| /* |
| * Simple synchronous userspace interface to SPI devices |
| * |
| * Copyright (C) 2006 SWAPP |
| * Andrea Paterniani <a.paterniani@swapp-eng.it> |
| * Copyright (C) 2007 David Brownell (simplification, cleanup) |
| * |
| * 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 |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| /* |
| * Modified by ST Microelectronics. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/ioctl.h> |
| #include <linux/fs.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| #include <linux/errno.h> |
| #include <linux/mutex.h> |
| #include <linux/slab.h> |
| #include <linux/compat.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/acpi.h> |
| #include <linux/pinctrl/consumer.h> |
| |
| #include <linux/spi/spi.h> |
| #include <linux/spi/spidev.h> |
| |
| #include <linux/gpio.h> |
| #include <linux/of_gpio.h> |
| |
| #include <linux/uaccess.h> |
| |
| #define ST21NFCD_MTK 1 |
| // #define WITH_SPI_CLK_MNGT 1 |
| |
| #ifdef ST21NFCD_MTK |
| #include <linux/platform_data/spi-mt65xx.h> |
| #endif // ST21NFCD_MTK |
| |
| #include "../st21nfc-i2c/st21nfc.h" |
| #include <soc/oppo/oppo_nfc.h> |
| |
| |
| /* |
| * This supports access to SPI devices using normal userspace I/O calls. |
| * Note that while traditional UNIX/POSIX I/O semantics are half duplex, |
| * and often mask message boundaries, full SPI support requires full duplex |
| * transfers. There are several kinds of internal message boundaries to |
| * handle chipselect management and other protocol options. |
| * |
| * SPI has a character major number assigned. We allocate minor numbers |
| * dynamically using a bitmask. You must use hotplug tools, such as udev |
| * (or mdev with busybox) to create and destroy the /dev/st54spi device |
| * nodes, since there is no fixed association of minor numbers with any |
| * particular SPI bus or device. |
| */ |
| //#define SPIDEV_MAJOR 0 /* dynamic */ |
| static int spidev_major; |
| #define N_SPI_MINORS 1 /* ... up to 256 */ |
| |
| static DECLARE_BITMAP(minors, N_SPI_MINORS); |
| |
| #define ST54SPI_IOC_RD_POWER _IOR(SPI_IOC_MAGIC, 99, __u32) |
| #define ST54SPI_IOC_WR_POWER _IOW(SPI_IOC_MAGIC, 99, __u32) |
| |
| /* Bit masks for spi_device.mode management. Note that incorrect |
| * settings for some settings can cause *lots* of trouble for other |
| * devices on a shared bus: |
| * |
| * - CS_HIGH ... this device will be active when it shouldn't be |
| * - 3WIRE ... when active, it won't behave as it should |
| * - NO_CS ... there will be no explicit message boundaries; this |
| * is completely incompatible with the shared bus model |
| * - READY ... transfers may proceed when they shouldn't. |
| * |
| * REVISIT should changing those flags be privileged? |
| */ |
| #define SPI_MODE_MASK \ |
| (SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | \ |
| SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP | \ |
| SPI_NO_CS | SPI_READY | SPI_TX_DUAL | \ |
| SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD) |
| |
| struct st54spi_data { |
| dev_t devt; |
| spinlock_t spi_lock; |
| struct spi_device *spi; |
| struct spi_device *spi_reset; |
| struct list_head device_entry; |
| |
| /* TX/RX buffers are NULL unless this device is open (users > 0) */ |
| struct mutex buf_lock; |
| unsigned int users; |
| u8 *tx_buffer; |
| u8 *rx_buffer; |
| u32 speed_hz; |
| |
| /* GPIO for SE_POWER_REQ / SE_nRESET */ |
| int power_or_nreset_gpio_mode; |
| int power_or_nreset_gpio; |
| int nfcc_needs_poweron; |
| int sehal_needs_poweron; |
| int se_is_poweron; |
| struct pinctrl *pctrl; |
| struct pinctrl_state *pctrl_mode_spi, *pctrl_mode_idle; |
| }; |
| |
| #define POWER_MODE_NONE -1 |
| #define POWER_MODE_ST54H 0 |
| #define POWER_MODE_ST54J 1 |
| |
| static LIST_HEAD(device_list); |
| static DEFINE_MUTEX(device_list_lock); |
| |
| static unsigned int bufsiz = 4096; |
| module_param(bufsiz, uint, 0444); |
| MODULE_PARM_DESC(bufsiz, "data bytes in biggest supported SPI message"); |
| |
| static bool debug_enabled = true; |
| #define VERBOSE 1 |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static ssize_t st54spi_sync( |
| struct st54spi_data *st54spi, struct spi_message *message) |
| { |
| DECLARE_COMPLETION_ONSTACK(done); |
| int status; |
| struct spi_device *spi; |
| |
| spin_lock_irq(&st54spi->spi_lock); |
| spi = st54spi->spi; |
| spin_unlock_irq(&st54spi->spi_lock); |
| |
| if (spi == NULL) |
| status = -ESHUTDOWN; |
| else |
| status = spi_sync(spi, message); |
| |
| if (status == 0) |
| status = message->actual_length; |
| |
| return status; |
| } |
| |
| static inline ssize_t st54spi_sync_write( |
