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Message-ID: <3709772.JujWszgv7K@acerlaptop>
Date: Wed, 20 Mar 2019 17:56:00 +0100
From: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To: Chanwoo Choi <cw00.choi@...sung.com>
Cc: myungjoo.ham@...sung.com, robh+dt@...nel.org, mark.rutland@....com,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Tomasz Figa <tomasz.figa@...il.com>,
Jonathan Bakker <xc-racer2@...e.ca>
Subject: Re: [PATCH 2/2] extcon: Add fsa9480 extcon driver
On poniedziałek, 18 marca 2019 11:47:38 CET Chanwoo Choi wrote:
> Hi,
>
> Sorry for late reply.
Thanks for review. I'll fix all issues and submit v2 version of patches.
>
> On 19. 2. 26. 오전 1:58, Paweł Chmiel wrote:
> > From: Tomasz Figa <tomasz.figa@...il.com>
> >
> > This patch adds extcon driver for Fairchild Semiconductor FSA9480
> > microUSB switch.
> >
> > Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
> > Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
> > Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
> > ---
> > drivers/extcon/Kconfig | 10 +
> > drivers/extcon/Makefile | 1 +
> > drivers/extcon/extcon-fsa9480.c | 473 ++++++++++++++++++++++++++++++++
> > 3 files changed, 484 insertions(+)
> > create mode 100644 drivers/extcon/extcon-fsa9480.c
> >
> > diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
> > index de15bf55895b..9904f993d39a 100644
> > --- a/drivers/extcon/Kconfig
> > +++ b/drivers/extcon/Kconfig
> > @@ -36,6 +36,16 @@ config EXTCON_AXP288
> > Say Y here to enable support for USB peripheral detection
> > and USB MUX switching by X-Power AXP288 PMIC.
> >
> > +config EXTCON_FSA9480
> > + tristate "FSA9480 EXTCON Support"
> > + depends on INPUT
>
> I add the comment about I2C interface. If you use the REGMAP_I2C,
> please add the proper dependency to prevent the build error.
>
> > + help
> > + If you say yes here you get support for the Fairchild Semiconductor
> > + FSA9480 microUSB switch and accessory detector chip. The FSA9480 is a USB
> > + port accessory detector and switch. The FSA9480 is fully controlled using
> > + I2C and enables USB data, stereo and mono audio, video, microphone
> > + and UART data to use a common connector port.
> > +
> > config EXTCON_GPIO
> > tristate "GPIO extcon support"
> > depends on GPIOLIB || COMPILE_TEST
> > diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
> > index 0888fdeded72..0a3a96d92a28 100644
> > --- a/drivers/extcon/Makefile
> > +++ b/drivers/extcon/Makefile
> > @@ -8,6 +8,7 @@ extcon-core-objs += extcon.o devres.o
> > obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
> > obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
> > obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
> > +obj-$(CONFIG_EXTCON_FSA9480) += extcon-fsa9480.o
> > obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o
> > obj-$(CONFIG_EXTCON_INTEL_INT3496) += extcon-intel-int3496.o
> > obj-$(CONFIG_EXTCON_INTEL_CHT_WC) += extcon-intel-cht-wc.o
> > diff --git a/drivers/extcon/extcon-fsa9480.c b/drivers/extcon/extcon-fsa9480.c
> > new file mode 100644
> > index 000000000000..5c58f3e3f0e4
> > --- /dev/null
> > +++ b/drivers/extcon/extcon-fsa9480.c
> > @@ -0,0 +1,473 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver
> > + *
> > + * Copyright (c) 2014 Tomasz Figa <tomasz.figa@...il.com>
> > + *
> > + * Loosely based on old fsa9480 misc-device driver.
> > + *
>
> This driver keep the 'SPDX' license rule. So, you don't need
> following license sentences. Please remove them.
