From patchwork Mon Mar 15 10:56:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pho Tran X-Patchwork-Id: 12138921 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8754C433E0 for ; Mon, 15 Mar 2021 10:57:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B83864E21 for ; Mon, 15 Mar 2021 10:57:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229970AbhCOK4q (ORCPT ); Mon, 15 Mar 2021 06:56:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229961AbhCOK4o (ORCPT ); Mon, 15 Mar 2021 06:56:44 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDDEEC061574; Mon, 15 Mar 2021 03:56:43 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id s21so8572228pjq.1; Mon, 15 Mar 2021 03:56:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=UjEoP/mOGO2TvXZO1+pbAIUlCN14kUHKOmr01cOJo0k=; b=YAVQtiYke8i5GwXu58UXmv9tu/8/R5IvlKP5yNCPbWOs370fpG/jUzNSeEim5OkzHv RNyzVAOubudXd+S5Tnh2yeh7hIeIDqkltpPRQ0oNqUkNVTHOMfHx3ETY5PIGl69zDZhE huUnoVaktBmEhy0sXCR8QT9v7afXcxUit7ql1bIMRvLp2vlLVHh4wCT6TTLqv3Me2CFm JpnDQrgzlDewyS3an8pT5xIDF/WzAEwZ9miEtu/w3zKslWG5BHNLgiymFJxOUqIGr7EZ A1NR9wHxfWHH2/eKyzati7FlqFwpOhS9K26PJKg4/LLTJbSb5KaQ1zB5icYnWpoQAM2T 59pw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=UjEoP/mOGO2TvXZO1+pbAIUlCN14kUHKOmr01cOJo0k=; b=jmTKqy6ZyeBlluSKEf0C1FIUGzmS4DCaUtn7Yd02K0Ee3XHu+DBpppyS9nIRCYaOKm yEj6MhwbkN/Qhv2XT2hzsWBixTcKfFopcDv8hHtP8WKGe9LOkzOpB5dXZFroZ0fNVQH9 Uh36IATl5f7kKly4+0Xism4LAtU9X+sN5qUQo4q0IVw7iNgHELG8N1hDwKLpAaSqchDi J78aebDyvZzVANmZehyteZ87WA4/2oisJ008ymCKf8X4ZDDctlv6K0MrPGhSUszO2ObY 5SqgFwoa6rooGb+7S9tIClXDBR0aF/Z9GxzL1sG9u8W63EQ+4T5TQDmWtvFIdPrs898W 8yOA== X-Gm-Message-State: AOAM530hJkgTALqAumc2FLjxLkZrzQtlhQz9SrlXKXY8MCwxJuO6iukY 8zZjAXlwHXLNRJndsqMbi2A= X-Google-Smtp-Source: ABdhPJyAf5vVF+dQC6dADL7niodzTd+Kj6URHTfV0w7JOwPsM5VqfYyRxurpPfms/wZO35FpUX1zoQ== X-Received: by 2002:a17:902:8306:b029:e6:125c:1a3a with SMTP id bd6-20020a1709028306b02900e6125c1a3amr11518844plb.65.1615805803446; Mon, 15 Mar 2021 03:56:43 -0700 (PDT) Received: from localhost.localdomain ([27.67.188.119]) by smtp.gmail.com with ESMTPSA id bj15sm10449724pjb.9.2021.03.15.03.56.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Mar 2021 03:56:42 -0700 (PDT) From: Pho Tran To: johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Hung.Nguyen@silabs.com, Pho Tran Subject: [PATCH v5] USB: serial: cp210x: Make the CP210x driver work with GPIOs of CP2108 Date: Mon, 15 Mar 2021 17:56:26 +0700 Message-Id: <20210315105626.2510-1-photranvan0712@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Pho Tran Similar to other CP210x devices, GPIO interfaces (gpiochip) should be supported for CP2108. CP2108 has 4 serial interfaces but only 1 set of GPIO pins are shared to all of those interfaces. So, just need to initialize GPIOs of CP2108 with only one interface (I use interface 0). It means just only 1 gpiochip device file will be created for CP2108. CP2108 has 16 GPIOs, So data types of several variables need to be is u16 instead of u8(in struct cp210x_serial_private). This doesn't affect other CP210x devices. Because CP2108 has 16 GPIO pins, the parameter passed by cp210x functions will be different from other CP210x devices. So need to check part number of the device to use correct data format before sending commands to devices. Like CP2104, CP2108 have GPIO pins with configurable options. Therefore, should be mask all pins which are not in GPIO mode in cp2108_gpio_init() function. Signed-off-by: Pho Tran --- 03/12/2022: Patch v4 used git send-mail instead of send patch by manual follow the instructions of Johan Hovold . 