| struct st54spi_data *st54spi, size_t len) |
| { |
| struct spi_transfer t = { |
| .tx_buf = st54spi->tx_buffer, |
| .len = len, |
| .speed_hz = st54spi->speed_hz, |
| }; |
| struct spi_message m; |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| return st54spi_sync(st54spi, &m); |
| } |
| |
| static inline ssize_t st54spi_sync_read( |
| struct st54spi_data *st54spi, size_t len) |
| { |
| struct spi_transfer t = { |
| .rx_buf = st54spi->rx_buffer, |
| .len = len, |
| .speed_hz = st54spi->speed_hz, |
| }; |
| struct spi_message m; |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| return st54spi_sync(st54spi, &m); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* Read-only message with current device setup */ |
| static ssize_t st54spi_read( |
| struct file *filp, char __user *buf, size_t count, loff_t *f_pos) |
| { |
| struct st54spi_data *st54spi; |
| ssize_t status = 0; |
| |
| /* chipselect only toggles at start or end of operation */ |
| if (count > bufsiz) |
| return -EMSGSIZE; |
| |
| st54spi = filp->private_data; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi Read: %d bytes\n", count); |
| |
| mutex_lock(&st54spi->buf_lock); |
| status = st54spi_sync_read(st54spi, count); |
| if (status > 0) { |
| unsigned long missing; |
| |
| missing = copy_to_user(buf, st54spi->rx_buffer, status); |
| if (missing == status) |
| status = -EFAULT; |
| else |
| status = status - missing; |
| } |
| mutex_unlock(&st54spi->buf_lock); |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi Read: status: %d\n", status); |
| |
| return status; |
| } |
| |
| /* Write-only message with current device setup */ |
| static ssize_t st54spi_write( |
| struct file *filp, const char __user *buf, size_t count, loff_t *f_pos) |
| { |
| struct st54spi_data *st54spi; |
| ssize_t status = 0; |
| unsigned long missing; |
| |
| /* chipselect only toggles at start or end of operation */ |
| if (count > bufsiz) |
| return -EMSGSIZE; |
| |
| st54spi = filp->private_data; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi Write: %d bytes\n", count); |
| |
| mutex_lock(&st54spi->buf_lock); |
| missing = copy_from_user(st54spi->tx_buffer, buf, count); |
| if (missing == 0) |
| status = st54spi_sync_write(st54spi, count); |
| else |
| status = -EFAULT; |
| mutex_unlock(&st54spi->buf_lock); |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi Write: status: %d\n", status); |
| |
| return status; |
| } |
| |
| static int st54spi_message( |
| struct st54spi_data *st54spi, |
| struct spi_ioc_transfer *u_xfers, |
| unsigned int n_xfers) |
| { |
| struct spi_message msg; |
| struct spi_transfer *k_xfers; |
| struct spi_transfer *k_tmp; |
| struct spi_ioc_transfer *u_tmp; |
| unsigned int n, total, tx_total, rx_total; |
| u8 *tx_buf, *rx_buf; |
| int status = -EFAULT; |
| |
| spi_message_init(&msg); |
| k_xfers = kcalloc(n_xfers, sizeof(*k_tmp), GFP_KERNEL); |
| if (k_xfers == NULL) |
| return -ENOMEM; |
| |
| /* Construct spi_message, copying any tx data to bounce buffer. |
| * We walk the array of user-provided transfers, using each one |
| * to initialize a kernel version of the same transfer. |
| */ |
| tx_buf = st54spi->tx_buffer; |
| rx_buf = st54spi->rx_buffer; |
| total = 0; |
| tx_total = 0; |
| rx_total = 0; |
| for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers; |
| n; n--, k_tmp++, u_tmp++) { |
| k_tmp->len = u_tmp->len; |
| |
| total += k_tmp->len; |
| /* Since the function returns the total length of transfers |
| * on success, restrict the total to positive int values to |
| * avoid the return value looking like an error. Also check |
| * each transfer length to avoid arithmetic overflow. |
| */ |
| if (total > INT_MAX || k_tmp->len > INT_MAX) { |
| status = -EMSGSIZE; |
| goto done; |
| } |
| |
| if (u_tmp->rx_buf) { |
| /* this transfer needs space in RX bounce buffer */ |
| rx_total += k_tmp->len; |
| if (rx_total > bufsiz) { |
| status = -EMSGSIZE; |
| goto done; |
| } |
| k_tmp->rx_buf = rx_buf; |
| if (!access_ok(VERIFY_WRITE, |
| (u8 __user *)(uintptr_t)u_tmp->rx_buf, |
| u_tmp->len)) |
| goto done; |
| rx_buf += k_tmp->len; |
| } |
| if (u_tmp->tx_buf) { |
| /* this transfer needs space in TX bounce buffer */ |
| tx_total += k_tmp->len; |
| if (tx_total > bufsiz) { |
| status = -EMSGSIZE; |
| goto done; |
| } |
| k_tmp->tx_buf = tx_buf; |
| if (copy_from_user(tx_buf, |
| (const u8 __user *)(uintptr_t)u_tmp->tx_buf, |
| u_tmp->len)) |
| goto done; |
| tx_buf += k_tmp->len; |
| } |
| |
| k_tmp->cs_change = !!u_tmp->cs_change; |
| k_tmp->tx_nbits = u_tmp->tx_nbits; |
| k_tmp->rx_nbits = u_tmp->rx_nbits; |
| k_tmp->bits_per_word = u_tmp->bits_per_word; |
