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path: root/drivers/misc/fsa9480.c
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Diffstat (limited to 'drivers/misc/fsa9480.c')
-rw-r--r--drivers/misc/fsa9480.c549
1 files changed, 549 insertions, 0 deletions
diff --git a/drivers/misc/fsa9480.c b/drivers/misc/fsa9480.c
new file mode 100644
index 000000000..71d2793b3
--- /dev/null
+++ b/drivers/misc/fsa9480.c
@@ -0,0 +1,549 @@
+/*
+ * fsa9480.c - FSA9480 micro USB switch device driver
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ * Minkyu Kang <mk7.kang@samsung.com>
+ * Wonguk Jeong <wonguk.jeong@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/platform_data/fsa9480.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+
+/* FSA9480 I2C registers */
+#define FSA9480_REG_DEVID 0x01
+#define FSA9480_REG_CTRL 0x02
+#define FSA9480_REG_INT1 0x03
+#define FSA9480_REG_INT2 0x04
+#define FSA9480_REG_INT1_MASK 0x05
+#define FSA9480_REG_INT2_MASK 0x06
+#define FSA9480_REG_ADC 0x07
+#define FSA9480_REG_TIMING1 0x08
+#define FSA9480_REG_TIMING2 0x09
+#define FSA9480_REG_DEV_T1 0x0a
+#define FSA9480_REG_DEV_T2 0x0b
+#define FSA9480_REG_BTN1 0x0c
+#define FSA9480_REG_BTN2 0x0d
+#define FSA9480_REG_CK 0x0e
+#define FSA9480_REG_CK_INT1 0x0f
+#define FSA9480_REG_CK_INT2 0x10
+#define FSA9480_REG_CK_INTMASK1 0x11
+#define FSA9480_REG_CK_INTMASK2 0x12
+#define FSA9480_REG_MANSW1 0x13
+#define FSA9480_REG_MANSW2 0x14
+
+/* Control */
+#define CON_SWITCH_OPEN (1 << 4)
+#define CON_RAW_DATA (1 << 3)
+#define CON_MANUAL_SW (1 << 2)
+#define CON_WAIT (1 << 1)
+#define CON_INT_MASK (1 << 0)
+#define CON_MASK (CON_SWITCH_OPEN | CON_RAW_DATA | \
+ CON_MANUAL_SW | CON_WAIT)
+
+/* Device Type 1 */
+#define DEV_USB_OTG (1 << 7)
+#define DEV_DEDICATED_CHG (1 << 6)
+#define DEV_USB_CHG (1 << 5)
+#define DEV_CAR_KIT (1 << 4)
+#define DEV_UART (1 << 3)
+#define DEV_USB (1 << 2)
+#define DEV_AUDIO_2 (1 << 1)
+#define DEV_AUDIO_1 (1 << 0)
+
+#define DEV_T1_USB_MASK (DEV_USB_OTG | DEV_USB)
+#define DEV_T1_UART_MASK (DEV_UART)
+#define DEV_T1_CHARGER_MASK (DEV_DEDICATED_CHG | DEV_USB_CHG)
+
+/* Device Type 2 */
+#define DEV_AV (1 << 6)
+#define DEV_TTY (1 << 5)
+#define DEV_PPD (1 << 4)
+#define DEV_JIG_UART_OFF (1 << 3)
+#define DEV_JIG_UART_ON (1 << 2)
+#define DEV_JIG_USB_OFF (1 << 1)
+#define DEV_JIG_USB_ON (1 << 0)
+
+#define DEV_T2_USB_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON)
+#define DEV_T2_UART_MASK (DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
+#define DEV_T2_JIG_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \
+ DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
+
+/*
+ * Manual Switch
+ * D- [7:5] / D+ [4:2]
+ * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO
+ */
+#define SW_VAUDIO ((4 << 5) | (4 << 2))
+#define SW_UART ((3 << 5) | (3 << 2))
+#define SW_AUDIO ((2 << 5) | (2 << 2))
+#define SW_DHOST ((1 << 5) | (1 << 2))
+#define SW_AUTO ((0 << 5) | (0 << 2))
+
+/* Interrupt 1 */
+#define INT_DETACH (1 << 1)
+#define INT_ATTACH (1 << 0)
+
+struct fsa9480_usbsw {
+ struct i2c_client *client;
+ struct fsa9480_platform_data *pdata;
+ int dev1;
+ int dev2;
+ int mansw;
+};
+
+static struct fsa9480_usbsw *chip;
+
+static int fsa9480_write_reg(struct i2c_client *client,
