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514 lines
13 KiB
514 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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* Copyright (C) 2012 - 2013 Pali Rohár <[email protected]> |
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*/ |
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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/of.h> |
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#include <linux/gpio/consumer.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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|
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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 power_supply_desc psy_desc; |
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struct gpio_desc *enable_gpio; |
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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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|
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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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}; |
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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 reg, u32 val) |
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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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static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on) |
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{ |
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gpiod_set_value(isp->enable_gpio, on); |
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} |
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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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|
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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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|
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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 inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp) |
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{ |
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if (isp1704_charger_detect(isp) && |
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isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP) |
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return true; |
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else |
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return false; |
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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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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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mutex_lock(&lock); |
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switch (isp->phy->last_event) { |
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case USB_EVENT_VBUS: |
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/* do not call wall charger detection more times */ |
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if (!isp->present) { |
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isp->online = true; |
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isp->present = 1; |
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isp1704_charger_set_power(isp, 1); |
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/* detect wall charger */ |
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if (isp1704_charger_detect_dcp(isp)) { |
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isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_DCP; |
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isp->current_max = 1800; |
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} else { |
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isp->psy_desc.type = POWER_SUPPLY_TYPE_USB; |
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isp->current_max = 500; |
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} |
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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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if (isp->psy_desc.type != POWER_SUPPLY_TYPE_USB_DCP) { |
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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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if (isp->current_max > 500) |
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isp->current_max = 500; |
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if (isp->current_max > 100) |
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isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_CDP; |
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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->present = 0; |
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isp->current_max = 0; |
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isp->psy_desc.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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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 val, void *v) |
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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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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 = power_supply_get_drvdata(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; |
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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 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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struct power_supply_config psy_cfg = {}; |
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isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL); |
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if (!isp) |
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return -ENOMEM; |
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isp->enable_gpio = devm_gpiod_get(&pdev->dev, "nxp,enable", |
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GPIOD_OUT_HIGH); |
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if (IS_ERR(isp->enable_gpio)) { |
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ret = PTR_ERR(isp->enable_gpio); |
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dev_err(&pdev->dev, "Could not get reset gpio: %d\n", ret); |
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return ret; |
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} |
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if (pdev->dev.of_node) |
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isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0); |
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else |
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isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); |
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if (IS_ERR(isp->phy)) { |
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ret = PTR_ERR(isp->phy); |
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dev_err(&pdev->dev, "usb_get_phy failed\n"); |
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goto fail0; |
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} |
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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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dev_err(&pdev->dev, "isp1704_test_ulpi failed\n"); |
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goto fail1; |
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} |
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isp->psy_desc.name = "isp1704"; |
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isp->psy_desc.type = POWER_SUPPLY_TYPE_USB; |
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isp->psy_desc.properties = power_props; |
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isp->psy_desc.num_properties = ARRAY_SIZE(power_props); |
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isp->psy_desc.get_property = isp1704_charger_get_property; |
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psy_cfg.drv_data = isp; |
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isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg); |
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if (IS_ERR(isp->psy)) { |
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ret = PTR_ERR(isp->psy); |
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dev_err(&pdev->dev, "power_supply_register failed\n"); |
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goto fail1; |
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} |
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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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dev_err(&pdev->dev, "usb_register_notifier failed\n"); |
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goto fail2; |
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} |
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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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|
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if (isp->phy->last_event == USB_EVENT_NONE) |
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isp1704_charger_set_power(isp, 0); |
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/* Detect charger if VBUS is valid (the cable was already plugged). */ |
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if (isp->phy->last_event == USB_EVENT_VBUS && |
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!isp->phy->otg->default_a) |
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schedule_work(&isp->work); |
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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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isp1704_charger_set_power(isp, 0); |
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fail0: |
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dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret); |
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return ret; |
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} |
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static int 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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isp1704_charger_set_power(isp, 0); |
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return 0; |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id omap_isp1704_of_match[] = { |
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{ .compatible = "nxp,isp1704", }, |
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{ .compatible = "nxp,isp1707", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, omap_isp1704_of_match); |
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#endif |
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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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.of_match_table = of_match_ptr(omap_isp1704_of_match), |
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}, |
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.probe = isp1704_charger_probe, |
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.remove = 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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