/* * 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; } 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 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 = fsa9480_remove, .resume = fsa9480_resume, .suspend = fsa9480_suspend, .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");