| k_tmp->delay_usecs = u_tmp->delay_usecs; |
| k_tmp->speed_hz = u_tmp->speed_hz; |
| if (!k_tmp->speed_hz) |
| k_tmp->speed_hz = st54spi->speed_hz; |
| #ifdef VERBOSE |
| dev_dbg(&st54spi->spi->dev, " xfer len %u %s%s%s%dbits %u usec %uHz\n", |
| u_tmp->len, u_tmp->rx_buf ? "rx " : "", u_tmp->tx_buf ? "tx " : "", |
| u_tmp->cs_change ? "cs " : "", |
| u_tmp->bits_per_word ?: st54spi->spi->bits_per_word, |
| u_tmp->delay_usecs, u_tmp->speed_hz ?: st54spi->spi->max_speed_hz); |
| #endif |
| spi_message_add_tail(k_tmp, &msg); |
| } |
| |
| status = st54spi_sync(st54spi, &msg); |
| if (status < 0) |
| goto done; |
| |
| /* copy any rx data out of bounce buffer */ |
| rx_buf = st54spi->rx_buffer; |
| for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) { |
| if (u_tmp->rx_buf) { |
| if (__copy_to_user( |
| (u8 __user *)(uintptr_t)u_tmp->rx_buf, |
| rx_buf, u_tmp->len)) { |
| status = -EFAULT; |
| goto done; |
| } |
| rx_buf += u_tmp->len; |
| } |
| } |
| status = total; |
| |
| done: |
| kfree(k_xfers); |
| return status; |
| } |
| |
| static struct spi_ioc_transfer *st54spi_get_ioc_message( |
| unsigned int cmd, |
| struct spi_ioc_transfer __user *u_ioc, |
| unsigned int *n_ioc) |
| { |
| struct spi_ioc_transfer *ioc; |
| u32 tmp; |
| |
| /* Check type, command number and direction */ |
| if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC || |
| _IOC_NR(cmd) != _IOC_NR(SPI_IOC_MESSAGE(0)) || |
| _IOC_DIR(cmd) != _IOC_WRITE) |
| return ERR_PTR(-ENOTTY); |
| |
| tmp = _IOC_SIZE(cmd); |
| if ((tmp % sizeof(struct spi_ioc_transfer)) != 0) |
| return ERR_PTR(-EINVAL); |
| |
| *n_ioc = tmp / sizeof(struct spi_ioc_transfer); |
| if (*n_ioc == 0) |
| return NULL; |
| |
| /* copy into scratch area */ |
| ioc = kmalloc(tmp, GFP_KERNEL); |
| if (!ioc) |
| return ERR_PTR(-ENOMEM); |
| |
| if (__copy_from_user(ioc, u_ioc, tmp)) { |
| kfree(ioc); |
| return ERR_PTR(-EFAULT); |
| } |
| return ioc; |
| } |
| |
| static void st54spi_power_off(struct st54spi_data *st54spi) |
| { |
| int ret; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "%s\n", __func__); |
| |
| // Set NSS pin as highZ (ST54H and ST54J). |
| |
| // Change NSS polarity to have NSS low. |
| ret = pinctrl_select_state(st54spi->pctrl, st54spi->pctrl_mode_idle); |
| |
| if (ret < 0) |
| dev_err(&st54spi->spi->dev, "%s : change NSS management to High Z failed!\n", __func__); |
| |
| // Set SE_PWR_REQ / SE_nRESET to low |
| if (st54spi->power_or_nreset_gpio) |
| gpio_set_value(st54spi->power_or_nreset_gpio, 0); |
| |
| // if ST54H block access to SPI in case this is done during a CLF reset |
| if (st54spi->power_or_nreset_gpio_mode == POWER_MODE_ST54H) { |
| // disallow access to SPI r/w |
| if (st54spi->spi) { |
| spin_lock_irq(&st54spi->spi_lock); |
| st54spi->spi_reset = st54spi->spi; |
| st54spi->spi = NULL; |
| spin_unlock_irq(&st54spi->spi_lock); |
| } |
| |
| // Give time to the CLF to detect falling SE_PWR_REQ |
| // and pull down the line before continue. |
| usleep_range(2000, 4500); |
| } |
| |
| #ifdef WITH_SPI_CLK_MNGT |
| // no need for the SPI clock to be enabled. |
| dev_info(&st54spi->spi->dev, "%s : disabling PMU clock of SPI subsystem\n", __func__); |
| mt_spi_disable_master_clk(st54spi->spi); |
| #endif // WITH_SPI_CLK_MNGT |
| |
| st54spi->se_is_poweron = 0; |
| } |
| |
| static void st54spi_power_on(struct st54spi_data *st54spi) |
| { |
| int ret; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "%s\n", __func__); |
| #ifdef WITH_SPI_CLK_MNGT |
| // the SPI clock needs to be enabled. |
| dev_info(&st54spi->spi->dev, "%s : enabling PMU clock of SPI subsystem\n", __func__); |
| mt_spi_enable_master_clk(st54spi->spi); |
| #endif // WITH_SPI_CLK_MNGT |
| |
| // set SE_PWR_REQ / SE_nRESET to high and wait for CLF + eSE reaction |
| if (st54spi->power_or_nreset_gpio) { |
| gpio_set_value(st54spi->power_or_nreset_gpio, 1); |
| usleep_range(1000, 1500); |
| } |
| |
| // Set NSS pin for the SPI function. |
| ret = pinctrl_select_state(st54spi->pctrl, st54spi->pctrl_mode_spi); |
| |
| if (ret < 0) |
| dev_err(&st54spi->spi->dev, "%s : change NSS management to SPI failed!\n", __func__); |
| |
| usleep_range(4000, 5000); |
| |
| if (st54spi->power_or_nreset_gpio_mode == POWER_MODE_ST54H) { |
| // re-allow SPI xfers |
| if (st54spi->spi_reset) { |
| spin_lock_irq(&st54spi->spi_lock); |
| st54spi->spi = st54spi->spi_reset; |
| st54spi->spi_reset = NULL; |
| spin_unlock_irq(&st54spi->spi_lock); |
| } |
| } |
| |
| st54spi->se_is_poweron = 1; |
| } |
| |
| static void st54spi_power_set(struct st54spi_data *st54spi, int val) |
| { |
| if (!st54spi) |
