From patchwork Wed Nov 18 14:44:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Pasternak X-Patchwork-Id: 327650 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, 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 E757AC6379F for ; Wed, 18 Nov 2020 14:44:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5ED8F2168B for ; Wed, 18 Nov 2020 14:44:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727021AbgKROo3 (ORCPT ); Wed, 18 Nov 2020 09:44:29 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:48217 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727023AbgKROo3 (ORCPT ); Wed, 18 Nov 2020 09:44:29 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from vadimp@nvidia.com) with SMTP; 18 Nov 2020 16:44:24 +0200 Received: from r-build-lowlevel.mtr.labs.mlnx. (r-build-lowlevel.mtr.labs.mlnx [10.209.0.190]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 0AIEiIHw008040; Wed, 18 Nov 2020 16:44:24 +0200 From: Vadim Pasternak To: wsa@the-dreams.de Cc: peda@axentia.se, linux-i2c@vger.kernel.org, Vadim Pasternak Subject: [Re-send: PATCH i2c-next 5/6] i2c: mux: mlxcpld: Extend driver to support word address space devices Date: Wed, 18 Nov 2020 16:44:15 +0200 Message-Id: <20201118144416.184120-6-vadimp@nvidia.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20201118144416.184120-1-vadimp@nvidia.com> References: <20201118144416.184120-1-vadimp@nvidia.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Extend driver to allow I2C routing control through CPLD devices with word address space. Till now only CPLD devices with byte address space have been supported. Signed-off-by: Vadim Pasternak Reviewed-by: Michael Shych --- drivers/i2c/muxes/i2c-mux-mlxcpld.c | 57 +++++++++++++++++++++++++++-------- include/linux/platform_data/mlxcpld.h | 2 ++ 2 files changed, 47 insertions(+), 12 deletions(-) diff --git a/drivers/i2c/muxes/i2c-mux-mlxcpld.c b/drivers/i2c/muxes/i2c-mux-mlxcpld.c index 6bb8caecf8e8..c76180919fc3 100644 --- a/drivers/i2c/muxes/i2c-mux-mlxcpld.c +++ b/drivers/i2c/muxes/i2c-mux-mlxcpld.c @@ -21,11 +21,13 @@ * @last_chan - last register value * @client - I2C device client * @pdata: platform data + * @sel_buf: I2C message buffer for mux select 16 bits transactions */ struct mlxcpld_mux { u8 last_chan; struct i2c_client *client; struct mlxcpld_mux_plat_data pdata; + u8 sel_buf[3]; }; /* MUX logic description. @@ -60,26 +62,42 @@ struct mlxcpld_mux { * for this as they will try to lock adapter a second time. */ static int mlxcpld_mux_reg_write(struct i2c_adapter *adap, - struct mlxcpld_mux *mux, u8 val) + struct mlxcpld_mux *mux, int chan) { struct i2c_client *client = mux->client; - union i2c_smbus_data data = { .byte = val }; - - return __i2c_smbus_xfer(adap, client->addr, client->flags, - I2C_SMBUS_WRITE, mux->pdata.sel_reg_addr, - I2C_SMBUS_BYTE_DATA, &data); + union i2c_smbus_data data; + struct i2c_msg msg; + + switch (mux->pdata.reg_size) { + case 1: + data.byte = (chan < 0) ? 0 : chan; + return __i2c_smbus_xfer(adap, client->addr, client->flags, + I2C_SMBUS_WRITE, + mux->pdata.sel_reg_addr, + I2C_SMBUS_BYTE_DATA, &data); + case 2: + mux->sel_buf[mux->pdata.reg_size] = (chan < 0) ? 0 : + mux->pdata.adap_ids[chan]; + msg.addr = client->addr; + msg.buf = mux->sel_buf; + msg.len = mux->pdata.reg_size + 1; + msg.flags = 0; + return __i2c_transfer(adap, &msg, 1); + default: + return -EINVAL; + } } static int mlxcpld_mux_select_chan(struct i2c_mux_core *muxc, u32 chan) { struct mlxcpld_mux *mux = i2c_mux_priv(muxc); - u8 regval = chan + 1; int err = 0; /* Only select the channel if its different from the last channel */ - if (mux->last_chan != regval) { - err = mlxcpld_mux_reg_write(muxc->parent, mux, regval); - mux->last_chan = err < 0 ? 0 : regval; + chan++; + if (mux->last_chan != chan) { + err = mlxcpld_mux_reg_write(muxc->parent, mux, chan); + mux->last_chan = err < 0 ? 0 : chan; } return err; @@ -103,13 +121,26 @@ static int mlxcpld_mux_probe(struct platform_device *pdev) struct i2c_mux_core *muxc; int num, force; struct mlxcpld_mux *data; + u16 sel_reg_addr = 0; + u32 func; int err; if (!pdata) return -EINVAL; - if (!i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) + switch (pdata->reg_size) { + case 1: + func = I2C_FUNC_SMBUS_WRITE_BYTE_DATA; + break; + case 2: + func = I2C_FUNC_SMBUS_WRITE_WORD_DATA; + sel_reg_addr = cpu_to_be16(pdata->sel_reg_addr); + break; + default: + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, func)) return -ENODEV; muxc = i2c_mux_alloc(client->adapter, &pdev->dev, CPLD_MUX_MAX_NCHANS, @@ -122,6 +153,8 @@ static int mlxcpld_mux_probe(struct platform_device *pdev) data = i2c_mux_priv(muxc); data->client = client; memcpy(&data->pdata, pdata, sizeof(*pdata)); + /* Save mux select address for 16 bits transaction size. */ + memcpy(data->sel_buf, &sel_reg_addr, 2); data->last_chan = 0; /* force the first selection */ /* Create an adapter for each channel. */ diff --git a/include/linux/platform_data/mlxcpld.h b/include/linux/platform_data/mlxcpld.h index e6c18bf017dd..da4f7e8f5721 100644 --- a/include/linux/platform_data/mlxcpld.h +++ b/include/linux/platform_data/mlxcpld.h @@ -14,11 +14,13 @@ * @adap_ids - adapter array * @num_adaps - number of adapters * @sel_reg_addr - mux select register offset in CPLD space + * @reg_size: register size in bytes (default 0 - 1 byte data, 1 - 2 bytes data */ struct mlxcpld_mux_plat_data { int *adap_ids; int num_adaps; int sel_reg_addr; + u8 reg_size; }; #endif /* _LINUX_I2C_MLXCPLD_H */