>
> > + * 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.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/types.h>
> > +#include <linux/i2c.h>
> > +#include <linux/slab.h>
> > +#include <linux/bitops.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/err.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/kobject.h>
> > +#include <linux/extcon-provider.h>
> > +#include <linux/irqdomain.h>
> > +
> > +/* FSA9480 I2C registers */
> > +#define FSA9480_REG_DEVID 0x01
> > +#define FSA9480_REG_CTRL 0x02
> > +#define FSA9480_REG_INT1 0x03
> > +#define FSA9480_REG_INT2 0x04
> > +#define FSA9480_REG_INT1_MASK 0x05
> > +#define FSA9480_REG_INT2_MASK 0x06
> > +#define FSA9480_REG_ADC 0x07
> > +#define FSA9480_REG_TIMING1 0x08
> > +#define FSA9480_REG_TIMING2 0x09
> > +#define FSA9480_REG_DEV_T1 0x0a
> > +#define FSA9480_REG_DEV_T2 0x0b
> > +#define FSA9480_REG_BTN1 0x0c
> > +#define FSA9480_REG_BTN2 0x0d
> > +#define FSA9480_REG_CK 0x0e
> > +#define FSA9480_REG_CK_INT1 0x0f
> > +#define FSA9480_REG_CK_INT2 0x10
> > +#define FSA9480_REG_CK_INTMASK1 0x11
> > +#define FSA9480_REG_CK_INTMASK2 0x12
> > +#define FSA9480_REG_MANSW1 0x13
> > +#define FSA9480_REG_MANSW2 0x14
> > +
> > +/* Control */
> > +#define CON_SWITCH_OPEN (1 << 4)
> > +#define CON_RAW_DATA (1 << 3)
> > +#define CON_MANUAL_SW (1 << 2)
> > +#define CON_WAIT (1 << 1)
> > +#define CON_INT_MASK (1 << 0)
> > +#define CON_MASK (CON_SWITCH_OPEN | CON_RAW_DATA | \
> > + CON_MANUAL_SW | CON_WAIT)
> > +
> > +/* Device Type 1 */
> > +#define DEV_USB_OTG 7
> > +#define DEV_DEDICATED_CHG 6
> > +#define DEV_USB_CHG 5
> > +#define DEV_CAR_KIT 4
> > +#define DEV_UART 3
> > +#define DEV_USB 2
> > +#define DEV_AUDIO_2 1
> > +#define DEV_AUDIO_1 0
> > +
> > +#define DEV_T1_USB_MASK (DEV_USB_OTG | DEV_USB)
> > +#define DEV_T1_UART_MASK (DEV_UART)
> > +#define DEV_T1_CHARGER_MASK (DEV_DEDICATED_CHG | DEV_USB_CHG)
> > +
> > +/* Device Type 2 */
> > +#define DEV_AV 14
> > +#define DEV_TTY 13
> > +#define DEV_PPD 12
> > +#define DEV_JIG_UART_OFF 11
> > +#define DEV_JIG_UART_ON 10
> > +#define DEV_JIG_USB_OFF 9
> > +#define DEV_JIG_USB_ON 8
> > +
> > +#define DEV_T2_USB_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON)
> > +#define DEV_T2_UART_MASK (DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
> > +#define DEV_T2_JIG_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \
> > + DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
> > +
> > +/*
> > + * Manual Switch
> > + * D- [7:5] / D+ [4:2]
> > + * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO
> > + */
> > +#define SW_VAUDIO ((4 << 5) | (4 << 2))
> > +#define SW_UART ((3 << 5) | (3 << 2))
> > +#define SW_AUDIO ((2 << 5) | (2 << 2))
> > +#define SW_DHOST ((1 << 5) | (1 << 2))
> > +#define SW_AUTO ((0 << 5) | (0 << 2))
> > +
> > +/* Interrupt 1 */
> > +#define INT1_MASK (0xff << 0)
> > +#define INT_DETACH (1 << 1)
> > +#define INT_ATTACH (1 << 0)
> > +
> > +/* Interrupt 2 mask */
> > +#define INT2_MASK (0x1f << 0)
> > +
> > +/* Timing Set 1 */
> > +#define TIMING1_ADC_500MS (0x6 << 0)
> > +
> > +struct fsa9480_usbsw {
> > + struct i2c_client *client;
>
> Usually, many device drivers uses the REGMAP_I2C instead of
> using the i2c API directly. I recommend you use regmap interface.
