| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Alan Cox | 3567 | 87.99% | 4 | 9.30% |
| Andy Shevchenko | 391 | 9.64% | 15 | 34.88% |
| Jiri Slaby (SUSE) | 26 | 0.64% | 2 | 4.65% |
| Lars-Peter Clausen | 15 | 0.37% | 1 | 2.33% |
| Kees Cook | 14 | 0.35% | 1 | 2.33% |
| Jiri Slaby | 10 | 0.25% | 4 | 9.30% |
| David S. Miller | 5 | 0.12% | 1 | 2.33% |
| Ilpo Järvinen | 4 | 0.10% | 2 | 4.65% |
| Paul Gortmaker | 3 | 0.07% | 1 | 2.33% |
| Timur Tabi | 3 | 0.07% | 1 | 2.33% |
| Allen Pais | 3 | 0.07% | 1 | 2.33% |
| Tejun Heo | 3 | 0.07% | 2 | 4.65% |
| Jingoo Han | 2 | 0.05% | 1 | 2.33% |
| Uwe Kleine-König | 2 | 0.05% | 1 | 2.33% |
| Linus Torvalds (pre-git) | 2 | 0.05% | 2 | 4.65% |
| Julia Lawall | 1 | 0.02% | 1 | 2.33% |
| Devendra Naga | 1 | 0.02% | 1 | 2.33% |
| Stephen Rothwell | 1 | 0.02% | 1 | 2.33% |
| Greg Kroah-Hartman | 1 | 0.02% | 1 | 2.33% |
| Total | 4054 | 43 |
// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org> * * Notes: the MAX3100 doesn't provide an interrupt on CTS so we have * to use polling for flow control. TX empty IRQ is unusable, since * writing conf clears FIFO buffer and we cannot have this interrupt * always asking us for attention. * * The initial minor number is 209 in the low-density serial port: * mknod /dev/ttyMAX0 c 204 209 */ #define MAX3100_MAJOR 204 #define MAX3100_MINOR 209 /* 4 MAX3100s should be enough for everyone */ #define MAX_MAX3100 4 #include <linux/container_of.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/freezer.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/pm.h> #include <linux/property.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include <linux/tty_flip.h> #include <linux/tty.h> #include <linux/types.h> #include <asm/unaligned.h> #define MAX3100_C (1<<14) #define MAX3100_D (0<<14) #define MAX3100_W (1<<15) #define MAX3100_RX (0<<15) #define MAX3100_WC (MAX3100_W | MAX3100_C) #define MAX3100_RC (MAX3100_RX | MAX3100_C) #define MAX3100_WD (MAX3100_W | MAX3100_D) #define MAX3100_RD (MAX3100_RX | MAX3100_D) #define MAX3100_CMD (3 << 14) #define MAX3100_T (1<<14) #define MAX3100_R (1<<15) #define MAX3100_FEN (1<<13) #define MAX3100_SHDN (1<<12) #define MAX3100_TM (1<<11) #define MAX3100_RM (1<<10) #define MAX3100_PM (1<<9) #define MAX3100_RAM (1<<8) #define MAX3100_IR (1<<7) #define MAX3100_ST (1<<6) #define MAX3100_PE (1<<5) #define MAX3100_L (1<<4) #define MAX3100_BAUD (0xf) #define MAX3100_TE (1<<10) #define MAX3100_RAFE (1<<10) #define MAX3100_RTS (1<<9) #define MAX3100_CTS (1<<9) #define MAX3100_PT (1<<8) #define MAX3100_DATA (0xff) #define MAX3100_RT (MAX3100_R | MAX3100_T) #define MAX3100_RTC (MAX3100_RT | MAX3100_CTS | MAX3100_RAFE) /* the following simulate a status reg for ignore_status_mask */ #define MAX3100_STATUS_PE 1 #define MAX3100_STATUS_FE 2 #define MAX3100_STATUS_OE 4 struct max3100_port { struct uart_port port; struct spi_device *spi; int cts; /* last CTS received for flow ctrl */ int tx_empty; /* last TX empty bit */ spinlock_t conf_lock; /* shared data */ int conf_commit; /* need to make changes */ int conf; /* configuration for the MAX31000 * (bits 0-7, bits 8-11 are irqs) */ int rts_commit; /* need to change rts */ int rts; /* rts status */ int baud; /* current baud rate */ int parity; /* keeps track if we should send parity */ #define MAX3100_PARITY_ON 1 #define MAX3100_PARITY_ODD 2 #define MAX3100_7BIT 4 int rx_enabled; /* if we should rx chars */ int minor; /* minor number */ int loopback_commit; /* need to change loopback */ int loopback; /* 1 if we are in loopback mode */ /* for handling irqs: need workqueue since we do spi_sync */ struct workqueue_struct *workqueue; struct work_struct work; /* set to 1 to make the workhandler exit as soon as possible */ int