cregit-Linux how code gets into the kernel

Release 4.11 drivers/power/supply/isp1704_charger.c

/*
 * ISP1704 USB Charger Detection driver
 *
 * Copyright (C) 2010 Nokia Corporation
 * Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_gpio.h>

#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/power/isp1704_charger.h>

/* Vendor specific Power Control register */

#define ISP1704_PWR_CTRL		0x3d

#define ISP1704_PWR_CTRL_SWCTRL		(1 << 0)

#define ISP1704_PWR_CTRL_DET_COMP	(1 << 1)

#define ISP1704_PWR_CTRL_BVALID_RISE	(1 << 2)

#define ISP1704_PWR_CTRL_BVALID_FALL	(1 << 3)

#define ISP1704_PWR_CTRL_DP_WKPU_EN	(1 << 4)

#define ISP1704_PWR_CTRL_VDAT_DET	(1 << 5)

#define ISP1704_PWR_CTRL_DPVSRC_EN	(1 << 6)

#define ISP1704_PWR_CTRL_HWDETECT	(1 << 7)


#define NXP_VENDOR_ID			0x04cc


static u16 isp170x_id[] = {
	0x1704,
	0x1707,
};


struct isp1704_charger {
	
struct device			*dev;
	
struct power_supply		*psy;
	
struct power_supply_desc	psy_desc;
	
struct usb_phy			*phy;
	
struct notifier_block		nb;
	
struct work_struct		work;

	/* properties */
	
char			model[8];
	
unsigned		present:1;
	
unsigned		online:1;
	
unsigned		current_max;
};


static inline int isp1704_read(struct isp1704_charger *isp, u32 reg) { return usb_phy_io_read(isp->phy, reg); }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus25100.00%1100.00%
Total25100.00%1100.00%


static inline int isp1704_write(struct isp1704_charger *isp, u32 reg, u32 val) { return usb_phy_io_write(isp->phy, val, reg); }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus2893.33%150.00%
Ivaylo Dimitrov26.67%150.00%
Total30100.00%2100.00%

/* * Disable/enable the power from the isp1704 if a function for it * has been provided with platform data. */
static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on) { struct isp1704_charger_data *board = isp->dev->platform_data; if (board && board->set_power) board->set_power(on); else if (board) gpio_set_value(board->enable_gpio, on); }

Contributors

PersonTokensPropCommitsCommitProp
Kalle Jokiniemi3870.37%133.33%
Sebastian Reichel1425.93%133.33%
Felipe Contreras23.70%133.33%
Total54100.00%3100.00%

/* * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB * chargers). * * REVISIT: The method is defined in Battery Charging Specification and is * applicable to any ULPI transceiver. Nothing isp170x specific here. */
static inline int isp1704_charger_type(struct isp1704_charger *isp) { u8 reg; u8 func_ctrl; u8 otg_ctrl; int type = POWER_SUPPLY_TYPE_USB_DCP; func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL); otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL); /* disable pulldowns */ reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN; isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg); /* full speed */ isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL), ULPI_FUNC_CTRL_XCVRSEL_MASK); isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), ULPI_FUNC_CTRL_FULL_SPEED); /* Enable strong pull-up on DP (1.5K) and reset */ reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET; isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg); usleep_range(1000, 2000); reg = isp1704_read(isp, ULPI_DEBUG); if ((reg & 3) != 3) type = POWER_SUPPLY_TYPE_USB_CDP; /* recover original state */ isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl); isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl); return type; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus159100.00%2100.00%
Total159100.00%2100.00%

/* * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger * is actually a dedicated charger, the following steps need to be taken. */
static inline int isp1704_charger_verify(struct isp1704_charger *isp) { int ret = 0; u8 r; /* Reset the transceiver */ r = isp1704_read(isp, ULPI_FUNC_CTRL); r |= ULPI_FUNC_CTRL_RESET; isp1704_write(isp, ULPI_FUNC_CTRL, r); usleep_range(1000, 2000); /* Set normal mode */ r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK); isp1704_write(isp, ULPI_FUNC_CTRL, r); /* Clear the DP and DM pull-down bits */ r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN; isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r); /* Enable strong pull-up on DP (1.5K) and reset */ r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET; isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r); usleep_range(1000, 2000); /* Read the line state */ if (!isp1704_read(isp, ULPI_DEBUG)) { /* Disable strong pull-up on DP (1.5K) */ isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL), ULPI_FUNC_CTRL_TERMSELECT); return 1; } /* Is it a charger or PS/2 connection */ /* Enable weak pull-up resistor on DP */ isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL), ISP1704_PWR_CTRL_DP_WKPU_EN); /* Disable strong pull-up on DP (1.5K) */ isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL), ULPI_FUNC_CTRL_TERMSELECT); /* Enable weak pull-down resistor on DM */ isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL), ULPI_OTG_CTRL_DM_PULLDOWN); /* It's a charger if the line states are clear */ if (!(isp1704_read(isp, ULPI_DEBUG))) ret = 1; /* Disable weak pull-up resistor on DP */ isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL), ISP1704_PWR_CTRL_DP_WKPU_EN); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus216100.00%2100.00%
Total216100.00%2100.00%


