| /* |
| * Atheros Communication Bluetooth HCIATH3K UART protocol |
| * |
| * HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's |
| * power management protocol extension to H4 to support AR300x Bluetooth Chip. |
| * |
| * Copyright (c) 2009-2010 Atheros Communications Inc. |
| * Copyright (c) 2012-2014 The Linux Foundation. All rights reserved. |
| * |
| * Acknowledgements: |
| * This file is based on hci_h4.c, which was written |
| * by Maxim Krasnyansky and Marcel Holtmann. |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/tty.h> |
| #include <linux/errno.h> |
| #include <linux/ioctl.h> |
| #include <linux/skbuff.h> |
| #include <linux/platform_device.h> |
| #include <linux/gpio.h> |
| #include <linux/of_gpio.h> |
| #include <linux/proc_fs.h> |
| |
| #include <net/bluetooth/bluetooth.h> |
| #include <net/bluetooth/hci_core.h> |
| |
| #include "hci_uart.h" |
| #ifdef CONFIG_SERIAL_MSM_HS |
| #include <linux/platform_data/msm_serial_hs.h> |
| #endif |
| |
| static int enableuartsleep = 1; |
| module_param(enableuartsleep, int, 0644); |
| MODULE_PARM_DESC(enableuartsleep, "Enable Atheros Sleep Protocol"); |
| |
| /* |
| * Global variables |
| */ |
| |
| /** Device table */ |
| static struct of_device_id bluesleep_match_table[] = { |
| { .compatible = "qca,ar3002_bluesleep" }, |
| {} |
| }; |
| |
| /** Global state flags */ |
| static unsigned long flags; |
| |
| /** To Check LPM is enabled */ |
| static bool is_lpm_enabled; |
| |
| /** Workqueue to respond to change in hostwake line */ |
| static void wakeup_host_work(struct work_struct *work); |
| |
| /** Transmission timer */ |
| static void bluesleep_tx_timer_expire(unsigned long data); |
| static DEFINE_TIMER(tx_timer, bluesleep_tx_timer_expire, 0, 0); |
| |
| /** Lock for state transitions */ |
| static spinlock_t rw_lock; |
| |
| #define PROC_DIR "bluetooth/sleep" |
| |
| #define POLARITY_LOW 0 |
| #define POLARITY_HIGH 1 |
| |
| struct bluesleep_info { |
| unsigned host_wake; /* wake up host */ |
| unsigned ext_wake; /* wake up device */ |
| unsigned host_wake_irq; |
| int irq_polarity; |
| struct uart_port *uport; |
| }; |
| |
| struct work_struct ws_sleep; |
| |
| /* 1 second timeout */ |
| #define TX_TIMER_INTERVAL 1 |
| |
| /* state variable names and bit positions */ |
| #define BT_TXEXPIRED 0x01 |
| #define BT_SLEEPENABLE 0x02 |
| #define BT_SLEEPCMD 0x03 |
| |
| /* global pointer to a single hci device. */ |
| static struct bluesleep_info *bsi; |
| |
| struct ath_struct { |
| struct hci_uart *hu; |
| unsigned int cur_sleep; |
| |
| struct sk_buff_head txq; |
| struct work_struct ctxtsw; |
| }; |
| |
| static void hsuart_serial_clock_on(struct uart_port *port) |
| { |
| BT_DBG(""); |
| if (port) |
| msm_hs_request_clock_on(port); |
| else |
| BT_INFO("Uart has not voted for Clock ON"); |
| } |
| |
| static void hsuart_serial_clock_off(struct uart_port *port) |
| { |
| BT_DBG(""); |
| if (port) |
| msm_hs_request_clock_off(port); |
| else |
| BT_INFO("Uart has not voted for Clock OFF"); |
| } |
| |
| static void modify_timer_task(void) |
| { |
| spin_lock(&rw_lock); |
| mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL * HZ)); |
| clear_bit(BT_TXEXPIRED, &flags); |
| spin_unlock(&rw_lock); |
| |
| } |
| |
| static int ath_wakeup_ar3k(void) |
| { |
| int status = 0; |
| if (test_bit(BT_TXEXPIRED, &flags)) { |
| hsuart_serial_clock_on(bsi->uport); |
