Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 278 insertions, 0 deletions

diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
new file mode 100644
index 0000000000..81e517cdfb
--- /dev/null
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 Spreadtrum Communications Inc.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sc27xx-pmic.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <uapi/linux/usb/charger.h>
+
+#define SPRD_PMIC_INT_MASK_STATUS	0x0
+#define SPRD_PMIC_INT_RAW_STATUS	0x4
+#define SPRD_PMIC_INT_EN		0x8
+
+#define SPRD_SC2730_IRQ_BASE		0x80
+#define SPRD_SC2730_IRQ_NUMS		10
+#define SPRD_SC2730_CHG_DET		0x1b9c
+#define SPRD_SC2731_IRQ_BASE		0x140
+#define SPRD_SC2731_IRQ_NUMS		16
+#define SPRD_SC2731_CHG_DET		0xedc
+
+/* PMIC charger detection definition */
+#define SPRD_PMIC_CHG_DET_DELAY_US	200000
+#define SPRD_PMIC_CHG_DET_TIMEOUT	2000000
+#define SPRD_PMIC_CHG_DET_DONE		BIT(11)
+#define SPRD_PMIC_SDP_TYPE		BIT(7)
+#define SPRD_PMIC_DCP_TYPE		BIT(6)
+#define SPRD_PMIC_CDP_TYPE		BIT(5)
+#define SPRD_PMIC_CHG_TYPE_MASK		GENMASK(7, 5)
+
+struct sprd_pmic {
+	struct regmap *regmap;
+	struct device *dev;
+	struct regmap_irq *irqs;
+	struct regmap_irq_chip irq_chip;
+	struct regmap_irq_chip_data *irq_data;
+	const struct sprd_pmic_data *pdata;
+	int irq;
+};
+
+struct sprd_pmic_data {
+	u32 irq_base;
+	u32 num_irqs;
+	u32 charger_det;
+};
+
+/*
+ * Since different PMICs of SC27xx series can have different interrupt
+ * base address and irq number, we should save irq number and irq base
+ * in the device data structure.
+ */
+static const struct sprd_pmic_data sc2730_data = {
+	.irq_base = SPRD_SC2730_IRQ_BASE,
+	.num_irqs = SPRD_SC2730_IRQ_NUMS,
+	.charger_det = SPRD_SC2730_CHG_DET,
+};
+
+static const struct sprd_pmic_data sc2731_data = {
+	.irq_base = SPRD_SC2731_IRQ_BASE,
+	.num_irqs = SPRD_SC2731_IRQ_NUMS,
+	.charger_det = SPRD_SC2731_CHG_DET,
+};
+
+enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct sprd_pmic *ddata = spi_get_drvdata(spi);
+	const struct sprd_pmic_data *pdata = ddata->pdata;
+	enum usb_charger_type type;
+	u32 val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
+				       (val & SPRD_PMIC_CHG_DET_DONE),
+				       SPRD_PMIC_CHG_DET_DELAY_US,
+				       SPRD_PMIC_CHG_DET_TIMEOUT);
+	if (ret) {
+		dev_err(&spi->dev, "failed to detect charger type\n");
+		return UNKNOWN_TYPE;
+	}
+
+	switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
+	case SPRD_PMIC_CDP_TYPE:
+		type = CDP_TYPE;
+		break;
+	case SPRD_PMIC_DCP_TYPE:
+		type = DCP_TYPE;
+		break;
+	case SPRD_PMIC_SDP_TYPE:
+		type = SDP_TYPE;
+		break;
+	default:
+		type = UNKNOWN_TYPE;
+		break;
+	}
+
+	return type;
+}
+EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
+
+static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+
+	return spi_write(spi, data, count);
+}
+
+static int sprd_pmic_spi_read(void *context,
+			      const void *reg, size_t reg_size,
+			      void *val, size_t val_size)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+	u32 rx_buf[2] = { 0 };
+	int ret;
+
+	/* Now we only support one PMIC register to read every time. */
+	if (reg_size != sizeof(u32) || val_size != sizeof(u32))
+		return -EINVAL;
+
+	/* Copy address to read from into first element of SPI buffer. */
+	memcpy(rx_buf, reg, sizeof(u32));
+	ret = spi_read(spi, rx_buf, 1);
+	if (ret < 0)
