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
