514 lines
12 KiB
C
514 lines
12 KiB
C
/*
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* ISP1704 USB Charger Detection driver
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/delay.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/ulpi.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/power/isp1704_charger.h>
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/* Vendor specific Power Control register */
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#define ISP1704_PWR_CTRL 0x3d
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#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
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#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
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#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
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#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
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#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
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#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
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#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
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#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
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#define NXP_VENDOR_ID 0x04cc
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static u16 isp170x_id[] = {
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0x1704,
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0x1707,
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};
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struct isp1704_charger {
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struct device *dev;
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struct power_supply psy;
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struct usb_phy *phy;
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struct notifier_block nb;
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struct work_struct work;
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/* properties */
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char model[8];
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unsigned present:1;
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unsigned online:1;
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unsigned current_max;
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/* temp storage variables */
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unsigned long event;
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unsigned max_power;
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};
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static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
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{
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return usb_phy_io_read(isp->phy, reg);
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}
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static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
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{
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return usb_phy_io_write(isp->phy, val, reg);
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}
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/*
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* Disable/enable the power from the isp1704 if a function for it
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* has been provided with platform data.
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*/
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static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
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{
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struct isp1704_charger_data *board = isp->dev->platform_data;
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if (board && board->set_power)
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board->set_power(on);
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}
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/*
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* Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
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* chargers).
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*
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* REVISIT: The method is defined in Battery Charging Specification and is
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* applicable to any ULPI transceiver. Nothing isp170x specific here.
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*/
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static inline int isp1704_charger_type(struct isp1704_charger *isp)
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{
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u8 reg;
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u8 func_ctrl;
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u8 otg_ctrl;
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int type = POWER_SUPPLY_TYPE_USB_DCP;
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func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
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otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
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/* disable pulldowns */
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reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
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isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
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/* full speed */
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isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
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ULPI_FUNC_CTRL_XCVRSEL_MASK);
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isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
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ULPI_FUNC_CTRL_FULL_SPEED);
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/* Enable strong pull-up on DP (1.5K) and reset */
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reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
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isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
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usleep_range(1000, 2000);
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reg = isp1704_read(isp, ULPI_DEBUG);
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if ((reg & 3) != 3)
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type = POWER_SUPPLY_TYPE_USB_CDP;
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/* recover original state */
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isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
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isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
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return type;
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}
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/*
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* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
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* is actually a dedicated charger, the following steps need to be taken.
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*/
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static inline int isp1704_charger_verify(struct isp1704_charger *isp)
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{
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int ret = 0;
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u8 r;
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/* Reset the transceiver */
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r = isp1704_read(isp, ULPI_FUNC_CTRL);
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r |= ULPI_FUNC_CTRL_RESET;
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isp1704_write(isp, ULPI_FUNC_CTRL, r);
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usleep_range(1000, 2000);
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/* Set normal mode */
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r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
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isp1704_write(isp, ULPI_FUNC_CTRL, r);
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/* Clear the DP and DM pull-down bits */
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r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
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isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
