/* * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller * * Copyright (C) 2004 Texas Instruments * Copyright (C) 2004 David Brownell * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #undef VERBOSE #define DRIVER_VERSION "24 August 2004" #define DRIVER_NAME (isp1301_driver.driver.name) MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver"); MODULE_LICENSE("GPL"); struct isp1301 { struct usb_phy phy; struct i2c_client *client; void (*i2c_release)(struct device *dev); int irq_type; u32 last_otg_ctrl; unsigned working:1; struct timer_list timer; /* use keventd context to change the state for us */ struct work_struct work; unsigned long todo; # define WORK_UPDATE_ISP 0 /* update ISP from OTG */ # define WORK_UPDATE_OTG 1 /* update OTG from ISP */ # define WORK_HOST_RESUME 4 /* resume host */ # define WORK_TIMER 6 /* timer fired */ # define WORK_STOP 7 /* don't resubmit */ }; /* bits in OTG_CTRL */ #define OTG_XCEIV_OUTPUTS \ (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID) #define OTG_XCEIV_INPUTS \ (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID) #define OTG_CTRL_BITS \ (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP) /* and OTG_PULLUP is sometimes written */ #define OTG_CTRL_MASK (OTG_DRIVER_SEL| \ OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \ OTG_CTRL_BITS) /*-------------------------------------------------------------------------*/ /* board-specific PM hooks */ #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3) #if defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE) #include #else static inline int tps65010_set_vbus_draw(unsigned mA) { pr_debug("tps65010: draw %d mA (STUB)\n", mA); return 0; } #endif static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) { int status = tps65010_set_vbus_draw(mA); if (status < 0) pr_debug(" VBUS %d mA error %d\n", mA, status); } #else static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) { /* H4 controls this by DIP switch S2.4; no soft control. * ON means the charger is always enabled. Leave it OFF * unless the OTG port is used only in B-peripheral mode. */ } #endif static void enable_vbus_source(struct isp1301 *isp) { /* this board won't supply more than 8mA vbus power. * some boards can switch a 100ma "unit load" (or more). */ } /* products will deliver OTG messages with LEDs, GUI, etc */ static inline void notresponding(struct isp1301 *isp) { printk(KERN_NOTICE "OTG device not responding.\n"); } /*-------------------------------------------------------------------------*/ static struct i2c_driver isp1301_driver; /* smbus apis are used for portability */ static inline u8 isp1301_get_u8(struct isp1301 *isp, u8 reg) { return i2c_smbus_read_byte_data(isp->client, reg + 0); } static inline int isp1301_get_u16(struct isp1301 *isp, u8 reg) { return i2c_smbus_read_word_data(isp->client, reg); } static inline int isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits) { return i2c_smbus_write_byte_data(isp->client, reg + 0, bits); } static inline int isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits) { return i2c_smbus_write_byte_data(isp->client, reg + 1, bits); } /*-------------------------------------------------------------------------*/ /* identification */ #define ISP1301_VENDOR_ID 0x00 /* u16 read */ #define ISP1301_PRODUCT_ID 0x02 /* u16 read */ #define ISP1301_BCD_DEVICE 0x14 /* u16 read */ #define I2C_VENDOR_ID_PHILIPS 0x04cc #define I2C_PRODUCT_ID_PHILIPS_1301 0x1301 /* operational registers */ #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */ # define MC1_SPEED (1 << 0) # define MC1_SUSPEND (1 << 1) # define MC1_DAT_SE0 (1 << 2) # define MC1_TRANSPARENT (1 << 3) # define MC1_BDIS_ACON_EN (1 << 4) # define MC1_OE_INT_EN (1 << 5) # define MC1_UART_EN (1 << 6) # define MC1_MASK 0x7f #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */ # define MC2_GLOBAL_PWR_DN (1 << 0) # define MC2_SPD_SUSP_CTRL (1 << 1) # define MC2_BI_DI (1 << 2) # define MC2_TRANSP_BDIR0 (1 << 3) # define MC2_TRANSP_BDIR1 (1 << 4) # define MC2_AUDIO_EN (1 << 5) # define MC2_PSW_EN (1 << 6) # define MC2_EN2V7 (1 << 7) #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */ # define OTG1_DP_PULLUP (1 << 0) # define OTG1_DM_PULLUP (1 << 1) # define OTG1_DP_PULLDOWN (1 << 2) # define OTG1_DM_PULLDOWN (1 << 3) # define OTG1_ID_PULLDOWN (1 << 4) # define OTG1_VBUS_DRV (1 << 5) # define OTG1_VBUS_DISCHRG (1 << 6) # define OTG1_VBUS_CHRG (1 << 7) #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */ # define OTG_B_SESS_END (1 << 6) # define OTG_B_SESS_VLD (1 << 7) #define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */ #define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */ #define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */ #define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */ /* same bitfields in all interrupt registers */ # define INTR_VBUS_VLD (1 << 0) # define INTR_SESS_VLD (1 << 1) # define INTR_DP_HI (1 << 2) # define INTR_ID_GND (1 << 3) # define INTR_DM_HI (1 << 4) # define INTR_ID_FLOAT (1 << 5) # define INTR_BDIS_ACON (1 << 6) # define INTR_CR_INT (1 << 7) /*-------------------------------------------------------------------------*/ static inline const char *state_name(struct isp1301 *isp) { return usb_otg_state_string(isp->phy.otg->state); } /*-------------------------------------------------------------------------*/ /* NOTE: some of this ISP1301 setup is specific to H2 boards; * not everything is guarded by board-specific checks, or even using * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI. * * ALSO: this currently doesn't use ISP1301 low-power modes * while OTG is running. */ static void power_down(struct isp1301 *isp) { isp->phy.otg->state = OTG_STATE_UNDEFINED; // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN); isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); } static void power_up(struct isp1301 *isp) { // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); /* do this only when cpu is driving transceiver, * so host won't see a low speed device... */ isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); } #define NO_HOST_SUSPEND static int host_suspend(struct isp1301 *isp) { #ifdef NO_HOST_SUSPEND return 0; #else struct device *dev; if (!isp->phy.otg->host) return -ENODEV; /* Currently ASSUMES only the OTG port matters; * other ports could be active... */ dev = isp->phy.otg->host->controller; return dev->driver->suspend(dev, 3, 0); #endif } static int host_resume(struct isp1301 *isp) { #ifdef NO_HOST_SUSPEND return 0; #else struct device *dev; if (!isp->phy.otg->host) return -ENODEV; dev = isp->phy.otg->host->controller; return dev->driver->resume(dev, 0); #endif } static int gadget_suspend(struct isp1301 *isp) { isp->phy.otg->gadget->b_hnp_enable = 0; isp->phy.otg->gadget->a_hnp_support = 0; isp->phy.otg->gadget->a_alt_hnp_support = 0; return usb_gadget_vbus_disconnect(isp->phy.otg->gadget); } /*-------------------------------------------------------------------------*/ #define TIMER_MINUTES 10 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ) /* Almost all our I2C messaging comes from a work queue's task context. * NOTE: guaranteeing certain response times might mean we shouldn't * share keventd's work queue; a realtime task might be safest. */ static void isp1301_defer_work(struct isp1301 *isp, int work) { int status; if (isp && !test_and_set_bit(work, &isp->todo)) { (void) get_device(&isp->client->dev); status = schedule_work(&isp->work); if (!status && !isp->working) dev_vdbg(&isp->client->dev, "work item %d may be lost\n", work); } } /* called from irq handlers */ static void a_idle(struct isp1301 *isp, const char *tag) { u32 l; if (isp->phy.otg->state == OTG_STATE_A_IDLE) return; isp->phy.otg->default_a = 1; if (isp->phy.otg->host) { isp->phy.otg->host->is_b_host = 0; host_suspend(isp); } if (isp->phy.otg->gadget) { isp->phy.otg->gadget->is_a_peripheral = 1; gadget_suspend(isp); } isp->phy.otg->state = OTG_STATE_A_IDLE; l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; omap_writel(l, OTG_CTRL); isp->last_otg_ctrl = l; pr_debug(" --> %s/%s\n", state_name(isp), tag); } /* called from irq handlers */ static void b_idle(struct isp1301 *isp, const char *tag) { u32 l; if (isp->phy.otg->state == OTG_STATE_B_IDLE) return; isp->phy.otg->default_a = 0; if (isp->phy.otg->host) { isp->phy.otg->host->is_b_host = 1; host_suspend(isp); } if (isp->phy.otg->gadget) { isp->phy.otg->gadget->is_a_peripheral = 0; gadget_suspend(isp); } isp->phy.otg->state = OTG_STATE_B_IDLE; l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; omap_writel(l, OTG_CTRL); isp->last_otg_ctrl = l; pr_debug(" --> %s/%s\n", state_name(isp), tag); } static void dump_regs(struct isp1301 *isp, const char *label) { u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1); u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS); u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n", omap_readl(OTG_CTRL), label, state_name(isp), ctrl, status, src); /* mode control and irq enables don't change much */ } /*-------------------------------------------------------------------------*/ #ifdef CONFIG_USB_OTG /* * The OMAP OTG controller handles most of the OTG state transitions. * * We translate isp1301 outputs (mostly voltage comparator status) into * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state * flags into isp1301 inputs ... and infer state transitions. */ #ifdef VERBOSE