[PATCH v1 1/1] misc: extcon: add MAX14526 MUIC support
Svyatoslav Ryhel
clamor95 at gmail.com
Wed Apr 19 20:52:48 CEST 2023
MAX14526 is a powerful extcon chip which allows detection of various
plugs like usb, mhl, uart, headset etc. This version of driver
implements support of AP-usb and CP-usb/uart paths.
Tested-by: Andreas Westman Dorcsak <hedmoo at yahoo.com> # LG P880 T30
Tested-by: Svyatoslav Ryhel <clamor95 at gmail.com> # LG P895 T30
Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
drivers/misc/Kconfig | 2 +
drivers/misc/Makefile | 1 +
drivers/misc/extcon/Kconfig | 8 ++
drivers/misc/extcon/Makefile | 2 +
drivers/misc/extcon/extcon-max14526.c | 153 ++++++++++++++++++++++++++
5 files changed, 166 insertions(+)
create mode 100644 drivers/misc/extcon/Kconfig
create mode 100644 drivers/misc/extcon/Makefile
create mode 100644 drivers/misc/extcon/extcon-max14526.c
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 4e1ae03e9f..1b49f3cf72 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -659,4 +659,6 @@ config SL28CPLD
the base driver which provides common access methods for the
sub-drivers.
+source "drivers/misc/extcon/Kconfig"
+
endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 3b792f2a14..6d4fc8ddf9 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -87,3 +87,4 @@ obj-$(CONFIG_K3_AVS0) += k3_avs.o
obj-$(CONFIG_ESM_K3) += k3_esm.o
obj-$(CONFIG_ESM_PMIC) += esm_pmic.o
obj-$(CONFIG_SL28CPLD) += sl28cpld.o
+obj-y += extcon/
diff --git a/drivers/misc/extcon/Kconfig b/drivers/misc/extcon/Kconfig
new file mode 100644
index 0000000000..99c38224f3
--- /dev/null
+++ b/drivers/misc/extcon/Kconfig
@@ -0,0 +1,8 @@
+config EXTCON_MAX14526
+ bool "Maxim MAX14526 EXTCON Support"
+ select DM_I2C
+ select DM_MISC
+ help
+ If you say yes here you get support for the MUIC device of
+ Maxim MAX14526. The MAX14526 MUIC is a USB port accessory
+ detector and switch.
diff --git a/drivers/misc/extcon/Makefile b/drivers/misc/extcon/Makefile
new file mode 100644
index 0000000000..f012b688ce
--- /dev/null
+++ b/drivers/misc/extcon/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0+
+obj-$(CONFIG_EXTCON_MAX14526) += extcon-max14526.o
diff --git a/drivers/misc/extcon/extcon-max14526.c b/drivers/misc/extcon/extcon-max14526.c
new file mode 100644
index 0000000000..c8505dae49
--- /dev/null
+++ b/drivers/misc/extcon/extcon-max14526.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Svyatoslav Ryhel <clamor95 at gmail.com>
+ *
+ * U-boot lacks extcon DM.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <log.h>
+#include <misc.h>
+#include <asm/gpio.h>
+
+#define CONTROL_1 0x01
+#define SW_CONTROL 0x03
+
+#define ID_200 0x10
+#define ADC_EN 0x02
+#define CP_EN 0x01
+
+#define DP_USB 0x00
+#define DP_UART 0x08
+#define DP_AUDIO 0x10
+#define DP_OPEN 0x38
+
+#define DM_USB 0x00
+#define DM_UART 0x01
+#define DM_AUDIO 0x02
+#define DM_OPEN 0x07
+
+#define AP_USB BIT(0)
+#define CP_USB BIT(1)
+#define CP_UART BIT(2)
+
+struct max14526_priv {
+ struct gpio_desc usif_gpio;
+ struct gpio_desc dp2t_gpio;
