i2c-cht-wc: Add device-properties for fusb302 integration

Add device-properties to make the bq24292i charger connected to
the bus get its input-current-limit from the fusb302 Type-C port
controller which is used on boards with the cht-wc PMIC,
as well as regulator_init_data for the 5V boost converter on
the bq24292i.

Since this means we now hook-up the bq24292i to the fusb302 Type-C port
controller add a check for the ACPI device which instantiates the fusb302.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

2 files changed, 49 insertions, 7 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 45a3f3ca29b3..009345d8f49d 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -198,6 +198,11 @@ config I2C_CHT_WC
           SMBus controller found in the Intel Cherry Trail Whiskey Cove PMIC
           found on some Intel Cherry Trail systems.
 
+          Note this controller is hooked up to a TI bq24292i charger-IC,
+          combined with a FUSB302 Type-C port-controller as such it is advised
+          to also select CONFIG_CHARGER_BQ24190=m and CONFIG_TYPEC_FUSB302=m
+          (the fusb302 driver currently is in drivers/staging).
+
 config I2C_NFORCE2
         tristate "Nvidia nForce2, nForce3 and nForce4"
         depends on PCI
diff --git a/drivers/i2c/busses/i2c-cht-wc.c b/drivers/i2c/busses/i2c-cht-wc.c
index 190bbbc7bfee..0d05dadb2dc5 100644
--- a/drivers/i2c/busses/i2c-cht-wc.c
+++ b/drivers/i2c/busses/i2c-cht-wc.c
@@ -16,6 +16,7 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/acpi.h>
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
@@ -25,6 +26,7 @@
 #include <linux/mfd/intel_soc_pmic.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/power/bq24190_charger.h>
 #include <linux/slab.h>
 
 #define CHT_WC_I2C_CTRL                 0x5e24
@@ -232,13 +234,35 @@ static const struct irq_chip cht_wc_i2c_irq_chip = {
         .name                   = "cht_wc_ext_chrg_irq_chip",
 };
 
+static const char * const bq24190_suppliers[] = { "fusb302-typec-source" };
+
 static const struct property_entry bq24190_props[] = {
-        PROPERTY_ENTRY_STRING("extcon-name", "cht_wcove_pwrsrc"),
+        PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq24190_suppliers),
         PROPERTY_ENTRY_BOOL("omit-battery-class"),
         PROPERTY_ENTRY_BOOL("disable-reset"),
         { }
 };
 
+static struct regulator_consumer_supply fusb302_consumer = {
+        .supply = "vbus",
+        /* Must match fusb302 dev_name in intel_cht_int33fe.c */
+        .dev_name = "i2c-fusb302",
+};
+
+static const struct regulator_init_data bq24190_vbus_init_data = {
+        .constraints = {
+                /* The name is used in intel_cht_int33fe.c do not change. */
+                .name = "cht_wc_usb_typec_vbus",
+                .valid_ops_mask = REGULATOR_CHANGE_STATUS,
+        },
+        .consumer_supplies = &fusb302_consumer,
+        .num_consumer_supplies = 1,
+};
+
+static struct bq24190_platform_data bq24190_pdata = {
+        .regulator_init_data = &bq24190_vbus_init_data,
+};
+
 static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
 {
         struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
@@ -246,7 +270,9 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
         struct i2c_board_info board_info = {
                 .type = "bq24190",
                 .addr = 0x6b,
+                .dev_name = "bq24190",
                 .properties = bq24190_props,
+                .platform_data = &bq24190_pdata,
         };
         int ret, reg, irq;
 
@@ -314,11 +340,21 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
         if (ret)
                 goto remove_irq_domain;
 
-        board_info.irq = adap->client_irq;
-        adap->client = i2c_new_device(&adap->adapter, &board_info);
-        if (!adap->client) {
-                ret = -ENOMEM;
-                goto del_adapter;
+        /*
+         * Normally the Whiskey Cove PMIC is paired with a TI bq24292i charger,
+         * connected to this i2c bus, and a max17047 fuel-gauge and a fusb302
+         * USB Type-C controller connected to another i2c bus. In this setup
+         * the max17047 and fusb302 devices are enumerated through an INT33FE
+         * ACPI device. If this device is present register an i2c-client for
+         * the TI bq24292i charger.
+         */
+        if (acpi_dev_present("INT33FE", NULL, -1)) {
+                board_info.irq = adap->client_irq;
+                adap->client = i2c_new_device(&adap->adapter, &board_info);
+                if (!adap->client) {
+                        ret = -ENOMEM;
+                        goto del_adapter;
+                }
         }
 
         platform_set_drvdata(pdev, adap);
@@ -335,7 +371,8 @@ static int cht_wc_i2c_adap_i2c_remove(struct platform_device *pdev)
 {
         struct cht_wc_i2c_adap *adap = platform_get_drvdata(pdev);
 
-        i2c_unregister_device(adap->client);
+        if (adap->client)
+                i2c_unregister_device(adap->client);
         i2c_del_adapter(&adap->adapter);
         irq_domain_remove(adap->irq_domain);