force_end_work; /* need to know we are suspending to avoid deadlock on workqueue */ int suspending; struct timer_list timer; }; static inline struct max3100_port *to_max3100_port(struct uart_port *port) { return container_of(port, struct max3100_port, port); } static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */ static DEFINE_MUTEX(max3100s_lock); /* race on probe */ static int max3100_do_parity(struct max3100_port *s, u16 c) { int parity; if (s->parity & MAX3100_PARITY_ODD) parity = 1; else parity = 0; if (s->parity & MAX3100_7BIT) c &= 0x7f; else c &= 0xff; parity = parity ^ (hweight8(c) & 1); return parity; } static int max3100_check_parity(struct max3100_port *s, u16 c) { return max3100_do_parity(s, c) == ((c >> 8) & 1); } static void max3100_calc_parity(struct max3100_port *s, u16 *c) { if (s->parity & MAX3100_7BIT) *c &= 0x7f; else *c &= 0xff; if (s->parity & MAX3100_PARITY_ON) *c |= max3100_do_parity(s, *c) << 8; } static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) { struct spi_message message; __be16 etx, erx; int status; struct spi_transfer tran = { .tx_buf = &etx, .rx_buf = &erx, .len = 2, }; etx = cpu_to_be16(tx); spi_message_init(&message); spi_message_add_tail(&tran, &message); status = spi_sync(s->spi, &message); if (status) { dev_warn(&s->spi->dev, "error while calling spi_sync\n"); return -EIO; } *rx = be16_to_cpu(erx); s->tx_empty = (*rx & MAX3100_T) > 0; dev_dbg(&s->spi->dev, "%04x - %04x\n", tx, *rx); return 0; } static int max3100_handlerx_unlocked(struct max3100_port *s, u16 rx) { unsigned int status = 0; int ret = 0, cts; u8 ch, flg; if (rx & MAX3100_R && s->rx_enabled) { dev_dbg(&s->spi->dev, "%s\n", __func__); ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff); if (rx & MAX3100_RAFE) { s->port.icount.frame++; flg = TTY_FRAME; status |= MAX3100_STATUS_FE; } else { if (s->parity & MAX3100_PARITY_ON) { if (max3100_check_parity(s, rx)) { s->port.icount.rx++; flg = TTY_NORMAL; } else { s->port.icount.parity++; flg = TTY_PARITY; status |= MAX3100_STATUS_PE; } } else { s->port.icount.rx++; flg = TTY_NORMAL; } } uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg); ret = 1; } cts = (rx & MAX3100_CTS) > 0; if (s->cts != cts) { s->cts = cts; uart_handle_cts_change(&s->port, cts); } return ret; } static int max3100_handlerx(struct max3100_port *s, u16 rx) { unsigned long flags; int ret; uart_port_lock_irqsave(&s->port, &flags); ret = max3100_handlerx_unlocked(s, rx); uart_port_unlock_irqrestore(&s->port, flags); return ret; } static void max3100_work(struct work_struct *w) { struct max3100_port *s = container_of(w, struct max3100_port, work); struct tty_port *tport = &s->port.state->port; unsigned char ch; int conf, cconf, cloopback, crts; int rxchars; u16 tx, rx; dev_dbg(&s->spi->dev, "%s\n", __func__); rxchars = 0; do { spin_lock(&s->conf_lock); conf = s->conf; cconf = s->conf_commit; s->conf_commit = 0; cloopback = s->loopback_commit; s->loopback_commit = 0; crts = s->rts_commit; s->rts_commit = 0; spin_unlock(&s->conf_lock); if (cconf) max3100_sr(s, MAX3100_WC | conf, &rx); if (cloopback) max3100_sr(s, 0x4001, &rx); if (crts) { max3100_sr(s, MAX3100_WD | MAX3100_TE | (s->rts ? MAX3100_RTS : 0), &rx); rxchars += max3100_handlerx(s, rx); } max3100_sr(s, MAX3100_RD, &rx); rxchars += max3100_handlerx(s, rx); if (rx & MAX3100_T) { tx = 0xffff; if (s->port.x_char) { tx = s->port.x_char; s->port.icount.tx++; s->port.x_char = 0; } else if (!uart_tx_stopped(&s->port) && uart_fifo_get(&s->port, &ch)) { tx = ch; } if (tx != 0xffff) { max3100_calc_parity(s, &tx); tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0); max3100_sr(s, tx, &rx); rxchars += max3100_handlerx(s, rx); } } if (rxchars > 16) { tty_flip_buffer_push(&s->port.state->port); rxchars = 