| BT_DBG("wakeup device\n"); |
| gpio_set_value(bsi->ext_wake, 0); |
| msleep(20); |
| gpio_set_value(bsi->ext_wake, 1); |
| } |
| if (!is_lpm_enabled) |
| modify_timer_task(); |
| return status; |
| } |
| |
| static void wakeup_host_work(struct work_struct *work) |
| { |
| |
| BT_DBG("wake up host"); |
| if (test_bit(BT_SLEEPENABLE, &flags)) { |
| if (test_bit(BT_TXEXPIRED, &flags)) |
| hsuart_serial_clock_on(bsi->uport); |
| } |
| if (!is_lpm_enabled) |
| modify_timer_task(); |
| } |
| |
| static void ath_hci_uart_work(struct work_struct *work) |
| { |
| int status; |
| struct ath_struct *ath; |
| struct hci_uart *hu; |
| |
| ath = container_of(work, struct ath_struct, ctxtsw); |
| |
| hu = ath->hu; |
| |
| /* verify and wake up controller */ |
| if (test_bit(BT_SLEEPENABLE, &flags)) |
| status = ath_wakeup_ar3k(); |
| /* Ready to send Data */ |
| clear_bit(HCI_UART_SENDING, &hu->tx_state); |
| hci_uart_tx_wakeup(hu); |
| } |
| |
| static irqreturn_t bluesleep_hostwake_isr(int irq, void *dev_id) |
| { |
| /* schedule a work to global shared workqueue to handle |
| * the change in the host wake line |
| */ |
| schedule_work(&ws_sleep); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int ath_bluesleep_gpio_config(int on) |
| { |
| int ret = 0; |
| |
| BT_INFO("%s config: %d", __func__, on); |
| if (!on) { |
| if (disable_irq_wake(bsi->host_wake_irq)) |
| BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n"); |
| goto free_host_wake_irq; |
| } |
| |
| ret = gpio_request(bsi->host_wake, "bt_host_wake"); |
| if (ret < 0) { |
| BT_ERR("failed to request gpio pin %d, error %d\n", |
| bsi->host_wake, ret); |
| goto gpio_config_failed; |
| } |
| |
| /* configure host_wake as input */ |
| ret = gpio_direction_input(bsi->host_wake); |
| if (ret < 0) { |
| BT_ERR("failed to config GPIO %d as input pin, err %d\n", |
| bsi->host_wake, ret); |
| goto gpio_host_wake; |
| } |
| |
| ret = gpio_request(bsi->ext_wake, "bt_ext_wake"); |
| if (ret < 0) { |
| BT_ERR("failed to request gpio pin %d, error %d\n", |
| bsi->ext_wake, ret); |
| goto gpio_host_wake; |
| } |
| |
| ret = gpio_direction_output(bsi->ext_wake, 1); |
| if (ret < 0) { |
| BT_ERR("failed to config GPIO %d as output pin, err %d\n", |
| bsi->ext_wake, ret); |
| goto gpio_ext_wake; |
| } |
| |
| gpio_set_value(bsi->ext_wake, 1); |
| |
| /* Initialize spinlock. */ |
| spin_lock_init(&rw_lock); |
| |
| /* Initialize timer */ |
| init_timer(&tx_timer); |
| tx_timer.function = bluesleep_tx_timer_expire; |
| tx_timer.data = 0; |
| |
| if (bsi->irq_polarity == POLARITY_LOW) { |
| ret = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr, |
| IRQF_DISABLED | IRQF_TRIGGER_FALLING, |
| "bluetooth hostwake", NULL); |
| } else { |
| ret = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr, |
| IRQF_DISABLED | IRQF_TRIGGER_RISING, |
| "bluetooth hostwake", NULL); |
| } |
| if (ret < 0) { |
| BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ"); |
| goto delete_timer; |
| } |
| |
| ret = enable_irq_wake(bsi->host_wake_irq); |
| if (ret < 0) { |
| BT_ERR("Couldn't enable BT_HOST_WAKE as wakeup interrupt"); |
| goto free_host_wake_irq; |
| } |
| |
| return 0; |
| |
| free_host_wake_irq: |
| free_irq(bsi->host_wake_irq, NULL); |
| delete_timer: |
| del_timer(&tx_timer); |
| gpio_ext_wake: |
| gpio_free(bsi->ext_wake); |
| gpio_host_wake: |
| gpio_free(bsi->host_wake); |
