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e0626e3844
This makes it consistent with other buses (platform, i2c, vio, ...). I'm not sure why we use the prefixes, but there must be a reason. This was easy enough to do it, and I did it. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Jean Delvare <khali@linux-fr.org> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dmitry Torokhov <dtor@mail.ru> Cc: Samuel Ortiz <sameo@openedhand.com> Cc: "John W. Linville" <linville@tuxdriver.com> Acked-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
929 lines
21 KiB
C
929 lines
21 KiB
C
/*
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*
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* Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*
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* Notes: the MAX3100 doesn't provide an interrupt on CTS so we have
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* to use polling for flow control. TX empty IRQ is unusable, since
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* writing conf clears FIFO buffer and we cannot have this interrupt
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* always asking us for attention.
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*
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* Example platform data:
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static struct plat_max3100 max3100_plat_data = {
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.loopback = 0,
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.crystal = 0,
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.poll_time = 100,
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};
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static struct spi_board_info spi_board_info[] = {
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{
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.modalias = "max3100",
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.platform_data = &max3100_plat_data,
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.irq = IRQ_EINT12,
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.max_speed_hz = 5*1000*1000,
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.chip_select = 0,
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},
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};
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* The initial minor number is 209 in the low-density serial port:
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* mknod /dev/ttyMAX0 c 204 209
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*/
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#define MAX3100_MAJOR 204
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#define MAX3100_MINOR 209
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/* 4 MAX3100s should be enough for everyone */
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#define MAX_MAX3100 4
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/serial_core.h>
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#include <linux/serial.h>
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#include <linux/spi/spi.h>
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#include <linux/freezer.h>
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#include <linux/serial_max3100.h>
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#define MAX3100_C (1<<14)
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#define MAX3100_D (0<<14)
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#define MAX3100_W (1<<15)
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#define MAX3100_RX (0<<15)
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#define MAX3100_WC (MAX3100_W | MAX3100_C)
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#define MAX3100_RC (MAX3100_RX | MAX3100_C)
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#define MAX3100_WD (MAX3100_W | MAX3100_D)
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#define MAX3100_RD (MAX3100_RX | MAX3100_D)
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#define MAX3100_CMD (3 << 14)
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#define MAX3100_T (1<<14)
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#define MAX3100_R (1<<15)
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#define MAX3100_FEN (1<<13)
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#define MAX3100_SHDN (1<<12)
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#define MAX3100_TM (1<<11)
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#define MAX3100_RM (1<<10)
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#define MAX3100_PM (1<<9)
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#define MAX3100_RAM (1<<8)
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#define MAX3100_IR (1<<7)
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#define MAX3100_ST (1<<6)
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#define MAX3100_PE (1<<5)
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#define MAX3100_L (1<<4)
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#define MAX3100_BAUD (0xf)
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#define MAX3100_TE (1<<10)
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#define MAX3100_RAFE (1<<10)
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#define MAX3100_RTS (1<<9)
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#define MAX3100_CTS (1<<9)
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#define MAX3100_PT (1<<8)
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#define MAX3100_DATA (0xff)
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#define MAX3100_RT (MAX3100_R | MAX3100_T)
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#define MAX3100_RTC (MAX3100_RT | MAX3100_CTS | MAX3100_RAFE)
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/* the following simulate a status reg for ignore_status_mask */
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#define MAX3100_STATUS_PE 1
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#define MAX3100_STATUS_FE 2
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#define MAX3100_STATUS_OE 4
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struct max3100_port {
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struct uart_port port;
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struct spi_device *spi;
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int cts; /* last CTS received for flow ctrl */
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int tx_empty; /* last TX empty bit */
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spinlock_t conf_lock; /* shared data */
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int conf_commit; /* need to make changes */
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int conf; /* configuration for the MAX31000
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* (bits 0-7, bits 8-11 are irqs) */
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int rts_commit; /* need to change rts */
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int rts; /* rts status */
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int baud; /* current baud rate */
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int parity; /* keeps track if we should send parity */
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#define MAX3100_PARITY_ON 1
