690 lines
15 KiB
C
690 lines
15 KiB
C
/*
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* Bluetooth Broadcomm and low power control via GPIO
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*
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* Copyright (C) 2011 Google, Inc.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/hrtimer.h>
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#include <linux/irq.h>
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#include <linux/rfkill.h>
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#include <linux/platform_device.h>
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#include <linux/wakelock.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include <linux/delay.h>
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#include <asm/intel-mid.h>
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#include <asm/intel_mid_hsu.h>
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#ifndef CONFIG_ACPI
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#include <asm/bcm_bt_lpm.h>
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#else
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#include <linux/acpi.h>
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#include <linux/acpi_gpio.h>
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enum {
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gpio_wake_acpi_idx,
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gpio_enable_bt_acpi_idx,
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host_wake_acpi_idx
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};
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#endif
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#define LPM_ON
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static struct rfkill *bt_rfkill;
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static bool bt_enabled;
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#ifdef LPM_ON
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static bool host_wake_uart_enabled;
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static bool wake_uart_enabled;
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static bool int_handler_enabled;
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#endif
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static void activate_irq_handler(void);
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struct bcm_bt_lpm {
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#ifdef LPM_ON
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unsigned int gpio_wake;
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unsigned int gpio_host_wake;
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unsigned int int_host_wake;
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#endif
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#ifdef CONFIG_PF450CL
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unsigned int gpio_reg_on;
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unsigned int gpio_reset;
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#else
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unsigned int gpio_enable_bt;
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#endif
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#ifdef LPM_ON
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int wake;
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int host_wake;
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#endif
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struct hrtimer enter_lpm_timer;
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ktime_t enter_lpm_delay;
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struct device *tty_dev;
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#ifdef LPM_ON
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struct wake_lock wake_lock;
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char wake_lock_name[100];
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#endif
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int port;
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} bt_lpm;
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#ifdef LPM_ON
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static void uart_enable(struct device *tty)
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{
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pr_debug("%s: runtime get\n", __func__);
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/* Tell PM runtime to power on the tty device and block s0i3 */
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pm_runtime_get(tty);
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}
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static void uart_disable(struct device *tty)
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{
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pr_debug("%s: runtime put\n", __func__);
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/* Tell PM runtime to release tty device and allow s0i3 */
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pm_runtime_put(tty);
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}
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#endif
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#ifdef CONFIG_ACPI
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static int bcm_bt_lpm_acpi_probe(struct platform_device *pdev)
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{
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struct acpi_gpio_info info;
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acpi_handle handle;
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acpi_integer port;
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/*
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* Handle ACPI specific initializations.
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*/
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dev_dbg(&pdev->dev, "ACPI specific probe\n");
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bt_lpm.gpio_enable_bt = acpi_get_gpio_by_index(&pdev->dev,
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gpio_enable_bt_acpi_idx, &info);
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if (!gpio_is_valid(bt_lpm.gpio_enable_bt)) {
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pr_err("%s: gpio %d for gpio_enable_bt not valid\n", __func__,
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bt_lpm.gpio_enable_bt);
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return -EINVAL;
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}
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#ifdef LPM_ON
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bt_lpm.gpio_wake = acpi_get_gpio_by_index(&pdev->dev,
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gpio_wake_acpi_idx, &info);
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if (!gpio_is_valid(bt_lpm.gpio_wake)) {
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pr_err("%s: gpio %d for gpio_wake not valid\n", __func__,
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bt_lpm.gpio_wake);
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return -EINVAL;
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}
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bt_lpm.gpio_host_wake = acpi_get_gpio_by_index(&pdev->dev,
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host_wake_acpi_idx, &info);
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if (!gpio_is_valid(bt_lpm.gpio_host_wake)) {
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pr_err("%s: gpio %d for gpio_host_wake not valid\n", __func__,
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bt_lpm.gpio_host_wake);
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return -EINVAL;
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}
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bt_lpm.int_host_wake = gpio_to_irq(bt_lpm.gpio_host_wake);
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pr_debug("%s: gpio_wake %d, gpio_host_wake %d, int_host_wake %d\n",
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__func__,
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bt_lpm.gpio_wake,
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bt_lpm.gpio_host_wake,
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bt_lpm.int_host_wake);
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#endif
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handle = DEVICE_ACPI_HANDLE(&pdev->dev);
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if (ACPI_FAILURE(acpi_evaluate_integer(handle, "UART", NULL, &port))) {
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dev_err(&pdev->dev, "Error evaluating UART port number\n");
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/* FIXME - Force port 0 if the information is missing from the
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* ACPI table.
