chrome platform changes for 5.8

* cros_ec_typec
 - Add notifier for update, and register port partner
 
 * Sensors/iio:
 - Fixes to cros_ec_sensorhub around allocation of resources, and send_sample.
 
 * Wilco EC
 - Fix to output format of h1_gpio
 
 * Misc
 - Misc fixes to appease kernel-doc and other warnings.
 - Set user space log size in chromeos_pstore
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Merge tag 'tag-chrome-platform-for-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux

Pull chrome platform updates from Benson Leung:
 "cros_ec_typec:
   - Add notifier for update, and register port partner

  Sensors/iio:
   - Fixes to cros_ec_sensorhub around allocation of resources, and
     send_sample

  Wilco EC:
   - Fix to output format of h1_gpio

  Misc:
   - Misc fixes to appease kernel-doc and other warnings
   - Set user space log size in chromeos_pstore"

* tag 'tag-chrome-platform-for-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux:
  platform/chrome: cros_usbpd_logger: Add __printf annotation to append_str()
  platform/chrome: cros_ec_i2c: Appease the kernel-doc deity
  platform/chrome: typec: Fix ret value check error
  platform/chrome: cros_ec_typec: Register port partner
  platform/chrome: cros_ec_typec: Add struct for port data
  platform/chrome: cros_ec_typec: Use notifier for updates
  platform/chrome: cros_ec_ishtp: free ishtp buffer before sending event
  platform/chrome: cros_ec_ishtp: skip old cros_ec responses
  platform/chrome: wilco_ec: Provide correct output format to 'h1_gpio' file
  platform/chrome: chromeos_pstore: set user space log size

drivers/platform/chrome/Kconfig

@@ -217,6 +217,7 @@ config CROS_EC_SYSFS
 config CROS_EC_TYPEC
 	tristate "ChromeOS EC Type-C Connector Control"
 	depends on MFD_CROS_EC_DEV && TYPEC
+	depends on CROS_USBPD_NOTIFY
 	default MFD_CROS_EC_DEV
 	help
 	  If you say Y here, you get support for accessing Type C connector

drivers/platform/chrome/chromeos_pstore.c

@@ -57,6 +57,7 @@ static struct ramoops_platform_data chromeos_ramoops_data = {
 	.record_size	= 0x40000,
 	.console_size	= 0x20000,
 	.ftrace_size	= 0x20000,
+	.pmsg_size	= 0x20000,
 	.max_reason	= KMSG_DUMP_OOPS,
 };
 

drivers/platform/chrome/cros_ec_i2c.c

@@ -16,7 +16,7 @@
 
 #include "cros_ec.h"
 
-/**
+/*
  * Request format for protocol v3
  * byte 0	0xda (EC_COMMAND_PROTOCOL_3)
  * byte 1-8	struct ec_host_request

drivers/platform/chrome/cros_ec_ishtp.c

@@ -48,7 +48,8 @@ static const guid_t cros_ish_guid =
 struct header {
 	u8 channel;
 	u8 status;
-	u8 reserved[2];
+	u8 token;
+	u8 reserved;
 } __packed;
 
 struct cros_ish_out_msg {
@@ -90,6 +91,7 @@ static DECLARE_RWSEM(init_lock);
  * data exceeds this value, we log an error.
  * @size: Actual size of data received from firmware.
  * @error: 0 for success, negative error code for a failure in process_recv().
+ * @token: Expected token for response that we are waiting on.
  * @received: Set to true on receiving a valid firmware	response to host command
  * @wait_queue: Wait queue for host to wait for firmware response.
  */
@@ -98,6 +100,7 @@ struct response_info {
 	size_t max_size;
 	size_t size;
 	int error;
+	u8 token;
 	bool received;
 	wait_queue_head_t wait_queue;
 };
@@ -162,6 +165,7 @@ static int ish_send(struct ishtp_cl_data *client_data,
 		    u8 *out_msg, size_t out_size,
 		    u8 *in_msg, size_t in_size)
 {
+	static u8 next_token;
 	int rv;
 	struct header *out_hdr = (struct header *)out_msg;
 	struct ishtp_cl *cros_ish_cl = client_data->cros_ish_cl;
@@ -174,8 +178,11 @@ static int ish_send(struct ishtp_cl_data *client_data,
 	client_data->response.data = in_msg;
 	client_data->response.max_size = in_size;
 	client_data->response.error = 0;
+	client_data->response.token = next_token++;
 	client_data->response.received = false;
 