0; } if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&s->port); } while (!s->force_end_work && !freezing(current) && ((rx & MAX3100_R) || (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(&s->port)))); if (rxchars > 0) tty_flip_buffer_push(&s->port.state->port); } static void max3100_dowork(struct max3100_port *s) { if (!s->force_end_work && !freezing(current) && !s->suspending) queue_work(s->workqueue, &s->work); } static void max3100_timeout(struct timer_list *t) { struct max3100_port *s = from_timer(s, t, timer); max3100_dowork(s); mod_timer(&s->timer, jiffies + uart_poll_timeout(&s->port)); } static irqreturn_t max3100_irq(int irqno, void *dev_id) { struct max3100_port *s = dev_id; dev_dbg(&s->spi->dev, "%s\n", __func__); max3100_dowork(s); return IRQ_HANDLED; } static void max3100_enable_ms(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); mod_timer(&s->timer, jiffies); dev_dbg(&s->spi->dev, "%s\n", __func__); } static void max3100_start_tx(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); max3100_dowork(s); } static void max3100_stop_rx(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); s->rx_enabled = 0; spin_lock(&s->conf_lock); s->conf &= ~MAX3100_RM; s->conf_commit = 1; spin_unlock(&s->conf_lock); max3100_dowork(s); } static unsigned int max3100_tx_empty(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); /* may not be truly up-to-date */ max3100_dowork(s); return s->tx_empty; } static unsigned int max3100_get_mctrl(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); /* may not be truly up-to-date */ max3100_dowork(s); /* always assert DCD and DSR since these lines are not wired */ return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR; } static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct max3100_port *s = to_max3100_port(port); int loopback, rts; dev_dbg(&s->spi->dev, "%s\n", __func__); loopback = (mctrl & TIOCM_LOOP) > 0; rts = (mctrl & TIOCM_RTS) > 0; spin_lock(&s->conf_lock); if (s->loopback != loopback) { s->loopback = loopback; s->loopback_commit = 1; } if (s->rts != rts) { s->rts = rts; s->rts_commit = 1; } if (s->loopback_commit || s->rts_commit) max3100_dowork(s); spin_unlock(&s->conf_lock); } static void max3100_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { struct max3100_port *s = to_max3100_port(port); unsigned int baud = port->uartclk / 16; unsigned int baud230400 = (baud == 230400) ? 1 : 0; unsigned cflag; u32 param_new, param_mask, parity = 0; dev_dbg(&s->spi->dev, "%s\n", __func__); cflag = termios->c_cflag; param_mask = 0; baud = tty_termios_baud_rate(termios); param_new = s->conf & MAX3100_BAUD; switch (baud) { case 300: if (baud230400) baud = s->baud; else param_new = 15; break; case 600: param_new = 14 + baud230400; break; case 1200: param_new = 13 + baud230400; break; case 2400: param_new = 12 + baud230400; break; case 4800: param_new = 11 + baud230400; break; case 9600: param_new = 10 + baud230400; break; case 19200: param_new = 9 + baud230400; break; case 38400: param_new = 8 + baud230400; break; case 57600: param_new = 1 + baud230400; break; case 115200: param_new = 0 + baud230400; break; case 230400: if (baud230400) param_new = 0; else baud = s->baud; break; default: baud = s->baud; } tty_termios_encode_baud_rate(termios, baud, baud); s->baud = baud; param_mask |= MAX3100_BAUD; if ((cflag & CSIZE) == CS8) { param_new &= ~MAX3100_L; parity &= ~MAX3100_7BIT; } else { param_new |= MAX3100_L; parity |= MAX3100_7BIT; cflag = (cflag & ~CSIZE) | CS7; } param_mask |= MAX3100_L; if (cflag & CSTOPB) param_new |= MAX3100_ST; else param_new &= ~MAX3100_ST; param_mask |= MAX3100_ST; if (cflag & PARENB) { param_new |= MAX3100_PE; parity |= MAX3100_PARITY_ON; } else { param_new &= ~MAX3100_PE; parity &= ~MAX3100_PARITY_ON; } param_mask |= MAX3100_PE; if (cflag & PARODD) parity |= MAX3100_PARITY_ODD; else parity &= ~MAX3100_PARITY_ODD; /* mask termios capabilities we don't support */ cflag &= ~CMSPAR; termios->c_cflag = cflag; s->port.ignore_status_mask = 0; if (termios->c_iflag & IGNPAR) s->port.ignore_status_mask |= MAX3100_STATUS_PE | MAX3100_STATUS_FE | MAX3100_STATUS_OE; del_timer_sync(&s->timer); uart_update_timeout(port, termios->c_cflag, baud); spin_lock(&s->conf_lock); s->conf = (s->conf & ~param_mask) | (param_new & param_mask); s->conf_commit = 1; s->parity = parity; spin_unlock(&s->conf_lock); max3100_dowork(s); if (UART_ENABLE_MS(&s->port, termios->c_cflag)) max3100_enable_ms(&s->port); } static void max3100_shutdown(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); u16 rx; dev_dbg(&s->spi->dev, "%s\n", __func__); if (s->suspending) return; s->force_end_work = 1; del_timer_sync(&s->timer); if (s->workqueue) { destroy_workqueue(s->workqueue); s->workqueue = NULL; } if (port->irq) free_irq(port->irq, s); /* set shutdown mode to save power */ max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx); } static int max3100_startup(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); char b[12]; int ret; dev_dbg(&s->spi->dev, "%s\n", __func__); s->conf = MAX3100_RM; s->baud = port->uartclk / 16; s->rx_enabled = 1; if (s->suspending) return 0; s->force_end_work = 0; s->parity = 0; s->rts = 0; sprintf(b, "max3100-%d", s->minor); s->workqueue = create_freezable_workqueue(b); if (!s->workqueue) { dev_warn(&s->spi->dev, "cannot create workqueue\n"); return -EBUSY; } INIT_WORK(&s->work, max3100_work); ret = request_irq(port->irq, max3100_irq, IRQF_TRIGGER_FALLING, "max3100", s); if (ret < 0) { dev_warn(&s->spi->dev, "cannot allocate irq %d\n", port->irq); port->irq = 0; destroy_workqueue(s->workqueue); s->workqueue = NULL; return -EBUSY; } s->conf_commit = 1; max3100_dowork(s); /* wait for clock to settle */ msleep(50); max3100_enable_ms(&s->port); return 0; } static const char *max3100_type(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; } static void max3100_release_port(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); } static void max3100_config_port(struct uart_port *port, int flags) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); if (flags & UART_CONFIG_TYPE) s->port.type = PORT_MAX3100; } static int max3100_verify_port(struct uart_port *port, struct serial_struct *ser) { struct max3100_port *s = to_max3100_port(port); int ret = -EINVAL; dev_dbg(&s->spi->dev, "%s\n", __func__); if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) ret = 0; return ret; } static void max3100_stop_tx(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); } static int max3100_request_port(struct uart_port *port) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); return 0; } static void max3100_break_ctl(struct uart_port *port, int break_state) { struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); } static const struct uart_ops max3100_ops = { .tx_empty = max3100_tx_empty, .set_mctrl = max3100_set_mctrl, .get_mctrl = max3100_get_mctrl, .stop_tx = max3100_stop_tx, .start_tx = max3100_start_tx, .stop_rx = max3100_stop_rx, .enable_ms = max3100_enable_ms, .break_ctl = max3100_break_ctl, .startup = max3100_startup, .shutdown = max3100_shutdown, .set_termios = max3100_set_termios, .type = max3100_type, .release_port = max3100_release_port, .request_port = max3100_request_port, .config_port = max3100_config_port, .verify_port = max3100_verify_port, }; static struct uart_driver max3100_uart_driver = { .owner = THIS_MODULE, .driver_name = "ttyMAX", .dev_name = "ttyMAX", .major = MAX3100_MAJOR, .minor = MAX3100_MINOR, .nr = MAX_MAX3100, }; static int