[PATCH 4/4] platform/x86: Add crystal_cove_charger driver

[Hans de Goede]

Driver for the external-charger IRQ pass-through function of the
Bay Trail Crystal Cove PMIC.

Note this is NOT a power_supply class driver, it just deals with IRQ
pass-through, this requires this separate driver because the PMIC's
level 2 interrupt for this must be explicitly acked.

This new driver gets enabled by the existing X86_ANDROID_TABLETS Kconfig
option because the x86-android-tablets module is the only user of the
exported external-charger IRQ.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
 drivers/platform/x86/Makefile               |   2 +-
 drivers/platform/x86/crystal_cove_charger.c | 153 ++++++++++++++++++++
 2 files changed, 154 insertions(+), 1 deletion(-)
 create mode 100644 drivers/platform/x86/crystal_cove_charger.c

diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index bd20b435c22b..cce124e3acab 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -114,7 +114,7 @@ obj-$(CONFIG_I2C_MULTI_INSTANTIATE)	+= i2c-multi-instantiate.o
 obj-$(CONFIG_MLX_PLATFORM)		+= mlx-platform.o
 obj-$(CONFIG_TOUCHSCREEN_DMI)		+= touchscreen_dmi.o
 obj-$(CONFIG_WIRELESS_HOTKEY)		+= wireless-hotkey.o
-obj-$(CONFIG_X86_ANDROID_TABLETS)	+= x86-android-tablets.o
+obj-$(CONFIG_X86_ANDROID_TABLETS)	+= x86-android-tablets.o crystal_cove_charger.o
 
 # Intel uncore drivers
 obj-$(CONFIG_INTEL_IPS)				+= intel_ips.o
diff --git a/drivers/platform/x86/crystal_cove_charger.c b/drivers/platform/x86/crystal_cove_charger.c
new file mode 100644
index 000000000000..382c19806b12
--- /dev/null
+++ b/drivers/platform/x86/crystal_cove_charger.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for the external-charger IRQ pass-through function of the
+ * Bay Trail Crystal Cove PMIC.
+ *
+ * Note this is NOT a power_supply class driver, it just deals with IRQ
+ * pass-through, this requires this separate driver because the PMIC's
+ * level 2 interrupt for this must be explicitly acked.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define CHGRIRQ_REG					0x0a
+
+struct crystal_cove_charger_data {
+	struct mutex buslock; /* irq_bus_lock */
+	struct irq_chip irqchip;
+	struct regmap *regmap;
+	struct irq_domain *irq_domain;
+	int irq;
+	int charger_irq;
+	bool irq_enabled;
+	bool irq_is_enabled;
+};
+
+static irqreturn_t crystal_cove_charger_irq(int irq, void *data)
+{
+	struct crystal_cove_charger_data *charger = data;
+
+	/* No need to read CHGRIRQ_REG as there is only 1 IRQ */
+	handle_nested_irq(charger->charger_irq);
+
+	/* Ack CHGRIRQ 0 */
+	regmap_write(charger->regmap, CHGRIRQ_REG, BIT(0));
+
+	return IRQ_HANDLED;
+}
+
+static void crystal_cove_charger_irq_bus_lock(struct irq_data *data)
+{
+	struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&charger->buslock);
+}
+
+static void crystal_cove_charger_irq_bus_sync_unlock(struct irq_data *data)
+{
+	struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
+
+	if (charger->irq_is_enabled != charger->irq_enabled) {
+		if (charger->irq_enabled)
+			enable_irq(charger->irq);
+		else
+			disable_irq(charger->irq);
+
+		charger->irq_is_enabled = charger->irq_enabled;
+	}
+
+	mutex_unlock(&charger->buslock);
+}
+
+static void crystal_cove_charger_irq_unmask(struct irq_data *data)
+{
+	struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
+
+	charger->irq_enabled = true;
+}
+
+static void crystal_cove_charger_irq_mask(struct irq_data *data)
+{
+	struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
+
+	charger->irq_enabled = false;
+}
+
+static void crystal_cove_charger_rm_irq_domain(void *data)
+{
+	struct crystal_cove_charger_data *charger = data;
+
+	irq_domain_remove(charger->irq_domain);
+}
+
+static int crystal_cove_charger_probe(struct platform_device *pdev)
+{
+	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
+	struct crystal_cove_charger_data *charger;
+	int ret;
+
+	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	charger->regmap = pmic->regmap;
+	mutex_init(&charger->buslock);
+
+	charger->irq = platform_get_irq(pdev, 0);
+	if (charger->irq < 0)
+		return charger->irq;
+
+	charger->irq_domain = irq_domain_create_linear(dev_fwnode(pdev->dev.parent), 1,
+						       &irq_domain_simple_ops, NULL);
+	if (!charger->irq_domain)
+		return -ENOMEM;
+
+	/* Distuingish IRQ domain from others sharing (MFD) the same fwnode */
+	irq_domain_update_bus_token(charger->irq_domain, DOMAIN_BUS_WAKEUP);
+
+	ret = devm_add_action_or_reset(&pdev->dev, crystal_cove_charger_rm_irq_domain, charger);
+	if (ret)
+		return ret;
+
+	charger->charger_irq = irq_create_mapping(charger->irq_domain, 0);
+	if (!charger->charger_irq)
+		return -ENOMEM;
+
+	charger->irqchip.name = KBUILD_MODNAME;
+	charger->irqchip.irq_unmask = crystal_cove_charger_irq_unmask;
+	charger->irqchip.irq_mask = crystal_cove_charger_irq_mask;
+	charger->irqchip.irq_bus_lock = crystal_cove_charger_irq_bus_lock;
+	charger->irqchip.irq_bus_sync_unlock = crystal_cove_charger_irq_bus_sync_unlock;
+
+	irq_set_chip_data(charger->charger_irq, charger);
+	irq_set_chip_and_handler(charger->charger_irq, &charger->irqchip, handle_simple_irq);
+	irq_set_nested_thread(charger->charger_irq, true);
+	irq_set_noprobe(charger->charger_irq);
+
+	ret = devm_request_threaded_irq(&pdev->dev, charger->irq, NULL,
+					crystal_cove_charger_irq,
+					IRQF_ONESHOT | IRQF_NO_AUTOEN,
+					KBUILD_MODNAME, charger);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "requesting irq\n");
+
+	return 0;
+}
+
+static struct platform_driver crystal_cove_charger_driver = {
+	.probe = crystal_cove_charger_probe,
+	.driver = {
+		.name = "crystal_cove_charger",
+	},
+};
+module_platform_driver(crystal_cove_charger_driver);
+
+MODULE_AUTHOR("Hans de Goede <hdegoede@xxxxxxxxxx");
+MODULE_DESCRIPTION("Bay Trail Crystal Cove external charger IRQ pass-through");
+MODULE_LICENSE("GPL");
-- 
2.33.1