+ int reg, int value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static int fsa9480_read_reg(struct i2c_client *client, int reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static int fsa9480_read_irq(struct i2c_client *client, int *value)
+{
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(client,
+ FSA9480_REG_INT1, 2, (u8 *)value);
+ *value &= 0xffff;
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static void fsa9480_set_switch(const char *buf)
+{
+ struct fsa9480_usbsw *usbsw = chip;
+ struct i2c_client *client = usbsw->client;
+ unsigned int value;
+ unsigned int path = 0;
+
+ value = fsa9480_read_reg(client, FSA9480_REG_CTRL);
+
+ if (!strncmp(buf, "VAUDIO", 6)) {
+ path = SW_VAUDIO;
+ value &= ~CON_MANUAL_SW;
+ } else if (!strncmp(buf, "UART", 4)) {
+ path = SW_UART;
+ value &= ~CON_MANUAL_SW;
+ } else if (!strncmp(buf, "AUDIO", 5)) {
+ path = SW_AUDIO;
+ value &= ~CON_MANUAL_SW;
+ } else if (!strncmp(buf, "DHOST", 5)) {
+ path = SW_DHOST;
+ value &= ~CON_MANUAL_SW;
+ } else if (!strncmp(buf, "AUTO", 4)) {
+ path = SW_AUTO;
+ value |= CON_MANUAL_SW;
+ } else {
+ printk(KERN_ERR "Wrong command\n");
+ return;
+ }
+
+ usbsw->mansw = path;
+ fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);
+ fsa9480_write_reg(client, FSA9480_REG_CTRL, value);
+}
+
+static ssize_t fsa9480_get_switch(char *buf)
+{
+ struct fsa9480_usbsw *usbsw = chip;
+ struct i2c_client *client = usbsw->client;
+ unsigned int value;
+
+ value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
+
+ if (value == SW_VAUDIO)
+ return sprintf(buf, "VAUDIO\n");
+ else if (value == SW_UART)
+ return sprintf(buf, "UART\n");
+ else if (value == SW_AUDIO)
+ return sprintf(buf, "AUDIO\n");
+ else if (value == SW_DHOST)
+ return sprintf(buf, "DHOST\n");
+ else if (value == SW_AUTO)
+ return sprintf(buf, "AUTO\n");
+ else
+ return sprintf(buf, "%x", value);
+}
+
+static ssize_t fsa9480_show_device(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct fsa9480_usbsw *usbsw = dev_get_drvdata(dev);
+ struct i2c_client *client = usbsw->client;
+ int dev1, dev2;
+
+ dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
+ dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
+
+ if (!dev1 && !dev2)
+ return sprintf(buf, "NONE\n");
+
+ /* USB */
+ if (dev1 & DEV_T1_USB_MASK || dev2 & DEV_T2_USB_MASK)
+ return sprintf(buf, "USB\n");
+
+ /* UART */
+ if (dev1 & DEV_T1_UART_MASK || dev2 & DEV_T2_UART_MASK)
+ return sprintf(buf, "UART\n");
+
+ /* CHARGER */
+ if (dev1 & DEV_T1_CHARGER_MASK)
+ return sprintf(buf, "CHARGER\n");
+
+ /* JIG */
+ if (dev2 & DEV_T2_JIG_MASK)
+ return sprintf(buf, "JIG\n");
+
+ return sprintf(buf, "UNKNOWN\n");
+}
+
+static ssize_t fsa9480_show_manualsw(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return fsa9480_get_switch(buf);
+
+}
+
+static ssize_t fsa9480_set_manualsw(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ fsa9480_set_switch(buf);
+
+ return count;
+}
+
+static DEVICE_ATTR(device, S_IRUGO, fsa9480_show_device, NULL);
+static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
+ fsa9480_show_manualsw, fsa9480_set_manualsw);
+
+static struct attribute *fsa9480_attributes[] = {
+ &dev_attr_device.attr,
+ &dev_attr_switch.attr,
+ NULL
+};
+
