1 files changed, 508 insertions, 0 deletions
diff --git a/drivers/mfd/tc3589x.c b/drivers/mfd/tc3589x.c
new file mode 100644
index 000000000..d5d0ec117
--- /dev/null
+++ b/drivers/mfd/tc3589x.c
@@ -0,0 +1,508 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tc3589x.h>
+#include <linux/err.h>
+
+/*
+ * enum tc3589x_version - indicates the TC3589x version
+ */
+enum tc3589x_version {
+	TC3589X_TC35890,
+	TC3589X_TC35892,
+	TC3589X_TC35893,
+	TC3589X_TC35894,
+	TC3589X_TC35895,
+	TC3589X_TC35896,
+	TC3589X_UNKNOWN,
+};
+
+#define TC3589x_CLKMODE_MODCTL_SLEEP		0x0
+#define TC3589x_CLKMODE_MODCTL_OPERATION	(1 << 0)
+
+/**
+ * tc3589x_reg_read() - read a single TC3589x register
+ * @tc3589x:	Device to read from
+ * @reg:	Register to read
+ */
+int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
+{
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
+	if (ret < 0)
+		dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
+			reg, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tc3589x_reg_read);
+
+/**
+ * tc3589x_reg_write() - write a single TC3589x register
+ * @tc3589x:	Device to write to
+ * @reg:	Register to read
+ * @data:	Value to write
+ */
+int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
+{
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
+	if (ret < 0)
+		dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
+			reg, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tc3589x_reg_write);
+
+/**
+ * tc3589x_block_read() - read multiple TC3589x registers
+ * @tc3589x:	Device to read from
+ * @reg:	First register
+ * @length:	Number of registers
+ * @values:	Buffer to write to
+ */
+int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
+{
+	int ret;
+
+	ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
+	if (ret < 0)
+		dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
+			reg, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tc3589x_block_read);
+
+/**
+ * tc3589x_block_write() - write multiple TC3589x registers
+ * @tc3589x:	Device to write to
+ * @reg:	First register
+ * @length:	Number of registers
+ * @values:	Values to write
+ */
+int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
+			const u8 *values)
+{
+	int ret;
+
+	ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
+					     values);
+	if (ret < 0)
+		dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
+			reg, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tc3589x_block_write);
+
+/**
+ * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
+ * @tc3589x:	Device to write to
+ * @reg:	Register to write
+ * @mask:	Mask of bits to set
+ * @val:	Value to set
+ */
+int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
+{
+	int ret;
+
+	mutex_lock(&tc3589x->lock);
+
+	ret = tc3589x_reg_read(tc3589x, reg);
+	if (ret < 0)
+		goto out;
+
+	ret &= ~mask;
+	ret |= val;
+
+	ret = tc3589x_reg_write(tc3589x, reg, ret);
+
+out:
+	mutex_unlock(&tc3589x->lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tc3589x_set_bits);
+
+static const struct resource gpio_resources[] = {
+	{
+		.start	= TC3589x_INT_GPIIRQ,
+		.end	= TC3589x_INT_GPIIRQ,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static const struct resource keypad_resources[] = {
+	{
+		.start  = TC3589x_INT_KBDIRQ,
+		.end    = TC3589x_INT_KBDIRQ,
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+static const struct mfd_cell tc3589x_dev_gpio[] = {
+	{
+		.name		= "tc3589x-gpio",
+		.num_resources	= ARRAY_SIZE(gpio_resources),
+		.resources	= &gpio_resources[0],
+		.of_compatible	= "toshiba,tc3589x-gpio",
+	},
+};
+
+static const struct mfd_cell tc3589x_dev_keypad[] = {
+	{
+		.name           = "tc3589x-keypad",
+		.num_resources  = ARRAY_SIZE(keypad_resources),
+		.resources      = &keypad_resources[0],
+		.of_compatible	= "toshiba,tc3589x-keypad",
+	},
+};
+
+static irqreturn_t tc3589x_irq(int irq, void *data)
+{
+	struct tc3589x *tc3589x = data;
+	int status;
+
+again:
+	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
+	if (status < 0)
+		return IRQ_NONE;
+
+	while (status) {
+		int bit = __ffs(status);
+		int virq = irq_find_mapping(tc3589x->domain, bit);
+
+		handle_nested_irq(virq);
+		status &= ~(1 << bit);
+	}
+
+	/*
+	 * A dummy read or write (to any register) appears to be necessary to
+	 * have the last interrupt clear (for example, GPIO IC write) take
+	 * effect. In such a case, recheck for any interrupt which is still
+	 * pending.