| gpio_config_failed: |
| return ret; |
| } |
| |
| static int ath_lpm_start(void) |
| { |
| BT_DBG("Start LPM mode"); |
| |
| if (!bsi) { |
| BT_ERR("HCIATH3K bluesleep info does not exist"); |
| return -EIO; |
| } |
| |
| bsi->uport = msm_hs_get_uart_port(0); |
| if (!bsi->uport) { |
| BT_ERR("UART Port is not available"); |
| return -ENODEV; |
| } |
| |
| INIT_WORK(&ws_sleep, wakeup_host_work); |
| |
| if (ath_bluesleep_gpio_config(1) < 0) { |
| BT_ERR("HCIATH3K GPIO Config failed"); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int ath_lpm_stop(void) |
| { |
| BT_DBG("Stop LPM mode"); |
| cancel_work_sync(&ws_sleep); |
| |
| if (bsi) { |
| bsi->uport = NULL; |
| ath_bluesleep_gpio_config(0); |
| } |
| |
| return 0; |
| } |
| |
| /* Initialize protocol */ |
| static int ath_open(struct hci_uart *hu) |
| { |
| struct ath_struct *ath; |
| struct uart_state *state; |
| |
| BT_DBG("hu %p, bsi %p", hu, bsi); |
| |
| if (!bsi) { |
| BT_ERR("HCIATH3K bluesleep info does not exist"); |
| return -EIO; |
| } |
| |
| ath = kzalloc(sizeof(*ath), GFP_ATOMIC); |
| if (!ath) { |
| BT_ERR("HCIATH3K Memory not enough to init driver"); |
| return -ENOMEM; |
| } |
| |
| skb_queue_head_init(&ath->txq); |
| |
| hu->priv = ath; |
| ath->hu = hu; |
| state = hu->tty->driver_data; |
| |
| if (!state) { |
| BT_ERR("HCIATH3K tty driver data does not exist"); |
| return -ENXIO; |
| } |
| bsi->uport = state->uart_port; |
| |
| if (ath_bluesleep_gpio_config(1) < 0) { |
| BT_ERR("HCIATH3K GPIO Config failed"); |
| hu->priv = NULL; |
| kfree(ath); |
| return -EIO; |
| } |
| |
| ath->cur_sleep = enableuartsleep; |
| if (ath->cur_sleep == 1) { |
| set_bit(BT_SLEEPENABLE, &flags); |
| modify_timer_task(); |
| } |
| INIT_WORK(&ath->ctxtsw, ath_hci_uart_work); |
| INIT_WORK(&ws_sleep, wakeup_host_work); |
| return 0; |
| } |
| |
| /* Flush protocol data */ |
| static int ath_flush(struct hci_uart *hu) |
| { |
| struct ath_struct *ath = hu->priv; |
| |
| BT_DBG("hu %p", hu); |
| |
| skb_queue_purge(&ath->txq); |
| |
| return 0; |
| } |
| |
| /* Close protocol */ |
| static int ath_close(struct hci_uart *hu) |
| { |
| struct ath_struct *ath = hu->priv; |
| |
| BT_DBG("hu %p", hu); |
| |
| skb_queue_purge(&ath->txq); |
| |
| cancel_work_sync(&ath->ctxtsw); |
| |
| cancel_work_sync(&ws_sleep); |
| |
| if (bsi) |
| ath_bluesleep_gpio_config(0); |
| |
| hu->priv = NULL; |
| bsi->uport = NULL; |
| kfree(ath); |
| |
| return 0; |
| } |
| |
| #define HCI_OP_ATH_SLEEP 0xFC04 |
| |
| /* Enqueue frame for transmittion */ |
| static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
| { |
| struct ath_struct *ath = hu->priv; |
| |
| BT_DBG(""); |
| |
| if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) { |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* |
| * Update power management enable flag with parameters of |
| * HCI sleep enable vendor specific HCI command. |
| */ |
| if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) { |
| struct hci_command_hdr *hdr = (void *)skb->data; |
| if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) { |
| set_bit(BT_SLEEPCMD, &flags); |
| ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; |
| } |
| } |
| |
| BT_DBG("hu %p skb %p", hu, skb); |
| |
| /* Prepend skb with frame type */ |
| memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
| |
| skb_queue_tail(&ath->txq, skb); |
