pin: gpiolib pin number
-+ * @regbit: hw pin index, used to retrieve port number
-+ * @state: returned port state
-+ *
-+ * Return: Zero for success or negative number for error
-+ */
-+static int aw9523_get_port_state(struct regmap *regmap, u8 pin,
-+ u8 regbit, unsigned int *state)
-+{
-+ u8 reg;
-+ int dir;
-+
-+ dir = aw9523_get_pin_direction(regmap, pin, regbit);
-+ if (dir < 0)
-+ return dir;
-+
-+ if (dir == GPIO_LINE_DIRECTION_IN)
-+ reg = AW9523_REG_IN_STATE(pin);
-+ else
-+ reg = AW9523_REG_OUT_STATE(pin);
-+
-+ return regmap_read(regmap, reg, state);
-+}
-+
-+static int aw9523_gpio_irq_type(struct irq_data *d, unsigned int type)
-+{
-+ switch (type) {
-+ case IRQ_TYPE_NONE:
-+ case IRQ_TYPE_EDGE_BOTH:
-+ return 0;
-+ default:
-+ return -EINVAL;
-+ };
-+}
-+
-+/*
-+ * aw9523_irq_mask - Mask interrupt
-+ * @d: irq data
-+ *
-+ * Sets which interrupt to mask in the bitmap;
-+ * The interrupt will be masked when unlocking the irq bus.
-+ */
-+static void aw9523_irq_mask(struct irq_data *d)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-+ unsigned int n = d->hwirq % AW9523_PINS_PER_PORT;
-+
-+ regmap_update_bits(awi->regmap,
-+ AW9523_REG_INTR_DIS(d->hwirq),
-+ BIT(n), BIT(n));
-+ gpiochip_disable_irq(&awi->gpio, irqd_to_hwirq(d));
-+}
-+
-+/*
-+ * aw9523_irq_unmask - Unmask interrupt
-+ * @d: irq data
-+ *
-+ * Sets which interrupt to unmask in the bitmap;
-+ * The interrupt will be masked when unlocking the irq bus.
-+ */
-+static void aw9523_irq_unmask(struct irq_data *d)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-+ unsigned int n = d->hwirq % AW9523_PINS_PER_PORT;
-+
-+ gpiochip_enable_irq(&awi->gpio, irqd_to_hwirq(d));
-+ regmap_update_bits(awi->regmap,
-+ AW9523_REG_INTR_DIS(d->hwirq),
-+ BIT(n), 0);
-+}
-+
-+static irqreturn_t aw9523_irq_thread_func(int irq, void *dev_id)
-+{
-+ struct aw9523 *awi = (struct aw9523 *)dev_id;
-+ unsigned long n, val = 0;
-+ unsigned long changed_gpio;
-+ unsigned int tmp, port_pin, i, ret;
-+
-+ for (i = 0; i < AW9523_NUM_PORTS; i++) {
-+ port_pin = i * AW9523_PINS_PER_PORT;
-+ ret = regmap_read(awi->regmap,
-+ AW9523_REG_IN_STATE(port_pin),
-+ &tmp);
-+ if (ret)
-+ return ret;
-+ val |= (u8)tmp << (i * 8);
-+ }
-+
-+ /* Handle GPIO input release interrupt as well */
-+ changed_gpio = awi->irq->cached_gpio ^ val;
-+ awi->irq->cached_gpio = val;
-+
-+ /*
-+ * To avoid up to four *slow* i2c reads from any driver hooked
-+ * up to our interrupts, just check for the irq_find_mapping
-+ * result: if the interrupt is not mapped, then we don't want
-+ * to care about it.
-+ */
-+ for_each_set_bit(n, &changed_gpio, awi->gpio.ngpio) {
-+ tmp = irq_find_mapping(awi->gpio.irq.domain, n);
-+ if (tmp <= 0)
-+ continue;
-+ handle_nested_irq(tmp);
-+ }
-+
-+ return IRQ_HANDLED;
-+}
-+
-+/*
-+ * aw9523_irq_bus_lock - Grab lock for interrupt operation
-+ * @d: irq data
-+ */
-+static void aw9523_irq_bus_lock(struct irq_data *d)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-+
-+ mutex_lock(&awi->irq->lock);
-+ regcache_cache_only(awi->regmap, true);
-+}
-+
-+/*
-+ * aw9523_irq_bus_sync_unlock - Synchronize state and unlock
-+ * @d: irq data
-+ *
-+ * Writes the interrupt mask bits (found in the bit map) to the
-+ * hardware, then unlocks the bus.