+	out_hdr->token = client_data->response.token;
+
 	rv = ishtp_cl_send(cros_ish_cl, out_msg, out_size);
 	if (rv) {
 		dev_err(cl_data_to_dev(client_data),
@@ -249,6 +256,19 @@ static void process_recv(struct ishtp_cl *cros_ish_cl,
 
 	switch (in_msg->hdr.channel) {
 	case CROS_EC_COMMAND:
+		if (client_data->response.received) {
+			dev_err(dev,
+				"Previous firmware message not yet processed\n");
+			goto end_error;
+		}
+
+		if (client_data->response.token != in_msg->hdr.token) {
+			dev_err_ratelimited(dev,
+					    "Dropping old response token %d\n",
+					    in_msg->hdr.token);
+			goto end_error;
+		}
+
 		/* Sanity check */
 		if (!client_data->response.data) {
 			dev_err(dev,
@@ -257,13 +277,6 @@ static void process_recv(struct ishtp_cl *cros_ish_cl,
 			goto error_wake_up;
 		}
 
-		if (client_data->response.received) {
-			dev_err(dev,
-				"Previous firmware message not yet processed\n");
-			client_data->response.error = -EINVAL;
-			goto error_wake_up;
-		}
-
 		if (data_len > client_data->response.max_size) {
 			dev_err(dev,
 				"Received buffer size %zu is larger than allocated buffer %zu\n",
@@ -289,21 +302,28 @@ static void process_recv(struct ishtp_cl *cros_ish_cl,
 		memcpy(client_data->response.data,
 		       rb_in_proc->buffer.data, data_len);
 
+error_wake_up:
+		/* Free the buffer since we copied data or didn't need it */
+		ishtp_cl_io_rb_recycle(rb_in_proc);
+		rb_in_proc = NULL;
+
 		/* Set flag before waking up the caller */
 		client_data->response.received = true;
-error_wake_up:
+
 		/* Wake the calling thread */
 		wake_up_interruptible(&client_data->response.wait_queue);
 
 		break;
 
 	case CROS_MKBP_EVENT:
+		/* Free the buffer. This is just an event without data */
+		ishtp_cl_io_rb_recycle(rb_in_proc);
+		rb_in_proc = NULL;
 		/*
 		 * Set timestamp from beginning of function since we actually
 		 * got an incoming MKBP event
 		 */
 		client_data->ec_dev->last_event_time = timestamp;
-		/* The event system doesn't send any data in buffer */
 		schedule_work(&client_data->work_ec_evt);
 
 		break;
@@ -313,8 +333,9 @@ error_wake_up:
 	}
 
 end_error:
-	/* Free the buffer */
-	ishtp_cl_io_rb_recycle(rb_in_proc);
+	/* Free the buffer if we already haven't */
+	if (rb_in_proc)
+		ishtp_cl_io_rb_recycle(rb_in_proc);
 
 	up_read(&init_lock);
 }

drivers/platform/chrome/cros_ec_typec.c

@@ -11,11 +11,22 @@
 #include <linux/of.h>
 #include <linux/platform_data/cros_ec_commands.h>
 #include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_data/cros_usbpd_notify.h>
 #include <linux/platform_device.h>
 #include <linux/usb/typec.h>
 
 #define DRV_NAME "cros-ec-typec"
 