| return; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi sehal pwr_req: %d\n", val); |
| |
| if (val) { |
| st54spi->sehal_needs_poweron = 1; |
| if (st54spi->se_is_poweron == 0) |
| st54spi_power_on(st54spi); |
| } else { |
| st54spi->sehal_needs_poweron = 0; |
| if ((st54spi->se_is_poweron == 1) && |
| (st54spi->nfcc_needs_poweron == 0)) |
| // we don t need power anymore |
| st54spi_power_off(st54spi); |
| } |
| } |
| |
| static int st54spi_power_get(struct st54spi_data *st54spi) |
| { |
| if (st54spi->power_or_nreset_gpio) |
| return gpio_get_value(st54spi->power_or_nreset_gpio); |
| return 0; |
| } |
| |
| static long st54spi_ioctl( |
| struct file *filp, unsigned int cmd, unsigned long arg) |
| { |
| int err = 0; |
| int retval = 0; |
| struct st54spi_data *st54spi; |
| struct spi_device *spi; |
| u32 tmp; |
| unsigned int n_ioc; |
| struct spi_ioc_transfer *ioc; |
| |
| /* Check type and command number */ |
| if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC) |
| return -ENOTTY; |
| |
| /* Check access direction once here; don't repeat below. |
| * IOC_DIR is from the user perspective, while access_ok is |
| * from the kernel perspective; so they look reversed. |
| */ |
| if (_IOC_DIR(cmd) & _IOC_READ) |
| err = !access_ok(VERIFY_WRITE, |
| (void __user *)arg, _IOC_SIZE(cmd)); |
| if (err == 0 && _IOC_DIR(cmd) & _IOC_WRITE) |
| err = !access_ok(VERIFY_READ, |
| (void __user *)arg, _IOC_SIZE(cmd)); |
| if (err) |
| return -EFAULT; |
| |
| /* guard against device removal before, or while, |
| * we issue this ioctl. |
| */ |
| st54spi = filp->private_data; |
| spin_lock_irq(&st54spi->spi_lock); |
| spi = spi_dev_get(st54spi->spi); |
| spin_unlock_irq(&st54spi->spi_lock); |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi ioctl cmd %d\n", cmd); |
| |
| if (spi == NULL) |
| return -ESHUTDOWN; |
| |
| /* use the buffer lock here for triple duty: |
| * - prevent I/O (from us) so calling spi_setup() is safe; |
| * - prevent concurrent SPI_IOC_WR_* from morphing |
| * data fields while SPI_IOC_RD_* reads them; |
| * - SPI_IOC_MESSAGE needs the buffer locked "normally". |
| */ |
| mutex_lock(&st54spi->buf_lock); |
| |
| switch (cmd) { |
| /* read requests */ |
| case SPI_IOC_RD_MODE: |
| retval = __put_user( |
| spi->mode & SPI_MODE_MASK, (__u8 __user *)arg); |
| break; |
| case SPI_IOC_RD_MODE32: |
| retval = __put_user( |
| spi->mode & SPI_MODE_MASK, (__u32 __user *)arg); |
| break; |
| case SPI_IOC_RD_LSB_FIRST: |
| retval = __put_user( |
| (spi->mode & SPI_LSB_FIRST) ? |
| 1 : 0, (__u8 __user *)arg); |
| break; |
| case SPI_IOC_RD_BITS_PER_WORD: |
| retval = __put_user( |
| spi->bits_per_word, (__u8 __user *)arg); |
| break; |
| case SPI_IOC_RD_MAX_SPEED_HZ: |
| retval = __put_user( |
| st54spi->speed_hz, (__u32 __user *)arg); |
| break; |
| case ST54SPI_IOC_RD_POWER: |
| retval = __put_user( |
| st54spi_power_get(st54spi), (__u32 __user *)arg); |
| break; |
| |
| /* write requests */ |
| case SPI_IOC_WR_MODE: |
| case SPI_IOC_WR_MODE32: |
| if (cmd == SPI_IOC_WR_MODE) |
| retval = __get_user(tmp, (u8 __user *)arg); |
| else |
| retval = __get_user(tmp, (u32 __user *)arg); |
| if (retval == 0) { |
| u32 save = spi->mode; |
| |
| if (tmp & ~SPI_MODE_MASK) { |
| retval = -EINVAL; |
| break; |
| } |
| |
| tmp |= spi->mode & ~SPI_MODE_MASK; |
| spi->mode = (u16)tmp; |
| retval = spi_setup(spi); |
| if (retval < 0) |
| spi->mode = save; |
| else |
| dev_dbg(&spi->dev, "spi mode %x\n", tmp); |
| } |
| break; |
| case SPI_IOC_WR_LSB_FIRST: |
| retval = __get_user(tmp, (__u8 __user *)arg); |
| if (retval == 0) { |
| u32 save = spi->mode; |
| |
| if (tmp) |
| spi->mode |= SPI_LSB_FIRST; |
| else |
| spi->mode &= ~SPI_LSB_FIRST; |
| retval = spi_setup(spi); |
| if (retval < 0) |
| spi->mode = save; |
| else |
| dev_dbg(&spi->dev, |
| "%csb first\n", tmp ? |
| 'l' : 'm'); |
| } |
| break; |
| case SPI_IOC_WR_BITS_PER_WORD: |
| retval = __get_user(tmp, (__u8 __user *)arg); |
| if (retval == 0) { |
| u8 save = spi->bits_per_word; |
| |
| spi->bits_per_word = tmp; |
| retval = spi_setup(spi); |
| if (retval < 0) |
| spi->bits_per_word = save; |
| else |
| dev_dbg(&spi->dev, "%d bits per word\n", tmp); |
| } |
| break; |
| case SPI_IOC_WR_MAX_SPEED_HZ: |
| retval = __get_user(tmp, (__u32 __user *)arg); |
| if (retval == 0) { |
| u32 save = spi->max_speed_hz; |
| |
| spi->max_speed_hz = tmp; |
| retval = spi_setup(spi); |
| if (retval >= 0) |
| st54spi->speed_hz = tmp; |
| else |
| dev_dbg(&spi->dev, "%d Hz (max)\n", tmp); |
| spi->max_speed_hz = save; |
| } |
| break; |
| case ST54SPI_IOC_WR_POWER: |
| retval = __get_user(tmp, (__u32 __user *)arg); |