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#define MAX3100_PARITY_ODD 2
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#define MAX3100_7BIT 4
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int rx_enabled; /* if we should rx chars */
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int irq; /* irq assigned to the max3100 */
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int minor; /* minor number */
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int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */
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int loopback; /* 1 if we are in loopback mode */
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/* for handling irqs: need workqueue since we do spi_sync */
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struct workqueue_struct *workqueue;
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struct work_struct work;
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/* set to 1 to make the workhandler exit as soon as possible */
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int force_end_work;
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/* need to know we are suspending to avoid deadlock on workqueue */
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int suspending;
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/* hook for suspending MAX3100 via dedicated pin */
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void (*max3100_hw_suspend) (int suspend);
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/* poll time (in ms) for ctrl lines */
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int poll_time;
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/* and its timer */
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struct timer_list timer;
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};
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static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */
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static DEFINE_MUTEX(max3100s_lock); /* race on probe */
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static int max3100_do_parity(struct max3100_port *s, u16 c)
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{
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int parity;
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if (s->parity & MAX3100_PARITY_ODD)
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parity = 1;
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else
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parity = 0;
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if (s->parity & MAX3100_7BIT)
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c &= 0x7f;
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else
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c &= 0xff;
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parity = parity ^ (hweight8(c) & 1);
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return parity;
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}
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static int max3100_check_parity(struct max3100_port *s, u16 c)
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{
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return max3100_do_parity(s, c) == ((c >> 8) & 1);
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}
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static void max3100_calc_parity(struct max3100_port *s, u16 *c)
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{
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if (s->parity & MAX3100_7BIT)
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*c &= 0x7f;
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else
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*c &= 0xff;
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if (s->parity & MAX3100_PARITY_ON)
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*c |= max3100_do_parity(s, *c) << 8;
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}
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static void max3100_work(struct work_struct *w);
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static void max3100_dowork(struct max3100_port *s)
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{
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if (!s->force_end_work && !work_pending(&s->work) &&
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!freezing(current) && !s->suspending)
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queue_work(s->workqueue, &s->work);
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}
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static void max3100_timeout(unsigned long data)
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{
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struct max3100_port *s = (struct max3100_port *)data;
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if (s->port.state) {
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max3100_dowork(s);
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mod_timer(&s->timer, jiffies + s->poll_time);
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}
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}
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static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx)
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{
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struct spi_message message;
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u16 etx, erx;
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int status;
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struct spi_transfer tran = {
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.tx_buf = &etx,
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.rx_buf = &erx,
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.len = 2,
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};
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etx = cpu_to_be16(tx);
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spi_message_init(&message);
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spi_message_add_tail(&tran, &message);
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status = spi_sync(s->spi, &message);
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if (status) {
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dev_warn(&s->spi->dev, "error while calling spi_sync\n");
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return -EIO;
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}
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*rx = be16_to_cpu(erx);
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s->tx_empty = (*rx & MAX3100_T) > 0;
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dev_dbg(&s->spi->dev, "%04x - %04x\n", tx, *rx);
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return 0;
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}
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static int max3100_handlerx(struct max3100_port *s, u16 rx)
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{
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unsigned int ch, flg, status = 0;
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int ret = 0, cts;
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if (rx & MAX3100_R && s->rx_enabled) {
