The FSA9480 is a USB port accessory detector and switch. This patch adds support the FSA9480 USB Switch. Signed-off-by: Minkyu Kang <mk7.kang@xxxxxxxxxxx> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> --- please see below link for v2 patch https://patchwork.kernel.org/patch/244731/ v3: add sysfs document update the licence remove export symbol (will update) v2: use the threaded irq fix the sysfs .../ABI/testing/sysfs-bus-i2c-devices-fsa9480 | 21 + drivers/misc/Kconfig | 9 + drivers/misc/Makefile | 1 + drivers/misc/fsa9480.c | 557 ++++++++++++++++++++ include/linux/fsa9480.h | 27 + 5 files changed, 615 insertions(+), 0 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480 create mode 100644 drivers/misc/fsa9480.c create mode 100644 include/linux/fsa9480.h diff --git a/Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480 b/Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480 new file mode 100644 index 0000000..9de269b --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480 @@ -0,0 +1,21 @@ +What: /sys/bus/i2c/devices/.../device +Date: February 2011 +Contact: Minkyu Kang <mk7.kang@xxxxxxxxxxx> +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@xxxxxxxxxxx> +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 diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index cc8e49d..6121bfb 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -452,6 +452,15 @@ 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" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 98009cc..ccbf1a9 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -42,3 +42,4 @@ obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o obj-$(CONFIG_PCH_PHUB) += pch_phub.o obj-y += ti-st/ obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o +obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o diff --git a/drivers/misc/fsa9480.c b/drivers/misc/fsa9480.c new file mode 100644 index 0000000..8b49724 --- /dev/null +++ b/drivers/misc/fsa9480.c @@ -0,0 +1,557 @@ +/* + * fsa9480.c - FSA9480 micro USB switch device driver + * + * Copyright (C) 2010 Samsung Electronics + * Minkyu Kang <mk7.kang@xxxxxxxxxxx> + * Wonguk Jeong <wonguk.jeong@xxxxxxxxxxx> + * + * 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/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; +} + +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); +} + +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_IWUGO, + 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@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("FSA9480 USB Switch driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/fsa9480.h b/include/linux/fsa9480.h new file mode 100644 index 0000000..72dddcb --- /dev/null +++ b/include/linux/fsa9480.h @@ -0,0 +1,27 @@ +/* + * Copyright (C) 2010 Samsung Electronics + * Minkyu Kang <mk7.kang@xxxxxxxxxxx> + * + * 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_ */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