| if (retval == 0) { |
| st54spi_power_set(st54spi, tmp ? 1 : 0); |
| dev_dbg(&spi->dev, "SE_POWER_REQ/SE_NRESET set: %d\n", tmp); |
| } |
| break; |
| |
| default: |
| /* segmented and/or full-duplex I/O request */ |
| /* Check message and copy into scratch area */ |
| ioc = st54spi_get_ioc_message( |
| cmd, (struct spi_ioc_transfer __user *)arg, &n_ioc); |
| if (IS_ERR(ioc)) { |
| retval = PTR_ERR(ioc); |
| break; |
| } |
| if (!ioc) |
| break; /* n_ioc is also 0 */ |
| |
| /* translate to spi_message, execute */ |
| retval = st54spi_message(st54spi, ioc, n_ioc); |
| kfree(ioc); |
| break; |
| } |
| |
| mutex_unlock(&st54spi->buf_lock); |
| spi_dev_put(spi); |
| |
| if (debug_enabled) |
| dev_info(&spi->dev, "st54spi ioctl retval %d\n", retval); |
| |
| return retval; |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static long st54spi_compat_ioc_message( |
| struct file *filp, unsigned int cmd, unsigned long arg) { |
| struct spi_ioc_transfer __user *u_ioc; |
| int retval = 0; |
| struct st54spi_data *st54spi; |
| struct spi_device *spi; |
| unsigned int n_ioc, n; |
| struct spi_ioc_transfer *ioc; |
| |
| u_ioc = (struct spi_ioc_transfer __user *)compat_ptr(arg); |
| if (!access_ok(VERIFY_READ, u_ioc, _IOC_SIZE(cmd))) |
| return -EFAULT; |
| |
| /* guard against device removal before, or while, |
| * we issue this ioctl. |
| */ |
| st54spi = filp->private_data; |
| spin_lock_irq(&st54spi->spi_lock); |
| spi = spi_dev_get(st54spi->spi); |
| spin_unlock_irq(&st54spi->spi_lock); |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi compat_ioctl cmd %d\n", cmd); |
| if (spi == NULL) |
| return -ESHUTDOWN; |
| |
| /* SPI_IOC_MESSAGE needs the buffer locked "normally" */ |
| mutex_lock(&st54spi->buf_lock); |
| |
| /* Check message and copy into scratch area */ |
| ioc = st54spi_get_ioc_message(cmd, u_ioc, &n_ioc); |
| if (IS_ERR(ioc)) { |
| retval = PTR_ERR(ioc); |
| goto done; |
| } |
| if (!ioc) |
| goto done; /* n_ioc is also 0 */ |
| |
| /* Convert buffer pointers */ |
| for (n = 0; n < n_ioc; n++) { |
| ioc[n].rx_buf = (uintptr_t)compat_ptr(ioc[n].rx_buf); |
| ioc[n].tx_buf = (uintptr_t)compat_ptr(ioc[n].tx_buf); |
| } |
| |
| /* translate to spi_message, execute */ |
| retval = st54spi_message(st54spi, ioc, n_ioc); |
| kfree(ioc); |
| |
| done: |
| mutex_unlock(&st54spi->buf_lock); |
| spi_dev_put(spi); |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi compat_ioctl retval %d\n", retval); |
| return retval; |
| } |
| |
| static long st54spi_compat_ioctl( |
| struct file *filp, unsigned int cmd, unsigned long arg) |
| { |
| if (_IOC_TYPE(cmd) == SPI_IOC_MAGIC && |
| _IOC_NR(cmd) == _IOC_NR(SPI_IOC_MESSAGE(0)) && |
| _IOC_DIR(cmd) == _IOC_WRITE) |
| return st54spi_compat_ioc_message(filp, cmd, arg); |
| |
| return st54spi_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); |
| } |
| #else |
| #define st54spi_compat_ioctl NULL |
| #endif /* CONFIG_COMPAT */ |
| |
| static int st54spi_open(struct inode *inode, struct file *filp) |
| { |
| struct st54spi_data *st54spi; |
| int status = -ENXIO; |
| |
| mutex_lock(&device_list_lock); |
| |
| list_for_each_entry(st54spi, &device_list, device_entry) { |
| if (st54spi->devt == inode->i_rdev) { |
| status = 0; |
| break; |
| } |
| } |
| |
| if (status) { |
| dev_dbg(&st54spi->spi->dev, "st54spi: nothing for minor %d\n", iminor(inode)); |
| goto err_find_dev; |
| } |
| |
| // Authorize only 1 process to open the device. |
| if (st54spi->users > 0) { |
| dev_err(&st54spi->spi->dev, "%d: already open\n"); |
| mutex_unlock(&device_list_lock); |
| return -EBUSY; |
| } |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi: open\n"); |
| |
| if (!st54spi->tx_buffer) { |
| st54spi->tx_buffer = kmalloc(bufsiz, GFP_KERNEL); |
| if (!st54spi->tx_buffer) { |
| // dev_dbg(&st54spi->spi->dev, "open/ENOMEM\n"); |
| status = -ENOMEM; |
| goto err_find_dev; |
| } |
| } |
| |
| if (!st54spi->rx_buffer) { |
| st54spi->rx_buffer = kmalloc(bufsiz, GFP_KERNEL); |
| if (!st54spi->rx_buffer) { |
| // dev_dbg(&st54spi->spi->dev, "open/ENOMEM\n"); |
| status = -ENOMEM; |
| goto err_alloc_rx_buf; |
| } |
| } |
| |
| st54spi->users++; |
| filp->private_data = st54spi; |
| nonseekable_open(inode, filp); |
| |
| mutex_unlock(&device_list_lock); |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi: open - force power on\n"); |
| st54spi_power_set(st54spi, 1); |
| return 0; |
| |
| err_alloc_rx_buf: |
| kfree(st54spi->tx_buffer); |
| st54spi->tx_buffer = NULL; |
| err_find_dev: |
| mutex_unlock(&device_list_lock); |
| return status; |
| } |
| |
| static int st54spi_release(struct inode *inode, struct file *filp) |
| { |
