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906 lines
20 KiB
906 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* |
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* Copyright (C) 2008 Christian Pellegrin <[email protected]> |
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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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|
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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/slab.h> |
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#include <linux/device.h> |
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#include <linux/module.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/tty.h> |
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#include <linux/tty_flip.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 && !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(struct timer_list *t) |
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{ |
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struct max3100_port *s = from_timer(s, t, timer); |
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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, 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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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) { |
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tty_flip_buffer_push(&s->port.state->port); |
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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) |
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tty_flip_buffer_push(&s->port.state->port); |
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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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dev_dbg(&s->spi->dev, "%s\n", __func__); |
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cflag = termios->c_cflag; |
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param_mask = 0; |
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baud = tty_termios_baud_rate(termios); |
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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_termios_encode_baud_rate(termios, baud, baud); |
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s->baud = baud; |
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param_mask |= MAX3100_BAUD; |
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if ((cflag & CSIZE) == CS8) { |
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param_new &= ~MAX3100_L; |
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parity &= ~MAX3100_7BIT; |
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} else { |
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param_new |= MAX3100_L; |
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parity |= MAX3100_7BIT; |
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cflag = (cflag & ~CSIZE) | CS7; |
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} |
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param_mask |= MAX3100_L; |
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if (cflag & CSTOPB) |
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param_new |= MAX3100_ST; |
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else |
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param_new &= ~MAX3100_ST; |
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param_mask |= MAX3100_ST; |
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if (cflag & PARENB) { |
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param_new |= MAX3100_PE; |
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parity |= MAX3100_PARITY_ON; |
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} else { |
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param_new &= ~MAX3100_PE; |
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parity &= ~MAX3100_PARITY_ON; |
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} |
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param_mask |= MAX3100_PE; |
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if (cflag & PARODD) |
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parity |= MAX3100_PARITY_ODD; |
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else |
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parity &= ~MAX3100_PARITY_ODD; |
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/* mask termios capabilities we don't support */ |
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cflag &= ~CMSPAR; |
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termios->c_cflag = cflag; |
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s->port.ignore_status_mask = 0; |
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if (termios->c_iflag & IGNPAR) |
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s->port.ignore_status_mask |= |
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MAX3100_STATUS_PE | MAX3100_STATUS_FE | |
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MAX3100_STATUS_OE; |
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if (s->poll_time > 0) |
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del_timer_sync(&s->timer); |
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uart_update_timeout(port, termios->c_cflag, baud); |
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spin_lock(&s->conf_lock); |
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s->conf = (s->conf & ~param_mask) | (param_new & param_mask); |
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s->conf_commit = 1; |
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s->parity = parity; |
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spin_unlock(&s->conf_lock); |
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max3100_dowork(s); |
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|
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if (UART_ENABLE_MS(&s->port, termios->c_cflag)) |
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max3100_enable_ms(&s->port); |
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} |
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static void max3100_shutdown(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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if (s->suspending) |
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return; |
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s->force_end_work = 1; |
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if (s->poll_time > 0) |
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del_timer_sync(&s->timer); |
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if (s->workqueue) { |
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flush_workqueue(s->workqueue); |
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destroy_workqueue(s->workqueue); |
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s->workqueue = NULL; |
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} |
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if (s->irq) |
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free_irq(s->irq, s); |
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|
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/* set shutdown mode to save power */ |
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if (s->max3100_hw_suspend) |
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s->max3100_hw_suspend(1); |
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else { |
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u16 tx, rx; |
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tx = MAX3100_WC | MAX3100_SHDN; |
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max3100_sr(s, tx, &rx); |
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} |
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} |
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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_freezable_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 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) |
|
{ |
|
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); |
|
spi_set_drvdata(spi, max3100s[i]); |
|
pdata = dev_get_platdata(&spi->dev); |
|
max3100s[i]->crystal = pdata->crystal; |
|
max3100s[i]->loopback = pdata->loopback; |
|
max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); |
|
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; |
|
timer_setup(&max3100s[i]->timer, max3100_timeout, 0); |
|
|
|
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 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 0; |
|
} |
|
pr_debug("removing max3100 driver\n"); |
|
uart_unregister_driver(&max3100_uart_driver); |
|
|
|
mutex_unlock(&max3100s_lock); |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
|
|
static int max3100_suspend(struct device *dev) |
|
{ |
|
struct max3100_port *s = dev_get_drvdata(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 device *dev) |
|
{ |
|
struct max3100_port *s = dev_get_drvdata(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; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); |
|
#define MAX3100_PM_OPS (&max3100_pm_ops) |
|
|
|
#else |
|
#define MAX3100_PM_OPS NULL |
|
#endif |
|
|
|
static struct spi_driver max3100_driver = { |
|
.driver = { |
|
.name = "max3100", |
|
.pm = MAX3100_PM_OPS, |
|
}, |
|
.probe = max3100_probe, |
|
.remove = max3100_remove, |
|
}; |
|
|
|
module_spi_driver(max3100_driver); |
|
|
|
MODULE_DESCRIPTION("MAX3100 driver"); |
|
MODULE_AUTHOR("Christian Pellegrin <[email protected]>"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("spi:max3100");
|
|
|