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* That will be removed once the ACPI tables will all have been
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* updated.
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*/
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port = 0;
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}
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bt_lpm.port = port;
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pr_debug("%s: UART port %d\n", __func__, bt_lpm.port);
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return 0;
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}
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#endif /* CONFIG_ACPI */
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static int bcm43xx_bt_rfkill_set_power(void *data, bool blocked)
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{
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/* rfkill_ops callback. Turn transmitter on when blocked is false */
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if (!blocked) {
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#ifdef LPM_ON
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gpio_set_value(bt_lpm.gpio_wake, 1);
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/*
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* Delay advice by BRCM is min 2.5ns,
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* setting it between 10 and 50us for more confort
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*/
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usleep_range(10, 50);
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#endif
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#ifdef CONFIG_PF450CL
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gpio_set_value(bt_lpm.gpio_reg_on, 1);
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gpio_set_value(bt_lpm.gpio_reset, 1);
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#else
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gpio_set_value(bt_lpm.gpio_enable_bt, 1);
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#endif
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pr_debug("%s: turn BT on\n", __func__);
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} else {
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#ifdef CONFIG_PF450CL
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gpio_set_value(bt_lpm.gpio_reg_on, 0);
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gpio_set_value(bt_lpm.gpio_reset, 0);
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#else
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gpio_set_value(bt_lpm.gpio_enable_bt, 0);
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#endif
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pr_debug("%s: turn BT off\n", __func__);
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}
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bt_enabled = !blocked;
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return 0;
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}
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static const struct rfkill_ops bcm43xx_bt_rfkill_ops = {
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.set_block = bcm43xx_bt_rfkill_set_power,
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};
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#ifdef LPM_ON
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static void set_wake_locked(int wake)
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{
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bt_lpm.wake = wake;
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if (!wake)
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wake_unlock(&bt_lpm.wake_lock);
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if (!wake_uart_enabled && wake) {
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WARN_ON(!bt_lpm.tty_dev);
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uart_enable(bt_lpm.tty_dev);
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}
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gpio_set_value(bt_lpm.gpio_wake, wake);
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if (wake_uart_enabled && !wake) {
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WARN_ON(!bt_lpm.tty_dev);
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uart_disable(bt_lpm.tty_dev);
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}
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wake_uart_enabled = wake;
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}
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static enum hrtimer_restart enter_lpm(struct hrtimer *timer)
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{
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pr_debug("%s\n", __func__);
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set_wake_locked(0);
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return HRTIMER_NORESTART;
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}
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static void update_host_wake_locked(int host_wake)
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{
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if (host_wake == bt_lpm.host_wake)
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return;
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bt_lpm.host_wake = host_wake;
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if (host_wake) {
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wake_lock(&bt_lpm.wake_lock);
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if (!host_wake_uart_enabled) {
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WARN_ON(!bt_lpm.tty_dev);
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uart_enable(bt_lpm.tty_dev);
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}
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} else {
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if (host_wake_uart_enabled) {
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WARN_ON(!bt_lpm.tty_dev);
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uart_disable(bt_lpm.tty_dev);
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}
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/*
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* Take a timed wakelock, so that upper layers can take it.
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* The chipset deasserts the hostwake lock, when there is no
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* more data to send.