| set_bit(HCI_UART_SENDING, &hu->tx_state); |
| |
| schedule_work(&ath->ctxtsw); |
| |
| return 0; |
| } |
| |
| static struct sk_buff *ath_dequeue(struct hci_uart *hu) |
| { |
| struct ath_struct *ath = hu->priv; |
| |
| return skb_dequeue(&ath->txq); |
| } |
| |
| /* Recv data */ |
| static int ath_recv(struct hci_uart *hu, void *data, int count) |
| { |
| struct ath_struct *ath = hu->priv; |
| unsigned int type; |
| |
| BT_DBG(""); |
| |
| if (hci_recv_stream_fragment(hu->hdev, data, count) < 0) |
| BT_ERR("Frame Reassembly Failed"); |
| |
| if (count & test_bit(BT_SLEEPCMD, &flags)) { |
| struct sk_buff *skb = hu->hdev->reassembly[0]; |
| |
| if (!skb) { |
| struct { char type; } *pkt; |
| |
| /* Start of the frame */ |
| pkt = data; |
| type = pkt->type; |
| } else |
| type = bt_cb(skb)->pkt_type; |
| |
| if (type == HCI_EVENT_PKT) { |
| clear_bit(BT_SLEEPCMD, &flags); |
| BT_INFO("cur_sleep:%d\n", ath->cur_sleep); |
| if (ath->cur_sleep == 1) |
| set_bit(BT_SLEEPENABLE, &flags); |
| else |
| clear_bit(BT_SLEEPENABLE, &flags); |
| } |
| if (test_bit(BT_SLEEPENABLE, &flags)) |
| modify_timer_task(); |
| } |
| return count; |
| } |
| |
| static void bluesleep_tx_timer_expire(unsigned long data) |
| { |
| |
| if (!test_bit(BT_SLEEPENABLE, &flags)) |
| return; |
| BT_INFO("Tx timer expired\n"); |
| |
| set_bit(BT_TXEXPIRED, &flags); |
| hsuart_serial_clock_off(bsi->uport); |
| } |
| |
| static struct hci_uart_proto athp = { |
| .id = HCI_UART_ATH3K, |
| .open = ath_open, |
| .close = ath_close, |
| .recv = ath_recv, |
| .enqueue = ath_enqueue, |
| .dequeue = ath_dequeue, |
| .flush = ath_flush, |
| }; |
| |
| static int lpm_enabled; |
| |
| static int bluesleep_lpm_set(const char *val, const struct kernel_param *kp) |
| { |
| int ret; |
| |
| ret = param_set_int(val, kp); |
| |
| if (ret) { |
| BT_ERR("HCIATH3K: lpm enable parameter set failed"); |
| return ret; |
| } |
| |
| BT_DBG("lpm : %d", lpm_enabled); |
| |
| if ((lpm_enabled == 0) && is_lpm_enabled) { |
| ath_lpm_stop(); |
| clear_bit(BT_SLEEPENABLE, &flags); |
| is_lpm_enabled = false; |
| } else if ((lpm_enabled == 1) && !is_lpm_enabled) { |
| if (ath_lpm_start() < 0) { |
| BT_ERR("HCIATH3K LPM mode failed"); |
| return -EIO; |
| } |
| set_bit(BT_SLEEPENABLE, &flags); |
| is_lpm_enabled = true; |
| } else { |
| BT_ERR("HCIATH3K invalid lpm value"); |
| return -EINVAL; |
| } |
| return 0; |
| |
| } |
| |
| static struct kernel_param_ops bluesleep_lpm_ops = { |
| .set = bluesleep_lpm_set, |
| .get = param_get_int, |
| }; |
| |
| module_param_cb(ath_lpm, &bluesleep_lpm_ops, |
| &lpm_enabled, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(ath_lpm, "Enable Atheros LPM sleep Protocol"); |
| |
| static int lpm_btwrite; |
| |
| static int bluesleep_lpm_btwrite(const char *val, const struct kernel_param *kp) |
| { |
| int ret; |
| |
| ret = param_set_int(val, kp); |
| |
| if (ret) { |
| BT_ERR("HCIATH3K: lpm btwrite parameter set failed"); |
| return ret; |
| } |
| |
| BT_DBG("btwrite : %d", lpm_btwrite); |
| if (is_lpm_enabled) { |
| if (lpm_btwrite == 0) { |
| /*Setting TXEXPIRED bit to make it |
| compatible with current solution*/ |
| set_bit(BT_TXEXPIRED, &flags); |
| hsuart_serial_clock_off(bsi->uport); |
| } else if (lpm_btwrite == 1) { |
| ath_wakeup_ar3k(); |
| clear_bit(BT_TXEXPIRED, &flags); |
| } else { |