static void check_state(struct isp1301 *isp, const char *tag) { enum usb_otg_state state = OTG_STATE_UNDEFINED; u8 fsm = omap_readw(OTG_TEST) & 0x0ff; unsigned extra = 0; switch (fsm) { /* default-b */ case 0x0: state = OTG_STATE_B_IDLE; break; case 0x3: case 0x7: extra = 1; case 0x1: state = OTG_STATE_B_PERIPHERAL; break; case 0x11: state = OTG_STATE_B_SRP_INIT; break; /* extra dual-role default-b states */ case 0x12: case 0x13: case 0x16: extra = 1; case 0x17: state = OTG_STATE_B_WAIT_ACON; break; case 0x34: state = OTG_STATE_B_HOST; break; /* default-a */ case 0x36: state = OTG_STATE_A_IDLE; break; case 0x3c: state = OTG_STATE_A_WAIT_VFALL; break; case 0x7d: state = OTG_STATE_A_VBUS_ERR; break; case 0x9e: case 0x9f: extra = 1; case 0x89: state = OTG_STATE_A_PERIPHERAL; break; case 0xb7: state = OTG_STATE_A_WAIT_VRISE; break; case 0xb8: state = OTG_STATE_A_WAIT_BCON; break; case 0xb9: state = OTG_STATE_A_HOST; break; case 0xba: state = OTG_STATE_A_SUSPEND; break; default: break; } if (isp->phy.otg->state == state && !extra) return; pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag, usb_otg_state_string(state), fsm, state_name(isp), omap_readl(OTG_CTRL)); } #else static inline void check_state(struct isp1301 *isp, const char *tag) { } #endif /* outputs from ISP1301_INTERRUPT_SOURCE */ static void update_otg1(struct isp1301 *isp, u8 int_src) { u32 otg_ctrl; otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; otg_ctrl &= ~OTG_XCEIV_INPUTS; otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD); if (int_src & INTR_SESS_VLD) otg_ctrl |= OTG_ASESSVLD; else if (isp->phy.otg->state == OTG_STATE_A_WAIT_VFALL) { a_idle(isp, "vfall"); otg_ctrl &= ~OTG_CTRL_BITS; } if (int_src & INTR_VBUS_VLD) otg_ctrl |= OTG_VBUSVLD; if (int_src & INTR_ID_GND) { /* default-A */ if (isp->phy.otg->state == OTG_STATE_B_IDLE || isp->phy.otg->state == OTG_STATE_UNDEFINED) { a_idle(isp, "init"); return; } } else { /* default-B */ otg_ctrl |= OTG_ID; if (isp->phy.otg->state == OTG_STATE_A_IDLE || isp->phy.otg->state == OTG_STATE_UNDEFINED) { b_idle(isp, "init"); return; } } omap_writel(otg_ctrl, OTG_CTRL); } /* outputs from ISP1301_OTG_STATUS */ static void update_otg2(struct isp1301 *isp, u8 otg_status) { u32 otg_ctrl; otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; otg_ctrl &= ~OTG_XCEIV_INPUTS; otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND); if (otg_status & OTG_B_SESS_VLD) otg_ctrl |= OTG_BSESSVLD; else if (otg_status & OTG_B_SESS_END) otg_ctrl |= OTG_BSESSEND; omap_writel(otg_ctrl, OTG_CTRL); } /* inputs going to ISP1301 */ static void otg_update_isp(struct isp1301 *isp) { u32 otg_ctrl, otg_change; u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP; otg_ctrl = omap_readl(OTG_CTRL); otg_change = otg_ctrl ^ isp->last_otg_ctrl; isp->last_otg_ctrl = otg_ctrl; otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS; switch (isp->phy.otg->state) { case OTG_STATE_B_IDLE: case OTG_STATE_B_PERIPHERAL: case OTG_STATE_B_SRP_INIT: if (!(otg_ctrl & OTG_PULLUP)) { // if (otg_ctrl & OTG_B_HNPEN) { if (isp->phy.otg->gadget->b_hnp_enable) { isp->phy.otg->state = OTG_STATE_B_WAIT_ACON; pr_debug(" --> b_wait_acon\n"); } goto pulldown; } pullup: set |= OTG1_DP_PULLUP; clr |= OTG1_DP_PULLDOWN; break; case OTG_STATE_A_SUSPEND: case OTG_STATE_A_PERIPHERAL: if (otg_ctrl & OTG_PULLUP) goto pullup; /* FALLTHROUGH */ // case OTG_STATE_B_WAIT_ACON: default: pulldown: set |= OTG1_DP_PULLDOWN; clr |= OTG1_DP_PULLUP; break; } # define toggle(OTG,ISP) do { \ if (otg_ctrl & OTG) set |= ISP; \ else clr |= ISP; \ } while (0) if (!(isp->phy.otg->host)) otg_ctrl &= ~OTG_DRV_VBUS; switch (isp->phy.otg->state) { case OTG_STATE_A_SUSPEND: if (otg_ctrl & OTG_DRV_VBUS) { set |= OTG1_VBUS_DRV; break; } /* HNP failed for some reason (A_AIDL_BDIS timeout) */ notresponding(isp); /* FALLTHROUGH */ case OTG_STATE_A_VBUS_ERR: isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; pr_debug(" --> a_wait_vfall\n"); /* FALLTHROUGH */ case OTG_STATE_A_WAIT_VFALL: /* FIXME usbcore thinks port power is still on ... */ clr |= OTG1_VBUS_DRV; break; case OTG_STATE_A_IDLE: if (otg_ctrl & OTG_DRV_VBUS) { isp->phy.otg->state = OTG_STATE_A_WAIT_VRISE; pr_debug(" --> a_wait_vrise\n"); } /* FALLTHROUGH */ default: toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV); } toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG); toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG); # undef toggle isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set); isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr); /* HNP switch to host or peripheral; and SRP */ if (otg_change & OTG_PULLUP) { u32 l; switch (isp->phy.otg->state) { case OTG_STATE_B_IDLE: if (clr & OTG1_DP_PULLUP) break; isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; pr_debug(" --> b_peripheral\n"); break; case OTG_STATE_A_SUSPEND: if (clr & OTG1_DP_PULLUP) break; isp->phy.otg->state = OTG_STATE_A_PERIPHERAL; pr_debug(" --> a_peripheral\n"); break; default: break; } l = omap_readl(OTG_CTRL); l |= OTG_PULLUP; omap_writel(l, OTG_CTRL); } check_state(isp, __func__); dump_regs(isp, "otg->isp1301"); } static irqreturn_t omap_otg_irq(int irq, void *_isp) { u16 otg_irq = omap_readw(OTG_IRQ_SRC); u32 otg_ctrl; int ret = IRQ_NONE; struct isp1301 *isp = _isp; struct usb_otg *otg = isp->phy.otg; /* update ISP1301 transceiver from OTG controller */ if (otg_irq & OPRT_CHG) { omap_writew(OPRT_CHG, OTG_IRQ_SRC); isp1301_defer_work(isp, WORK_UPDATE_ISP); ret = IRQ_HANDLED; /* SRP to become b_peripheral failed */ } else if (otg_irq & B_SRP_TMROUT) { pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL)); notresponding(isp); /* gadget drivers that care should monitor all kinds of * remote wakeup (SRP, normal) using their own timer * to give "check cable and A-device" messages. */ if (isp->phy.otg->state == OTG_STATE_B_SRP_INIT) b_idle(isp, "srp_timeout"); omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC); ret = IRQ_HANDLED; /* HNP to become b_host failed */ } else if (otg_irq & B_HNP_FAIL) { pr_debug("otg: %s B_HNP_FAIL, %06x\n", state_name(isp), omap_readl(OTG_CTRL)); notresponding(isp); otg_ctrl = omap_readl(OTG_CTRL); otg_ctrl |= OTG_BUSDROP; otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; omap_writel(otg_ctrl, OTG_CTRL); /* subset of b_peripheral()... */ isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; pr_debug(" --> b_peripheral\n"); omap_writew(B_HNP_FAIL, OTG_IRQ_SRC); ret = IRQ_HANDLED; /* detect SRP from B-device ... */ } else if (otg_irq & A_SRP_DETECT) { pr_debug("otg: %s SRP_DETECT, %06x\n", state_name(isp), omap_readl(OTG_CTRL)); isp1301_defer_work(isp, WORK_UPDATE_OTG); switch (isp->phy.otg->state) { case OTG_STATE_A_IDLE: if (!otg->host) break; isp1301_defer_work(isp, WORK_HOST_RESUME); otg_ctrl = omap_readl(OTG_CTRL); otg_ctrl |= OTG_A_BUSREQ; otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ) & ~OTG_XCEIV_INPUTS & OTG_CTRL_MASK; omap_writel(otg_ctrl, OTG_CTRL); break; default: break; } omap_writew(A_SRP_DETECT, OTG_IRQ_SRC); ret = IRQ_HANDLED; /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise) * we don't track them separately */ } else if (otg_irq & A_REQ_TMROUT) { otg_ctrl = omap_readl(OTG_CTRL); pr_info("otg: BCON_TMOUT from %s, %06x\n", state_name(isp), otg_ctrl); notresponding(isp); otg_ctrl |= OTG_BUSDROP; otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; omap_writel(otg_ctrl, OTG_CTRL); isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC); ret = IRQ_HANDLED; /* A-supplied voltage fell too low; overcurrent */ } else if (otg_irq & A_VBUS_ERR) { otg_ctrl = omap_readl(OTG_CTRL); printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n", state_name(isp), otg_irq, otg_ctrl); otg_ctrl |= OTG_BUSDROP; otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; omap_writel(otg_ctrl, OTG_CTRL); isp->phy.otg->state = OTG_STATE_A_VBUS_ERR; omap_writew(A_VBUS_ERR, OTG_IRQ_SRC); ret = IRQ_HANDLED; /* switch driver; the transceiver code activates it, * ungating the udc clock or resuming OHCI. */ } else if (otg_irq & DRIVER_SWITCH) { int kick = 0; otg_ctrl = omap_readl(OTG_CTRL); printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n", state_name(isp), (otg_ctrl & OTG_DRIVER_SEL) ? "gadget" : "host", otg_ctrl); isp1301_defer_work(isp, WORK_UPDATE_ISP); /* role is peripheral */ if (otg_ctrl & OTG_DRIVER_SEL) { switch (isp->phy.otg->state) { case OTG_STATE_A_IDLE: b_idle(isp, __func__); break; default: break; } isp1301_defer_work(isp, WORK_UPDATE_ISP); /* role is host */ } else { if (!(otg_ctrl & OTG_ID)) { otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL); } if (otg->host) { switch (isp->phy.otg->state) { case OTG_STATE_B_WAIT_ACON: isp->phy.otg->state = OTG_STATE_B_HOST; pr_debug(" --> b_host\n"); kick = 1; break; case OTG_STATE_A_WAIT_BCON: isp->phy.otg->state = OTG_STATE_A_HOST; pr_debug(" --> a_host\n"); break; case OTG_STATE_A_PERIPHERAL: isp->phy.otg->state = OTG_STATE_A_WAIT_BCON; pr_debug(" --> a_wait_bcon\n"); break; default: break; } isp1301_defer_work(isp, WORK_HOST_RESUME); } } omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC); ret = IRQ_HANDLED; if (kick) usb_bus_start_enum(otg->host, otg->host->otg_port); } check_state(isp, __func__); return ret; } static struct platform_device *otg_dev; static int isp1301_otg_init(struct isp1301 *isp) { u32 l; if (!otg_dev) return -ENODEV; dump_regs(isp, __func__); /* some of these values are