+/* Per port data. */
+struct cros_typec_port {
+	struct typec_port *port;
+	/* Initial capabilities for the port. */
+	struct typec_capability caps;
+	struct typec_partner *partner;
+	/* Port partner PD identity info. */
+	struct usb_pd_identity p_identity;
+};
+
 /* Platform-specific data for the Chrome OS EC Type C controller. */
 struct cros_typec_data {
 	struct device *dev;
@@ -23,9 +34,8 @@ struct cros_typec_data {
 	int num_ports;
 	unsigned int cmd_ver;
 	/* Array of ports, indexed by port number. */
-	struct typec_port *ports[EC_USB_PD_MAX_PORTS];
-	/* Initial capabilities for each port. */
-	struct typec_capability *caps[EC_USB_PD_MAX_PORTS];
+	struct cros_typec_port *ports[EC_USB_PD_MAX_PORTS];
+	struct notifier_block nb;
 };
 
 static int cros_typec_parse_port_props(struct typec_capability *cap,
@@ -74,14 +84,25 @@ static int cros_typec_parse_port_props(struct typec_capability *cap,
 	return 0;
 }
 
+static void cros_unregister_ports(struct cros_typec_data *typec)
+{
+	int i;
+
+	for (i = 0; i < typec->num_ports; i++) {
+		if (!typec->ports[i])
+			continue;
+		typec_unregister_port(typec->ports[i]->port);
+	}
+}
+
 static int cros_typec_init_ports(struct cros_typec_data *typec)
 {
 	struct device *dev = typec->dev;
 	struct typec_capability *cap;
 	struct fwnode_handle *fwnode;
+	struct cros_typec_port *cros_port;
 	const char *port_prop;
 	int ret;
-	int i;
 	int nports;
 	u32 port_num = 0;
 
@@ -113,22 +134,23 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
 
 		dev_dbg(dev, "Registering port %d\n", port_num);
 
-		cap = devm_kzalloc(dev, sizeof(*cap), GFP_KERNEL);
-		if (!cap) {
+		cros_port = devm_kzalloc(dev, sizeof(*cros_port), GFP_KERNEL);
+		if (!cros_port) {
 			ret = -ENOMEM;
 			goto unregister_ports;
 		}
 
-		typec->caps[port_num] = cap;
+		typec->ports[port_num] = cros_port;
+		cap = &cros_port->caps;
 
 		ret = cros_typec_parse_port_props(cap, fwnode, dev);
 		if (ret < 0)
 			goto unregister_ports;
 
-		typec->ports[port_num] = typec_register_port(dev, cap);
-		if (IS_ERR(typec->ports[port_num])) {
+		cros_port->port = typec_register_port(dev, cap);
+		if (IS_ERR(cros_port->port)) {
 			dev_err(dev, "Failed to register port %d\n", port_num);
-			ret = PTR_ERR(typec->ports[port_num]);
+			ret = PTR_ERR(cros_port->port);
 			goto unregister_ports;
 		}
 	}
@@ -136,8 +158,7 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
 	return 0;
 
 unregister_ports:
-	for (i = 0; i < typec->num_ports; i++)
-		typec_unregister_port(typec->ports[i]);
+	cros_unregister_ports(typec);
 	return ret;
 }
 
@@ -172,10 +193,34 @@ static int cros_typec_ec_command(struct cros_typec_data *typec,
 	return ret;
 }
 
+static int cros_typec_add_partner(struct cros_typec_data *typec, int port_num,
+				  bool pd_en)
+{
+	struct cros_typec_port *port = typec->ports[port_num];
+	struct typec_partner_desc p_desc = {
+		.usb_pd = pd_en,
+	};
+	int ret = 0;
+
+	/*
+	 * Fill an initial PD identity, which will then be updated with info
+	 * from the EC.
+	 */
+	p_desc.identity = &port->p_identity;
+
+	port->partner = typec_register_partner(port->port, &p_desc);
+	if (IS_ERR(port->partner)) {
+		ret = PTR_ERR(port->partner);
+		port->partner = NULL;
+	}
+
+	return ret;
+}
+
 static void cros_typec_set_port_params_v0(struct cros_typec_data *typec,
 		int port_num, struct ec_response_usb_pd_control *resp)
 {
-	struct typec_port *port = typec->ports[port_num];
+	struct typec_port *port = typec->ports[port_num]->port;
 	enum typec_orientation polarity;
 