03/05/2021: Patch v3 modified format and contents of changelog follow feedback from Johan Hovold . 03/04/2021: Patch v2 modified format patch as comment from Johan Hovold : 1. Break commit message lines at 80 cols 2. Use kernel u8 and u16 instead of the c99 ones. 03/01/2021: Initialed submission of patch "Make the CP210x driver work with GPIOs of CP2108.". drivers/usb/serial/cp210x.c | 199 +++++++++++++++++++++++++++++++----- 1 file changed, 172 insertions(+), 27 deletions(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 7bec1e730b20..0e92e41bacc5 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -245,9 +245,9 @@ struct cp210x_serial_private { #ifdef CONFIG_GPIOLIB struct gpio_chip gc; bool gpio_registered; - u8 gpio_pushpull; - u8 gpio_altfunc; - u8 gpio_input; + u16 gpio_pushpull; + u16 gpio_altfunc; + u16 gpio_input; #endif u8 partnum; speed_t min_speed; @@ -500,6 +500,25 @@ struct cp210x_single_port_config { u8 device_cfg; } __packed; +/* + * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes + * on a CP2108 chip. Structure needs padding due to unused/unspecified bytes. + */ +struct cp210x_quad_port_state { + __le16 Mode_PB[5]; + __le16 LowPower_PB[5]; + __le16 Latch_PB[5]; +} __packed; + +struct cp210x_quad_port_config { + struct cp210x_quad_port_state reset_state; + struct cp210x_quad_port_state suspend_state; + u8 IPDelay_IFC[4]; + u8 EnhancedFxn_IFC[4]; + u8 EnhancedFxn_Device; + u8 ExtClkFreq[4]; +} __packed; + /* GPIO modes */ #define CP210X_SCI_GPIO_MODE_OFFSET 9 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) @@ -510,6 +529,27 @@ struct cp210x_single_port_config { #define CP210X_GPIO_MODE_OFFSET 8 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) +#define CP2108_GPIO_MODE_OFFSET 0 +#define CP2108_GPIO_MODE_MASK GENMASK(15, 0) + +/* CP2108 port configuration values */ +#define CP2108_GPIO0_ALTERNATE_FUNC BIT(0) +#define CP2108_GPIO1_ALTERNATE_FUNC BIT(1) +#define CP2108_GPIO2_ALTERNATE_FUNC BIT(2) +#define CP2108_GPIO3_ALTERNATE_FUNC BIT(3) +#define CP2108_GPIO4_ALTERNATE_FUNC BIT(4) +#define CP2108_GPIO5_ALTERNATE_FUNC BIT(5) +#define CP2108_GPIO6_ALTERNATE_FUNC BIT(6) +#define CP2108_GPIO7_ALTERNATE_FUNC BIT(7) +#define CP2108_GPIO8_ALTERNATE_FUNC BIT(8) +#define CP2108_GPIO9_ALTERNATE_FUNC BIT(9) +#define CP2108_GPIO10_ALTERNATE_FUNC BIT(10) +#define CP2108_GPIO11_ALTERNATE_FUNC BIT(11) +#define CP2108_GPIO12_ALTERNATE_FUNC BIT(12) +#define CP2108_GPIO13_ALTERNATE_FUNC BIT(13) +#define CP2108_GPIO14_ALTERNATE_FUNC BIT(14) +#define CP2108_GPIO15_ALTERNATE_FUNC BIT(15) + /* CP2105 port configuration values */ #define CP2105_GPIO0_TXLED_MODE BIT(0) #define CP2105_GPIO1_RXLED_MODE BIT(1) @@ -532,6 +572,12 @@ struct cp210x_gpio_write { u8 state; }; +/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x4 