static inline int isp1704_charger_detect(struct isp1704_charger *isp) { unsigned long timeout; u8 pwr_ctrl; int ret = 0; pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL); /* set SW control bit in PWR_CTRL register */ isp1704_write(isp, ISP1704_PWR_CTRL, ISP1704_PWR_CTRL_SWCTRL); /* enable manual charger detection */ isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL), ISP1704_PWR_CTRL_SWCTRL | ISP1704_PWR_CTRL_DPVSRC_EN); usleep_range(1000, 2000); timeout = jiffies + msecs_to_jiffies(300); do { /* Check if there is a charger */ if (isp1704_read(isp, ISP1704_PWR_CTRL) & ISP1704_PWR_CTRL_VDAT_DET) { ret = isp1704_charger_verify(isp); break; } } while (!time_after(jiffies, timeout) && isp->online); /* recover original state */ isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus127100.00%3100.00%
Total127100.00%3100.00%


static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp) { if (isp1704_charger_detect(isp) && isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP) return true; else return false; }

Contributors

PersonTokensPropCommitsCommitProp
Pali Rohár33100.00%1100.00%
Total33100.00%1100.00%


static void isp1704_charger_work(struct work_struct *data) { struct isp1704_charger *isp = container_of(data, struct isp1704_charger, work); static DEFINE_MUTEX(lock); mutex_lock(&lock); switch (isp->phy->last_event) { case USB_EVENT_VBUS: /* do not call wall charger detection more times */ if (!isp->present) { isp->online = true; isp->present = 1; isp1704_charger_set_power(isp, 1); /* detect wall charger */ if (isp1704_charger_detect_dcp(isp)) { isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_DCP; isp->current_max = 1800; } else { isp->psy_desc.type = POWER_SUPPLY_TYPE_USB; isp->current_max = 500; } /* enable data pullups */ if (isp->phy->otg->gadget) usb_gadget_connect(isp->phy->otg->gadget); } if (isp->psy_desc.type != POWER_SUPPLY_TYPE_USB_DCP) { /* * Only 500mA here or high speed chirp * handshaking may break */ if (isp->current_max > 500) isp->current_max = 500; if (isp->current_max > 100) isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_CDP; } break; case USB_EVENT_NONE: isp->online = false; isp->present = 0; isp->current_max = 0; isp->psy_desc.type = POWER_SUPPLY_TYPE_USB; /* * Disable data pullups. We need to prevent the controller from * enumerating. * * FIXME: This is here to allow charger detection with Host/HUB * chargers. The pullups may be enabled elsewhere, so this can * not be the final solution. */ if (isp->phy->otg->gadget) usb_gadget_disconnect(isp->phy->otg->gadget); isp1704_charger_set_power(isp, 0); break; default: goto out; } power_supply_changed(isp->psy); out: mutex_unlock(&lock); }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus17566.04%457.14%
Pali Rohár7829.43%114.29%
Kalle Jokiniemi72.64%114.29%
Krzysztof Kozlowski51.89%114.29%
Total265100.00%7100.00%


static int isp1704_notifier_call(struct notifier_block *nb, unsigned long val, void *v) { struct isp1704_charger *isp = container_of(nb, struct isp1704_charger, nb); schedule_work(&isp->work); return NOTIFY_OK; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus4395.56%266.67%
Pali Rohár24.44%133.33%
Total45100.00%3100.00%


static int isp1704_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct isp1704_charger *isp = power_supply_get_drvdata(psy); switch (psp) { case POWER_SUPPLY_PROP_PRESENT: val->intval = isp->present; break; case POWER_SUPPLY_PROP_ONLINE: val->intval = isp->online; break; case POWER_SUPPLY_PROP_CURRENT_MAX: val->intval = isp->current_max; break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = isp->model; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = "NXP"; break; default: return -EINVAL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus10199.02%266.67%
Krzysztof Kozlowski10.98%133.33%
Total102100.00%3100.00%

static enum power_supply_property power_props[] = { POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_CURRENT_MAX, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, };
static inline int isp1704_test_ulpi(struct isp1704_charger *isp) { int vendor; int product; int i; int ret = -ENODEV; /* Test ULPI interface */ ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa); if (ret < 0) return ret; ret = isp1704_read(isp, ULPI_SCRATCH); if (ret < 0) return ret; if (ret != 0xaa) return -ENODEV; /* Verify the product and vendor id matches */ vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW); vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8; if (vendor != NXP_VENDOR_ID) return -ENODEV; product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW); product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8; for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) { if (product == isp170x_id[i]) { sprintf(isp->model, "isp%x", product); return product; } } dev_err(isp->dev, "product id %x not matching known ids", product); return -ENODEV; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus185100.00%2100.00%
Total185100.00%2100.00%