board-specific... */ l = omap_readl(OTG_SYSCON_2); l |= OTG_EN /* for B-device: */ | SRP_GPDATA /* 9msec Bdev D+ pulse */ | SRP_GPDVBUS /* discharge after VBUS pulse */ // | (3 << 24) /* 2msec VBUS pulse */ /* for A-device: */ | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */ | SRP_DPW /* detect 167+ns SRP pulses */ | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */ ; omap_writel(l, OTG_SYSCON_2); update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE)); update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS)); check_state(isp, __func__); pr_debug("otg: %s, %s %06x\n", state_name(isp), __func__, omap_readl(OTG_CTRL)); omap_writew(DRIVER_SWITCH | OPRT_CHG | B_SRP_TMROUT | B_HNP_FAIL | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN); l = omap_readl(OTG_SYSCON_2); l |= OTG_EN; omap_writel(l, OTG_SYSCON_2); return 0; } static int otg_probe(struct platform_device *dev) { // struct omap_usb_config *config = dev->platform_data; otg_dev = dev; return 0; } static int otg_remove(struct platform_device *dev) { otg_dev = NULL; return 0; } static struct platform_driver omap_otg_driver = { .probe = otg_probe, .remove = otg_remove, .driver = { .owner = THIS_MODULE, .name = "omap_otg", }, }; static int otg_bind(struct isp1301 *isp) { int status; if (otg_dev) return -EBUSY; status = platform_driver_register(&omap_otg_driver); if (status < 0) return status; if (otg_dev) status = request_irq(otg_dev->resource[1].start, omap_otg_irq, 0, DRIVER_NAME, isp); else status = -ENODEV; if (status < 0) platform_driver_unregister(&omap_otg_driver); return status; } static void otg_unbind(struct isp1301 *isp) { if (!otg_dev) return; free_irq(otg_dev->resource[1].start, isp); } #else /* OTG controller isn't clocked */ #endif /* CONFIG_USB_OTG */ /*-------------------------------------------------------------------------*/ static void b_peripheral(struct isp1301 *isp) { u32 l; l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; omap_writel(l, OTG_CTRL); usb_gadget_vbus_connect(isp->phy.otg->gadget); #ifdef CONFIG_USB_OTG enable_vbus_draw(isp, 8); otg_update_isp(isp); #else enable_vbus_draw(isp, 100); /* UDC driver just set OTG_BSESSVLD */ isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP); isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN); isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; pr_debug(" --> b_peripheral\n"); dump_regs(isp, "2periph"); #endif } static void isp_update_otg(struct isp1301 *isp, u8 stat) { struct usb_otg *otg = isp->phy.otg; u8 isp_stat, isp_bstat; enum usb_otg_state state = isp->phy.otg->state; if (stat & INTR_BDIS_ACON) pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp)); /* start certain state transitions right away */ isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); if (isp_stat & INTR_ID_GND) { if (otg->default_a) { switch (state) { case OTG_STATE_B_IDLE: a_idle(isp, "idle"); /* FALLTHROUGH */ case OTG_STATE_A_IDLE: enable_vbus_source(isp); /* FALLTHROUGH */ case OTG_STATE_A_WAIT_VRISE: /* we skip over OTG_STATE_A_WAIT_BCON, since * the HC will transition to A_HOST (or * A_SUSPEND!) without our noticing except * when HNP is used. */ if (isp_stat & INTR_VBUS_VLD) isp->phy.otg->state = OTG_STATE_A_HOST; break; case OTG_STATE_A_WAIT_VFALL: if (!(isp_stat & INTR_SESS_VLD)) a_idle(isp, "vfell"); break; default: if (!(isp_stat & INTR_VBUS_VLD)) isp->phy.otg->state = OTG_STATE_A_VBUS_ERR; break; } isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS); } else { switch (state) { case OTG_STATE_B_PERIPHERAL: case OTG_STATE_B_HOST: case OTG_STATE_B_WAIT_ACON: usb_gadget_vbus_disconnect(otg->gadget); break; default: break; } if (state != OTG_STATE_A_IDLE) a_idle(isp, "id"); if (otg->host && state == OTG_STATE_A_IDLE) isp1301_defer_work(isp, WORK_HOST_RESUME); isp_bstat = 0; } } else { u32 l; /* if user unplugged mini-A end of cable, * don't bypass A_WAIT_VFALL. */ if (otg->default_a) { switch (state) { default: isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; break; case OTG_STATE_A_WAIT_VFALL: state = OTG_STATE_A_IDLE; /* khubd may take a while to notice and * handle this disconnect, so don't go * to B_IDLE quite yet. */ break; case OTG_STATE_A_IDLE: host_suspend(isp); isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_BDIS_ACON_EN); isp->phy.otg->state = OTG_STATE_B_IDLE; l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; l &= ~OTG_CTRL_BITS; omap_writel(l, OTG_CTRL); break; case OTG_STATE_B_IDLE: break; } } isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS); switch (isp->phy.otg->state) { case OTG_STATE_B_PERIPHERAL: case OTG_STATE_B_WAIT_ACON: case OTG_STATE_B_HOST: if (likely(isp_bstat & OTG_B_SESS_VLD)) break; enable_vbus_draw(isp, 0); #ifndef