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/* Enable strong pull-up on DP (1.5K) and reset */
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r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
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isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
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usleep_range(1000, 2000);
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/* Read the line state */
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if (!isp1704_read(isp, ULPI_DEBUG)) {
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/* Disable strong pull-up on DP (1.5K) */
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isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
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ULPI_FUNC_CTRL_TERMSELECT);
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return 1;
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}
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/* Is it a charger or PS/2 connection */
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/* Enable weak pull-up resistor on DP */
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isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
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ISP1704_PWR_CTRL_DP_WKPU_EN);
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/* Disable strong pull-up on DP (1.5K) */
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isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
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ULPI_FUNC_CTRL_TERMSELECT);
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/* Enable weak pull-down resistor on DM */
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isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
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ULPI_OTG_CTRL_DM_PULLDOWN);
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/* It's a charger if the line states are clear */
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if (!(isp1704_read(isp, ULPI_DEBUG)))
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ret = 1;
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/* Disable weak pull-up resistor on DP */
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isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
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ISP1704_PWR_CTRL_DP_WKPU_EN);
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return ret;
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}
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static inline int isp1704_charger_detect(struct isp1704_charger *isp)
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{
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unsigned long timeout;
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u8 pwr_ctrl;
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int ret = 0;
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pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
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/* set SW control bit in PWR_CTRL register */
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isp1704_write(isp, ISP1704_PWR_CTRL,
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ISP1704_PWR_CTRL_SWCTRL);
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/* enable manual charger detection */
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isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
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ISP1704_PWR_CTRL_SWCTRL
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| ISP1704_PWR_CTRL_DPVSRC_EN);
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usleep_range(1000, 2000);
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timeout = jiffies + msecs_to_jiffies(300);
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do {
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/* Check if there is a charger */
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if (isp1704_read(isp, ISP1704_PWR_CTRL)
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& ISP1704_PWR_CTRL_VDAT_DET) {
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ret = isp1704_charger_verify(isp);
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break;
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}
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} while (!time_after(jiffies, timeout) && isp->online);
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/* recover original state */
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isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
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return ret;
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}
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static void isp1704_charger_work(struct work_struct *data)
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{
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int detect;
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unsigned long event;
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unsigned power;
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struct isp1704_charger *isp =
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container_of(data, struct isp1704_charger, work);
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static DEFINE_MUTEX(lock);
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event = isp->event;
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power = isp->max_power;
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mutex_lock(&lock);
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if (event != USB_EVENT_NONE)
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isp1704_charger_set_power(isp, 1);
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switch (event) {
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case USB_EVENT_VBUS:
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isp->online = true;
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/* detect charger */
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detect = isp1704_charger_detect(isp);
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if (detect) {
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isp->present = detect;
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isp->psy.type = isp1704_charger_type(isp);
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}
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switch (isp->psy.type) {
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case POWER_SUPPLY_TYPE_USB_DCP:
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isp->current_max = 1800;
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break;
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case POWER_SUPPLY_TYPE_USB_CDP:
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/*
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* Only 500mA here or high speed chirp
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* handshaking may break
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*/
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isp->current_max = 500;
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/* FALLTHROUGH */
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case POWER_SUPPLY_TYPE_USB:
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default:
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/* enable data pullups */
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if (isp->phy->otg->gadget)
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usb_gadget_connect(isp->phy->otg->gadget);
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}
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break;
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case USB_EVENT_NONE:
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isp->online = false;
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isp->current_max = 0;
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isp->present = 0;
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isp->current_max = 0;
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isp->psy.type = POWER_SUPPLY_TYPE_USB;
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/*
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* Disable data pullups. We need to prevent the controller from
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* enumerating.
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*
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* FIXME: This is here to allow charger detection with Host/HUB
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* chargers. The pullups may be enabled elsewhere, so this can
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* not be the final solution.