| BT_ERR("HCIATH3K invalid btwrite value"); |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| static struct kernel_param_ops bluesleep_lpm_btwrite_ops = { |
| .set = bluesleep_lpm_btwrite, |
| .get = param_get_int, |
| }; |
| |
| module_param_cb(ath_btwrite, &bluesleep_lpm_btwrite_ops, |
| &lpm_btwrite, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(ath_lpm, "Assert/Deassert the sleep"); |
| |
| static int bluesleep_populate_dt_pinfo(struct platform_device *pdev) |
| { |
| BT_DBG(""); |
| |
| if (!bsi) |
| return -ENOMEM; |
| |
| bsi->host_wake = of_get_named_gpio(pdev->dev.of_node, |
| "host-wake-gpio", 0); |
| if (bsi->host_wake < 0) { |
| BT_ERR("couldn't find host_wake gpio\n"); |
| return -ENODEV; |
| } |
| |
| bsi->ext_wake = of_get_named_gpio(pdev->dev.of_node, |
| "ext-wake-gpio", 0); |
| if (bsi->ext_wake < 0) { |
| BT_ERR("couldn't find ext_wake gpio\n"); |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| static int bluesleep_populate_pinfo(struct platform_device *pdev) |
| { |
| struct resource *res; |
| |
| BT_DBG(""); |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_IO, |
| "gpio_host_wake"); |
| if (!res) { |
| BT_ERR("couldn't find host_wake gpio\n"); |
| return -ENODEV; |
| } |
| bsi->host_wake = res->start; |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_IO, |
| "gpio_ext_wake"); |
| if (!res) { |
| BT_ERR("couldn't find ext_wake gpio\n"); |
| return -ENODEV; |
| } |
| bsi->ext_wake = res->start; |
| |
| return 0; |
| } |
| |
| static int bluesleep_probe(struct platform_device *pdev) |
| { |
| int ret; |
| |
| BT_DBG(""); |
| |
| bsi = kzalloc(sizeof(struct bluesleep_info), GFP_KERNEL); |
| if (!bsi) { |
| ret = -ENOMEM; |
| goto failed; |
| } |
| |
| if (pdev->dev.of_node) { |
| ret = bluesleep_populate_dt_pinfo(pdev); |
| if (ret < 0) { |
| BT_ERR("Failed to populate device tree info"); |
| goto free_bsi; |
| } |
| } else { |
| ret = bluesleep_populate_pinfo(pdev); |
| if (ret < 0) { |
| BT_ERR("Failed to populate device info"); |
| goto free_bsi; |
| } |
| } |
| |
| BT_DBG("host_wake_gpio: %d ext_wake_gpio: %d", |
| bsi->host_wake, bsi->ext_wake); |
| |
| bsi->host_wake_irq = platform_get_irq_byname(pdev, "host_wake"); |
| if (bsi->host_wake_irq < 0) { |
| BT_ERR("couldn't find host_wake irq\n"); |
| ret = -ENODEV; |
| goto free_bsi; |
| } |
| |
| bsi->irq_polarity = POLARITY_LOW; /* low edge (falling edge) */ |
| |
| return 0; |
| |
| free_bsi: |
| kfree(bsi); |
| bsi = NULL; |
| failed: |
| return ret; |
| } |
| |
| static int bluesleep_remove(struct platform_device *pdev) |
| { |
| kfree(bsi); |
| return 0; |
| } |
| |
| static struct platform_driver bluesleep_driver = { |
| .probe = bluesleep_probe, |
| .remove = bluesleep_remove, |
| .driver = { |
| .name = "bluesleep", |
| .owner = THIS_MODULE, |
| .of_match_table = bluesleep_match_table, |
| }, |
| }; |
| |
| int __init ath_init(void) |
| { |
| int ret; |
| |
| ret = hci_uart_register_proto(&athp); |
| |
| if (!ret) |
| BT_INFO("HCIATH3K protocol initialized"); |
| else { |
| BT_ERR("HCIATH3K protocol registration failed"); |
| return ret; |
| } |
| |
| ret = platform_driver_register(&bluesleep_driver); |
| if (ret) { |
| BT_ERR("Failed to register bluesleep driver"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| int __exit ath_deinit(void) |
| { |
| platform_driver_unregister(&bluesleep_driver); |
| |
| return hci_uart_unregister_proto(&athp); |
| } |