CONFIG_USB_OTG /* UDC driver will clear OTG_BSESSVLD */ isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN); isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP); dump_regs(isp, __func__); #endif /* FALLTHROUGH */ case OTG_STATE_B_SRP_INIT: b_idle(isp, __func__); l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; omap_writel(l, OTG_CTRL); /* FALLTHROUGH */ case OTG_STATE_B_IDLE: if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) { #ifdef CONFIG_USB_OTG update_otg1(isp, isp_stat); update_otg2(isp, isp_bstat); #endif b_peripheral(isp); } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD))) isp_bstat |= OTG_B_SESS_END; break; case OTG_STATE_A_WAIT_VFALL: break; default: pr_debug("otg: unsupported b-device %s\n", state_name(isp)); break; } } if (state != isp->phy.otg->state) pr_debug(" isp, %s -> %s\n", usb_otg_state_string(state), state_name(isp)); #ifdef CONFIG_USB_OTG /* update the OTG controller state to match the isp1301; may * trigger OPRT_CHG irqs for changes going to the isp1301. */ update_otg1(isp, isp_stat); update_otg2(isp, isp_bstat); check_state(isp, __func__); #endif dump_regs(isp, "isp1301->otg"); } /*-------------------------------------------------------------------------*/ static u8 isp1301_clear_latch(struct isp1301 *isp) { u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH); isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch); return latch; } static void isp1301_work(struct work_struct *work) { struct isp1301 *isp = container_of(work, struct isp1301, work); int stop; /* implicit lock: we're the only task using this device */ isp->working = 1; do { stop = test_bit(WORK_STOP, &isp->todo); #ifdef CONFIG_USB_OTG /* transfer state from otg engine to isp1301 */ if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) { otg_update_isp(isp); put_device(&isp->client->dev); } #endif /* transfer state from isp1301 to otg engine */ if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) { u8 stat = isp1301_clear_latch(isp); isp_update_otg(isp, stat); put_device(&isp->client->dev); } if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) { u32 otg_ctrl; /* * skip A_WAIT_VRISE; hc transitions invisibly * skip A_WAIT_BCON; same. */ switch (isp->phy.otg->state) { case OTG_STATE_A_WAIT_BCON: case OTG_STATE_A_WAIT_VRISE: isp->phy.otg->state = OTG_STATE_A_HOST; pr_debug(" --> a_host\n"); otg_ctrl = omap_readl(OTG_CTRL); otg_ctrl |= OTG_A_BUSREQ; otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ) & OTG_CTRL_MASK; omap_writel(otg_ctrl, OTG_CTRL); break; case OTG_STATE_B_WAIT_ACON: isp->phy.otg->state = OTG_STATE_B_HOST; pr_debug(" --> b_host (acon)\n"); break; case OTG_STATE_B_HOST: case OTG_STATE_B_IDLE: case OTG_STATE_A_IDLE: break; default: pr_debug(" host resume in %s\n", state_name(isp)); } host_resume(isp); // mdelay(10); put_device(&isp->client->dev); } if (test_and_clear_bit(WORK_TIMER, &isp->todo)) { #ifdef VERBOSE dump_regs(isp, "timer"); if (!stop) mod_timer(&isp->timer, jiffies + TIMER_JIFFIES); #endif put_device(&isp->client->dev); } if (isp->todo) dev_vdbg(&isp->client->dev, "work done, todo = 0x%lx\n", isp->todo); if (stop) { dev_dbg(&isp->client->dev, "stop\n"); break; } } while (isp->todo); isp->working = 0; } static irqreturn_t isp1301_irq(int irq, void *isp) { isp1301_defer_work(isp, WORK_UPDATE_OTG); return IRQ_HANDLED; } static void isp1301_timer(unsigned long _isp) { isp1301_defer_work((void *)_isp, WORK_TIMER); } /*-------------------------------------------------------------------------*/ static void isp1301_release(struct device *dev) { struct isp1301 *isp; isp = dev_get_drvdata(dev); /* FIXME -- not with a "new style" driver, it doesn't!! */ /* ugly -- i2c hijacks our memory hook to wait_for_completion() */ if (isp->i2c_release) isp->i2c_release(dev); kfree(isp->phy.otg); kfree (isp); } static struct isp1301 *the_transceiver; static int isp1301_remove(struct i2c_client *i2c) { struct isp1301 *isp; isp = i2c_get_clientdata(i2c); isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0); isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0); free_irq(i2c->irq, isp); #ifdef CONFIG_USB_OTG otg_unbind(isp); #endif if (machine_is_omap_h2()) gpio_free(2); isp->timer.data = 0; set_bit(WORK_STOP, &isp->todo); del_timer_sync(&isp->timer); flush_work(&isp->work); put_device(&i2c->dev); the_transceiver = NULL; return 0; } /*-------------------------------------------------------------------------*/ /* NOTE: three modes are possible here, only one of which * will be standards-conformant on any given system: * * - OTG mode (dual-role), required if there's a Mini-AB connector * - HOST mode, for when there's one or more A (host) connectors * - DEVICE mode, for when there's a B/Mini-B (device) connector * * As a rule, you won't have an isp1301 chip unless it's there to * support the OTG mode. Other modes help testing USB controllers * in isolation from (full) OTG support, or maybe so later board * revisions can help to support those feature. */ #ifdef CONFIG_USB_OTG static int isp1301_otg_enable(struct isp1301 *isp) { power_up(isp); isp1301_otg_init(isp); /* NOTE: since we don't change this, this provides * a few more interrupts than are strictly needed. */ isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND); isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND); dev_info(&isp->client->dev, "ready for dual-role USB ...