From 604e57888499c149d0aca4b1ac39da07da040fcb Mon Sep 17 00:00:00 2001 From: Christophe RICARD Date: Sat, 13 Feb 2016 16:15:24 +0100 Subject: [PATCH] tpm/st33zp24/spi: Remove nbr_dummy_bytes variable usage nbr_dummy_bytes variable could be easily replaced by phy->latency in st33zp24_spi_send and st33zp24_spi_recv. Signed-off-by: Christophe Ricard Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/st33zp24/spi.c | 184 +++++++++++++------------------- 1 file changed, 72 insertions(+), 112 deletions(-) diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c index 6be51ac0c1f1..74c5fcc5c397 100644 --- a/drivers/char/tpm/st33zp24/spi.c +++ b/drivers/char/tpm/st33zp24/spi.c @@ -1,6 +1,6 @@ /* * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24 - * Copyright (C) 2009 - 2016 STMicroelectronics + * Copyright (C) 2009 - 2015 STMicroelectronics * * 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 @@ -19,10 +19,8 @@ #include #include #include -#include #include #include -#include #include #include @@ -68,7 +66,7 @@ struct st33zp24_spi_phy { struct spi_device *spi_device; - + struct spi_transfer spi_xfer; u8 tx_buf[ST33ZP24_SPI_BUFFER_SIZE]; u8 rx_buf[ST33ZP24_SPI_BUFFER_SIZE]; @@ -112,39 +110,42 @@ static int st33zp24_status_to_errno(u8 code) static int st33zp24_spi_send(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) { + u8 data = 0; int total_length = 0, ret = 0; struct st33zp24_spi_phy *phy = phy_id; struct spi_device *dev = phy->spi_device; - struct spi_transfer spi_xfer = { - .tx_buf = phy->tx_buf, - .rx_buf = phy->rx_buf, - }; + u8 *tx_buf = (u8 *)phy->spi_xfer.tx_buf; + u8 *rx_buf = phy->spi_xfer.rx_buf; /* Pre-Header */ - phy->tx_buf[total_length++] = TPM_WRITE_DIRECTION | LOCALITY0; - phy->tx_buf[total_length++] = tpm_register; + data = TPM_WRITE_DIRECTION | LOCALITY0; + memcpy(tx_buf + total_length, &data, sizeof(data)); + total_length++; + data = tpm_register; + memcpy(tx_buf + total_length, &data, sizeof(data)); + total_length++; if (tpm_size > 0 && tpm_register == TPM_DATA_FIFO) { - phy->tx_buf[total_length++] = tpm_size >> 8; - phy->tx_buf[total_length++] = tpm_size; + tx_buf[total_length++] = tpm_size >> 8; + tx_buf[total_length++] = tpm_size; } - memcpy(&phy->tx_buf[total_length], tpm_data, tpm_size); + memcpy(&tx_buf[total_length], tpm_data, tpm_size); total_length += tpm_size; - memset(&phy->tx_buf[total_length], TPM_DUMMY_BYTE, phy->latency); + memset(&tx_buf[total_length], TPM_DUMMY_BYTE, phy->latency); - spi_xfer.len = total_length + phy->latency; + phy->spi_xfer.len = total_length + phy->latency; - ret = spi_sync_transfer(dev, &spi_xfer, 1); + ret = spi_sync_transfer(dev, &phy->spi_xfer, 1); if (ret == 0) - ret = phy->rx_buf[total_length + phy->latency - 1]; + ret = rx_buf[total_length + phy->latency - 1]; return st33zp24_status_to_errno(ret); } /* st33zp24_spi_send() */ /* - * st33zp24_spi_read8_recv + * read8_recv * Recv byte from the TIS register according to the ST33ZP24 SPI protocol. * @param: phy_id, the phy description * @param: tpm_register, the tpm tis register where the data should be read @@ -152,37 +153,39 @@ static int st33zp24_spi_send(void *phy_id, u8 tpm_register, u8 *tpm_data, * @param: tpm_size, tpm TPM response size to read. * @return: should be zero if success else a negative error code. */ -static int st33zp24_spi_read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, - int tpm_size) +static int read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) { + u8 data = 0; int total_length = 0, ret; struct st33zp24_spi_phy *phy = phy_id; struct spi_device *dev = phy->spi_device; - struct spi_transfer spi_xfer = { - .tx_buf = phy->tx_buf, - .rx_buf = phy->rx_buf, - }; + u8 *tx_buf = (u8 *)phy->spi_xfer.tx_buf; + u8 *rx_buf = phy->spi_xfer.rx_buf; /* Pre-Header */ - phy->tx_buf[total_length++] = LOCALITY0; - phy->tx_buf[total_length++] = tpm_register; - - memset(&phy->tx_buf[total_length], TPM_DUMMY_BYTE, + data = LOCALITY0; + memcpy(tx_buf + total_length, &data, sizeof(data)); + total_length++; + data = tpm_register; + memcpy(tx_buf + total_length, &data, sizeof(data)); + total_length++; + + memset(&tx_buf[total_length], TPM_DUMMY_BYTE, phy->latency + tpm_size); - spi_xfer.len = total_length + phy->latency + tpm_size; + phy->spi_xfer.len = total_length + phy->latency + tpm_size; /* header + status byte + size of the data + status byte */ - ret = spi_sync_transfer(dev, &spi_xfer, 1); + ret = spi_sync_transfer(dev, &phy->spi_xfer, 1); if (tpm_size > 0 && ret == 0) { - ret = phy->rx_buf[total_length + phy->latency - 1]; + ret = rx_buf[total_length + phy->latency - 1]; - memcpy(tpm_data, phy->rx_buf + total_length + phy->latency, + memcpy(tpm_data, rx_buf + total_length + phy->latency, tpm_size); } return ret; -} /* st33zp24_spi_read8_reg() */ +} /* read8_reg() */ /* * st33zp24_spi_recv @@ -198,13 +201,13 @@ static int st33zp24_spi_recv(void *phy_id, u8 tpm_register, u8 *tpm_data, { int ret; - ret = st33zp24_spi_read8_reg(phy_id, tpm_register, tpm_data, tpm_size); + ret = read8_reg(phy_id, tpm_register, tpm_data, tpm_size); if (!st33zp24_status_to_errno(ret)) return tpm_size; return ret; } /* st33zp24_spi_recv() */ -static int st33zp24_spi_evaluate_latency(void *phy_id) +static int evaluate_latency(void *phy_id) { struct st33zp24_spi_phy *phy = phy_id; int latency = 1, status = 0; @@ -212,15 +215,9 @@ static int st33zp24_spi_evaluate_latency(void *phy_id) while (!status && latency < MAX_SPI_LATENCY) { phy->latency = latency; - status = st33zp24_spi_read8_reg(phy_id, TPM_INTF_CAPABILITY, - &data, 1); + status = read8_reg(phy_id, TPM_INTF_CAPABILITY, &data, 1); latency++; } - if (status < 0) - return status; - if (latency == MAX_SPI_LATENCY) - return -ENODEV; - return latency - 1; } /* evaluate_latency() */ @@ -229,59 +226,24 @@ static const struct st33zp24_phy_ops spi_phy_ops = { .recv = st33zp24_spi_recv, }; -static int st33zp24_spi_acpi_request_resources(struct spi_device *spi_dev) +#ifdef CONFIG_OF +static int tpm_stm_spi_of_request_resources(struct st33zp24_spi_phy *phy) { - struct st33zp24_spi_phy *phy = spi_get_drvdata(spi_dev); - const struct acpi_device_id *id; - struct gpio_desc *gpiod_lpcpd; - struct device *dev; - - if (!spi_dev) - return -EINVAL; - - dev = &spi_dev->dev; - - /* Match the struct device against a given list of ACPI IDs */ - id = acpi_match_device(dev->driver->acpi_match_table, dev); - if (!id) - return -ENODEV; - - /* Get LPCPD GPIO from ACPI */ - gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1, - GPIOD_OUT_HIGH); - if (IS_ERR(gpiod_lpcpd)) { - dev_err(dev, "Failed to retrieve lpcpd-gpios from acpi.\n"); - phy->io_lpcpd = -1; - /* - * lpcpd pin is not specified. This is not an issue as - * power management can be also managed by TPM specific - * commands. So leave with a success status code. - */ - return 0; - } - - phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd); - - return 0; -} - -static int st33zp24_spi_of_request_resources(struct spi_device *spi_dev) -{ - struct st33zp24_spi_phy *phy = spi_get_drvdata(spi_dev); struct device_node *pp; + struct spi_device *dev = phy->spi_device; int gpio; int ret; - pp = spi_dev->dev.of_node; + pp = dev->dev.of_node; if (!pp) { - dev_err(&spi_dev->dev, "No platform data\n"); + dev_err(&dev->dev, "No platform data\n"); return -ENODEV; } /* Get GPIO from device tree */ gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0); if (gpio < 0) { - dev_err(&spi_dev->dev, + dev_err(&dev->dev, "Failed to retrieve lpcpd-gpios from dts.