From patchwork Mon Jul 27 16:18:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Tachici X-Patchwork-Id: 11687123 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EAA8A138A for ; Mon, 27 Jul 2020 16:17:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFC4920714 for ; Mon, 27 Jul 2020 16:17:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731599AbgG0QRY (ORCPT ); Mon, 27 Jul 2020 12:17:24 -0400 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:15988 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731294AbgG0QQg (ORCPT ); Mon, 27 Jul 2020 12:16:36 -0400 Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 06RG7xmi019091; Mon, 27 Jul 2020 12:16:35 -0400 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com with ESMTP id 32ghn5eykp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 27 Jul 2020 12:16:34 -0400 Received: from SCSQMBX11.ad.analog.com (scsqmbx11.ad.analog.com [10.77.17.10]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 06RGGXh9050439 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Mon, 27 Jul 2020 12:16:33 -0400 Received: from SCSQMBX11.ad.analog.com (10.77.17.10) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Mon, 27 Jul 2020 09:16:32 -0700 Received: from zeus.spd.analog.com (10.64.82.11) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Mon, 27 Jul 2020 09:16:31 -0700 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 06RGGShj009603; Mon, 27 Jul 2020 12:16:30 -0400 From: To: , , CC: , Subject: [PATCH v7 2/9] hwmon: pmbus: adm1266: Add Block process call Date: Mon, 27 Jul 2020 19:18:07 +0300 Message-ID: <20200727161814.14076-3-alexandru.tachici@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200727161814.14076-1-alexandru.tachici@analog.com> References: <20200727161814.14076-1-alexandru.tachici@analog.com> MIME-Version: 1.0 X-ADIRoutedOnPrem: True X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-27_11:2020-07-27,2020-07-27 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 bulkscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 malwarescore=0 phishscore=0 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007270111 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Alexandru Tachici PmBus devices support Block Write-Block Read Process Call described in SMBus specification v 2.0 with the exception that Block writes and reads are permitted to have up 255 data bytes instead of max 32 bytes (SMBus). This patch adds Block WR process call support for ADM1266. Signed-off-by: Alexandru Tachici --- drivers/hwmon/pmbus/Kconfig | 1 + drivers/hwmon/pmbus/adm1266.c | 73 +++++++++++++++++++++++++++++++++++ 2 files changed, 74 insertions(+) diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index da34083e1ffd..c04068b665e6 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -28,6 +28,7 @@ config SENSORS_PMBUS config SENSORS_ADM1266 tristate "Analog Devices ADM1266 Sequencer" + select CRC8 help If you say yes here you get hardware monitoring support for Analog Devices ADM1266 Cascadable Super Sequencer. diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c index 79e8d90886b8..63975eba34ad 100644 --- a/drivers/hwmon/pmbus/adm1266.c +++ b/drivers/hwmon/pmbus/adm1266.c @@ -6,6 +6,7 @@ * Copyright 2020 Analog Devices Inc. */ +#include #include #include #include @@ -13,11 +14,80 @@ #include "pmbus.h" #include +#define ADM1266_PMBUS_BLOCK_MAX 255 + struct adm1266_data { struct pmbus_driver_info info; struct i2c_client *client; + struct mutex buf_mutex; + u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned; + u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned; }; +DECLARE_CRC8_TABLE(pmbus_crc_table); + +/* + * Different from Block Read as it sends data and waits for the slave to + * return a value dependent on that data. The protocol is simply a Write Block + * followed by a Read Block without the Read-Block command field and the + * Write-Block STOP bit. + */ +static int adm1266_pmbus_block_xfer(struct adm1266_data *data, u8 cmd, u8 w_len, u8 *data_w, + u8 *data_r) +{ + struct i2c_client *client = data->client; + struct i2c_msg msgs[2] = { + { + .addr = client->addr, + .flags = I2C_M_DMA_SAFE, + .buf = data->write_buf, + .len = w_len + 2, + }, + { + .addr = client->addr, + .flags = I2C_M_RD | I2C_M_DMA_SAFE, + .buf = data->read_buf, + .len = ADM1266_PMBUS_BLOCK_MAX + 2, + } + }; + u8 addr; + u8 crc; + int ret; + + mutex_lock(&data->buf_mutex); + + msgs[0].buf[0] = cmd; + msgs[0].buf[1] = w_len; + memcpy(&msgs[0].buf[2], data_w, w_len); + + ret = i2c_transfer(client->adapter, msgs, 2); + if (ret != 2) { + if (ret >= 0) + ret = -EPROTO; + return ret; + } + + if (client->flags & I2C_CLIENT_PEC) { + addr = i2c_8bit_addr_from_msg(&msgs[0]); + crc = crc8(pmbus_crc_table, &addr, 1, 0); + crc = crc8(pmbus_crc_table, msgs[0].buf, msgs[0].len, crc); + + addr = i2c_8bit_addr_from_msg(&msgs[1]); + crc = crc8(pmbus_crc_table, &addr, 1, crc); + crc = crc8(pmbus_crc_table, msgs[1].buf, msgs[1].buf[0] + 1, crc); + + if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) + return -EBADMSG; + } + + memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); + + ret = msgs[1].buf[0]; + mutex_unlock(&data->buf_mutex); + + return ret; +} + static int adm1266_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct adm1266_data *data; @@ -33,6 +103,9 @@ static int adm1266_probe(struct i2c_client *client, const struct i2c_device_id * for (i = 0; i < data->info.pages; i++) data->info.func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; + crc8_populate_msb(pmbus_crc_table, 0x7); + mutex_init(&data->buf_mutex); + return pmbus_do_probe(client, id, &data->info); }