| struct st54spi_data *st54spi; |
| |
| mutex_lock(&device_list_lock); |
| st54spi = filp->private_data; |
| filp->private_data = NULL; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi: release\n"); |
| |
| /* last close? */ |
| st54spi->users--; |
| if (!st54spi->users) { |
| int dofree; |
| |
| if (debug_enabled) |
| dev_info(&st54spi->spi->dev, "st54spi: release - may allow power off\n"); |
| |
| st54spi_power_set(st54spi, 0); |
| |
| kfree(st54spi->tx_buffer); |
| st54spi->tx_buffer = NULL; |
| |
| kfree(st54spi->rx_buffer); |
| st54spi->rx_buffer = NULL; |
| |
| spin_lock_irq(&st54spi->spi_lock); |
| if (st54spi->spi) |
| st54spi->speed_hz = st54spi->spi->max_speed_hz; |
| |
| /* ... after we unbound from the underlying device? */ |
| dofree = ((st54spi->spi == NULL) && |
| (st54spi->spi_reset == NULL)); |
| spin_unlock_irq(&st54spi->spi_lock); |
| |
| if (dofree) |
| kfree(st54spi); |
| } |
| mutex_unlock(&device_list_lock); |
| |
| return 0; |
| } |
| |
| static const struct file_operations st54spi_fops = { |
| .owner = THIS_MODULE, |
| /* REVISIT switch to aio primitives, so that userspace |
| * gets more complete API coverage. It'll simplify things |
| * too, except for the locking. |
| */ |
| .write = st54spi_write, |
| .read = st54spi_read, |
| .unlocked_ioctl = st54spi_ioctl, |
| .compat_ioctl = st54spi_compat_ioctl, |
| .open = st54spi_open, |
| .release = st54spi_release, |
| .llseek = no_llseek, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* The main reason to have this class is to make mdev/udev create the |
| * /dev/st54spi character device nodes exposing our userspace API. |
| * It also simplifies memory management. |
| */ |
| |
| static struct class *st54spi_class; |
| |
| static const struct of_device_id st54spi_dt_ids[] = { |
| {.compatible = "st,st54spi"}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, st54spi_dt_ids); |
| |
| #ifdef CONFIG_ACPI |
| |
| /* Dummy SPI devices not to be used in production systems */ |
| #define SPIDEV_ACPI_DUMMY 1 |
| |
| static const struct acpi_device_id st54spi_acpi_ids[] = { |
| /* |
| * The ACPI SPT000* devices are only meant for development and |
| * testing. Systems used in production should have a proper ACPI |
| * description of the connected peripheral and they should also use |
| * a proper driver instead of poking directly to the SPI bus. |
| */ |
| {"SPT0001", SPIDEV_ACPI_DUMMY}, |
| {"SPT0002", SPIDEV_ACPI_DUMMY}, |
| {"SPT0003", SPIDEV_ACPI_DUMMY}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(acpi, st54spi_acpi_ids); |
| |
| static void st54spi_probe_acpi(struct spi_device *spi) |
| { |
| const struct acpi_device_id *id; |
| |
| if (!has_acpi_companion(&spi->dev)) |
| return; |
| |
| id = acpi_match_device(st54spi_acpi_ids, &spi->dev); |
| if (WARN_ON(!id)) |
| return; |
| } |
| #else |
| static inline void st54spi_probe_acpi(struct spi_device *spi) {} |
| #endif |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int st54spi_parse_dt(struct device *dev, struct st54spi_data *pdata) |
| { |
| int r = 0; |
| struct device_node *np = dev->of_node; |
| |
| np = of_find_compatible_node(NULL, NULL, "st,st54spi"); |
| |
| if (np) { |
| const char *power_mode; |
| #if (!defined(CONFIG_MTK_GPIO) || defined(CONFIG_MTK_GPIOLIB_STAND)) |
| r = of_get_named_gpio(np, "gpio-power_nreset-std", 0); |
| if (r < 0) |
| dev_info(dev, "%s: get ST54 failed (%d)", __FILE__, r); |
| else |
| pdata->power_or_nreset_gpio = r; |
| r = 0; |
| #else |
| of_property_read_u32_array( |
| np, "gpio-power_nreset", &(pdata->power_or_nreset_gpio), 1); |
| #endif |
| |
| // Read power mode. |
| power_mode = of_get_property(np, "power_mode", NULL); |
| if (!power_mode) { |
| dev_info(dev, "%s: Default power mode: ST54H\n", __FILE__); |
| pdata->power_or_nreset_gpio_mode = POWER_MODE_ST54H; |
| } else if (!strcmp(power_mode, "ST54J")) { |
| dev_info(dev, "%s: Power mode: ST54J\n", __FILE__); |
| pdata->power_or_nreset_gpio_mode = POWER_MODE_ST54J; |
| } else if (!strcmp(power_mode, "ST54H")) { |
| dev_info(dev, "%s: Power mode: ST54H\n", __FILE__); |
| pdata->power_or_nreset_gpio_mode = POWER_MODE_ST54H; |
| } else if (!strcmp(power_mode, "none")) { |
| dev_info(dev, "%s: Power mode: none\n", __FILE__); |
| pdata->power_or_nreset_gpio_mode = POWER_MODE_NONE; |
| } else { |
| dev_err(dev, "%s: Power mode unknown: %s\n", __FILE__, power_mode); |
| return -1; |
| } |
| } else { |
| dev_info(dev, "%s : get num err.\n", __func__); |
| return -1; |
| } |
| |
| // We need to use pinmux to control NSS |
| pdata->pctrl = devm_pinctrl_get(dev); |
| if (IS_ERR(pdata->pctrl)) { |