>
>
> > + struct extcon_dev *edev;
> > + u16 dev;
> > + u16 mansw;
> > +};
> > +
> > +static const unsigned int fsa9480_extcon_cable[] = {
> > + EXTCON_USB_HOST,
> > + EXTCON_USB,
> > + EXTCON_CHG_USB_DCP,
> > + EXTCON_CHG_USB_SDP,
> > + EXTCON_CHG_USB_ACA,
> > + EXTCON_JACK_LINE_OUT,
> > + EXTCON_JACK_VIDEO_OUT,
> > + EXTCON_JIG,
> > +
> > + EXTCON_NONE,
> > +};
> > +
> > +static const u64 cable_types[] = {
> > + [DEV_USB_OTG] = BIT_ULL(EXTCON_USB_HOST),
> > + [DEV_DEDICATED_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_DCP),
> > + [DEV_USB_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),
> > + [DEV_CAR_KIT] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP)
> > + | BIT_ULL(EXTCON_JACK_LINE_OUT),
> > + [DEV_UART] = BIT_ULL(EXTCON_JIG),
> > + [DEV_USB] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),
> > + [DEV_AUDIO_2] = BIT_ULL(EXTCON_JACK_LINE_OUT),
> > + [DEV_AUDIO_1] = BIT_ULL(EXTCON_JACK_LINE_OUT),
> > + [DEV_AV] = BIT_ULL(EXTCON_JACK_LINE_OUT)
> > + | BIT_ULL(EXTCON_JACK_VIDEO_OUT),
> > + [DEV_TTY] = BIT_ULL(EXTCON_JIG),
> > + [DEV_PPD] = BIT_ULL(EXTCON_JACK_LINE_OUT) | BIT_ULL(EXTCON_CHG_USB_ACA),
> > + [DEV_JIG_UART_OFF] = BIT_ULL(EXTCON_JIG),
> > + [DEV_JIG_UART_ON] = BIT_ULL(EXTCON_JIG),
> > + [DEV_JIG_USB_OFF] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),
> > + [DEV_JIG_USB_ON] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),
> > +};
> > +
> > +static int fsa9480_write_reg(struct i2c_client *client, int reg, int value)
> > +{
> > + int ret;
> > +
> > + ret = i2c_smbus_write_byte_data(client, reg, value);
> > + if (ret < 0)
> > + dev_err(&client->dev, "%s: err %d\n", __func__, ret);
> > +
> > + return ret;
> > +}
> > +
> > +static int fsa9480_read_reg(struct i2c_client *client, int reg)
> > +{
> > + int ret;
> > +
> > + ret = i2c_smbus_read_byte_data(client, reg);
> > + if (ret < 0)
> > + dev_err(&client->dev, "%s: err %d\n", __func__, ret);
> > +
> > + return ret;
> > +}
> > +
> > +static int fsa9480_read_irq(struct i2c_client *client, int *value)
> > +{
> > + u8 regs[2];
> > + int ret;
> > +
> > + ret = i2c_smbus_read_i2c_block_data(client, FSA9480_REG_INT1, 2, regs);
> > + if (ret < 0)
> > + dev_err(&client->dev, "%s: err %d\n", __func__, ret);
> > +
> > + *value = regs[1] << 8 | regs[0];
> > + return ret;
> > +}
> > +
> > +static void fsa9480_set_switch(struct i2c_client *client, const char *buf)
> > +{
> > + struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
> > + unsigned int value;
> > + unsigned int path = 0;
> > +
> > + value = fsa9480_read_reg(client, FSA9480_REG_CTRL);
> > +
> > + if (!strncmp(buf, "VAUDIO", 6)) {
> > + path = SW_VAUDIO;
> > + value &= ~CON_MANUAL_SW;
> > + } else if (!strncmp(buf, "UART", 4)) {
> > + path = SW_UART;
> > + value &= ~CON_MANUAL_SW;
> > + } else if (!strncmp(buf, "AUDIO", 5)) {
> > + path = SW_AUDIO;
> > + value &= ~CON_MANUAL_SW;
> > + } else if (!strncmp(buf, "DHOST", 5)) {
> > + path = SW_DHOST;
> > + value &= ~CON_MANUAL_SW;
> > + } else if (!strncmp(buf, "AUTO", 4)) {
> > + path = SW_AUTO;
> > + value |= CON_MANUAL_SW;
> > + } else {
> > + dev_err(&client->dev, "Wrong command\n");
> > + return;
> > + }
> > +
> > + usbsw->mansw = path;
> > + fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);
> > + fsa9480_write_reg(client, FSA9480_REG_CTRL, value);
> > +}
> > +
> > +static ssize_t fsa9480_get_switch(struct i2c_client *client, char *buf)
> > +{
> > + unsigned int value;
> > +
> > + value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
> > +
> > + if (value == SW_VAUDIO)
