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-rw-r--r--drivers/misc/ti-st/st_ll.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/misc/ti-st/st_ll.c b/drivers/misc/ti-st/st_ll.c
new file mode 100644
index 0000000000..07406140d2
--- /dev/null
+++ b/drivers/misc/ti-st/st_ll.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared Transport driver
+ * HCI-LL module responsible for TI proprietary HCI_LL protocol
+ * Copyright (C) 2009-2010 Texas Instruments
+ * Author: Pavan Savoy <pavan_savoy@ti.com>
+ */
+
+#define pr_fmt(fmt) "(stll) :" fmt
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/ti_wilink_st.h>
+
+/**********************************************************************/
+/* internal functions */
+static void send_ll_cmd(struct st_data_s *st_data,
+ unsigned char cmd)
+{
+
+ pr_debug("%s: writing %x", __func__, cmd);
+ st_int_write(st_data, &cmd, 1);
+ return;
+}
+
+static void ll_device_want_to_sleep(struct st_data_s *st_data)
+{
+ struct kim_data_s *kim_data;
+ struct ti_st_plat_data *pdata;
+
+ pr_debug("%s", __func__);
+ /* sanity check */
+ if (st_data->ll_state != ST_LL_AWAKE)
+ pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"
+ "in state %ld", st_data->ll_state);
+
+ send_ll_cmd(st_data, LL_SLEEP_ACK);
+ /* update state */
+ st_data->ll_state = ST_LL_ASLEEP;
+
+ /* communicate to platform about chip asleep */
+ kim_data = st_data->kim_data;
+ pdata = kim_data->kim_pdev->dev.platform_data;
+ if (pdata->chip_asleep)
+ pdata->chip_asleep(NULL);
+}
+
+static void ll_device_want_to_wakeup(struct st_data_s *st_data)
+{
+ struct kim_data_s *kim_data;
+ struct ti_st_plat_data *pdata;
+
+ /* diff actions in diff states */
+ switch (st_data->ll_state) {
+ case ST_LL_ASLEEP:
+ send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */
+ break;
+ case ST_LL_ASLEEP_TO_AWAKE:
+ /* duplicate wake_ind */
+ pr_err("duplicate wake_ind while waiting for Wake ack");
+ break;
+ case ST_LL_AWAKE:
+ /* duplicate wake_ind */
+ pr_err("duplicate wake_ind already AWAKE");
+ break;
+ case ST_LL_AWAKE_TO_ASLEEP:
+ /* duplicate wake_ind */
+ pr_err("duplicate wake_ind");
+ break;
+ }
+ /* update state */
+ st_data->ll_state = ST_LL_AWAKE;
+
+ /* communicate to platform about chip wakeup */
+ kim_data = st_data->kim_data;
+ pdata = kim_data->kim_pdev->dev.platform_data;
+ if (pdata->chip_awake)
+ pdata->chip_awake(NULL);
+}
+
+/**********************************************************************/
+/* functions invoked by ST Core */
+
+/* called when ST Core wants to
+ * enable ST LL */
+void st_ll_enable(struct st_data_s *ll)
+{
+ ll->ll_state = ST_LL_AWAKE;
+}
+
+/* called when ST Core /local module wants to
+ * disable ST LL */
+void st_ll_disable(struct st_data_s *ll)
+{
+ ll->ll_state = ST_LL_INVALID;
+}
+
+/* called when ST Core wants to update the state */
+void st_ll_wakeup(struct st_data_s *ll)
+{
+ if (likely(ll->ll_state != ST_LL_AWAKE)) {
+ send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */
+ ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;
+ } else {
+ /* don't send the duplicate wake_indication */
+ pr_err(" Chip already AWAKE ");
+ }
+}
+
+/* called when ST Core wants the state */
+unsigned long st_ll_getstate(struct st_data_s *ll)
+{
+ pr_debug(" returning state %ld", ll->ll_state);
+ return ll->ll_state;
+}
+
+/* called from ST Core, when a PM related packet arrives */
+unsigned long st_ll_sleep_state(struct st_data_s *st_data,
+ unsigned char cmd)
+{
+ switch (cmd) {
+ case LL_SLEEP_IND: /* sleep ind */
+ pr_debug("sleep indication recvd");
+ ll_device_want_to_sleep(st_data);
+ break;
+ case LL_SLEEP_ACK: /* sleep ack */
+ pr_err("sleep ack rcvd: host shouldn't");
+ break;
+ case LL_WAKE_UP_IND: /* wake ind */
+ pr_debug("wake indication recvd");
+ ll_device_want_to_wakeup(st_data);
+ break;
+ case LL_WAKE_UP_ACK: /* wake ack */
+ pr_debug("wake ack rcvd");
+ st_data->ll_state = ST_LL_AWAKE;
+ break;
+ default:
+ pr_err(" unknown input/state ");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* Called from ST CORE to initialize ST LL */
+long st_ll_init(struct st_data_s *ll)
+{
+ /* set state to invalid */
+ ll->ll_state = ST_LL_INVALID;
+ return 0;
+}
+
+/* Called from ST CORE to de-initialize ST LL */
+long st_ll_deinit(struct st_data_s *ll)
+{
+ return 0;
+}