| dev_err(dev, "%s: Unable to allocate pinctrl: %d\n", __FILE__, PTR_ERR(pdata->pctrl)); |
| return -1; |
| } |
| |
| pdata->pctrl_mode_spi = pinctrl_lookup_state(pdata->pctrl, "pinctrl_state_mode_spi"); |
| if (IS_ERR(pdata->pctrl_mode_spi)) { |
| dev_err(dev, "%s: Unable to find pinctrl_state_mode_spi: %d\n", |
| __FILE__, PTR_ERR(pdata->pctrl_mode_spi)); |
| return -1; |
| } |
| |
| pdata->pctrl_mode_idle = pinctrl_lookup_state(pdata->pctrl, "pinctrl_state_mode_idle"); |
| if (IS_ERR(pdata->pctrl_mode_idle)) { |
| dev_err(dev, "%s: Unable to find pinctrl_state_mode_idle: %d\n", |
| __FILE__, PTR_ERR(pdata->pctrl_mode_idle)); |
| return -1; |
| } |
| dev_info(dev, "[dsc]%s : pinctrl initialized\n", __func__); |
| |
| dev_info(dev, "[dsc]%s : get power_or_nreset_gpio[%d]\n", __func__, pdata->power_or_nreset_gpio); |
| return r; |
| } |
| |
| #ifndef MODULE |
| static void st54spi_st21nfc_cb(int dir, void *data) |
| { |
| struct st54spi_data *st54spi = (struct st54spi_data *)data; |
| |
| if (!st54spi) |
| return; |
| dev_info(&st54spi->spi->dev, "%s : dir %d data %p\n", __func__, dir, st54spi); |
| |
| switch (dir) { |
| case ST54SPI_CB_RESET_START: |
| if (st54spi->se_is_poweron) |
| st54spi_power_off(st54spi); |
| break; |
| |
| case ST54SPI_CB_RESET_END: |
| // wait for the CLF to boot once nRESET is released |
| usleep_range(4000, 8000); |
| |
| st54spi_power_on(st54spi); |
| break; |
| |
| case ST54SPI_CB_ESE_USED: |
| st54spi->nfcc_needs_poweron = 1; |
| if (st54spi->se_is_poweron == 0) |
| st54spi_power_on(st54spi); |
| break; |
| |
| case ST54SPI_CB_ESE_NOT_USED: |
| st54spi->nfcc_needs_poweron = 0; |
| if ((st54spi->se_is_poweron == 1) && |
| (st54spi->sehal_needs_poweron == 0)) |
| // we don t need power anymore |
| st54spi_power_off(st54spi); |
| break; |
| } |
| } |
| #endif // !MODULE |
| |
| /* Change CS_TIME for ST54 */ |
| #ifdef ST21NFCD_MTK |
| // Unit is 1/109.2 us. |
| static struct mtk_chip_config st54spi_chip_info = { |
| .cs_setuptime = 2184, // 20 us |
| }; |
| #endif |
| |
| static int st54spi_probe(struct spi_device *spi) |
| { |
| struct st54spi_data *st54spi; |
| int status, ret; |
| unsigned long minor; |
| #ifdef ST21NFCD_MTK |
| struct mtk_chip_config *chip_config = spi->controller_data; |
| #endif |
| //#ifdef VENDOR_EDIT |
| //Zhou.Zheng@CN.NFC.Basic.Hardware,2674926, 2019/12/16, |
| //Add for : ST NXP chip common software |
| CHECK_NFC_CHIP(ST54H); |
| //#endif /* VENDOR_EDIT */ |
| |
| /* |
| * st54spi should never be referenced in DT without a specific |
| * compatible string, it is a Linux implementation thing |
| * rather than a description of the hardware. |
| */ |
| |
| st54spi_probe_acpi(spi); |
| |
| /* Allocate driver data */ |
| st54spi = kzalloc(sizeof(*st54spi), GFP_KERNEL); |
| if (!st54spi) |
| return -ENOMEM; |
| |
| /* Initialize the driver data */ |
| st54spi->spi = spi; |
| spin_lock_init(&st54spi->spi_lock); |
| mutex_init(&st54spi->buf_lock); |
| |
| INIT_LIST_HEAD(&st54spi->device_entry); |
| |
| /* If we can allocate a minor number, hook up this device. |
| * Reusing minors is fine so long as udev or mdev is working. |
| */ |
| mutex_lock(&device_list_lock); |
| minor = find_first_zero_bit(minors, N_SPI_MINORS); |
| if (minor < N_SPI_MINORS) { |
| struct device *dev; |
| |
| st54spi->devt = MKDEV(spidev_major, minor); |
| dev = device_create(st54spi_class, &spi->dev, st54spi->devt, |
| // spidev, "spidev%d.%d", |
| // spi->master->bus_num, spi->chip_select); |
| st54spi, "st54spi"); |
| status = PTR_ERR_OR_ZERO(dev); |
| } else { |
| dev_dbg(&spi->dev, "no minor number available!\n"); |
| status = -ENODEV; |
| } |
| if (status == 0) { |
| set_bit(minor, minors); |
| list_add(&st54spi->device_entry, &device_list); |
| } |
| mutex_unlock(&device_list_lock); |
| |
| st54spi->speed_hz = spi->max_speed_hz; |
| dev_dbg(&spi->dev, "st54spi->speed_hz=%d\n", st54spi->speed_hz); |
| // { |
| // /* fixed SPI clock speed: 109200000 */ |
| // int period = DIV_ROUND_UP(109200000, st54spi->speed_hz); |
| |
| // st54spi_chip_info.cs_idletime = period; |
| // st54spi_chip_info.cs_holdtime = period; |
| // } |
| |
| #ifdef ST21NFCD_MTK |
| // set timings for ST54 |
| if (chip_config == NULL) { |
| spi->controller_data = (void *)&st54spi_chip_info; |
| dev_dbg(&spi->dev, "Replaced chip_info!\n"); |
| } else { |
| chip_config->cs_setuptime = st54spi_chip_info.cs_setuptime; |
| chip_config->cs_idletime = st54spi_chip_info.cs_idletime; |
| chip_config->cs_holdtime = st54spi_chip_info.cs_holdtime; |
| dev_dbg(&spi->dev, "Added into chip_info!\n"); |
| } |
| #else |
| dev_err(&spi->dev, "%s : TSU_NSS configuration be implemented!\n", __func__); |