+	 */
+	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
+	if (status)
+		goto again;
+
+	return IRQ_HANDLED;
+}
+
+static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
+				irq_hw_number_t hwirq)
+{
+	struct tc3589x *tc3589x = d->host_data;
+
+	irq_set_chip_data(virq, tc3589x);
+	irq_set_chip_and_handler(virq, &dummy_irq_chip,
+				handle_edge_irq);
+	irq_set_nested_thread(virq, 1);
+	irq_set_noprobe(virq);
+
+	return 0;
+}
+
+static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
+{
+	irq_set_chip_and_handler(virq, NULL, NULL);
+	irq_set_chip_data(virq, NULL);
+}
+
+static const struct irq_domain_ops tc3589x_irq_ops = {
+	.map    = tc3589x_irq_map,
+	.unmap  = tc3589x_irq_unmap,
+	.xlate  = irq_domain_xlate_onecell,
+};
+
+static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
+{
+	tc3589x->domain = irq_domain_add_simple(
+		np, TC3589x_NR_INTERNAL_IRQS, 0,
+		&tc3589x_irq_ops, tc3589x);
+
+	if (!tc3589x->domain) {
+		dev_err(tc3589x->dev, "Failed to create irqdomain\n");
+		return -ENOSYS;
+	}
+
+	return 0;
+}
+
+static int tc3589x_chip_init(struct tc3589x *tc3589x)
+{
+	int manf, ver, ret;
+
+	manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
+	if (manf < 0)
+		return manf;
+
+	ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
+	if (ver < 0)
+		return ver;
+
+	if (manf != TC3589x_MANFCODE_MAGIC) {
+		dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
+		return -EINVAL;
+	}
+
+	dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
+
+	/*
+	 * Put everything except the IRQ module into reset;
+	 * also spare the GPIO module for any pin initialization
+	 * done during pre-kernel boot
+	 */
+	ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
+				TC3589x_RSTCTRL_TIMRST
+				| TC3589x_RSTCTRL_ROTRST
+				| TC3589x_RSTCTRL_KBDRST);
+	if (ret < 0)
+		return ret;
+
+	/* Clear the reset interrupt. */
+	return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
+}
+
+static int tc3589x_device_init(struct tc3589x *tc3589x)
+{
+	int ret = 0;
+	unsigned int blocks = tc3589x->pdata->block;
+
+	if (blocks & TC3589x_BLOCK_GPIO) {
+		ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
+				      ARRAY_SIZE(tc3589x_dev_gpio), NULL,
+				      0, tc3589x->domain);
+		if (ret) {
+			dev_err(tc3589x->dev, "failed to add gpio child\n");
+			return ret;
+		}
+		dev_info(tc3589x->dev, "added gpio block\n");
+	}
+
+	if (blocks & TC3589x_BLOCK_KEYPAD) {
+		ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
+				      ARRAY_SIZE(tc3589x_dev_keypad), NULL,
+				      0, tc3589x->domain);
+		if (ret) {
+			dev_err(tc3589x->dev, "failed to keypad child\n");
+			return ret;
+		}
+		dev_info(tc3589x->dev, "added keypad block\n");
+	}
+
+	return ret;
+}
+
+static const struct of_device_id tc3589x_match[] = {
+	/* Legacy compatible string */
+	{ .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
+	{ .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
+	{ .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
+	{ .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
+	{ .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
+	{ .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
+	{ .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, tc3589x_match);
+
+static struct tc3589x_platform_data *
+tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
+{
+	struct device_node *np = dev->of_node;
+	struct tc3589x_platform_data *pdata;
+	struct device_node *child;
+	const struct of_device_id *of_id;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	of_id = of_match_device(tc3589x_match, dev);
+	if (!of_id)
+		return ERR_PTR(-ENODEV);
+	*version = (enum tc3589x_version) of_id->data;
+
+	for_each_child_of_node(np, child) {
+		if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
+			pdata->block |= TC3589x_BLOCK_GPIO;