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*/
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wake_lock_timeout(&bt_lpm.wake_lock, HZ/2);
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}
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host_wake_uart_enabled = host_wake;
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}
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static irqreturn_t host_wake_isr(int irq, void *dev)
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{
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int host_wake;
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host_wake = gpio_get_value(bt_lpm.gpio_host_wake);
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pr_debug("%s: lpm %s\n", __func__, host_wake ? "off" : "on");
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irq_set_irq_type(irq, host_wake ? IRQF_TRIGGER_FALLING :
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IRQF_TRIGGER_RISING);
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if (!bt_lpm.tty_dev) {
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bt_lpm.host_wake = host_wake;
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return IRQ_HANDLED;
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}
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update_host_wake_locked(host_wake);
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return IRQ_HANDLED;
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}
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static void activate_irq_handler(void)
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{
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int ret;
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pr_debug("%s\n", __func__);
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ret = request_irq(bt_lpm.int_host_wake, host_wake_isr,
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IRQF_TRIGGER_RISING, "bt_host_wake", NULL);
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if (ret < 0) {
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pr_err("Error lpm request IRQ");
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gpio_free(bt_lpm.gpio_wake);
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gpio_free(bt_lpm.gpio_host_wake);
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}
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}
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static void bcm_bt_lpm_wake_peer(struct device *dev)
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{
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bt_lpm.tty_dev = dev;
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/*
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* the irq is enabled after the first host wake up signal.
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* in the original code, the irq should be in levels but, since mfld
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* does not support them, irq is triggering with edges.
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*/
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if (!int_handler_enabled) {
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int_handler_enabled = true;
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activate_irq_handler();
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}
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hrtimer_try_to_cancel(&bt_lpm.enter_lpm_timer);
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set_wake_locked(1);
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hrtimer_start(&bt_lpm.enter_lpm_timer, bt_lpm.enter_lpm_delay,
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HRTIMER_MODE_REL);
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}
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static int bcm_bt_lpm_init(struct platform_device *pdev)
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{
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int ret;
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struct device *tty_dev;
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hrtimer_init(&bt_lpm.enter_lpm_timer, CLOCK_MONOTONIC,
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HRTIMER_MODE_REL);
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bt_lpm.enter_lpm_delay = ktime_set(1, 0); /* 1 sec */
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bt_lpm.enter_lpm_timer.function = enter_lpm;
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bt_lpm.host_wake = 0;
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if (bt_lpm.gpio_host_wake < 0) {
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pr_err("Error bt_lpm.gpio_host_wake\n");
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return -ENODEV;
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}
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ret = irq_set_irq_wake(bt_lpm.int_host_wake, 1);
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if (ret < 0) {
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pr_err("Error lpm set irq IRQ");