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*/
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if (isp->phy->otg->gadget)
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usb_gadget_disconnect(isp->phy->otg->gadget);
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isp1704_charger_set_power(isp, 0);
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break;
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case USB_EVENT_ENUMERATED:
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if (isp->present)
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isp->current_max = 1800;
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else
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isp->current_max = power;
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break;
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default:
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goto out;
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}
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power_supply_changed(&isp->psy);
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out:
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mutex_unlock(&lock);
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}
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static int isp1704_notifier_call(struct notifier_block *nb,
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unsigned long event, void *power)
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{
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struct isp1704_charger *isp =
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container_of(nb, struct isp1704_charger, nb);
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isp->event = event;
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if (power)
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isp->max_power = *((unsigned *)power);
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schedule_work(&isp->work);
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return NOTIFY_OK;
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}
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static int isp1704_charger_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct isp1704_charger *isp =
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container_of(psy, struct isp1704_charger, psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = isp->present;
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = isp->online;
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break;
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case POWER_SUPPLY_PROP_CURRENT_MAX:
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val->intval = isp->current_max;
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = isp->model;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = "NXP";
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property power_props[] = {
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_CURRENT_MAX,
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
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{
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int vendor;
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int product;
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int i;
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int ret = -ENODEV;
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/* Test ULPI interface */
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ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
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if (ret < 0)
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return ret;
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ret = isp1704_read(isp, ULPI_SCRATCH);
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if (ret < 0)
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return ret;
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if (ret != 0xaa)
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return -ENODEV;
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/* Verify the product and vendor id matches */
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vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
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vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
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if (vendor != NXP_VENDOR_ID)
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return -ENODEV;
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product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
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product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
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for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
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if (product == isp170x_id[i]) {
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sprintf(isp->model, "isp%x", product);
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return product;
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}
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}
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dev_err(isp->dev, "product id %x not matching known ids", product);
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return -ENODEV;
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}
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static int __devinit isp1704_charger_probe(struct platform_device *pdev)
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{
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struct isp1704_charger *isp;
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int ret = -ENODEV;
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isp = kzalloc(sizeof *isp, GFP_KERNEL);
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if (!isp)
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return -ENOMEM;
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isp->phy = usb_get_transceiver();
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if (!isp->phy)
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goto fail0;
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isp->dev = &pdev->dev;
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platform_set_drvdata(pdev, isp);
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isp1704_charger_set_power(isp, 1);
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ret = isp1704_test_ulpi(isp);
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if (ret < 0)
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goto fail1;
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isp->psy.name = "isp1704";
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isp->psy.type = POWER_SUPPLY_TYPE_USB;
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isp->psy.properties = power_props;
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isp->psy.num_properties = ARRAY_SIZE(power_props);
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isp->psy.get_property = isp1704_charger_get_property;
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ret = power_supply_register(isp->dev, &isp->psy);
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if (ret)
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goto fail1;
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/*
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* REVISIT: using work in order to allow the usb notifications to be
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* made atomically in the future.
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*/
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INIT_WORK(&isp->work, isp1704_charger_work);
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isp->nb.notifier_call = isp1704_notifier_call;
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ret = usb_register_notifier(isp->phy, &isp->nb);
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if (ret)
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goto fail2;
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dev_info(isp->dev, "registered with product id %s\n", isp->model);
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/*
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* Taking over the D+ pullup.
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*
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* FIXME: The device will be disconnected if it was already
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* enumerated. The charger driver should be always loaded before any
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* gadget is loaded.
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*/
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if (isp->phy->otg->gadget)
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usb_gadget_disconnect(isp->phy->otg->gadget);
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/* Detect charger if VBUS is valid (the cable was already plugged). */
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ret = isp1704_read(isp, ULPI_USB_INT_STS);
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isp1704_charger_set_power(isp, 0);
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if ((ret & ULPI_INT_VBUS_VALID) && !isp->phy->otg->default_a) {
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isp->event = USB_EVENT_VBUS;
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schedule_work(&isp->work);
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}
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return 0;
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fail2:
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power_supply_unregister(&isp->psy);
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fail1:
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usb_put_transceiver(isp->phy);
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fail0:
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kfree(isp);
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dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
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isp1704_charger_set_power(isp, 0);
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return ret;
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}
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static int __devexit isp1704_charger_remove(struct platform_device *pdev)
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{
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struct isp1704_charger *isp = platform_get_drvdata(pdev);
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usb_unregister_notifier(isp->phy, &isp->nb);
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power_supply_unregister(&isp->psy);
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usb_put_transceiver(isp->phy);
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isp1704_charger_set_power(isp, 0);
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kfree(isp);
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return 0;
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}
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static struct platform_driver isp1704_charger_driver = {
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.driver = {
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.name = "isp1704_charger",
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},
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.probe = isp1704_charger_probe,
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.remove = __devexit_p(isp1704_charger_remove),
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};
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module_platform_driver(isp1704_charger_driver);
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MODULE_ALIAS("platform:isp1704_charger");
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MODULE_AUTHOR("Nokia Corporation");
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MODULE_DESCRIPTION("ISP170x USB Charger driver");
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MODULE_LICENSE("GPL");
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