static int isp1704_charger_probe(struct platform_device *pdev) { struct isp1704_charger *isp; int ret = -ENODEV; struct power_supply_config psy_cfg = {}; struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev); struct device_node *np = pdev->dev.of_node; if (np) { int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0); if (gpio < 0) { dev_err(&pdev->dev, "missing DT GPIO nxp,enable-gpio\n"); return gpio; } pdata = devm_kzalloc(&pdev->dev, sizeof(struct isp1704_charger_data), GFP_KERNEL); pdata->enable_gpio = gpio; dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio); ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio, GPIOF_OUT_INIT_HIGH, "isp1704_reset"); if (ret) { dev_err(&pdev->dev, "gpio request failed\n"); goto fail0; } } if (!pdata) { dev_err(&pdev->dev, "missing platform data!\n"); return -ENODEV; } isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL); if (!isp) return -ENOMEM; if (np) isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0); else isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); if (IS_ERR(isp->phy)) { ret = PTR_ERR(isp->phy); dev_err(&pdev->dev, "usb_get_phy failed\n"); goto fail0; } isp->dev = &pdev->dev; platform_set_drvdata(pdev, isp); isp1704_charger_set_power(isp, 1); ret = isp1704_test_ulpi(isp); if (ret < 0) { dev_err(&pdev->dev, "isp1704_test_ulpi failed\n"); goto fail1; } isp->psy_desc.name = "isp1704"; isp->psy_desc.type = POWER_SUPPLY_TYPE_USB; isp->psy_desc.properties = power_props; isp->psy_desc.num_properties = ARRAY_SIZE(power_props); isp->psy_desc.get_property = isp1704_charger_get_property; psy_cfg.drv_data = isp; isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg); if (IS_ERR(isp->psy)) { ret = PTR_ERR(isp->psy); dev_err(&pdev->dev, "power_supply_register failed\n"); goto fail1; } /* * REVISIT: using work in order to allow the usb notifications to be * made atomically in the future. */ INIT_WORK(&isp->work, isp1704_charger_work); isp->nb.notifier_call = isp1704_notifier_call; ret = usb_register_notifier(isp->phy, &isp->nb); if (ret) { dev_err(&pdev->dev, "usb_register_notifier failed\n"); goto fail2; } dev_info(isp->dev, "registered with product id %s\n", isp->model); /* * Taking over the D+ pullup. * * FIXME: The device will be disconnected if it was already * enumerated. The charger driver should be always loaded before any * gadget is loaded. */ if (isp->phy->otg->gadget) usb_gadget_disconnect(isp->phy->otg->gadget); if (isp->phy->last_event == USB_EVENT_NONE) isp1704_charger_set_power(isp, 0); /* Detect charger if VBUS is valid (the cable was already plugged). */ if (isp->phy->last_event == USB_EVENT_VBUS && !isp->phy->otg->default_a) schedule_work(&isp->work); return 0; fail2: power_supply_unregister(isp->psy); fail1: isp1704_charger_set_power(isp, 0); fail0: dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus26543.87%533.33%
Sebastian Reichel17829.47%16.67%
Pali Rohár8514.07%213.33%
Krzysztof Kozlowski416.79%213.33%
Kalle Jokiniemi142.32%16.67%
Jingoo Han91.49%16.67%
Dan Carpenter71.16%16.67%
Kishon Vijay Abraham I50.83%213.33%
Total604100.00%15100.00%


static int isp1704_charger_remove(struct platform_device *pdev) { struct isp1704_charger *isp = platform_get_drvdata(pdev); usb_unregister_notifier(isp->phy, &isp->nb); power_supply_unregister(isp->psy); isp1704_charger_set_power(isp, 0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus4386.00%266.67%
Kalle Jokiniemi714.00%133.33%
Total50100.00%3100.00%

#ifdef CONFIG_OF static const struct of_device_id omap_isp1704_of_match[] = { { .compatible = "nxp,isp1704", }, { .compatible = "nxp,isp1707", }, {}, }; MODULE_DEVICE_TABLE(of, omap_isp1704_of_match); #endif static struct platform_driver isp1704_charger_driver = { .driver = { .name = "isp1704_charger", .of_match_table = of_match_ptr(omap_isp1704_of_match), }, .probe = isp1704_charger_probe, .remove = isp1704_charger_remove, }; module_platform_driver(isp1704_charger_driver); MODULE_ALIAS("platform:isp1704_charger"); MODULE_AUTHOR("Nokia Corporation"); MODULE_DESCRIPTION("ISP170x USB Charger driver"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Heikki Krogerus157872.75%731.82%
Sebastian Reichel23610.88%14.55%
Pali Rohár2069.50%313.64%
Kalle Jokiniemi703.23%14.55%
Krzysztof Kozlowski522.40%29.09%
Jingoo Han90.41%14.55%
Dan Carpenter70.32%14.55%
Kishon Vijay Abraham I50.23%29.09%
Felipe Contreras20.09%14.55%
Ivaylo Dimitrov20.09%14.55%
Axel Lin10.05%14.55%
Ameya Palande10.05%14.55%
Total2169100.00%22100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.