+		if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
+			pdata->block |= TC3589x_BLOCK_KEYPAD;
+	}
+
+	return pdata;
+}
+
+static int tc3589x_probe(struct i2c_client *i2c,
+				   const struct i2c_device_id *id)
+{
+	struct device_node *np = i2c->dev.of_node;
+	struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
+	struct tc3589x *tc3589x;
+	enum tc3589x_version version;
+	int ret;
+
+	if (!pdata) {
+		pdata = tc3589x_of_probe(&i2c->dev, &version);
+		if (IS_ERR(pdata)) {
+			dev_err(&i2c->dev, "No platform data or DT found\n");
+			return PTR_ERR(pdata);
+		}
+	} else {
+		/* When not probing from device tree we have this ID */
+		version = id->driver_data;
+	}
+
+	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
+				     | I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -EIO;
+
+	tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
+				GFP_KERNEL);
+	if (!tc3589x)
+		return -ENOMEM;
+
+	mutex_init(&tc3589x->lock);
+
+	tc3589x->dev = &i2c->dev;
+	tc3589x->i2c = i2c;
+	tc3589x->pdata = pdata;
+
+	switch (version) {
+	case TC3589X_TC35893:
+	case TC3589X_TC35895:
+	case TC3589X_TC35896:
+		tc3589x->num_gpio = 20;
+		break;
+	case TC3589X_TC35890:
+	case TC3589X_TC35892:
+	case TC3589X_TC35894:
+	case TC3589X_UNKNOWN:
+	default:
+		tc3589x->num_gpio = 24;
+		break;
+	}
+
+	i2c_set_clientdata(i2c, tc3589x);
+
+	ret = tc3589x_chip_init(tc3589x);
+	if (ret)
+		return ret;
+
+	ret = tc3589x_irq_init(tc3589x, np);
+	if (ret)
+		return ret;
+
+	ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
+				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				   "tc3589x", tc3589x);
+	if (ret) {
+		dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
+		return ret;
+	}
+
+	ret = tc3589x_device_init(tc3589x);
+	if (ret) {
+		dev_err(tc3589x->dev, "failed to add child devices\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void tc3589x_remove(struct i2c_client *client)
+{
+	struct tc3589x *tc3589x = i2c_get_clientdata(client);
+
+	mfd_remove_devices(tc3589x->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tc3589x_suspend(struct device *dev)
+{
+	struct tc3589x *tc3589x = dev_get_drvdata(dev);
+	struct i2c_client *client = tc3589x->i2c;
+	int ret = 0;
+
+	/* put the system to sleep mode */
+	if (!device_may_wakeup(&client->dev))
+		ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
+				TC3589x_CLKMODE_MODCTL_SLEEP);
+
+	return ret;
+}
+
+static int tc3589x_resume(struct device *dev)
+{
+	struct tc3589x *tc3589x = dev_get_drvdata(dev);
+	struct i2c_client *client = tc3589x->i2c;
+	int ret = 0;
+
+	/* enable the system into operation */
+	if (!device_may_wakeup(&client->dev))
+		ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
+				TC3589x_CLKMODE_MODCTL_OPERATION);
+
+	return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
+
+static const struct i2c_device_id tc3589x_id[] = {
+	{ "tc35890", TC3589X_TC35890 },
+	{ "tc35892", TC3589X_TC35892 },
+	{ "tc35893", TC3589X_TC35893 },
+	{ "tc35894", TC3589X_TC35894 },
+	{ "tc35895", TC3589X_TC35895 },
+	{ "tc35896", TC3589X_TC35896 },
+	{ "tc3589x", TC3589X_UNKNOWN },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tc3589x_id);
+
+static struct i2c_driver tc3589x_driver = {
+	.driver = {
+		.name	= "tc3589x",
+		.pm	= &tc3589x_dev_pm_ops,
+		.of_match_table = of_match_ptr(tc3589x_match),
+	},
+	.probe		= tc3589x_probe,
+	.remove		= tc3589x_remove,
+	.id_table	= tc3589x_id,
+};
+
+static int __init tc3589x_init(void)
+{
+	return i2c_add_driver(&tc3589x_driver);
+}
+subsys_initcall(tc3589x_init);
+
+static void __exit tc3589x_exit(void)
+{
+	i2c_del_driver(&tc3589x_driver);
+}
+module_exit(tc3589x_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("TC3589x MFD core driver");
+MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");