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gpio_free(bt_lpm.gpio_wake);
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gpio_free(bt_lpm.gpio_host_wake);
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return ret;
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}
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tty_dev = intel_mid_hsu_set_wake_peer(bt_lpm.port,
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bcm_bt_lpm_wake_peer);
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if (!tty_dev) {
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pr_err("Error no tty dev");
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gpio_free(bt_lpm.gpio_wake);
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gpio_free(bt_lpm.gpio_host_wake);
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return -ENODEV;
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}
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snprintf(bt_lpm.wake_lock_name, sizeof(bt_lpm.wake_lock_name),
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"BTLowPower");
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wake_lock_init(&bt_lpm.wake_lock, WAKE_LOCK_SUSPEND,
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bt_lpm.wake_lock_name);
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bcm_bt_lpm_wake_peer(tty_dev);
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return 0;
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}
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#endif
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#ifndef CONFIG_ACPI
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static int bcm43xx_bluetooth_pdata_probe(struct platform_device *pdev)
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{
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struct bcm_bt_lpm_platform_data *pdata = pdev->dev.platform_data;
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if (pdata == NULL) {
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pr_err("Cannot register bcm_bt_lpm drivers, pdata is NULL\n");
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return -EINVAL;
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}
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#ifndef CONFIG_PF450CL
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if (!gpio_is_valid(pdata->gpio_enable)) {
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pr_err("%s: gpio not valid\n", __func__);
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return -EINVAL;
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}
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#endif
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#ifdef LPM_ON
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if (!gpio_is_valid(pdata->gpio_wake) ||
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!gpio_is_valid(pdata->gpio_host_wake)) {
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pr_err("%s: gpio not valid\n", __func__);
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return -EINVAL;
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}
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#endif
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#ifdef CONFIG_PF450CL
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if (!gpio_is_valid(pdata->gpio_reg_on) ||
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!gpio_is_valid(pdata->gpio_reset)) {
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pr_err("%s: gpio not valid\n", __func__);
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return -EINVAL;
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}
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#endif
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#ifdef LPM_ON
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bt_lpm.gpio_wake = pdata->gpio_wake;
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bt_lpm.gpio_host_wake = pdata->gpio_host_wake;
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bt_lpm.int_host_wake = pdata->int_host_wake;
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#endif
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#ifndef CONFIG_PF450CL
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bt_lpm.gpio_enable_bt = pdata->gpio_enable;
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#endif
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#ifdef CONFIG_PF450CL
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bt_lpm.gpio_reg_on = pdata->gpio_reg_on;
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bt_lpm.gpio_reset = pdata->gpio_reset;
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#endif
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bt_lpm.port = pdata->port;
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return 0;
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}
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#endif /* !CONFIG_ACPI */
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static int bcm43xx_bluetooth_probe(struct platform_device *pdev)