+static const struct attribute_group fsa9480_group = {
+ .attrs = fsa9480_attributes,
+};
+
+static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw, int intr)
+{
+ int val1, val2, ctrl;
+ struct fsa9480_platform_data *pdata = usbsw->pdata;
+ struct i2c_client *client = usbsw->client;
+
+ val1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
+ val2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
+ ctrl = fsa9480_read_reg(client, FSA9480_REG_CTRL);
+
+ dev_info(&client->dev, "intr: 0x%x, dev1: 0x%x, dev2: 0x%x\n",
+ intr, val1, val2);
+
+ if (!intr)
+ goto out;
+
+ if (intr & INT_ATTACH) { /* Attached */
+ /* USB */
+ if (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK) {
+ if (pdata->usb_cb)
+ pdata->usb_cb(FSA9480_ATTACHED);
+
+ if (usbsw->mansw) {
+ fsa9480_write_reg(client,
+ FSA9480_REG_MANSW1, usbsw->mansw);
+ }
+ }
+
+ /* UART */
+ if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {
+ if (pdata->uart_cb)
+ pdata->uart_cb(FSA9480_ATTACHED);
+
+ if (!(ctrl & CON_MANUAL_SW)) {
+ fsa9480_write_reg(client,
+ FSA9480_REG_MANSW1, SW_UART);
+ }
+ }
+
+ /* CHARGER */
+ if (val1 & DEV_T1_CHARGER_MASK) {
+ if (pdata->charger_cb)
+ pdata->charger_cb(FSA9480_ATTACHED);
+ }
+
+ /* JIG */
+ if (val2 & DEV_T2_JIG_MASK) {
+ if (pdata->jig_cb)
+ pdata->jig_cb(FSA9480_ATTACHED);
+ }
+ } else if (intr & INT_DETACH) { /* Detached */
+ /* USB */
+ if (usbsw->dev1 & DEV_T1_USB_MASK ||
+ usbsw->dev2 & DEV_T2_USB_MASK) {
+ if (pdata->usb_cb)
+ pdata->usb_cb(FSA9480_DETACHED);
+ }
+
+ /* UART */
+ if (usbsw->dev1 & DEV_T1_UART_MASK ||
+ usbsw->dev2 & DEV_T2_UART_MASK) {
+ if (pdata->uart_cb)
+ pdata->uart_cb(FSA9480_DETACHED);
+ }
+
+ /* CHARGER */
+ if (usbsw->dev1 & DEV_T1_CHARGER_MASK) {
+ if (pdata->charger_cb)
+ pdata->charger_cb(FSA9480_DETACHED);
+ }
+
+ /* JIG */
+ if (usbsw->dev2 & DEV_T2_JIG_MASK) {
+ if (pdata->jig_cb)
+ pdata->jig_cb(FSA9480_DETACHED);
+ }
+ }
+
+ usbsw->dev1 = val1;
+ usbsw->dev2 = val2;
+
+out:
+ ctrl &= ~CON_INT_MASK;
+ fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
+}
+
+static irqreturn_t fsa9480_irq_handler(int irq, void *data)
+{
+ struct fsa9480_usbsw *usbsw = data;
+ struct i2c_client *client = usbsw->client;
+ int intr;
+
+ /* clear interrupt */
+ fsa9480_read_irq(client, &intr);
+
+ /* device detection */
+ fsa9480_detect_dev(usbsw, intr);
+
+ return IRQ_HANDLED;
+}
+
+static int fsa9480_irq_init(struct fsa9480_usbsw *usbsw)
+{
+ struct fsa9480_platform_data *pdata = usbsw->pdata;
+ struct i2c_client *client = usbsw->client;
+ int ret;
+ int intr;
+ unsigned int ctrl = CON_MASK;
+
+ /* clear interrupt */
+ fsa9480_read_irq(client, &intr);
+
+ /* unmask interrupt (attach/detach only) */
+ fsa9480_write_reg(client, FSA9480_REG_INT1_MASK, 0xfc);
+ fsa9480_write_reg(client, FSA9480_REG_INT2_MASK, 0x1f);
+
+ usbsw->mansw = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
+
+ if (usbsw->mansw)
+ ctrl &= ~CON_MANUAL_SW; /* Manual Switching Mode */
+
+ fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
+
+ if (pdata && pdata->cfg_gpio)
+ pdata->cfg_gpio();
+
+ if (client->irq) {
+ ret = request_threaded_irq(client->irq, NULL,
+ fsa9480_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "fsa9480 micro USB", usbsw);
+ if (ret) {
