include/linux/platform_data/msm_serial_hs.h

   1 /*
   2  * Copyright (C) 2008 Google, Inc.
   3  * Author: Nick Pelly <npelly@google.com>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #ifndef __ASM_ARCH_MSM_SERIAL_HS_H
  16 #define __ASM_ARCH_MSM_SERIAL_HS_H
  17
  18 #include <linux/serial_core.h>
  19
  20 /* API to request the uart clock off or on for low power management
  21  * Clients should call request_clock_off() when no uart data is expected,
  22  * and must call request_clock_on() before any further uart data can be
  23  * received. */
  24 extern void msm_hs_request_clock_off(struct uart_port *uport);
  25 extern void msm_hs_request_clock_on(struct uart_port *uport);
  26
  27 /**
  28  * struct msm_serial_hs_platform_data
  29  * @rx_wakeup_irq: Rx activity irq
  30  * @rx_to_inject: extra character to be inserted to Rx tty on wakeup
  31  * @inject_rx: 1 = insert rx_to_inject. 0 = do not insert extra character
  32  * @exit_lpm_cb: function called before every Tx transaction
  33  *
  34  * This is an optional structure required for UART Rx GPIO IRQ based
  35  * wakeup from low power state. UART wakeup can be triggered by RX activity
  36  * (using a wakeup GPIO on the UART RX pin). This should only be used if
  37  * there is not a wakeup GPIO on the UART CTS, and the first RX byte is
  38  * known (eg., with the Bluetooth Texas Instruments HCILL protocol),
  39  * since the first RX byte will always be lost. RTS will be asserted even
  40  * while the UART is clocked off in this mode of operation.
  41  */
  42 struct msm_serial_hs_platform_data {
  43         int rx_wakeup_irq;
  44         unsigned char inject_rx_on_wakeup;
  45         char rx_to_inject;
  46         void (*exit_lpm_cb)(struct uart_port *);
  47 };
  48
  49 #endif