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff);
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if (rx & MAX3100_RAFE) {
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s->port.icount.frame++;
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flg = TTY_FRAME;
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status |= MAX3100_STATUS_FE;
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} else {
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if (s->parity & MAX3100_PARITY_ON) {
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if (max3100_check_parity(s, rx)) {
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s->port.icount.rx++;
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flg = TTY_NORMAL;
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} else {
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s->port.icount.parity++;
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flg = TTY_PARITY;
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status |= MAX3100_STATUS_PE;
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}
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} else {
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s->port.icount.rx++;
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flg = TTY_NORMAL;
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}
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}
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uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg);
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ret = 1;
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}
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cts = (rx & MAX3100_CTS) > 0;
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if (s->cts != cts) {
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s->cts = cts;
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uart_handle_cts_change(&s->port, cts ? TIOCM_CTS : 0);
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}
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return ret;
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}
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static void max3100_work(struct work_struct *w)
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{
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struct max3100_port *s = container_of(w, struct max3100_port, work);
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int rxchars;
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u16 tx, rx;
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int conf, cconf, rts, crts;
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struct circ_buf *xmit = &s->port.state->xmit;
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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rxchars = 0;
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do {
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spin_lock(&s->conf_lock);
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conf = s->conf;
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cconf = s->conf_commit;
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s->conf_commit = 0;
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rts = s->rts;
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crts = s->rts_commit;
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s->rts_commit = 0;
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spin_unlock(&s->conf_lock);
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if (cconf)
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max3100_sr(s, MAX3100_WC | conf, &rx);
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if (crts) {
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max3100_sr(s, MAX3100_WD | MAX3100_TE |
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(s->rts ? MAX3100_RTS : 0), &rx);
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rxchars += max3100_handlerx(s, rx);
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}
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max3100_sr(s, MAX3100_RD, &rx);
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rxchars += max3100_handlerx(s, rx);
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if (rx & MAX3100_T) {
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tx = 0xffff;
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if (s->port.x_char) {
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tx = s->port.x_char;
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s->port.icount.tx++;
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s->port.x_char = 0;
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} else if (!uart_circ_empty(xmit) &&
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!uart_tx_stopped(&s->port)) {
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tx = xmit->buf[xmit->tail];
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xmit->tail = (xmit->tail + 1) &
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(UART_XMIT_SIZE - 1);
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s->port.icount.tx++;
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}
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if (tx != 0xffff) {
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max3100_calc_parity(s, &tx);
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tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0);
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max3100_sr(s, tx, &rx);
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rxchars += max3100_handlerx(s, rx);
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}
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}
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if (rxchars > 16 && s->port.state->port.tty != NULL) {
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tty_flip_buffer_push(s->port.state->port.tty);
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rxchars = 0;
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}
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&s->port);
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} while (!s->force_end_work &&
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!freezing(current) &&
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((rx & MAX3100_R) ||
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(!uart_circ_empty(xmit) &&
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!uart_tx_stopped(&s->port))));
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if (rxchars > 0 && s->port.state->port.tty != NULL)
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tty_flip_buffer_push(s->port.state->port.tty);
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}
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static irqreturn_t max3100_irq(int irqno, void *dev_id)
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{
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struct max3100_port *s = dev_id;
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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max3100_dowork(s);
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return IRQ_HANDLED;
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}
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static void max3100_enable_ms(struct uart_port *port)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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if (s->poll_time > 0)