| // platform-specific method to configure the delay beween NSS slave |
| // selection and the start of data transfer (clk). |
| // If no specific method required, you can comment above line. |
| #endif |
| |
| //#ifndef VENDOR_EDIT |
| //Zhou.Zheng@CN.NFC.Basic.Hardware,2674926, 2020/01/21, |
| //Modify for : fix coverity 85484 |
| // if (status == 0) |
| // spi_set_drvdata(spi, st54spi); |
| // else |
| // kfree(st54spi); |
| //#else |
| if (status == 0) { |
| spi_set_drvdata(spi, st54spi); |
| } else { |
| kfree(st54spi); |
| return -ENODEV; |
| } |
| //#endif /* VENDOR_EDIT */ |
| |
| (void)st54spi_parse_dt(&spi->dev, st54spi); |
| |
| if (st54spi->power_or_nreset_gpio != 0) { |
| int default_value = 0; |
| |
| |
| ret = gpio_request(st54spi->power_or_nreset_gpio, |
| #if (!defined(CONFIG_MTK_GPIO) || defined(CONFIG_MTK_GPIOLIB_STAND)) |
| "gpio-power_nreset-std" |
| #else |
| "gpio-power_nreset" |
| #endif |
| ); |
| if (ret) |
| dev_info(&spi->dev, "%s : power request failed (%d)\n", |
| __FILE__, ret); |
| |
| dev_info(&spi->dev, "%s : power/nreset GPIO = %d\n", __func__, |
| st54spi->power_or_nreset_gpio); |
| ret = gpio_direction_output(st54spi->power_or_nreset_gpio, default_value); |
| if (ret) |
| dev_info(&spi->dev, "%s : reset direction_output failed\n", __FILE__); |
| |
| /* active high */ |
| gpio_set_value(st54spi->power_or_nreset_gpio, default_value); |
| } |
| |
| if (st54spi->power_or_nreset_gpio_mode == POWER_MODE_ST54H) { |
| #ifndef MODULE |
| dev_info(&spi->dev, "%s : Register with st21nfc driver, %p\n", |
| __func__, st54spi); |
| st21nfc_register_st54spi_cb(st54spi_st21nfc_cb, st54spi); |
| #else |
| dev_err(&spi->dev, "%s : st54spi as module cannot use ST54H fully\n", |
| __func__); |
| #endif |
| } |
| |
| return status; |
| } |
| |
| static int st54spi_remove(struct spi_device *spi) |
| { |
| struct st54spi_data *st54spi = spi_get_drvdata(spi); |
| |
| if (st54spi->power_or_nreset_gpio_mode == POWER_MODE_ST54H) { |
| #ifndef MODULE |
| dev_info(&st54spi->spi->dev, "%s : Unregister from st21nfc driver\n", |
| __func__); |
| st21nfc_unregister_st54spi_cb(); |
| #endif |
| } |
| /* make sure ops on existing fds can abort cleanly */ |
| spin_lock_irq(&st54spi->spi_lock); |
| st54spi->spi = NULL; |
| st54spi->spi_reset = NULL; |
| spin_unlock_irq(&st54spi->spi_lock); |
| |
| /* prevent new opens */ |
| mutex_lock(&device_list_lock); |
| list_del(&st54spi->device_entry); |
| device_destroy(st54spi_class, st54spi->devt); |
| clear_bit(MINOR(st54spi->devt), minors); |
| if (st54spi->users == 0) |
| kfree(st54spi); |
| |
| mutex_unlock(&device_list_lock); |
| |
| return 0; |
| } |
| |
| static struct spi_driver st54spi_spi_driver = { |
| .driver = { |
| .name = "st54spi", |
| .of_match_table = of_match_ptr(st54spi_dt_ids), |
| .acpi_match_table = ACPI_PTR(st54spi_acpi_ids), |
| }, |
| .probe = st54spi_probe, |
| .remove = st54spi_remove, |
| |
| /* NOTE: suspend/resume methods are not necessary here. |
| * We don't do anything except pass the requests to/from |
| * the underlying controller. The refrigerator handles |
| * most issues; the controller driver handles the rest. |
| */ |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int __init st54spi_init(void) |
| { |
| int status; |
| |
| pr_info("Loading st54spi driver\n"); |
| |
| /* Claim our 256 reserved device numbers. Then register a class |
| * that will key udev/mdev to add/remove /dev nodes. Last, register |
| * the driver which manages those device numbers. |
| */ |
| BUILD_BUG_ON(N_SPI_MINORS > 256); |
| spidev_major = __register_chrdev(0, 0, N_SPI_MINORS, |
| "spi", &st54spi_fops); |
| pr_info("Loading st54spi driver, major: %d\n", spidev_major); |
| |
| st54spi_class = class_create(THIS_MODULE, "spidev"); |
| if (IS_ERR(st54spi_class)) { |
| unregister_chrdev(spidev_major, st54spi_spi_driver.driver.name); |
| return PTR_ERR(st54spi_class); |
| } |
| |
| status = spi_register_driver(&st54spi_spi_driver); |
| if (status < 0) { |
| class_destroy(st54spi_class); |
| unregister_chrdev(spidev_major, st54spi_spi_driver.driver.name); |
| } |
| pr_info("Loading st54spi driver: %d\n", status); |
| return status; |
| } |
| module_init(st54spi_init); |
| |
| static void __exit st54spi_exit(void) |
| { |
| spi_unregister_driver(&st54spi_spi_driver); |
| class_destroy(st54spi_class); |
| unregister_chrdev(spidev_major, st54spi_spi_driver.driver.name); |
| } |
| module_exit(st54spi_exit); |
| |
| MODULE_AUTHOR("Andrea Paterniani, <a.paterniani@swapp-eng.it>"); |
| MODULE_DESCRIPTION("User mode SPI device interface"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("spi:st54spi"); |