-+ */
-+static void aw9523_irq_bus_sync_unlock(struct irq_data *d)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-+
-+ regcache_cache_only(awi->regmap, false);
-+ regcache_sync(awi->regmap);
-+ mutex_unlock(&awi->irq->lock);
-+}
-+
-+static int aw9523_gpio_get_direction(struct gpio_chip *chip,
-+ unsigned int offset)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 regbit = offset % AW9523_PINS_PER_PORT;
-+ int ret;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ ret = aw9523_get_pin_direction(awi->regmap, offset, regbit);
-+ mutex_unlock(&awi->i2c_lock);
-+
-+ return ret;
-+}
-+
-+static int aw9523_gpio_get(struct gpio_chip *chip, unsigned int offset)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 regbit = offset % AW9523_PINS_PER_PORT;
-+ unsigned int val;
-+ int ret;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ ret = aw9523_get_port_state(awi->regmap, offset, regbit, &val);
-+ mutex_unlock(&awi->i2c_lock);
-+ if (ret)
-+ return ret;
-+
-+ return !!(val & BIT(regbit));
-+}
-+
-+/**
-+ * _aw9523_gpio_get_multiple - Get I/O state for an entire port
-+ * @regmap: Regmap structure
-+ * @pin: gpiolib pin number
-+ * @regbit: hw pin index, used to retrieve port number
-+ * @state: returned port I/O state
-+ *
-+ * Return: Zero for success or negative number for error
-+ */
-+static int _aw9523_gpio_get_multiple(struct aw9523 *awi, u8 regbit,
-+ u8 *state, u8 mask)
-+{
-+ u32 dir_in, val;
-+ u8 m;
-+ int ret;
-+
-+ /* Registers are 8-bits wide */
-+ ret = regmap_read(awi->regmap, AW9523_REG_CONF_STATE(regbit), &dir_in);
-+ if (ret)
-+ return ret;
-+ *state = 0;
-+
-+ m = mask & dir_in;
-+ if (m) {
-+ ret = regmap_read(awi->regmap, AW9523_REG_IN_STATE(regbit),
-+ &val);
-+ if (ret)
-+ return ret;
-+ *state |= (u8)val & m;
-+ }
-+
-+ m = mask & ~dir_in;
-+ if (m) {
-+ ret = regmap_read(awi->regmap, AW9523_REG_OUT_STATE(regbit),
-+ &val);
-+ if (ret)
-+ return ret;
-+ *state |= (u8)val & m;
-+ }
-+
-+ return 0;
-+}
-+
-+static int aw9523_gpio_get_multiple(struct gpio_chip *chip,
-+ unsigned long *mask,
-+ unsigned long *bits)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 m, state = 0;
-+ int ret;
-+
-+ mutex_lock(&awi->i2c_lock);
-+
-+ /* Port 0 (gpio 0-7) */
-+ m = *mask & U8_MAX;
-+ if (m) {
-+ ret = _aw9523_gpio_get_multiple(awi, 0, &state, m);
-+ if (ret)
-+ goto out;
-+ }
-+ *bits = state;
-+
-+ /* Port 1 (gpio 8-15) */
-+ m = (*mask >> 8) & U8_MAX;
-+ if (m) {
-+ ret = _aw9523_gpio_get_multiple(awi, AW9523_PINS_PER_PORT,
-+ &state, m);
-+ if (ret)
-+ goto out;
-+
-+ *bits |= (state << 8);
-+ }
-+out:
-+ mutex_unlock(&awi->i2c_lock);
-+ return ret;
-+}
-+
-+static void aw9523_gpio_set_multiple(struct gpio_chip *chip,
-+ unsigned long *mask,
-+ unsigned long *bits)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 mask_lo, mask_hi, bits_lo, bits_hi;
-+ unsigned int reg;
-+ int ret = 0;
-+
-+ mask_lo = *mask & U8_MAX;
-+ mask_hi = (*mask >> 8) & U8_MAX;
-+ mutex_lock(&awi->i2c_lock);
-+ if (mask_hi) {
-+ reg = AW9523_REG_OUT_STATE(AW9523_PINS_PER_PORT);
-+ bits_hi = (*bits >> 8) & U8_MAX;
-+
-+ ret = regmap_write_bits(awi->regmap, reg, mask_hi, bits_hi);