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{
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bool default_state = true; /* off */
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int ret = 0;
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#ifdef LPM_ON
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int_handler_enabled = false;
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#endif
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#ifdef CONFIG_ACPI
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if (ACPI_HANDLE(&pdev->dev)) {
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/*
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* acpi specific probe
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*/
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pr_debug("%s for ACPI device %s\n", __func__,
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dev_name(&pdev->dev));
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if (bcm_bt_lpm_acpi_probe(pdev) < 0)
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ret = -EINVAL;
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} else
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ret = -ENODEV;
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#else
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ret = bcm43xx_bluetooth_pdata_probe(pdev);
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#endif
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if (ret < 0) {
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pr_err("%s: Cannot register platform data\n", __func__);
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goto err_data_probe;
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}
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#ifdef CONFIG_PF450CL
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ret = gpio_request(bt_lpm.gpio_reg_on, pdev->name);
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if (ret < 0) {
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pr_err("%s: Unable to request gpio %d\n", __func__,
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bt_lpm.gpio_reg_on);
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goto err_gpio_enable_req;
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}
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ret = gpio_direction_output(bt_lpm.gpio_reg_on, 0);
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if (ret < 0) {
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pr_err("%s: Unable to set int direction for gpio %d\n",
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__func__, bt_lpm.gpio_reg_on);
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goto err_gpio_enable_dir;
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}
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ret = gpio_request(bt_lpm.gpio_reset, pdev->name);
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if (ret < 0) {
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pr_err("%s: Unable to request gpio %d\n", __func__,
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bt_lpm.gpio_reset);
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goto err_gpio_enable_req;
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}
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ret = gpio_direction_output(bt_lpm.gpio_reset, 0);
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if (ret < 0) {
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pr_err("%s: Unable to set int direction for gpio %d\n",
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__func__, bt_lpm.gpio_reset);
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goto err_gpio_enable_dir;
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}
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#else
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ret = gpio_request(bt_lpm.gpio_enable_bt, pdev->name);
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if (ret < 0) {
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pr_err("%s: Unable to request gpio %d\n", __func__,
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bt_lpm.gpio_enable_bt);
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goto err_gpio_enable_req;
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}
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ret = gpio_direction_output(bt_lpm.gpio_enable_bt, 0);
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if (ret < 0) {
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pr_err("%s: Unable to set int direction for gpio %d\n",
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__func__, bt_lpm.gpio_enable_bt);
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goto err_gpio_enable_dir;
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}
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#endif
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#ifdef LPM_ON
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ret = gpio_request(bt_lpm.gpio_host_wake, pdev->name);
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if (ret < 0) {
