--- /dev/null
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License, version 2
+ * 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_read() - 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
+ * @values: 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 struct resource gpio_resources[] = {
+ {
+ .start = TC3589x_INT_GPIIRQ,
+ .end = TC3589x_INT_GPIIRQ,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static 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_create_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);
+#ifdef CONFIG_ARM
+ set_irq_flags(virq, IRQF_VALID);
+#else
+ irq_set_noprobe(virq);
+#endif
+
+ return 0;
+}
+
+static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
+{
+#ifdef CONFIG_ARM
+ set_irq_flags(virq, 0);
+#endif
+ irq_set_chip_and_handler(virq, NULL, NULL);
+ irq_set_chip_data(virq, NULL);
+}
+
+static 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 int tc3589x_remove(struct i2c_client *client)
+{
+ struct tc3589x *tc3589x = i2c_get_clientdata(client);
+
+ mfd_remove_devices(tc3589x->dev);
+
+ return 0;
+}
+
+#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",
+ .owner = THIS_MODULE,
+ .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");
Code Review / kvmfornfv.git / blobdiff