i2400m: Generic probe/disconnect, reset and message passing
Implements the generic probe and disconnect functions that will be
called by the USB and SDIO driver's probe/disconnect functions.
Implements the backends for the WiMAX stack's basic operations:
message passing, rfkill control and reset.
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/net/wimax/i2400m/op-rfkill.c b/drivers/net/wimax/i2400m/op-rfkill.c
new file mode 100644
index 0000000..487ec58
--- /dev/null
+++ b/drivers/net/wimax/i2400m/op-rfkill.c
@@ -0,0 +1,207 @@
+/*
+ * Intel Wireless WiMAX Connection 2400m
+ * Implement backend for the WiMAX stack rfkill support
+ *
+ *
+ * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * The WiMAX kernel stack integrates into RF-Kill and keeps the
+ * switches's status. We just need to:
+ *
+ * - report changes in the HW RF Kill switch [with
+ * wimax_rfkill_{sw,hw}_report(), which happens when we detect those
+ * indications coming through hardware reports]. We also do it on
+ * initialization to let the stack know the intial HW state.
+ *
+ * - implement indications from the stack to change the SW RF Kill
+ * switch (coming from sysfs, the wimax stack or user space).
+ */
+#include "i2400m.h"
+#include <linux/wimax/i2400m.h>
+
+
+
+#define D_SUBMODULE rfkill
+#include "debug-levels.h"
+
+/*
+ * Return true if the i2400m radio is in the requested wimax_rf_state state
+ *
+ */
+static
+int i2400m_radio_is(struct i2400m *i2400m, enum wimax_rf_state state)
+{
+ if (state == WIMAX_RF_OFF)
+ return i2400m->state == I2400M_SS_RF_OFF
+ || i2400m->state == I2400M_SS_RF_SHUTDOWN;
+ else if (state == WIMAX_RF_ON)
+ /* state == WIMAX_RF_ON */
+ return i2400m->state != I2400M_SS_RF_OFF
+ && i2400m->state != I2400M_SS_RF_SHUTDOWN;
+ else
+ BUG();
+}
+
+
+/*
+ * WiMAX stack operation: implement SW RFKill toggling
+ *
+ * @wimax_dev: device descriptor
+ * @skb: skb where the message has been received; skb->data is
+ * expected to point to the message payload.
+ * @genl_info: passed by the generic netlink layer
+ *
+ * Generic Netlink will call this function when a message is sent from
+ * userspace to change the software RF-Kill switch status.
+ *
+ * This function will set the device's sofware RF-Kill switch state to
+ * match what is requested.
+ *
+ * NOTE: the i2400m has a strict state machine; we can only set the
+ * RF-Kill switch when it is on, the HW RF-Kill is on and the
+ * device is initialized. So we ignore errors steaming from not
+ * being in the right state (-EILSEQ).
+ */
+int i2400m_op_rfkill_sw_toggle(struct wimax_dev *wimax_dev,
+ enum wimax_rf_state state)
+{
+ int result;
+ struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev);
+ struct device *dev = i2400m_dev(i2400m);
+ struct sk_buff *ack_skb;
+ struct {
+ struct i2400m_l3l4_hdr hdr;
+ struct i2400m_tlv_rf_operation sw_rf;
+ } __attribute__((packed)) *cmd;
+ char strerr[32];
+
+ d_fnstart(4, dev, "(wimax_dev %p state %d)\n", wimax_dev, state);
+
+ result = -ENOMEM;
+ cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+ if (cmd == NULL)
+ goto error_alloc;
+ cmd->hdr.type = cpu_to_le16(I2400M_MT_CMD_RF_CONTROL);
+ cmd->hdr.length = sizeof(cmd->sw_rf);
