212 lines
6.4 KiB
C
212 lines
6.4 KiB
C
/*
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* Intel Wireless WiMAX Connection 2400m
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* Implement backend for the WiMAX stack rfkill support
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*
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*
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* Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* The WiMAX kernel stack integrates into RF-Kill and keeps the
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* switches's status. We just need to:
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*
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* - report changes in the HW RF Kill switch [with
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* wimax_rfkill_{sw,hw}_report(), which happens when we detect those
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* indications coming through hardware reports]. We also do it on
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* initialization to let the stack know the initial HW state.
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*
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* - implement indications from the stack to change the SW RF Kill
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* switch (coming from sysfs, the wimax stack or user space).
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*/
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#include "i2400m.h"
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#include <linux/wimax/i2400m.h>
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#include <linux/slab.h>
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#define D_SUBMODULE rfkill
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#include "debug-levels.h"
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/*
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* Return true if the i2400m radio is in the requested wimax_rf_state state
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*
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*/
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static
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int i2400m_radio_is(struct i2400m *i2400m, enum wimax_rf_state state)
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{
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if (state == WIMAX_RF_OFF)
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return i2400m->state == I2400M_SS_RF_OFF
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|| i2400m->state == I2400M_SS_RF_SHUTDOWN;
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else if (state == WIMAX_RF_ON)
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/* state == WIMAX_RF_ON */
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return i2400m->state != I2400M_SS_RF_OFF
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&& i2400m->state != I2400M_SS_RF_SHUTDOWN;
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else {
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BUG();
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return -EINVAL; /* shut gcc warnings on certain arches */
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}
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}
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/*
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* WiMAX stack operation: implement SW RFKill toggling
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*
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* @wimax_dev: device descriptor
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* @skb: skb where the message has been received; skb->data is
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* expected to point to the message payload.
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* @genl_info: passed by the generic netlink layer
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*
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* Generic Netlink will call this function when a message is sent from
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* userspace to change the software RF-Kill switch status.
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*
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* This function will set the device's software RF-Kill switch state to
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* match what is requested.
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*
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* NOTE: the i2400m has a strict state machine; we can only set the
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* RF-Kill switch when it is on, the HW RF-Kill is on and the
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* device is initialized. So we ignore errors steaming from not
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* being in the right state (-EILSEQ).
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*/
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int i2400m_op_rfkill_sw_toggle(struct wimax_dev *wimax_dev,
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enum wimax_rf_state state)
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{
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int result;
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struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev);
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struct device *dev = i2400m_dev(i2400m);
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struct sk_buff *ack_skb;
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struct {
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struct i2400m_l3l4_hdr hdr;
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struct i2400m_tlv_rf_operation sw_rf;
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} __packed *cmd;
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char strerr[32];
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d_fnstart(4, dev, "(wimax_dev %p state %d)\n", wimax_dev, state);
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result = -ENOMEM;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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if (cmd == NULL)
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goto error_alloc;
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cmd->hdr.type = cpu_to_le16(I2400M_MT_CMD_RF_CONTROL);
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cmd->hdr.length = sizeof(cmd->sw_rf);
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cmd->hdr.version = cpu_to_le16(I2400M_L3L4_VERSION);
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cmd->sw_rf.hdr.type = cpu_to_le16(I2400M_TLV_RF_OPERATION);
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cmd->sw_rf.hdr.length = cpu_to_le16(sizeof(cmd->sw_rf.status));
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switch (state) {
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case WIMAX_RF_OFF: /* RFKILL ON, radio OFF */
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cmd->sw_rf.status = cpu_to_le32(2);
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break;
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case WIMAX_RF_ON: /* RFKILL OFF, radio ON */
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cmd->sw_rf.status = cpu_to_le32(1);
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break;
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default:
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BUG();
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}
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ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
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result = PTR_ERR(ack_skb);
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if (IS_ERR(ack_skb)) {
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dev_err(dev, "Failed to issue 'RF Control' command: %d\n",
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result);
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goto error_msg_to_dev;
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}
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result = i2400m_msg_check_status(wimax_msg_data(ack_skb),
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strerr, sizeof(strerr));
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if (result < 0) {
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dev_err(dev, "'RF Control' (0x%04x) command failed: %d - %s\n",
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I2400M_MT_CMD_RF_CONTROL, result, strerr);
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goto error_cmd;
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}
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/* Now we wait for the state to change to RADIO_OFF or RADIO_ON */
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result = wait_event_timeout(
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i2400m->state_wq, i2400m_radio_is(i2400m, state),
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5 * HZ);
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if (result == 0)
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result = -ETIMEDOUT;
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if (result < 0)
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dev_err(dev, "Error waiting for device to toggle RF state: "
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"%d\n", result);
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result = 0;
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error_cmd:
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kfree_skb(ack_skb);
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error_msg_to_dev:
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error_alloc:
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d_fnend(4, dev, "(wimax_dev %p state %d) = %d\n",
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wimax_dev, state, result);
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kfree(cmd);
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return result;
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}
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/*
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* Inform the WiMAX stack of changes in the RF Kill switches reported
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* by the device
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*
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* @i2400m: device descriptor
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* @rfss: TLV for RF Switches status; already validated
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*
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* NOTE: the reports on RF switch status cannot be trusted
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* or used until the device is in a state of RADIO_OFF
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* or greater.
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*/
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void i2400m_report_tlv_rf_switches_status(
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struct i2400m *i2400m,
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const struct i2400m_tlv_rf_switches_status *rfss)
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{
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struct device *dev = i2400m_dev(i2400m);
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enum i2400m_rf_switch_status hw, sw;
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enum wimax_st wimax_state;
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sw = le32_to_cpu(rfss->sw_rf_switch);
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hw = le32_to_cpu(rfss->hw_rf_switch);
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d_fnstart(3, dev, "(i2400m %p rfss %p [hw %u sw %u])\n",
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i2400m, rfss, hw, sw);
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/* We only process rw switch evens when the device has been
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* fully initialized */
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wimax_state = wimax_state_get(&i2400m->wimax_dev);
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if (wimax_state < WIMAX_ST_RADIO_OFF) {
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d_printf(3, dev, "ignoring RF switches report, state %u\n",
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wimax_state);
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goto out;
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}
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switch (sw) {
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case I2400M_RF_SWITCH_ON: /* RF Kill disabled (radio on) */
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wimax_report_rfkill_sw(&i2400m->wimax_dev, WIMAX_RF_ON);
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break;
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case I2400M_RF_SWITCH_OFF: /* RF Kill enabled (radio off) */
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wimax_report_rfkill_sw(&i2400m->wimax_dev, WIMAX_RF_OFF);
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break;
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default:
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dev_err(dev, "HW BUG? Unknown RF SW state 0x%x\n", sw);
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}
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switch (hw) {
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case I2400M_RF_SWITCH_ON: /* RF Kill disabled (radio on) */
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wimax_report_rfkill_hw(&i2400m->wimax_dev, WIMAX_RF_ON);
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break;
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case I2400M_RF_SWITCH_OFF: /* RF Kill enabled (radio off) */
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wimax_report_rfkill_hw(&i2400m->wimax_dev, WIMAX_RF_OFF);
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break;
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default:
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dev_err(dev, "HW BUG? Unknown RF HW state 0x%x\n", hw);
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}
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out:
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d_fnend(3, dev, "(i2400m %p rfss %p [hw %u sw %u]) = void\n",
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i2400m, rfss, hw, sw);
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}
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