 	if (!resp->enabled)
@@ -192,8 +237,10 @@ static void cros_typec_set_port_params_v0(struct cros_typec_data *typec,
 static void cros_typec_set_port_params_v1(struct cros_typec_data *typec,
 		int port_num, struct ec_response_usb_pd_control_v1 *resp)
 {
-	struct typec_port *port = typec->ports[port_num];
+	struct typec_port *port = typec->ports[port_num]->port;
 	enum typec_orientation polarity;
+	bool pd_en;
+	int ret;
 
 	if (!(resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
 		polarity = TYPEC_ORIENTATION_NONE;
@@ -208,6 +255,25 @@ static void cros_typec_set_port_params_v1(struct cros_typec_data *typec,
 			TYPEC_SOURCE : TYPEC_SINK);
 	typec_set_vconn_role(port, resp->role & PD_CTRL_RESP_ROLE_VCONN ?
 			TYPEC_SOURCE : TYPEC_SINK);
+
+	/* Register/remove partners when a connect/disconnect occurs. */
+	if (resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED) {
+		if (typec->ports[port_num]->partner)
+			return;
+
+		pd_en = resp->enabled & PD_CTRL_RESP_ENABLED_PD_CAPABLE;
+		ret = cros_typec_add_partner(typec, port_num, pd_en);
+		if (ret)
+			dev_warn(typec->dev,
+				 "Failed to register partner on port: %d\n",
+				 port_num);
+	} else {
+		if (!typec->ports[port_num]->partner)
+			return;
+
+		typec_unregister_partner(typec->ports[port_num]->partner);
+		typec->ports[port_num]->partner = NULL;
+	}
 }
 
 static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
@@ -272,6 +338,22 @@ static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
 	return 0;
 }
 
+static int cros_ec_typec_event(struct notifier_block *nb,
+			       unsigned long host_event, void *_notify)
+{
+	struct cros_typec_data *typec = container_of(nb, struct cros_typec_data,
+						     nb);
+	int ret, i;
+
+	for (i = 0; i < typec->num_ports; i++) {
+		ret = cros_typec_port_update(typec, i);
+		if (ret < 0)
+			dev_warn(typec->dev, "Update failed for port: %d\n", i);
+	}
+
+	return NOTIFY_OK;
+}
+
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id cros_typec_acpi_id[] = {
 	{ "GOOG0014", 0 },
@@ -332,12 +414,15 @@ static int cros_typec_probe(struct platform_device *pdev)
 			goto unregister_ports;
 	}
 
+	typec->nb.notifier_call = cros_ec_typec_event;
+	ret = cros_usbpd_register_notify(&typec->nb);
+	if (ret < 0)
+		goto unregister_ports;
+
 	return 0;
 
 unregister_ports:
-	for (i = 0; i < typec->num_ports; i++)
-		if (typec->ports[i])
-			typec_unregister_port(typec->ports[i]);
+	cros_unregister_ports(typec);
 	return ret;
 }
 

drivers/platform/chrome/cros_usbpd_logger.c

@@ -46,6 +46,7 @@ static const char * const fault_names[] = {
 	"---", "OCP", "fast OCP", "OVP", "Discharge"
 };
 
+__printf(3, 4)
 static int append_str(char *buf, int pos, const char *fmt, ...)
 {
 	va_list args;

drivers/platform/chrome/wilco_ec/debugfs.c

@@ -208,7 +208,12 @@ static int send_ec_cmd(struct wilco_ec_device *ec, u8 sub_cmd, u8 *out_val)
  */
 static int h1_gpio_get(void *arg, u64 *val)
 {
-	return send_ec_cmd(arg, SUB_CMD_H1_GPIO, (u8 *)val);
+	int ret;
+
+	ret = send_ec_cmd(arg, SUB_CMD_H1_GPIO, (u8 *)val);
+	if (ret == 0)
+		*val &= 0xFF;
+	return ret;
 }
 
 DEFINE_DEBUGFS_ATTRIBUTE(fops_h1_gpio, h1_gpio_get, NULL, "0x%02llx\n");