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mod_timer(&s->timer, jiffies);
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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}
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static void max3100_start_tx(struct uart_port *port)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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max3100_dowork(s);
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}
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static void max3100_stop_rx(struct uart_port *port)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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s->rx_enabled = 0;
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spin_lock(&s->conf_lock);
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s->conf &= ~MAX3100_RM;
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s->conf_commit = 1;
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spin_unlock(&s->conf_lock);
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max3100_dowork(s);
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}
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static unsigned int max3100_tx_empty(struct uart_port *port)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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/* may not be truly up-to-date */
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max3100_dowork(s);
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return s->tx_empty;
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}
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static unsigned int max3100_get_mctrl(struct uart_port *port)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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/* may not be truly up-to-date */
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max3100_dowork(s);
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/* always assert DCD and DSR since these lines are not wired */
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return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR;
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}
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static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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int rts;
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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rts = (mctrl & TIOCM_RTS) > 0;
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spin_lock(&s->conf_lock);
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if (s->rts != rts) {
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s->rts = rts;
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s->rts_commit = 1;
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max3100_dowork(s);
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}
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spin_unlock(&s->conf_lock);
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}
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static void
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max3100_set_termios(struct uart_port *port, struct ktermios *termios,
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struct ktermios *old)
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{
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struct max3100_port *s = container_of(port,
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struct max3100_port,
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port);
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int baud = 0;
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unsigned cflag;
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u32 param_new, param_mask, parity = 0;
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struct tty_struct *tty = s->port.state->port.tty;
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dev_dbg(&s->spi->dev, "%s\n", __func__);
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if (!tty)
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return;
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cflag = termios->c_cflag;
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param_new = 0;
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param_mask = 0;
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baud = tty_get_baud_rate(tty);
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param_new = s->conf & MAX3100_BAUD;
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switch (baud) {
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case 300:
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if (s->crystal)
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baud = s->baud;
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else
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param_new = 15;
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break;
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case 600:
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param_new = 14 + s->crystal;
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break;
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case 1200:
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param_new = 13 + s->crystal;
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break;
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case 2400:
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param_new = 12 + s->crystal;
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break;
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case 4800:
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param_new = 11 + s->crystal;
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break;
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case 9600:
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param_new = 10 + s->crystal;
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break;
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case 19200:
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param_new = 9 + s->crystal;
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break;
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case 38400:
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param_new = 8 + s->crystal;
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break;
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case 57600:
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param_new = 1 + s->crystal;
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break;
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case 115200:
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param_new = 0 + s->crystal;
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break;
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case 230400:
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if (s->crystal)
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param_new = 0;
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else
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baud = s->baud;
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break;
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default:
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baud = s->baud;
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}