\n"); return 0; } #endif /* add or disable the host device+driver */ static int isp1301_set_host(struct usb_otg *otg, struct usb_bus *host) { struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); if (isp != the_transceiver) return -ENODEV; if (!host) { omap_writew(0, OTG_IRQ_EN); power_down(isp); otg->host = NULL; return 0; } #ifdef CONFIG_USB_OTG otg->host = host; dev_dbg(&isp->client->dev, "registered host\n"); host_suspend(isp); if (otg->gadget) return isp1301_otg_enable(isp); return 0; #elif !IS_ENABLED(CONFIG_USB_OMAP) // FIXME update its refcount otg->host = host; power_up(isp); if (machine_is_omap_h2()) isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); dev_info(&isp->client->dev, "A-Host sessions ok\n"); isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, INTR_ID_GND); isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, INTR_ID_GND); /* If this has a Mini-AB connector, this mode is highly * nonstandard ... but can be handy for testing, especially with * the Mini-A end of an OTG cable. (Or something nonstandard * like MiniB-to-StandardB, maybe built with a gender mender.) */ isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV); dump_regs(isp, __func__); return 0; #else dev_dbg(&isp->client->dev, "host sessions not allowed\n"); return -EINVAL; #endif } static int isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) { struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); if (isp != the_transceiver) return -ENODEV; if (!gadget) { omap_writew(0, OTG_IRQ_EN); if (!otg->default_a) enable_vbus_draw(isp, 0); usb_gadget_vbus_disconnect(otg->gadget); otg->gadget = NULL; power_down(isp); return 0; } #ifdef CONFIG_USB_OTG otg->gadget = gadget; dev_dbg(&isp->client->dev, "registered gadget\n"); /* gadget driver may be suspended until vbus_connect () */ if (otg->host) return isp1301_otg_enable(isp); return 0; #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE) otg->gadget = gadget; // FIXME update its refcount { u32 l; l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS); l |= OTG_ID; omap_writel(l, OTG_CTRL); } power_up(isp); isp->phy.otg->state = OTG_STATE_B_IDLE; if (machine_is_omap_h2() || machine_is_omap_h3()) isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, INTR_SESS_VLD); isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, INTR_VBUS_VLD); dev_info(&isp->client->dev, "B-Peripheral sessions ok\n"); dump_regs(isp, __func__); /* If this has a Mini-AB connector, this mode is highly * nonstandard ... but can be handy for testing, so long * as you don't plug a Mini-A cable into the jack. */ if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD) b_peripheral(isp); return 0; #else dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n"); return -EINVAL; #endif } /*-------------------------------------------------------------------------*/ static int isp1301_set_power(struct usb_phy *dev, unsigned mA) { if (!the_transceiver) return -ENODEV; if (dev->otg->state == OTG_STATE_B_PERIPHERAL) enable_vbus_draw(the_transceiver, mA); return 0; } static int isp1301_start_srp(struct usb_otg *otg) { struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); u32 otg_ctrl; if (isp != the_transceiver || isp->phy.otg->state != OTG_STATE_B_IDLE) return -ENODEV; otg_ctrl = omap_readl(OTG_CTRL); if (!(otg_ctrl & OTG_BSESSEND)) return -EINVAL; otg_ctrl |= OTG_B_BUSREQ; otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK; omap_writel(otg_ctrl, OTG_CTRL); isp->phy.otg->state = OTG_STATE_B_SRP_INIT; pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), omap_readl(OTG_CTRL)); #ifdef CONFIG_USB_OTG check_state(isp, __func__); #endif return 0; } static int isp1301_start_hnp(struct usb_otg *otg) { #ifdef CONFIG_USB_OTG struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); u32 l; if (isp != the_transceiver) return -ENODEV; if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable)) return -ENOTCONN; if (!otg->default_a && (otg->gadget == NULL || !otg->gadget->b_hnp_enable)) return -ENOTCONN; /* We want hardware to manage most HNP protocol timings. * So do this part as early as possible... */ switch (isp->phy.otg->state) { case OTG_STATE_B_HOST: isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; /* caller will suspend next */ break; case OTG_STATE_A_HOST: #if 0 /* autoconnect mode avoids irq latency bugs */ isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_BDIS_ACON_EN); #endif /* caller must suspend then clear A_BUSREQ */ usb_gadget_vbus_connect(otg->gadget); l = omap_readl(OTG_CTRL); l |= OTG_A_SETB_HNPEN; omap_writel(l, OTG_CTRL); break; case OTG_STATE_A_PERIPHERAL: /* initiated by B-Host suspend */ break; default: return -EILSEQ; } pr_debug("otg: HNP %s, %06x ...