-+ if (ret) {
-+ dev_warn(awi->dev, "Cannot write port1 out level\n");
-+ goto out;
-+ }
-+ }
-+ if (mask_lo) {
-+ reg = AW9523_REG_OUT_STATE(0);
-+ bits_lo = *bits & U8_MAX;
-+ ret = regmap_write_bits(awi->regmap, reg, mask_lo, bits_lo);
-+ if (ret)
-+ dev_warn(awi->dev, "Cannot write port0 out level\n");
-+ }
-+out:
-+ mutex_unlock(&awi->i2c_lock);
-+}
-+
-+static void aw9523_gpio_set(struct gpio_chip *chip,
-+ unsigned int offset, int value)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 regbit = offset % AW9523_PINS_PER_PORT;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ regmap_update_bits(awi->regmap, AW9523_REG_OUT_STATE(offset),
-+ BIT(regbit), value ? BIT(regbit) : 0);
-+ mutex_unlock(&awi->i2c_lock);
-+}
-+
-+
-+static int aw9523_direction_input(struct gpio_chip *chip, unsigned int offset)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 regbit = offset % AW9523_PINS_PER_PORT;
-+ int ret;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ ret = regmap_update_bits(awi->regmap, AW9523_REG_CONF_STATE(offset),
-+ BIT(regbit), BIT(regbit));
-+ mutex_unlock(&awi->i2c_lock);
-+
-+ return ret;
-+}
-+
-+static int aw9523_direction_output(struct gpio_chip *chip,
-+ unsigned int offset, int value)
-+{
-+ struct aw9523 *awi = gpiochip_get_data(chip);
-+ u8 regbit = offset % AW9523_PINS_PER_PORT;
-+ int ret;
-+
-+ mutex_lock(&awi->i2c_lock);
-+ ret = regmap_update_bits(awi->regmap, AW9523_REG_OUT_STATE(offset),
-+ BIT(regbit), value ? BIT(regbit) : 0);
-+ if (ret)
-+ goto end;
-+
-+ ret = regmap_update_bits(awi->regmap, AW9523_REG_CONF_STATE(offset),
-+ BIT(regbit), 0);
-+end:
-+ mutex_unlock(&awi->i2c_lock);
-+ return ret;
-+}
-+
-+static int aw9523_drive_reset_gpio(struct aw9523 *awi)
-+{
-+ unsigned int chip_id;
-+ int ret;
-+
-+ /*
-+ * If the chip is already configured for any reason, then we
-+ * will probably succeed in sending the soft reset signal to
-+ * the hardware through I2C: this operation takes less time
-+ * compared to a full HW reset and it gives the same results.
-+ */
-+ ret = regmap_write(awi->regmap, AW9523_REG_SOFT_RESET, 0);
-+ if (ret == 0)
-+ goto done;
-+
-+ dev_dbg(awi->dev, "Cannot execute soft reset: trying hard reset\n");
-+ ret = gpiod_direction_output(awi->reset_gpio, 0);
-+ if (ret)
-+ return ret;
-+
-+ /* The reset pulse has to be longer than 20uS due to deglitch */
-+ usleep_range(AW9523_HW_RESET_US, AW9523_HW_RESET_US + 1);
-+
-+ ret = gpiod_direction_output(awi->reset_gpio, 1);
-+ if (ret)
-+ return ret;
-+done:
-+ /* The HW needs at least 1uS to reliably recover after reset */
-+ usleep_range(AW9523_HW_RESET_RECOVERY_US,
-+ AW9523_HW_RESET_RECOVERY_US + 1);
-+
-+ /* Check the ChipID */
-+ ret = regmap_read(awi->regmap, AW9523_REG_CHIPID, &chip_id);
-+ if (ret) {
-+ dev_err(awi->dev, "Cannot read Chip ID: %d\n", ret);
-+ return ret;
-+ }
-+ if (chip_id != AW9523_VAL_EXPECTED_CHIPID) {
-+ dev_err(awi->dev, "Bad ChipID; read 0x%x, expected 0x%x\n",
-+ chip_id, AW9523_VAL_EXPECTED_CHIPID);
-+ return -EINVAL;
-+ }
-+
-+ return 0;
-+}
-+
-+static int aw9523_hw_reset(struct aw9523 *awi)
