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Message-Id: <20190225165822.2770-3-pawel.mikolaj.chmiel@gmail.com>
Date: Mon, 25 Feb 2019 17:58:22 +0100
From: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To: myungjoo.ham@...sung.com
Cc: cw00.choi@...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>,
Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Subject: [PATCH 2/2] extcon: Add fsa9480 extcon driver
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
+ 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 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;
+ 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,
+};
+
+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);
+ 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);
+
+ 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");
--
2.17.1
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