+		return ret;
+
+	memcpy(val, rx_buf, val_size);
+	return 0;
+}
+
+static struct regmap_bus sprd_pmic_regmap = {
+	.write = sprd_pmic_spi_write,
+	.read = sprd_pmic_spi_read,
+	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+};
+
+static const struct regmap_config sprd_pmic_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = 0xffff,
+};
+
+static int sprd_pmic_probe(struct spi_device *spi)
+{
+	struct sprd_pmic *ddata;
+	const struct sprd_pmic_data *pdata;
+	int ret, i;
+
+	pdata = of_device_get_match_data(&spi->dev);
+	if (!pdata) {
+		dev_err(&spi->dev, "No matching driver data found\n");
+		return -EINVAL;
+	}
+
+	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
+					 &spi->dev, &sprd_pmic_config);
+	if (IS_ERR(ddata->regmap)) {
+		ret = PTR_ERR(ddata->regmap);
+		dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
+		return ret;
+	}
+
+	spi_set_drvdata(spi, ddata);
+	ddata->dev = &spi->dev;
+	ddata->irq = spi->irq;
+	ddata->pdata = pdata;
+
+	ddata->irq_chip.name = dev_name(&spi->dev);
+	ddata->irq_chip.status_base =
+		pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
+	ddata->irq_chip.unmask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
+	ddata->irq_chip.ack_base = 0;
+	ddata->irq_chip.num_regs = 1;
+	ddata->irq_chip.num_irqs = pdata->num_irqs;
+
+	ddata->irqs = devm_kcalloc(&spi->dev,
+				   pdata->num_irqs, sizeof(struct regmap_irq),
+				   GFP_KERNEL);
+	if (!ddata->irqs)
+		return -ENOMEM;
+
+	ddata->irq_chip.irqs = ddata->irqs;
+	for (i = 0; i < pdata->num_irqs; i++)
+		ddata->irqs[i].mask = BIT(i);
+
+	ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
+				       IRQF_ONESHOT, 0,
+				       &ddata->irq_chip, &ddata->irq_data);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_of_platform_populate(&spi->dev);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
+		return ret;
+	}
+
+	device_init_wakeup(&spi->dev, true);
+	return 0;
+}
+
+static int sprd_pmic_suspend(struct device *dev)
+{
+	struct sprd_pmic *ddata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(ddata->irq);
+
+	return 0;
+}
+
+static int sprd_pmic_resume(struct device *dev)
+{
+	struct sprd_pmic *ddata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(ddata->irq);
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops,
+				sprd_pmic_suspend, sprd_pmic_resume);
+
+static const struct of_device_id sprd_pmic_match[] = {
+	{ .compatible = "sprd,sc2730", .data = &sc2730_data },
+	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sprd_pmic_match);
+
+static const struct spi_device_id sprd_pmic_spi_ids[] = {
+	{ .name = "sc2730", .driver_data = (unsigned long)&sc2730_data },
+	{ .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },
+	{},
+};
+MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);
+
+static struct spi_driver sprd_pmic_driver = {
+	.driver = {
+		.name = "sc27xx-pmic",
+		.of_match_table = sprd_pmic_match,
+		.pm = pm_sleep_ptr(&sprd_pmic_pm_ops),
+	},
+	.probe = sprd_pmic_probe,
+	.id_table = sprd_pmic_spi_ids,
+};
+
+static int __init sprd_pmic_init(void)
+{
+	return spi_register_driver(&sprd_pmic_driver);
+}
+subsys_initcall(sprd_pmic_init);
+
+static void __exit sprd_pmic_exit(void)
+{
+	spi_unregister_driver(&sprd_pmic_driver);
+}
+module_exit(sprd_pmic_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
+MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");