-+{
-+ int ret, max_retries = 2;
-+
-+ /* Sometimes the chip needs more than one reset cycle */
-+ do {
-+ ret = aw9523_drive_reset_gpio(awi);
-+ if (ret == 0)
-+ break;
-+ max_retries--;
-+ } while (max_retries);
-+
-+ return ret;
-+}
-+
-+static int aw9523_init_gpiochip(struct aw9523 *awi, unsigned int npins)
-+{
-+ struct device *dev = awi->dev;
-+ struct gpio_chip *gc = &awi->gpio;
-+
-+ gc->label = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
-+ if (!gc->label)
-+ return -ENOMEM;
-+
-+ gc->base = -1;
-+ gc->ngpio = npins;
-+ gc->get_direction = aw9523_gpio_get_direction;
-+ gc->direction_input = aw9523_direction_input;
-+ gc->direction_output = aw9523_direction_output;
-+ gc->get = aw9523_gpio_get;
-+ gc->get_multiple = aw9523_gpio_get_multiple;
-+ gc->set = aw9523_gpio_set;
-+ gc->set_multiple = aw9523_gpio_set_multiple;
-+ gc->set_config = gpiochip_generic_config;
-+ gc->parent = dev;
-+ gc->owner = THIS_MODULE;
-+ gc->can_sleep = false;
-+
-+ return 0;
-+}
-+
-+static const struct irq_chip aw9523_irq_chip = {
-+ .name = "aw9523",
-+ .irq_mask = aw9523_irq_mask,
-+ .irq_unmask = aw9523_irq_unmask,
-+ .irq_bus_lock = aw9523_irq_bus_lock,
-+ .irq_bus_sync_unlock = aw9523_irq_bus_sync_unlock,
-+ .irq_set_type = aw9523_gpio_irq_type,
-+ .flags = IRQCHIP_IMMUTABLE,
-+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
-+};
-+
-+static int aw9523_init_irq(struct aw9523 *awi, int irq)
-+{
-+ struct device *dev = awi->dev;
-+ struct gpio_irq_chip *girq;
-+ struct irq_chip *irqchip;
-+ int ret;
-+
-+ if (!device_property_read_bool(dev, "interrupt-controller"))
-+ return 0;
-+
-+ irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
-+ if (!irqchip)
-+ return -ENOMEM;
-+
-+ awi->irq = devm_kzalloc(dev, sizeof(*awi->irq), GFP_KERNEL);
-+ if (!awi->irq)
-+ return -ENOMEM;
-+
-+ awi->irq->irqchip = irqchip;
-+ mutex_init(&awi->irq->lock);
-+
-+ ret = devm_request_threaded_irq(dev, irq, NULL, aw9523_irq_thread_func,
-+ IRQF_ONESHOT, dev_name(dev), awi);
-+ if (ret) {
-+ dev_err(dev, "Failed to request irq %d\n", irq);
-+ return ret;
-+ }
-+
-+ girq = &awi->gpio.irq;
-+ gpio_irq_chip_set_chip(girq, &aw9523_irq_chip);
-+ girq->parent_handler = NULL;
-+ girq->num_parents = 0;
-+ girq->parents = NULL;
-+ girq->default_type = IRQ_TYPE_EDGE_BOTH;
-+ girq->handler = handle_simple_irq;
-+ girq->threaded = true;
-+
-+ return 0;
-+}
-+
-+static bool aw9523_is_reg_hole(unsigned int reg)
-+{
-+ return (reg > AW9523_REG_PORT_MODE(AW9523_PINS_PER_PORT) &&
-+ reg < AW9523_REG_SOFT_RESET) ||
-+ (reg > AW9523_REG_INTR_DIS(AW9523_PINS_PER_PORT) &&
-+ reg < AW9523_REG_CHIPID);
-+}
-+
-+static bool aw9523_readable_reg(struct device *dev, unsigned int reg)
-+{
-+ /* All available registers (minus holes) can be read */
-+ return !aw9523_is_reg_hole(reg);
-+}
-+
-+static bool aw9523_volatile_reg(struct device *dev, unsigned int reg)
-+{
-+ return aw9523_is_reg_hole(reg) ||
-+ reg == AW9523_REG_IN_STATE(0) ||
-+ reg == AW9523_REG_IN_STATE(AW9523_PINS_PER_PORT) ||
-+ reg == AW9523_REG_CHIPID ||
-+ reg == AW9523_REG_SOFT_RESET;
-+}
-+
-+static bool aw9523_writeable_reg(struct device *dev, unsigned int reg)