+ dev_err(&client->dev, "failed to request IRQ\n");
+ return ret;
+ }
+
+ if (pdata)
+ device_init_wakeup(&client->dev, pdata->wakeup);
+ }
+
+ return 0;
+}
+
+static int fsa9480_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct fsa9480_usbsw *usbsw;
+ int ret = 0;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ usbsw = kzalloc(sizeof(struct fsa9480_usbsw), GFP_KERNEL);
+ if (!usbsw) {
+ dev_err(&client->dev, "failed to allocate driver data\n");
+ return -ENOMEM;
+ }
+
+ usbsw->client = client;
+ usbsw->pdata = client->dev.platform_data;
+
+ chip = usbsw;
+
+ i2c_set_clientdata(client, usbsw);
+
+ ret = fsa9480_irq_init(usbsw);
+ if (ret)
+ goto fail1;
+
+ ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);
+ if (ret) {
+ dev_err(&client->dev,
+ "failed to create fsa9480 attribute group\n");
+ goto fail2;
+ }
+
+ /* ADC Detect Time: 500ms */
+ fsa9480_write_reg(client, FSA9480_REG_TIMING1, 0x6);
+
+ if (chip->pdata->reset_cb)
+ chip->pdata->reset_cb();
+
+ /* device detection */
+ fsa9480_detect_dev(usbsw, INT_ATTACH);
+
+ pm_runtime_set_active(&client->dev);
+
+ return 0;
+
+fail2:
+ if (client->irq)
+ free_irq(client->irq, usbsw);
+fail1:
+ kfree(usbsw);
+ return ret;
+}
+
+static int fsa9480_remove(struct i2c_client *client)
+{
+ struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
+ if (client->irq)
+ free_irq(client->irq, usbsw);
+
+ sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
+ device_init_wakeup(&client->dev, 0);
+ kfree(usbsw);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int fsa9480_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
+ struct fsa9480_platform_data *pdata = usbsw->pdata;
+
+ if (device_may_wakeup(&client->dev) && client->irq)
+ enable_irq_wake(client->irq);
+
+ if (pdata->usb_power)
+ pdata->usb_power(0);
+
+ return 0;
+}
+
+static int fsa9480_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
+ int dev1, dev2;
+
+ if (device_may_wakeup(&client->dev) && client->irq)
+ disable_irq_wake(client->irq);
+
+ /*
+ * Clear Pending interrupt. Note that detect_dev does what
+ * the interrupt handler does. So, we don't miss pending and
+ * we reenable interrupt if there is one.
+ */
+ fsa9480_read_reg(client, FSA9480_REG_INT1);
+ fsa9480_read_reg(client, FSA9480_REG_INT2);
+
+ dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
+ dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
+
+ /* device detection */
+ fsa9480_detect_dev(usbsw, (dev1 || dev2) ? INT_ATTACH : INT_DETACH);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(fsa9480_pm_ops, fsa9480_suspend, fsa9480_resume);
+#define FSA9480_PM_OPS (&fsa9480_pm_ops)
+
+#else
+
+#define FSA9480_PM_OPS NULL
+
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct i2c_device_id fsa9480_id[] = {
+ {"fsa9480", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, fsa9480_id);
+
+static struct i2c_driver fsa9480_i2c_driver = {
+ .driver = {
+ .name = "fsa9480",
+ .pm = FSA9480_PM_OPS,
+ },
+ .probe = fsa9480_probe,
+ .remove = fsa9480_remove,
+ .id_table = fsa9480_id,
+};
+
+module_i2c_driver(fsa9480_i2c_driver);
+
+MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
+MODULE_DESCRIPTION("FSA9480 USB Switch driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-09 15:12:41 +0000