+ struct gpio_desc ifx_usb_vbus_gpio;
+};
+
+static void max14526_set_mode(struct udevice *dev, int mode)
+{
+ struct max14526_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ if ((mode & AP_USB) || (mode & CP_USB)) {
+ /* Connect CP UART signals to AP */
+ ret = dm_gpio_set_value(&priv->usif_gpio, 0);
+ if (ret)
+ printf("%s: error changing usif-gpio (%d)\n", __func__, ret);
+ }
+
+ if (mode & CP_UART) {
+ /* Connect CP UART signals to DP2T */
+ ret = dm_gpio_set_value(&priv->usif_gpio, 1);
+ if (ret)
+ printf("%s: error changing usif-gpio (%d)\n", __func__, ret);
+ }
+
+ if (mode & CP_USB) {
+ /* Connect CP USB to MUIC UART */
+ ret = dm_gpio_set_value(&priv->ifx_usb_vbus_gpio, 1);
+ if (ret)
+ printf("%s: error changing usb-vbus-gpio (%d)\n", __func__, ret);
+
+ ret = dm_gpio_set_value(&priv->dp2t_gpio, 1);
+ if (ret)
+ printf("%s: error changing dp2t-gpio (%d)\n", __func__, ret);
+ }
+
+ if ((mode & AP_USB) || (mode & CP_UART)) {
+ /* Connect CP UART to MUIC UART */
+ ret = dm_gpio_set_value(&priv->dp2t_gpio, 0);
+ if (ret)
+ printf("%s: error changing dp2t-gpio (%d)\n", __func__, ret);
+ }
+
+ if (mode & AP_USB) {
+ /* Enables USB Path */
+ ret = dm_i2c_reg_write(dev, SW_CONTROL, DP_USB | DM_USB);
+ if (ret)
+ printf("USB Path set failed: %d\n", ret);
+ }
+
+ if ((mode & CP_USB) || (mode & CP_UART)) {
+ /* Enables UART Path */
+ ret = dm_i2c_reg_write(dev, SW_CONTROL, DP_UART | DM_UART);
+ if (ret)
+ printf("USB Path set failed: %d\n", ret);
+ }
+
+ /* Enables 200K, Charger Pump, and ADC */
+ ret = dm_i2c_reg_write(dev, CONTROL_1, ID_200 | ADC_EN | CP_EN);
+ if (ret)
+ printf("200K, Charger Pump, and ADC set failed: %d\n", ret);
+}
+
+static int max14526_probe(struct udevice *dev)
+{
+ struct max14526_priv *priv = dev_get_priv(dev);
+ int ret, mode = 0;
+
+ ret = gpio_request_by_name(dev, "usif-gpios", 0,
+ &priv->usif_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ printf("%s: Could not decode usif-gpios (%d)\n", __func__, ret);
+ return ret;
+ }
+
+ ret = gpio_request_by_name(dev, "dp2t-gpios", 0,
+ &priv->dp2t_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ printf("%s: Could not decode dp2t-gpios (%d)\n", __func__, ret);
+ return ret;
+ }
+
+ if (dev_read_bool(dev, "maxim,ap-usb"))
+ mode |= AP_USB;
+
+ if (dev_read_bool(dev, "maxim,cp-usb")) {
+ mode |= CP_USB;
+
+ ret = gpio_request_by_name(dev, "usb-vbus-gpios", 0,
+ &priv->ifx_usb_vbus_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ printf("%s: Could not decode usb-vbus-gpios (%d)\n", __func__, ret);
+ return ret;
+ }
+ }
+
+ if (dev_read_bool(dev, "maxim,cp-uart"))
+ mode |= CP_UART;
+
+ max14526_set_mode(dev, mode);
+
+ return 0;
+}
+
+static const struct udevice_id max14526_ids[] = {
+ { .compatible = "maxim,max14526-muic" },
+ { }
+};
+
+U_BOOT_DRIVER(extcon_max14526) = {
+ .name = "extcon_max14526",
+ .id = UCLASS_MISC,
+ .of_match = max14526_ids,
+ .probe = max14526_probe,
+ .priv_auto = sizeof(struct max14526_priv),
+};
--
2.37.2
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