drivers/misc: add support the FSA9480 USB Switch
Donggeun Kim [Tue, 26 Jul 2011 00:13:07 +0000 (17:13 -0700)]
The FSA9480 is a USB port accessory detector and switch.  This patch adds
support the FSA9480 USB Switch.

[akpm@linux-foundation.org: make a couple of things static]
Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480 [new file with mode: 0644]
drivers/misc/Kconfig
drivers/misc/Makefile
drivers/misc/fsa9480.c [new file with mode: 0644]
include/linux/platform_data/fsa9480.h [new file with mode: 0644]

diff --git a/Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480 b/Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480
new file mode 100644 (file)
index 0000000..9de269b
--- /dev/null
@@ -0,0 +1,21 @@
+What:          /sys/bus/i2c/devices/.../device
+Date:          February 2011
+Contact:       Minkyu Kang <mk7.kang@samsung.com>
+Description:
+               show what device is attached
+               NONE - no device
+               USB - USB device is attached
+               UART - UART is attached
+               CHARGER - Charger is attaced
+               JIG - JIG is attached
+
+What:          /sys/bus/i2c/devices/.../switch
+Date:          February 2011
+Contact:       Minkyu Kang <mk7.kang@samsung.com>
+Description:
+               show or set the state of manual switch
+               VAUDIO - switch to VAUDIO path
+               UART - switch to UART path
+               AUDIO - switch to AUDIO path
+               DHOST - switch to DHOST path
+               AUTO - switch automatically by device
index 3546474..0a4d86c 100644 (file)
@@ -489,6 +489,15 @@ config PCH_PHUB
          To compile this driver as a module, choose M here: the module will
          be called pch_phub.
 
+config USB_SWITCH_FSA9480
+       tristate "FSA9480 USB Switch"
+       depends on I2C
+       help
+         The FSA9480 is a USB port accessory detector and switch.
+         The FSA9480 is fully controlled using I2C and enables USB data,
+         stereo and mono audio, video, microphone and UART data to use
+         a common connector port.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
index 5f03172..3328215 100644 (file)
@@ -46,3 +46,4 @@ obj-y                         += ti-st/
 obj-$(CONFIG_AB8500_PWM)       += ab8500-pwm.o
 obj-y                          += lis3lv02d/
 obj-y                          += carma/
+obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
diff --git a/drivers/misc/fsa9480.c b/drivers/misc/fsa9480.c
new file mode 100644 (file)
index 0000000..5325a7e
--- /dev/null
@@ -0,0 +1,557 @@
+/*
+ * 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 reqeust IRQ\n");
+                       return ret;
+               }
+
+               device_init_wakeup(&client->dev, pdata->wakeup);
+       }
+
+       return 0;
+}
+
+static int __devinit 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, NULL);
+fail1:
+       i2c_set_clientdata(client, NULL);
+       kfree(usbsw);
+       return ret;
+}
+
+static int __devexit fsa9480_remove(struct i2c_client *client)
+{
+       struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
+       if (client->irq)
+               free_irq(client->irq, NULL);
+       i2c_set_clientdata(client, NULL);
+
+       sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
+       device_init_wakeup(&client->dev, 0);
+       kfree(usbsw);
+       return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int fsa9480_suspend(struct i2c_client *client, pm_message_t state)
+{
+       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 i2c_client *client)
+{
+       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;
+}
+
+#else
+
+#define fsa9480_suspend NULL
+#define fsa9480_resume NULL
+
+#endif /* CONFIG_PM */
+
+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",
+       },
+       .probe = fsa9480_probe,
+       .remove = __devexit_p(fsa9480_remove),
+       .resume = fsa9480_resume,
+       .suspend = fsa9480_suspend,
+       .id_table = fsa9480_id,
+};
+
+static int __init fsa9480_init(void)
+{
+       return i2c_add_driver(&fsa9480_i2c_driver);
+}
+module_init(fsa9480_init);
+
+static void __exit fsa9480_exit(void)
+{
+       i2c_del_driver(&fsa9480_i2c_driver);
+}
+module_exit(fsa9480_exit);
+
+MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
+MODULE_DESCRIPTION("FSA9480 USB Switch driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/fsa9480.h b/include/linux/platform_data/fsa9480.h
new file mode 100644 (file)
index 0000000..72dddcb
--- /dev/null
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2010 Samsung Electronics
+ * Minkyu Kang <mk7.kang@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.
+ */
+
+#ifndef _FSA9480_H_
+#define _FSA9480_H_
+
+#define FSA9480_ATTACHED       1
+#define FSA9480_DETACHED       0
+
+struct fsa9480_platform_data {
+       void (*cfg_gpio) (void);
+       void (*usb_cb) (u8 attached);
+       void (*uart_cb) (u8 attached);
+       void (*charger_cb) (u8 attached);
+       void (*jig_cb) (u8 attached);
+       void (*reset_cb) (void);
+       void (*usb_power) (u8 on);
+       int wakeup;
+};
+
+#endif /* _FSA9480_H_ */