serial: max310x: Add support for RS-485 mode

This patch adds support for RS-485 (TIOCSRS485/TIOCGRS485) IOCTLs.
As a result this patch eliminate private driver header.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 56 insertions, 70 deletions

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index c180576546ed..090f25d4a019 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -26,8 +26,6 @@
 #include <linux/gpio.h>
 #include <linux/spi/spi.h>
 
-#include <linux/platform_data/max310x.h>
-
 #define MAX310X_NAME                    "max310x"
 #define MAX310X_MAJOR                   204
 #define MAX310X_MINOR                   209
@@ -293,7 +291,6 @@ struct max310x_port {
         struct regmap           *regmap;
         struct mutex            mutex;
         struct clk              *clk;
-        struct max310x_pdata    *pdata;
 #ifdef CONFIG_GPIOLIB
         struct gpio_chip        gpio;
 #endif
@@ -898,26 +895,70 @@ static void max310x_set_termios(struct uart_port *port,
         uart_update_timeout(port, termios->c_cflag, baud);
 }
 
+static int max310x_ioctl(struct uart_port *port, unsigned int cmd,
+                         unsigned long arg)
+{
+        struct serial_rs485 rs485;
+        unsigned int val;
+
+        switch (cmd) {
+        case TIOCSRS485:
+                if (copy_from_user(&rs485, (struct serial_rs485 *)arg,
+                                   sizeof(rs485)))
+                        return -EFAULT;
+                if (rs485.delay_rts_before_send > 0x0f ||
+                    rs485.delay_rts_after_send > 0x0f)
+                        return -ERANGE;
+                val = (rs485.delay_rts_before_send << 4) |
+                      rs485.delay_rts_after_send;
+                max310x_port_write(port, MAX310X_HDPIXDELAY_REG, val);
+                if (rs485.flags & SER_RS485_ENABLED) {
+                        max310x_port_update(port, MAX310X_MODE1_REG,
+                                            MAX310X_MODE1_TRNSCVCTRL_BIT,
+                                            MAX310X_MODE1_TRNSCVCTRL_BIT);
+                        max310x_port_update(port, MAX310X_MODE2_REG,
+                                            MAX310X_MODE2_ECHOSUPR_BIT,
+                                            MAX310X_MODE2_ECHOSUPR_BIT);
+                } else {
+                        max310x_port_update(port, MAX310X_MODE1_REG,
+                                            MAX310X_MODE1_TRNSCVCTRL_BIT, 0);
+                        max310x_port_update(port, MAX310X_MODE2_REG,
+                                            MAX310X_MODE2_ECHOSUPR_BIT, 0);
+                }
+                break;
+        case TIOCGRS485:
+                memset(&rs485, 0, sizeof(rs485));
+                val = max310x_port_read(port, MAX310X_MODE1_REG);
+                rs485.flags = (val & MAX310X_MODE1_TRNSCVCTRL_BIT) ?
+                              SER_RS485_ENABLED : 0;
+                rs485.flags |= SER_RS485_RTS_ON_SEND;
+                val = max310x_port_read(port, MAX310X_HDPIXDELAY_REG);
+                rs485.delay_rts_before_send = val >> 4;
+                rs485.delay_rts_after_send = val & 0x0f;
+                if (copy_to_user((struct serial_rs485 *)arg, &rs485,
+                                 sizeof(rs485)))
+                        return -EFAULT;
+                break;
+        default:
+                return -ENOIOCTLCMD;
+        }
+
+        return 0;
+}
+
 static int max310x_startup(struct uart_port *port)
 {
-        unsigned int val, line = port->line;
         struct max310x_port *s = dev_get_drvdata(port->dev);
+        unsigned int val;
 
         s->devtype->power(port, 1);
 
         /* Configure MODE1 register */
         max310x_port_update(port, MAX310X_MODE1_REG,
-                            MAX310X_MODE1_TRNSCVCTRL_BIT,
-                            (s->pdata->uart_flags[line] & MAX310X_AUTO_DIR_CTRL)
-                            ? MAX310X_MODE1_TRNSCVCTRL_BIT : 0);
+                            MAX310X_MODE1_TRNSCVCTRL_BIT, 0);
 
-        /* Configure MODE2 register */
-        val = MAX310X_MODE2_RXEMPTINV_BIT;
-        if (s->pdata->uart_flags[line] & MAX310X_ECHO_SUPRESS)
-                val |= MAX310X_MODE2_ECHOSUPR_BIT;
-
-        /* Reset FIFOs */
-        val |= MAX310X_MODE2_FIFORST_BIT;
+        /* Configure MODE2 register & Reset FIFOs*/
+        val = MAX310X_MODE2_RXEMPTINV_BIT | MAX310X_MODE2_FIFORST_BIT;
         max310x_port_write(port, MAX310X_MODE2_REG, val);
         max310x_port_update(port, MAX310X_MODE2_REG,
                             MAX310X_MODE2_FIFORST_BIT, 0);
@@ -998,6 +1039,7 @@ static const struct uart_ops max310x_ops = {
         .release_port   = max310x_null_void,
         .config_port    = max310x_config_port,
         .verify_port    = max310x_verify_port,
+        .ioctl          = max310x_ioctl,
 };
 
 static int __maybe_unused max310x_suspend(struct device *dev)
@@ -1077,7 +1119,6 @@ static int max310x_gpio_direction_output(struct gpio_chip *chip,
 static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
                          struct regmap *regmap, int irq)
 {
-        struct max310x_pdata *pdata = dev_get_platdata(dev);
         int i, ret, fmin, fmax, freq, uartclk;
         struct clk *clk_osc, *clk_xtal;
         struct max310x_port *s;
@@ -1086,11 +1127,6 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
         if (IS_ERR(regmap))
                 return PTR_ERR(regmap);
 
-        if (!pdata) {
-                dev_err(dev, "No platform data supplied\n");
-                return -EINVAL;
-        }
-
         /* Alloc port structure */
         s = devm_kzalloc(dev, sizeof(*s) +
                          sizeof(struct max310x_one) * devtype->nr, GFP_KERNEL);
@@ -1129,7 +1165,6 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
                 goto out_clk;
         }
 
-        s->pdata = pdata;
         s->regmap = regmap;
         s->devtype = devtype;
         dev_set_drvdata(dev, s);
diff --git a/include/linux/platform_data/max310x.h b/include/linux/platform_data/max310x.h
deleted file mode 100644
index 1140a57e735f..000000000000
--- a/include/linux/platform_data/max310x.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
- *  Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver
- *
- *  Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
- *
- *  Based on max3100.c, by Christian Pellegrin <chripell@evolware.org>
- *  Based on max3110.c, by Feng Tang <feng.tang@intel.com>
- *  Based on max3107.c, by Aavamobile
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- */
-
-#ifndef _MAX310X_H_
-#define _MAX310X_H_
-
-/*
- * Example board initialization data:
- *
- * static struct max310x_pdata max3107_pdata = {
- *      .uart_flags[0]  = MAX310X_ECHO_SUPRESS | MAX310X_AUTO_DIR_CTRL,
- * };
- *
- * static struct spi_board_info spi_device_max3107[] = {
- *      {
- *              .modalias       = "max3107",