\n", state_name(isp), omap_readl(OTG_CTRL)); check_state(isp, __func__); return 0; #else /* srp-only */ return -EINVAL; #endif } /*-------------------------------------------------------------------------*/ static int isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { int status; struct isp1301 *isp; if (the_transceiver) return 0; isp = kzalloc(sizeof *isp, GFP_KERNEL); if (!isp) return 0; isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL); if (!isp->phy.otg) { kfree(isp); return 0; } INIT_WORK(&isp->work, isp1301_work); init_timer(&isp->timer); isp->timer.function = isp1301_timer; isp->timer.data = (unsigned long) isp; i2c_set_clientdata(i2c, isp); isp->client = i2c; /* verify the chip (shouldn't be necessary) */ status = isp1301_get_u16(isp, ISP1301_VENDOR_ID); if (status != I2C_VENDOR_ID_PHILIPS) { dev_dbg(&i2c->dev, "not philips id: %d\n", status); goto fail; } status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID); if (status != I2C_PRODUCT_ID_PHILIPS_1301) { dev_dbg(&i2c->dev, "not isp1301, %d\n", status); goto fail; } isp->i2c_release = i2c->dev.release; i2c->dev.release = isp1301_release; /* initial development used chiprev 2.00 */ status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE); dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n", status >> 8, status & 0xff); /* make like power-on reset */ isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK); isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI); isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI); isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN); isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN)); isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0); isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0); isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0); #ifdef CONFIG_USB_OTG status = otg_bind(isp); if (status < 0) { dev_dbg(&i2c->dev, "can't bind OTG\n"); goto fail; } #endif if (machine_is_omap_h2()) { /* full speed signaling by default */ isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SPEED); isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_SPD_SUSP_CTRL); /* IRQ wired at M14 */ omap_cfg_reg(M14_1510_GPIO2); if (gpio_request(2, "isp1301") == 0) gpio_direction_input(2); isp->irq_type = IRQF_TRIGGER_FALLING; } status = request_irq(i2c->irq, isp1301_irq, isp->irq_type, DRIVER_NAME, isp); if (status < 0) { dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n", i2c->irq, status); goto fail; } isp->phy.dev = &i2c->dev; isp->phy.label = DRIVER_NAME; isp->phy.set_power = isp1301_set_power, isp->phy.otg->usb_phy = &isp->phy; isp->phy.otg->set_host = isp1301_set_host, isp->phy.otg->set_peripheral = isp1301_set_peripheral, isp->phy.otg->start_srp = isp1301_start_srp, isp->phy.otg->start_hnp = isp1301_start_hnp, enable_vbus_draw(isp, 0); power_down(isp); the_transceiver = isp; #ifdef CONFIG_USB_OTG update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE)); update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS)); #endif dump_regs(isp, __func__); #ifdef VERBOSE mod_timer(&isp->timer, jiffies + TIMER_JIFFIES); dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES); #endif status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2); if (status < 0) dev_err(&i2c->dev, "can't register transceiver, %d\n", status); return 0; fail: kfree(isp->phy.otg); kfree(isp); return -ENODEV; } static const struct i2c_device_id isp1301_id[] = { { "isp1301_omap", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, isp1301_id); static struct i2c_driver isp1301_driver = { .driver = { .name = "isp1301_omap", }, .probe = isp1301_probe, .remove = isp1301_remove, .id_table = isp1301_id, }; /*-------------------------------------------------------------------------*/ static int __init isp_init(void) { return i2c_add_driver(&isp1301_driver); } subsys_initcall(isp_init); static void __exit isp_exit(void) { if (the_transceiver) usb_remove_phy(&the_transceiver->phy); i2c_del_driver(&isp1301_driver); } module_exit(isp_exit);