+ cmd->hdr.version = cpu_to_le16(I2400M_L3L4_VERSION);
+ cmd->sw_rf.hdr.type = cpu_to_le16(I2400M_TLV_RF_OPERATION);
+ cmd->sw_rf.hdr.length = cpu_to_le16(sizeof(cmd->sw_rf.status));
+ switch (state) {
+ case WIMAX_RF_OFF: /* RFKILL ON, radio OFF */
+ cmd->sw_rf.status = cpu_to_le32(2);
+ break;
+ case WIMAX_RF_ON: /* RFKILL OFF, radio ON */
+ cmd->sw_rf.status = cpu_to_le32(1);
+ break;
+ default:
+ BUG();
+ }
+
+ ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
+ result = PTR_ERR(ack_skb);
+ if (IS_ERR(ack_skb)) {
+ dev_err(dev, "Failed to issue 'RF Control' command: %d\n",
+ result);
+ goto error_msg_to_dev;
+ }
+ result = i2400m_msg_check_status(wimax_msg_data(ack_skb),
+ strerr, sizeof(strerr));
+ if (result < 0) {
+ dev_err(dev, "'RF Control' (0x%04x) command failed: %d - %s\n",
+ I2400M_MT_CMD_RF_CONTROL, result, strerr);
+ goto error_cmd;
+ }
+
+ /* Now we wait for the state to change to RADIO_OFF or RADIO_ON */
+ result = wait_event_timeout(
+ i2400m->state_wq, i2400m_radio_is(i2400m, state),
+ 5 * HZ);
+ if (result == 0)
+ result = -ETIMEDOUT;
+ if (result < 0)
+ dev_err(dev, "Error waiting for device to toggle RF state: "
+ "%d\n", result);
+ result = 0;
+error_cmd:
+ kfree_skb(ack_skb);
+error_msg_to_dev:
+error_alloc:
+ d_fnend(4, dev, "(wimax_dev %p state %d) = %d\n",
+ wimax_dev, state, result);
+ return result;
+}
+
+
+/*
+ * Inform the WiMAX stack of changes in the RF Kill switches reported
+ * by the device
+ *
+ * @i2400m: device descriptor
+ * @rfss: TLV for RF Switches status; already validated
+ *
+ * NOTE: the reports on RF switch status cannot be trusted
+ * or used until the device is in a state of RADIO_OFF
+ * or greater.
+ */
+void i2400m_report_tlv_rf_switches_status(
+ struct i2400m *i2400m,
+ const struct i2400m_tlv_rf_switches_status *rfss)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ enum i2400m_rf_switch_status hw, sw;
+ enum wimax_st wimax_state;
+
+ sw = le32_to_cpu(rfss->sw_rf_switch);
+ hw = le32_to_cpu(rfss->hw_rf_switch);
+
+ d_fnstart(3, dev, "(i2400m %p rfss %p [hw %u sw %u])\n",
+ i2400m, rfss, hw, sw);
+ /* We only process rw switch evens when the device has been
+ * fully initialized */
+ wimax_state = wimax_state_get(&i2400m->wimax_dev);
+ if (wimax_state < WIMAX_ST_RADIO_OFF) {
+ d_printf(3, dev, "ignoring RF switches report, state %u\n",
+ wimax_state);
+ goto out;
+ }
+ switch (sw) {
+ case I2400M_RF_SWITCH_ON: /* RF Kill disabled (radio on) */
+ wimax_report_rfkill_sw(&i2400m->wimax_dev, WIMAX_RF_ON);
+ break;
+ case I2400M_RF_SWITCH_OFF: /* RF Kill enabled (radio off) */
+ wimax_report_rfkill_sw(&i2400m->wimax_dev, WIMAX_RF_OFF);
+ break;
+ default:
+ dev_err(dev, "HW BUG? Unknown RF SW state 0x%x\n", sw);
+ }
+
+ switch (hw) {
+ case I2400M_RF_SWITCH_ON: /* RF Kill disabled (radio on) */
+ wimax_report_rfkill_hw(&i2400m->wimax_dev, WIMAX_RF_ON);
+ break;
+ case I2400M_RF_SWITCH_OFF: /* RF Kill enabled (radio off) */
+ wimax_report_rfkill_hw(&i2400m->wimax_dev, WIMAX_RF_OFF);
+ break;
+ default:
+ dev_err(dev, "HW BUG? Unknown RF HW state 0x%x\n", hw);
+ }
+out:
+ d_fnend(3, dev, "(i2400m %p rfss %p [hw %u sw %u]) = void\n",
+ i2400m, rfss, hw, sw);
+}