diff options
Diffstat (limited to 'drivers/net/wimax/i2400m/op-rfkill.c')
| -rw-r--r-- | drivers/net/wimax/i2400m/op-rfkill.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/net/wimax/i2400m/op-rfkill.c b/drivers/net/wimax/i2400m/op-rfkill.c new file mode 100644 index 000000000..34f81f16b --- /dev/null +++ b/drivers/net/wimax/i2400m/op-rfkill.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> + * + * 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 initial 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> +#include <linux/slab.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(); + return -EINVAL; /* shut gcc warnings on certain arches */ + } +} + + +/* + * 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 software 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; + } __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 = cpu_to_le16(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); + kfree(cmd); + 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); +} |