> > + return sprintf(buf, "VAUDIO\n");
> > + else if (value == SW_UART)
> > + return sprintf(buf, "UART\n");
> > + else if (value == SW_AUDIO)
> > + return sprintf(buf, "AUDIO\n");
> > + else if (value == SW_DHOST)
> > + return sprintf(buf, "DHOST\n");
> > + else if (value == SW_AUTO)
> > + return sprintf(buf, "AUTO\n");
> > + else
> > + return sprintf(buf, "%x", value);
> > +}
> > +
> > +static ssize_t fsa9480_manualsw_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct i2c_client *client = to_i2c_client(dev);
> > +
> > + return fsa9480_get_switch(client, buf);
> > +
> > +}
> > +
> > +static ssize_t fsa9480_manualsw_set(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct i2c_client *client = to_i2c_client(dev);
> > +
> > + fsa9480_set_switch(client, buf);
> > +
> > + return count;
> > +}
> > +
> > +static DEVICE_ATTR(switch, 0644,
> > + fsa9480_manualsw_show, fsa9480_manualsw_set);
> > +
> > +static struct attribute *fsa9480_attributes[] = {
> > + &dev_attr_switch.attr,
> > + NULL
> > +};
> > +
> > +static const struct attribute_group fsa9480_group = {
> > + .attrs = fsa9480_attributes,
> > +};
>
> Unfortunately, we have to export the some attribute
> from linux framework. I think that it is not proper
> to add the specific sysfs entry for only one device driver.
>
> If you want to add the new sysfs entry, please contribue
> the extcon framework for all extcon device drivers.
>
> Please remove it.
>
> > +
> > +static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw,
> > + u16 mask, bool attached)
> > +{
> > + while (mask) {
> > + int dev = fls64(mask) - 1;
> > + u64 cables = cable_types[dev];
> > +
> > + while (cables) {
> > + int cable = fls64(cables) - 1;
> > +
> > + extcon_set_state_sync(usbsw->edev, cable, attached);
> > + cables &= ~BIT_ULL(cable);
> > + }
> > +
> > + mask &= ~BIT_ULL(dev);
> > + }
> > +}
> > +
> > +static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw)
> > +{
> > + struct i2c_client *client = usbsw->client;
> > + int val1, val2;
> > + u16 val;
> > +
> > + val1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
> > + val2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
> > + if (val1 < 0 || val2 < 0) {
> > + dev_err(&client->dev, "%s: failed to read registers", __func__);
> > + return;
> > + }
> > + val = val2 << 8 | val1;
> > +
> > + dev_info(&client->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2);
> > +
> > + if (usbsw->mansw && (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK))
> > + fsa9480_write_reg(client, FSA9480_REG_MANSW1, usbsw->mansw);
> > +
> > + /* handle detached cables first */
> > + fsa9480_handle_change(usbsw, usbsw->dev & ~val, false);
> > +
> > + /* then handle attached ones */
> > + fsa9480_handle_change(usbsw, val & ~usbsw->dev, true);
> > +
> > + usbsw->dev = val;
> > +}
> > +
> > +static irqreturn_t fsa9480_irq_handler(int irq, void *data)
> > +{
> > + struct fsa9480_usbsw *usbsw = data;
> > + struct i2c_client *client = usbsw->client;
> > + int intr = 0;
> > +
> > + /* clear interrupt */
> > + fsa9480_read_irq(client, &intr);
> > + if (!intr)
> > + return IRQ_NONE;
> > +
> > + /* device detection */
> > + fsa9480_detect_dev(usbsw);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int fsa9480_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
> > + struct fsa9480_usbsw *info;
> > + int ret;
> > +
> > + if (!client->irq) {
> > + dev_err(&client->dev, "no interrupt provided\n");
> > + return -EINVAL;
> > + }
> > +
> > + info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
> > + if (!info)
> > + return -ENOMEM;