uart_driver_registered; static int max3100_probe(struct spi_device *spi) { struct device *dev = &spi->dev; int i, retval; u16 rx; mutex_lock(&max3100s_lock); if (!uart_driver_registered) { retval = uart_register_driver(&max3100_uart_driver); if (retval) { mutex_unlock(&max3100s_lock); return dev_err_probe(dev, retval, "Couldn't register max3100 uart driver\n"); } uart_driver_registered = 1; } for (i = 0; i < MAX_MAX3100; i++) if (!max3100s[i]) break; if (i == MAX_MAX3100) { mutex_unlock(&max3100s_lock); return dev_err_probe(dev, -ENOMEM, "too many MAX3100 chips\n"); } max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); if (!max3100s[i]) { mutex_unlock(&max3100s_lock); return -ENOMEM; } max3100s[i]->spi = spi; spin_lock_init(&max3100s[i]->conf_lock); spi_set_drvdata(spi, max3100s[i]); max3100s[i]->minor = i; timer_setup(&max3100s[i]->timer, max3100_timeout, 0); dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); max3100s[i]->port.irq = spi->irq; max3100s[i]->port.fifosize = 16; max3100s[i]->port.ops = &max3100_ops; max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; max3100s[i]->port.line = i; max3100s[i]->port.type = PORT_MAX3100; max3100s[i]->port.dev = &spi->dev; /* Read clock frequency from a property, uart_add_one_port() will fail if it's not set */ device_property_read_u32(dev, "clock-frequency", &max3100s[i]->port.uartclk); retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); if (retval < 0) dev_err_probe(dev, retval, "uart_add_one_port failed for line %d\n", i); /* set shutdown mode to save power. Will be woken-up on open */ max3100_sr(max3100s[i], MAX3100_WC | MAX3100_SHDN, &rx); mutex_unlock(&max3100s_lock); return 0; } static void max3100_remove(struct spi_device *spi) { struct max3100_port *s = spi_get_drvdata(spi); int i; mutex_lock(&max3100s_lock); /* find out the index for the chip we are removing */ for (i = 0; i < MAX_MAX3100; i++) if (max3100s[i] == s) { dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); kfree(max3100s[i]); max3100s[i] = NULL; break; } WARN_ON(i == MAX_MAX3100); /* check if this is the last chip we have */ for (i = 0; i < MAX_MAX3100; i++) if (max3100s[i]) { mutex_unlock(&max3100s_lock); return; } pr_debug("removing max3100 driver\n"); uart_unregister_driver(&max3100_uart_driver); uart_driver_registered = 0; mutex_unlock(&max3100s_lock); } static int max3100_suspend(struct device *dev) { struct max3100_port *s = dev_get_drvdata(dev); u16 rx; dev_dbg(&s->spi->dev, "%s\n", __func__); disable_irq(s->port.irq); s->suspending = 1; uart_suspend_port(&max3100_uart_driver, &s->port); /* no HW suspend, so do SW one */ max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx); return 0; } static int max3100_resume(struct device *dev) { struct max3100_port *s = dev_get_drvdata(dev); dev_dbg(&s->spi->dev, "%s\n", __func__); uart_resume_port(&max3100_uart_driver, &s->port); s->suspending = 0; enable_irq(s->port.irq); s->conf_commit = 1; if (s->workqueue) max3100_dowork(s); return 0; } static DEFINE_SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); static const struct spi_device_id max3100_spi_id[] = { { "max3100" }, { } }; MODULE_DEVICE_TABLE(spi, max3100_spi_id); static const struct of_device_id max3100_of_match[] = { { .compatible = "maxim,max3100" }, { } }; MODULE_DEVICE_TABLE(of, max3100_of_match); static struct spi_driver max3100_driver = { .driver = { .name = "max3100", .of_match_table = max3100_of_match, .pm = pm_sleep_ptr(&max3100_pm_ops), }, .probe = max3100_probe, .remove = max3100_remove, .id_table = max3100_spi_id, }; module_spi_driver(max3100_driver); MODULE_DESCRIPTION("MAX3100 driver"); MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); MODULE_LICENSE("GPL");
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