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tty_encode_baud_rate(tty, baud, baud);
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s->baud = baud;
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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;
|
|
|
|
/* we are sending char from a workqueue so enable */
|
|
s->port.state->port.tty->low_latency = 1;
|
|
|
|
if (s->poll_time > 0)
|
|
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 = container_of(port,
|
|
struct max3100_port,
|
|
port);
|
|
|
|
dev_dbg(&s->spi->dev, "%s\n", __func__);
|
|
|
|
if (s->suspending)
|
|
return;
|
|
|
|
s->force_end_work = 1;
|
|
|
|
if (s->poll_time > 0)
|
|
del_timer_sync(&s->timer);
|
|
|
|
if (s->workqueue) {
|
|
flush_workqueue(s->workqueue);
|
|
destroy_workqueue(s->workqueue);
|
|
s->workqueue = NULL;
|
|
}
|
|
if (s->irq)
|
|
free_irq(s->irq, s);
|
|
|
|
/* set shutdown mode to save power */
|
|
if (s->max3100_hw_suspend)
|
|
s->max3100_hw_suspend(1);
|
|
else {
|
|
u16 tx, rx;
|
|
|
|
tx = MAX3100_WC | MAX3100_SHDN;
|
|
max3100_sr(s, tx, &rx);
|
|
}
|
|
}
|
|
|
|
static int max3100_startup(struct uart_port *port)
|
|
{
|
|
struct max3100_port *s = container_of(port,
|
|
struct max3100_port,
|
|
port);
|
|
char b[12];
|
|
|
|
dev_dbg(&s->spi->dev, "%s\n", __func__);
|
|
|
|
s->conf = MAX3100_RM;
|
|
s->baud = s->crystal ? 230400 : 115200;
|
|
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_freezeable_workqueue(b);
|
|
if (!s->workqueue) {
|
|
dev_warn(&s->spi->dev, "cannot create workqueue\n");
|
|
return -EBUSY;
|
|
}
|
|
INIT_WORK(&s->work, max3100_work);
|
|
|
|
if (request_irq(s->irq, max3100_irq,
|
|
IRQF_TRIGGER_FALLING, "max3100", s) < 0) {
|
|
dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq);
|
|
s->irq = 0;
|
|
destroy_workqueue(s->workqueue);
|
|
s->workqueue = NULL;
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (s->loopback) {
|
|
u16 tx, rx;
|
|
tx = 0x4001;
|
|
max3100_sr(s, tx, &rx);
|
|
}
|
|
|
|
if (s->max3100_hw_suspend)
|
|
s->max3100_hw_suspend(0);
|
|
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 = container_of(port,
|
|
struct 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 = container_of(port,
|
|
struct 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 = container_of(port,
|
|
struct 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 = container_of(port,
|
|
struct 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 = container_of(port,
|
|
struct max3100_port,
|
|
port);
|
|
|
|
dev_dbg(&s->spi->dev, "%s\n", __func__);
|
|
}
|
|
|
|
static int max3100_request_port(struct uart_port *port)
|
|
{
|
|
struct max3100_port *s = container_of(port,
|
|
struct 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 = container_of(port,
|
|
struct max3100_port,
|
|
port);
|
|
|
|
dev_dbg(&s->spi->dev, "%s\n", __func__);
|
|
}
|
|
|
|
static 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 __devinit max3100_probe(struct spi_device *spi)
|
|
{
|
|
int i, retval;
|
|
struct plat_max3100 *pdata;
|
|
u16 tx, rx;
|
|
|
|
mutex_lock(&max3100s_lock);
|
|
|
|
if (!uart_driver_registered) {
|
|
uart_driver_registered = 1;
|
|
retval = uart_register_driver(&max3100_uart_driver);
|
|
if (retval) {
|
|
printk(KERN_ERR "Couldn't register max3100 uart driver\n");
|
|
mutex_unlock(&max3100s_lock);
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < MAX_MAX3100; i++)
|
|
if (!max3100s[i])
|
|
break;
|
|
if (i == MAX_MAX3100) {
|
|
dev_warn(&spi->dev, "too many MAX3100 chips\n");
|
|
mutex_unlock(&max3100s_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL);
|
|
if (!max3100s[i]) {
|
|
dev_warn(&spi->dev,
|
|
"kmalloc for max3100 structure %d failed!\n", i);
|
|
mutex_unlock(&max3100s_lock);
|
|
return -ENOMEM;
|
|
}
|
|
max3100s[i]->spi = spi;
|
|
max3100s[i]->irq = spi->irq;
|
|
spin_lock_init(&max3100s[i]->conf_lock);
|
|
dev_set_drvdata(&spi->dev, max3100s[i]);
|
|
pdata = spi->dev.platform_data;
|
|
max3100s[i]->crystal = pdata->crystal;
|
|
max3100s[i]->loopback = pdata->loopback;
|
|
max3100s[i]->poll_time = pdata->poll_time * HZ / 1000;
|
|
if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0)
|
|
max3100s[i]->poll_time = 1;
|
|
max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend;
|
|
max3100s[i]->minor = i;
|
|
init_timer(&max3100s[i]->timer);
|
|
max3100s[i]->timer.function = max3100_timeout;
|
|
max3100s[i]->timer.data = (unsigned long) max3100s[i];
|
|
|
|
dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i);
|
|
max3100s[i]->port.irq = max3100s[i]->irq;
|
|
max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200;
|
|
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;
|
|
retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port);
|
|
if (retval < 0)
|
|
dev_warn(&spi->dev,
|
|
"uart_add_one_port failed for line %d with error %d\n",
|
|
i, retval);
|
|
|
|
/* set shutdown mode to save power. Will be woken-up on open */
|
|
if (max3100s[i]->max3100_hw_suspend)
|
|
max3100s[i]->max3100_hw_suspend(1);
|
|
else {
|
|
tx = MAX3100_WC | MAX3100_SHDN;
|
|
max3100_sr(max3100s[i], tx, &rx);
|
|
}
|
|
mutex_unlock(&max3100s_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit max3100_remove(struct spi_device *spi)
|
|
{
|
|
struct max3100_port *s = dev_get_drvdata(&spi->dev);
|
|
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)
|
|
break;
|
|
|
|
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;
|
|
|
|
/* check if this is the last chip we have */
|
|
for (i = 0; i < MAX_MAX3100; i++)
|
|
if (max3100s[i]) {
|
|
mutex_unlock(&max3100s_lock);
|
|
return 0;
|
|
}
|
|
pr_debug("removing max3100 driver\n");
|
|
uart_unregister_driver(&max3100_uart_driver);
|
|
|
|
mutex_unlock(&max3100s_lock);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int max3100_suspend(struct spi_device *spi, pm_message_t state)
|
|
{
|
|
struct max3100_port *s = dev_get_drvdata(&spi->dev);
|
|
|
|
dev_dbg(&s->spi->dev, "%s\n", __func__);
|
|
|
|
disable_irq(s->irq);
|
|
|
|
s->suspending = 1;
|
|
uart_suspend_port(&max3100_uart_driver, &s->port);
|
|
|
|
if (s->max3100_hw_suspend)
|
|
s->max3100_hw_suspend(1);
|
|
else {
|
|
/* no HW suspend, so do SW one */
|
|
u16 tx, rx;
|
|
|
|
tx = MAX3100_WC | MAX3100_SHDN;
|
|
max3100_sr(s, tx, &rx);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int max3100_resume(struct spi_device *spi)
|
|
{
|
|
struct max3100_port *s = dev_get_drvdata(&spi->dev);
|
|
|
|
dev_dbg(&s->spi->dev, "%s\n", __func__);
|
|
|
|
if (s->max3100_hw_suspend)
|
|
s->max3100_hw_suspend(0);
|
|
uart_resume_port(&max3100_uart_driver, &s->port);
|
|
s->suspending = 0;
|
|
|
|
enable_irq(s->irq);
|
|
|
|
s->conf_commit = 1;
|
|
if (s->workqueue)
|
|
max3100_dowork(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
#define max3100_suspend NULL
|
|
#define max3100_resume NULL
|
|
#endif
|
|
|
|
static struct spi_driver max3100_driver = {
|
|
.driver = {
|
|
.name = "max3100",
|
|
.bus = &spi_bus_type,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
|
|
.probe = max3100_probe,
|
|
.remove = __devexit_p(max3100_remove),
|
|
.suspend = max3100_suspend,
|
|
.resume = max3100_resume,
|
|
};
|
|
|
|
static int __init max3100_init(void)
|
|
{
|
|
return spi_register_driver(&max3100_driver);
|
|
}
|
|
module_init(max3100_init);
|
|
|
|
static void __exit max3100_exit(void)
|
|
{
|
|
spi_unregister_driver(&max3100_driver);
|
|
}
|
|
module_exit(max3100_exit);
|
|
|
|
MODULE_DESCRIPTION("MAX3100 driver");
|
|
MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("spi:max3100");
|