-+{
-+ return !aw9523_is_reg_hole(reg) && reg != AW9523_REG_CHIPID;
-+}
-+
-+static bool aw9523_precious_reg(struct device *dev, unsigned int reg)
-+{
-+ /* Reading AW9523_REG_IN_STATE clears interrupt status */
-+ return aw9523_is_reg_hole(reg) ||
-+ reg == AW9523_REG_IN_STATE(0) ||
-+ reg == AW9523_REG_IN_STATE(AW9523_PINS_PER_PORT);
-+}
-+
-+static const struct regmap_config aw9523_regmap = {
-+ .reg_bits = 8,
-+ .val_bits = 8,
-+ .reg_stride = 1,
-+
-+ .precious_reg = aw9523_precious_reg,
-+ .readable_reg = aw9523_readable_reg,
-+ .volatile_reg = aw9523_volatile_reg,
-+ .writeable_reg = aw9523_writeable_reg,
-+
-+ .cache_type = REGCACHE_FLAT,
-+ .disable_locking = true,
-+
-+ .num_reg_defaults_raw = AW9523_REG_SOFT_RESET,
-+};
-+
-+static int aw9523_hw_init(struct aw9523 *awi)
-+{
-+ u8 p1_pin = AW9523_PINS_PER_PORT;
-+ unsigned int val;
-+ int ret;
-+
-+ /* No register caching during initialization */
-+ regcache_cache_bypass(awi->regmap, true);
-+
-+ /* Bring up the chip */
-+ ret = aw9523_hw_reset(awi);
-+ if (ret) {
-+ dev_err(awi->dev, "HW Reset failed: %d\n", ret);
-+ return ret;
-+ }
-+
-+ /*
-+ * This is the expected chip and it is running: it's time to
-+ * set a safe default configuration in case the user doesn't
-+ * configure (all of the available) pins in this chip.
-+ * P.S.: The writes order doesn't matter.
-+ */
-+
-+ /* Set all pins as GPIO */
-+ ret = regmap_write(awi->regmap, AW9523_REG_PORT_MODE(0), U8_MAX);
-+ if (ret)
-+ return ret;
-+ ret = regmap_write(awi->regmap, AW9523_REG_PORT_MODE(p1_pin), U8_MAX);
-+ if (ret)
-+ return ret;
-+
-+ /* Set Open-Drain mode on Port 0 (Port 1 is always P-P) */
-+ ret = regmap_write(awi->regmap, AW9523_REG_GCR, 0);
-+ if (ret)
-+ return ret;
-+
-+ /* Set all pins as inputs */
-+ ret = regmap_write(awi->regmap, AW9523_REG_CONF_STATE(0), U8_MAX);
-+ if (ret)
-+ return ret;
-+ ret = regmap_write(awi->regmap, AW9523_REG_CONF_STATE(p1_pin), U8_MAX);
-+ if (ret)
-+ return ret;
-+
-+ /* Disable all interrupts to avoid unreasoned wakeups */
-+ ret = regmap_write(awi->regmap, AW9523_REG_INTR_DIS(0), U8_MAX);
-+ if (ret)
-+ return ret;
-+ ret = regmap_write(awi->regmap, AW9523_REG_INTR_DIS(p1_pin), U8_MAX);
-+ if (ret)
-+ return ret;
-+
-+ /* Clear setup-generated interrupts by performing a port state read */
-+ ret = aw9523_get_port_state(awi->regmap, 0, 0, &val);
-+ if (ret)
-+ return ret;
-+ ret = aw9523_get_port_state(awi->regmap, p1_pin, 0, &val);
-+ if (ret)
-+ return ret;
-+
-+ /* Everything went fine: activate and reinitialize register cache */
-+ regcache_cache_bypass(awi->regmap, false);
-+ return regmap_reinit_cache(awi->regmap, &aw9523_regmap);
-+}
-+
-+static int aw9523_probe(struct i2c_client *client)
-+{
-+ struct device *dev = &client->dev;
-+ struct pinctrl_desc *pdesc;
-+ struct aw9523 *awi;
-+ int ret;
-+
-+ awi = devm_kzalloc(dev, sizeof(*awi), GFP_KERNEL);
-+ if (!awi)
-+ return -ENOMEM;
-+
-+ i2c_set_clientdata(client, awi);
-+
-+ awi->dev = dev;
-+ awi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
-+ if (IS_ERR(awi->reset_gpio))
-+ return PTR_ERR(awi->reset_gpio);