> > + info->client = client;
> > +
> > + i2c_set_clientdata(client, info);
> > +
> > + /* External connector */
> > + info->edev = devm_extcon_dev_allocate(&client->dev,
> > + fsa9480_extcon_cable);
> > + if (IS_ERR(info->edev)) {
> > + dev_err(&client->dev, "failed to allocate memory for extcon\n");
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + ret = devm_extcon_dev_register(&client->dev, info->edev);
> > + if (ret) {
> > + dev_err(&client->dev, "failed to register extcon device\n");
> > + return ret;
> > + }
> > +
> > + /* ADC Detect Time: 500ms */
> > + fsa9480_write_reg(client, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);
> > +
> > + /* configure automatic switching */
> > + fsa9480_write_reg(client, FSA9480_REG_CTRL, CON_MASK);
> > +
> > + /* unmask interrupt (attach/detach only) */
> > + fsa9480_write_reg(client, FSA9480_REG_INT1_MASK,
> > + INT1_MASK & ~(INT_ATTACH | INT_DETACH));
> > + fsa9480_write_reg(client, FSA9480_REG_INT2_MASK, INT2_MASK);
> > +
> > + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
> > + fsa9480_irq_handler,
> > + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> > + "fsa9480", info);
> > + if (ret) {
> > + dev_err(&client->dev, "failed to request IRQ\n");
> > + return ret;
> > + }
> > +
> > + device_init_wakeup(&client->dev, true);
> > + fsa9480_detect_dev(info);
> > +
> > + ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);
>
> Please remove it.
>
> > + if (ret) {
> > + dev_err(&client->dev,
> > + "failed to create fsa9480 attribute group\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int fsa9480_remove(struct i2c_client *client)
> > +{
> > + sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
>
> Please remove it.
>
> > +
> > + return 0;
> > +}
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int fsa9480_suspend(struct device *dev)
> > +{
> > + struct i2c_client *client = to_i2c_client(dev);
> > +
> > + if (device_may_wakeup(&client->dev) && client->irq)
> > + enable_irq_wake(client->irq);
> > +
> > + return 0;
> > +}
> > +
> > +static int fsa9480_resume(struct device *dev)
> > +{
> > + struct i2c_client *client = to_i2c_client(dev);
> > +
> > + if (device_may_wakeup(&client->dev) && client->irq)
> > + disable_irq_wake(client->irq);
> > +
> > + return 0;
> > +}
> > +#endif
> > +
> > +static const struct dev_pm_ops fsa9480_pm_ops = {
> > + SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)
> > +};
> > +
> > +static const struct i2c_device_id fsa9480_id[] = {
> > + { "fsa9480", 0 },
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(i2c, fsa9480_id);
> > +
> > +static const struct of_device_id fsa9480_of_match[] = {
> > + { .compatible = "fcs,fsa9480", },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, fsa9480_of_match);
> > +
> > +static struct i2c_driver fsa9480_i2c_driver = {
> > + .driver = {
> > + .name = "fsa9480",
> > + .pm = &fsa9480_pm_ops,
> > + .of_match_table = fsa9480_of_match,
> > + },
> > + .probe = fsa9480_probe,
> > + .remove = fsa9480_remove,
> > + .id_table = fsa9480_id,
> > +};
> > +
> > +static int __init fsa9480_module_init(void)
> > +{
> > + return i2c_add_driver(&fsa9480_i2c_driver);
> > +}
> > +subsys_initcall(fsa9480_module_init);
> > +
> > +static void __exit fsa9480_module_exit(void)
> > +{
> > + i2c_del_driver(&fsa9480_i2c_driver);
> > +}
> > +module_exit(fsa9480_module_exit);
> > +
> > +MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");
> > +MODULE_AUTHOR("Tomasz Figa <tomasz.figa@...il.com>");
> > +MODULE_LICENSE("GPL");
> >
>
>
>
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