\n"); phy->io_lpcpd = -1; /* @@ -292,20 +254,26 @@ static int st33zp24_spi_of_request_resources(struct spi_device *spi_dev) return 0; } /* GPIO request and configuration */ - ret = devm_gpio_request_one(&spi_dev->dev, gpio, + ret = devm_gpio_request_one(&dev->dev, gpio, GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD"); if (ret) { - dev_err(&spi_dev->dev, "Failed to request lpcpd pin\n"); + dev_err(&dev->dev, "Failed to request lpcpd pin\n"); return -ENODEV; } phy->io_lpcpd = gpio; return 0; } +#else +static int tpm_stm_spi_of_request_resources(struct st33zp24_spi_phy *phy) +{ + return -ENODEV; +} +#endif -static int st33zp24_spi_request_resources(struct spi_device *dev) +static int tpm_stm_spi_request_resources(struct spi_device *dev, + struct st33zp24_spi_phy *phy) { - struct st33zp24_spi_phy *phy = spi_get_drvdata(dev); struct st33zp24_platform_data *pdata; int ret; @@ -333,12 +301,13 @@ static int st33zp24_spi_request_resources(struct spi_device *dev) } /* - * st33zp24_spi_probe initialize the TPM device + * tpm_st33_spi_probe initialize the TPM device * @param: dev, the spi_device drescription (TPM SPI description). * @return: 0 in case of success. * or a negative value describing the error. */ -static int st33zp24_spi_probe(struct spi_device *dev) +static int +tpm_st33_spi_probe(struct spi_device *dev) { int ret; struct st33zp24_platform_data *pdata; @@ -357,25 +326,21 @@ static int st33zp24_spi_probe(struct spi_device *dev) return -ENOMEM; phy->spi_device = dev; - - spi_set_drvdata(dev, phy); - pdata = dev->dev.platform_data; if (!pdata && dev->dev.of_node) { - ret = st33zp24_spi_of_request_resources(dev); + ret = tpm_stm_spi_of_request_resources(phy); if (ret) return ret; } else if (pdata) { - ret = st33zp24_spi_request_resources(dev); - if (ret) - return ret; - } else if (ACPI_HANDLE(&dev->dev)) { - ret = st33zp24_spi_acpi_request_resources(dev); + ret = tpm_stm_spi_request_resources(dev, phy); if (ret) return ret; } - phy->latency = st33zp24_spi_evaluate_latency(phy); + phy->spi_xfer.tx_buf = phy->tx_buf; + phy->spi_xfer.rx_buf = phy->rx_buf; + + phy->latency = evaluate_latency(phy); if (phy->latency <= 0) return -ENODEV; @@ -384,11 +349,11 @@ static int st33zp24_spi_probe(struct spi_device *dev) } /* - * st33zp24_spi_remove remove the TPM device + * tpm_st33_spi_remove remove the TPM device * @param: client, the spi_device drescription (TPM SPI description). * @return: 0 in case of success. */ -static int st33zp24_spi_remove(struct spi_device *dev) +static int tpm_st33_spi_remove(struct spi_device *dev) { struct tpm_chip *chip = spi_get_drvdata(dev); @@ -401,34 +366,29 @@ static const struct spi_device_id st33zp24_spi_id[] = { }; MODULE_DEVICE_TABLE(spi, st33zp24_spi_id); +#ifdef CONFIG_OF static const struct of_device_id of_st33zp24_spi_match[] = { { .compatible = "st,st33zp24-spi", }, {} }; MODULE_DEVICE_TABLE(of, of_st33zp24_spi_match); - -static const struct acpi_device_id st33zp24_spi_acpi_match[] = { - {"SMO3324"}, - {} -}; -MODULE_DEVICE_TABLE(acpi, st33zp24_spi_acpi_match); +#endif static SIMPLE_DEV_PM_OPS(st33zp24_spi_ops, st33zp24_pm_suspend, st33zp24_pm_resume); -static struct spi_driver st33zp24_spi_driver = { +static struct spi_driver tpm_st33_spi_driver = { .driver = { .name = TPM_ST33_SPI, .pm = &st33zp24_spi_ops, .of_match_table = of_match_ptr(of_st33zp24_spi_match), - .acpi_match_table = ACPI_PTR(st33zp24_spi_acpi_match), }, - .probe = st33zp24_spi_probe, - .remove = st33zp24_spi_remove, + .probe = tpm_st33_spi_probe, + .remove = tpm_st33_spi_remove, .id_table = st33zp24_spi_id, }; -module_spi_driver(st33zp24_spi_driver); +module_spi_driver(tpm_st33_spi_driver); MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)"); MODULE_DESCRIPTION("STM TPM 1.2 SPI ST33 Driver"); -- 2.45.2