-+ gpiod_set_consumer_name(awi->reset_gpio, "aw9523 reset");
-+
-+ awi->regmap = devm_regmap_init_i2c(client, &aw9523_regmap);
-+ if (IS_ERR(awi->regmap))
-+ return PTR_ERR(awi->regmap);
-+
-+ awi->vio_vreg = devm_regulator_get_optional(dev, "vio");
-+ if (IS_ERR(awi->vio_vreg)) {
-+ if (PTR_ERR(awi->vio_vreg) == -EPROBE_DEFER)
-+ return -EPROBE_DEFER;
-+ awi->vio_vreg = NULL;
-+ } else {
-+ ret = regulator_enable(awi->vio_vreg);
-+ if (ret)
-+ return ret;
-+ }
-+
-+ mutex_init(&awi->i2c_lock);
-+ lockdep_set_subclass(&awi->i2c_lock,
-+ i2c_adapter_depth(client->adapter));
-+
-+ pdesc = devm_kzalloc(dev, sizeof(*pdesc), GFP_KERNEL);
-+ if (!pdesc)
-+ return -ENOMEM;
-+
-+ ret = aw9523_hw_init(awi);
-+ if (ret)
-+ goto err_disable_vregs;
-+
-+ pdesc->name = dev_name(dev);
-+ pdesc->owner = THIS_MODULE;
-+ pdesc->pctlops = &aw9523_pinctrl_ops;
-+ pdesc->pmxops = &aw9523_pinmux_ops;
-+ pdesc->confops = &aw9523_pinconf_ops;
-+ pdesc->pins = aw9523_pins;
-+ pdesc->npins = ARRAY_SIZE(aw9523_pins);
-+
-+ ret = aw9523_init_gpiochip(awi, pdesc->npins);
-+ if (ret)
-+ goto err_disable_vregs;
-+
-+ if (client->irq) {
-+ ret = aw9523_init_irq(awi, client->irq);
-+ if (ret)
-+ goto err_disable_vregs;
-+ }
-+
-+ awi->pctl = devm_pinctrl_register(dev, pdesc, awi);
-+ if (IS_ERR(awi->pctl)) {
-+ ret = PTR_ERR(awi->pctl);
-+ dev_err(dev, "Cannot register pinctrl: %d", ret);
-+ goto err_disable_vregs;
-+ }
-+
-+ ret = devm_gpiochip_add_data(dev, &awi->gpio, awi);
-+ if (ret)
-+ goto err_disable_vregs;
-+
-+ return ret;
-+
-+err_disable_vregs:
-+ if (awi->vio_vreg)
-+ regulator_disable(awi->vio_vreg);
-+ mutex_destroy(&awi->i2c_lock);
-+ return ret;
-+}
-+
-+static void aw9523_remove(struct i2c_client *client)
-+{
-+ struct aw9523 *awi = i2c_get_clientdata(client);
-+ int ret;
-+
-+ if (!awi)
-+ return;
-+
-+ /*
-+ * If the chip VIO is connected to a regulator that we can turn
-+ * off, life is easy... otherwise, reinitialize the chip and
-+ * set the pins to hardware defaults before removing the driver
-+ * to leave it in a clean, safe and predictable state.
-+ */
-+ if (awi->vio_vreg) {
-+ regulator_disable(awi->vio_vreg);
-+ } else {
-+ mutex_lock(&awi->i2c_lock);
-+ ret = aw9523_hw_init(awi);
-+ mutex_unlock(&awi->i2c_lock);
-+ if (ret)
-+ return;
-+ }
-+
-+ mutex_destroy(&awi->i2c_lock);
-+}
-+
-+static const struct i2c_device_id aw9523_i2c_id_table[] = {
-+ { "aw9523_i2c", 0 },
-+ { }
-+};
-+MODULE_DEVICE_TABLE(i2c, aw9523_i2c_id_table);
-+
-+static const struct of_device_id of_aw9523_i2c_match[] = {
-+ { .compatible = "awinic,aw9523-pinctrl", },
-+};
-+MODULE_DEVICE_TABLE(of, of_aw9523_i2c_match);
-+
-+static struct i2c_driver aw9523_driver = {
-+ .driver = {
-+ .name = "aw9523-pinctrl",
-+ .of_match_table = of_aw9523_i2c_match,
-+ },
-+ .probe = aw9523_probe,
-+ .remove = aw9523_remove,
-+ .id_table = aw9523_i2c_id_table,
-+};
-+module_i2c_driver(aw9523_driver);
-+
-+MODULE_DESCRIPTION("Awinic AW9523 I2C GPIO Expander driver");
-+MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>");
-+MODULE_LICENSE("GPL v2");
projects / thirdparty / openwrt.git / commitdiff