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pr_err("%s: Unable to request gpio %d\n",
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__func__, bt_lpm.gpio_host_wake);
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goto err_gpio_host_wake_req;
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}
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ret = gpio_direction_input(bt_lpm.gpio_host_wake);
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if (ret < 0) {
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pr_err("%s: Unable to set direction for gpio %d\n", __func__,
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bt_lpm.gpio_host_wake);
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goto err_gpio_host_wake_dir;
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}
|
|
|
|
ret = gpio_request(bt_lpm.gpio_wake, pdev->name);
|
|
if (ret < 0) {
|
|
pr_err("%s: Unable to request gpio %d\n", __func__,
|
|
bt_lpm.gpio_wake);
|
|
goto err_gpio_wake_req;
|
|
}
|
|
|
|
ret = gpio_direction_output(bt_lpm.gpio_wake, 0);
|
|
if (ret < 0) {
|
|
pr_err("%s: Unable to set direction for gpio %d\n", __func__,
|
|
bt_lpm.gpio_wake);
|
|
goto err_gpio_wake_dir;
|
|
}
|
|
|
|
#ifdef CONFIG_PF450CL
|
|
pr_debug("%s: gpio_reset=%d, gpio_reg_on=%d, gpio_wake=%d, gpio_host_wake=%d\n",
|
|
__func__,
|
|
bt_lpm.gpio_reset,
|
|
bt_lpm.gpio_reg_on,
|
|
bt_lpm.gpio_wake,
|
|
bt_lpm.gpio_host_wake);
|
|
#else
|
|
pr_debug("%s: gpio_enable=%d, gpio_wake=%d, gpio_host_wake=%d\n",
|
|
__func__,
|
|
bt_lpm.gpio_enable_bt,
|
|
bt_lpm.gpio_wake,
|
|
bt_lpm.gpio_host_wake);
|
|
#endif
|
|
#endif
|
|
|
|
bt_rfkill = rfkill_alloc("bcm43xx Bluetooth", &pdev->dev,
|
|
RFKILL_TYPE_BLUETOOTH, &bcm43xx_bt_rfkill_ops,
|
|
NULL);
|
|
if (unlikely(!bt_rfkill)) {
|
|
ret = -ENOMEM;
|
|
goto err_rfkill_alloc;
|
|
}
|
|
|
|
bcm43xx_bt_rfkill_set_power(NULL, default_state);
|
|
rfkill_init_sw_state(bt_rfkill, default_state);
|
|
|
|
ret = rfkill_register(bt_rfkill);
|
|
if (unlikely(ret))
|
|
goto err_rfkill_register;
|
|
|
|
#ifdef LPM_ON
|
|
ret = bcm_bt_lpm_init(pdev);
|
|
if (ret)
|
|
goto err_lpm_init;
|
|
#endif
|
|
|
|
return ret;
|
|
|
|
err_lpm_init:
|
|
rfkill_unregister(bt_rfkill);
|
|
err_rfkill_register:
|
|
rfkill_destroy(bt_rfkill);
|
|
err_rfkill_alloc:
|
|
#ifdef LPM_ON
|
|
err_gpio_wake_dir:
|
|
gpio_free(bt_lpm.gpio_wake);
|
|
err_gpio_wake_req:
|
|
err_gpio_host_wake_dir:
|
|
gpio_free(bt_lpm.gpio_host_wake);
|
|
err_gpio_host_wake_req:
|
|
#endif
|
|
err_gpio_enable_dir:
|
|
#ifdef CONFIG_PF450CL
|
|
gpio_free(bt_lpm.gpio_reg_on);
|
|
gpio_free(bt_lpm.gpio_reset);
|
|
#else
|
|
gpio_free(bt_lpm.gpio_enable_bt);
|
|
#endif
|
|
err_gpio_enable_req:
|
|
err_data_probe:
|
|
return ret;
|
|
}
|
|
|
|
static int bcm43xx_bluetooth_remove(struct platform_device *pdev)
|
|
{
|
|
rfkill_unregister(bt_rfkill);
|
|
rfkill_destroy(bt_rfkill);
|
|
|
|
#ifdef CONFIG_PF450CL
|
|
gpio_free(bt_lpm.gpio_reg_on);
|
|
gpio_free(bt_lpm.gpio_reset);
|
|
#else
|
|
gpio_free(bt_lpm.gpio_enable_bt);
|
|
#endif
|
|
#ifdef LPM_ON
|
|
gpio_free(bt_lpm.gpio_wake);
|
|
gpio_free(bt_lpm.gpio_host_wake);
|
|
wake_lock_destroy(&bt_lpm.wake_lock);
|
|
#endif
|
|
return 0;
|
|
}
|
|
#ifdef LPM_ON
|
|
int bcm43xx_bluetooth_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
int host_wake;
|
|
|
|
pr_debug("%s\n", __func__);
|
|
|
|
if (!bt_enabled)
|
|
return 0;
|
|
|
|
disable_irq(bt_lpm.int_host_wake);
|
|
host_wake = gpio_get_value(bt_lpm.gpio_host_wake);
|
|
if (host_wake) {
|
|
enable_irq(bt_lpm.int_host_wake);
|
|
pr_err("%s suspend error, gpio %d set\n", __func__,
|
|
bt_lpm.gpio_host_wake);
|
|
return -EBUSY;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bcm43xx_bluetooth_resume(struct platform_device *pdev)
|
|
{
|
|
pr_debug("%s\n", __func__);
|
|
|
|
if (bt_enabled)
|
|
enable_irq(bt_lpm.int_host_wake);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static struct acpi_device_id bcm_id_table[] = {
|
|
/* ACPI IDs here */
|
|
{ "BCM2E1A", 0 },
|
|
{ "BCM2E3A", 0 },
|
|
{ "OBDA8723", 0},
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(acpi, bcm_id_table);
|
|
#endif
|
|
|
|
static struct platform_driver bcm43xx_bluetooth_platform_driver = {
|
|
.probe = bcm43xx_bluetooth_probe,
|
|
.remove = bcm43xx_bluetooth_remove,
|
|
#ifdef LPM_ON
|
|
.suspend = bcm43xx_bluetooth_suspend,
|
|
.resume = bcm43xx_bluetooth_resume,
|
|
#endif
|
|
.driver = {
|
|
.name = "bcm_bt_lpm",
|
|
.owner = THIS_MODULE,
|
|
#ifdef CONFIG_ACPI
|
|
.acpi_match_table = ACPI_PTR(bcm_id_table),
|
|
#endif
|
|
},
|
|
};
|
|
|
|
static int __init bcm43xx_bluetooth_init(void)
|
|
{
|
|
bt_enabled = false;
|
|
return platform_driver_register(&bcm43xx_bluetooth_platform_driver);
|
|
}
|
|
|
|
static void __exit bcm43xx_bluetooth_exit(void)
|
|
{
|
|
platform_driver_unregister(&bcm43xx_bluetooth_platform_driver);
|
|
}
|
|
|
|
|
|
module_init(bcm43xx_bluetooth_init);
|
|
module_exit(bcm43xx_bluetooth_exit);
|
|
|
|
MODULE_ALIAS("platform:bcm43xx");
|
|
MODULE_DESCRIPTION("bcm43xx_bluetooth");
|
|
MODULE_AUTHOR("Jaikumar Ganesh <jaikumar@google.com>");
|
|
MODULE_LICENSE("GPL");
|
|
|