bytes on CP2108. */ +struct cp2108_gpio_write { + u16 mask; + u16 state; +} __packed; + /* * Helper to get interface number when we only have struct usb_serial. */ @@ -1298,50 +1344,73 @@ static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) struct cp210x_serial_private *priv = usb_get_serial_data(serial); u8 req_type = REQTYPE_DEVICE_TO_HOST; int result; - u8 buf; - - if (priv->partnum == CP210X_PARTNUM_CP2105) - req_type = REQTYPE_INTERFACE_TO_HOST; - result = usb_autopm_get_interface(serial->interface); - if (result) - return result; + if (priv->partnum == CP210X_PARTNUM_CP2108) { + u16 buf; - result = cp210x_read_vendor_block(serial, req_type, - CP210X_READ_LATCH, &buf, sizeof(buf)); - usb_autopm_put_interface(serial->interface); - if (result < 0) - return result; - - return !!(buf & BIT(gpio)); + req_type = REQTYPE_INTERFACE_TO_HOST; + result = usb_autopm_get_interface(serial->interface); + if (result) + return result; + result = cp210x_read_vendor_block(serial, req_type, + CP210X_READ_LATCH, &buf, sizeof(buf)); + usb_autopm_put_interface(serial->interface); + if (result < 0) + return result; + return !!(buf & BIT(gpio)); + } else { + u8 buf; + + if (priv->partnum == CP210X_PARTNUM_CP2105) + req_type = REQTYPE_INTERFACE_TO_HOST; + result = usb_autopm_get_interface(serial->interface); + if (result) + return result; + result = cp210x_read_vendor_block(serial, req_type, + CP210X_READ_LATCH, &buf, sizeof(buf)); + usb_autopm_put_interface(serial->interface); + if (result < 0) + return result; + return !!(buf & BIT(gpio)); + } } static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) { struct usb_serial *serial = gpiochip_get_data(gc); struct cp210x_serial_private *priv = usb_get_serial_data(serial); - struct cp210x_gpio_write buf; + struct cp210x_gpio_write u8_buf; + struct cp2108_gpio_write u16_buf; int result; if (value == 1) - buf.state = BIT(gpio); + u8_buf.state = BIT(gpio); else - buf.state = 0; + u8_buf.state = 0; - buf.mask = BIT(gpio); + u8_buf.mask = BIT(gpio); result = usb_autopm_get_interface(serial->interface); if (result) goto out; - if (priv->partnum == CP210X_PARTNUM_CP2105) { + if (priv->partnum == CP210X_PARTNUM_CP2105) result = cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE, - CP210X_WRITE_LATCH, &buf, - sizeof(buf)); + CP210X_WRITE_LATCH, &u8_buf, + sizeof(u8_buf)); + else if (priv->partnum == CP210X_PARTNUM_CP2108) { + if (value == 1) + u16_buf.state = cpu_to_le16(BIT(gpio)); + else + u16_buf.state = 0; + u16_buf.mask = cpu_to_le16(BIT(gpio)); + result = cp210x_write_vendor_block(serial, + REQTYPE_HOST_TO_INTERFACE, + CP210X_WRITE_LATCH, &u16_buf, + sizeof(u16_buf)); } else { - u16 wIndex = buf.state << 8 | buf.mask; - + u16 wIndex = u8_buf.state << 8 | u8_buf.mask; result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), CP210X_VENDOR_SPECIFIC, @@ -1350,7 +1419,6 @@ static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) wIndex, NULL, 0, USB_CTRL_SET_TIMEOUT); } - usb_autopm_put_interface(serial->interface); out: if (result < 0) { @@ -1420,6 +1488,75 @@ static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, return -ENOTSUPP; } +static int cp2108_gpio_init(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + struct cp210x_quad_port_config config; + u16 iface_config; + u16 gpio_latch; + int result; + u16 i; + + result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_PORTCONFIG, &config, + sizeof(config)); + if (result < 0) { + dev_warn(&serial->interface->dev, + "querying port config on cp2108 failed\n"); + return result; + } + priv->gc.ngpio = 16; + iface_config = config.EnhancedFxn_IFC[0]; + priv->gpio_pushpull = (u16)((le16_to_cpu(config.reset_state.Mode_PB[1]) & + CP2108_GPIO_MODE_MASK) >> + CP2108_GPIO_MODE_OFFSET); + gpio_latch = (u16)((le16_to_cpu(config.reset_state.Latch_PB[1]) & + CP2108_GPIO_MODE_MASK) >> + CP2108_GPIO_MODE_OFFSET); + + /* mark all pins which are not in GPIO mode */ + if (iface_config & CP2108_GPIO0_ALTERNATE_FUNC) /* GPIO 0 */ + priv->gpio_altfunc |= BIT(0); + if (iface_config & CP2108_GPIO1_ALTERNATE_FUNC) /* GPIO 1 */ + priv->gpio_altfunc |= BIT(1); + if (iface_config & CP2108_GPIO2_ALTERNATE_FUNC) /* GPIO 2 */ + priv->gpio_altfunc |= BIT(2); + if (iface_config & CP2108_GPIO3_ALTERNATE_FUNC) /* GPIO 3 */ + priv->gpio_altfunc |= BIT(3); + if (iface_config & CP2108_GPIO4_ALTERNATE_FUNC) /* GPIO 4 */ + priv->gpio_altfunc |= BIT(4); + if (iface_config & CP2108_GPIO5_ALTERNATE_FUNC) /* GPIO 5 */ + priv->gpio_altfunc |= BIT(5); + if (iface_config & CP2108_GPIO6_ALTERNATE_FUNC) /* GPIO 6 */ + priv->gpio_altfunc |= BIT(6); + if (iface_config & CP2108_GPIO7_ALTERNATE_FUNC) /* GPIO 7 */ + priv->gpio_altfunc |= BIT(7); + if (iface_config & CP2108_GPIO8_ALTERNATE_FUNC) /* GPIO 8 */ + priv->gpio_altfunc |= BIT(8); + if (iface_config & CP2108_GPIO9_ALTERNATE_FUNC) /* GPIO 9 */ + priv->gpio_altfunc |= BIT(9); + if (iface_config & CP2108_GPIO10_ALTERNATE_FUNC) /* GPIO 10 */ + priv->gpio_altfunc |= BIT(10); + if (iface_config & CP2108_GPIO11_ALTERNATE_FUNC) /* GPIO 11 */ + priv->gpio_altfunc |= BIT(11); + if (iface_config & CP2108_GPIO12_ALTERNATE_FUNC) /* GPIO 12 */ + priv->gpio_altfunc |= BIT(12); + if (iface_config & CP2108_GPIO13_ALTERNATE_FUNC) /* GPIO 13 */ + priv->gpio_altfunc |= BIT(13); + if (iface_config & CP2108_GPIO14_ALTERNATE_FUNC) /* GPIO 14 */ + priv->gpio_altfunc |= BIT(14); + if (iface_config & CP2108_GPIO15_ALTERNATE_FUNC) /* GPIO 15 */ + priv->gpio_altfunc |= BIT(15); + + for (i = 0; i < priv->gc.ngpio; ++i) { + /* Set direction to "input" if pin is open-drain and reset value is 1 */ + if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) + priv->gpio_input |= BIT(i); + } + + return 0; +} + /* * This function is for configuring GPIO using shared pins, where other signals * are made unavailable by configuring the use of GPIO. This is believed to be @@ -1649,6 +1786,14 @@ static int cp210x_gpio_init(struct usb_serial *serial) case CP210X_PARTNUM_CP2102N_QFN20: result = cp2102n_gpioconf_init(serial); break; + case CP210X_PARTNUM_CP2108: + /* + * CP2108 has 4 interfaces, but GPIOs at 4 interfaces are the same and shared. + * So just need init GPIO chip for 1 interface. + */ + if (cp210x_interface_num(serial) == 0) + result = cp2108_gpio_init(serial); + break; default: return 0; }