i2c: icy: Add LTC2990 present on 2019 board revision (724041ae) · Commits · 戴 / test

drivers/i2c/busses/Kconfig

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1320,6 +1320,9 @@ config I2C_ICY
	This support is also available as a module. If so, the module		This support is also available as a module. If so, the module
	will be called i2c-icy.		will be called i2c-icy.

			If you have a 2019 edition board with an LTC2990 sensor at address
			0x4c, loading the module 'ltc2990' is sufficient to enable it.

	config I2C_MLXCPLD		config I2C_MLXCPLD
	tristate "Mellanox I2C driver"		tristate "Mellanox I2C driver"
	depends on X86_64		depends on X86_64

drivers/i2c/busses/i2c-icy.c

+57 −0

Original line number	Original line	Diff line number	Diff line
	@@ -53,6 +53,8 @@ struct icy_i2c {

	void __iomem *reg_s0;		void __iomem *reg_s0;
	void __iomem *reg_s1;		void __iomem *reg_s1;
			struct fwnode_handle *ltc2990_fwnode;
			struct i2c_client *ltc2990_client;
	};		};

	/*		/*
	@@ -94,11 +96,34 @@ static void icy_pcf_waitforpin(void *data)
	/*		/*
	* Main i2c-icy part		* Main i2c-icy part
	*/		*/
			static unsigned short const icy_ltc2990_addresses[] = {
			0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END
			};

			/*
			* Additional sensors exposed once this property is applied:
			*
			* in1 will be the voltage of the 5V rail, divided by 2.
			* in2 will be the voltage of the 12V rail, divided by 4.
			* temp3 will be measured using a PCB loop next the chip.
			*/
			static const u32 icy_ltc2990_meas_mode[] = {0, 3};

			static const struct property_entry icy_ltc2990_props[] = {
			PROPERTY_ENTRY_U32_ARRAY("lltc,meas-mode", icy_ltc2990_meas_mode),
			{ }
			};

	static int icy_probe(struct zorro_dev *z,		static int icy_probe(struct zorro_dev *z,
	const struct zorro_device_id *ent)		const struct zorro_device_id *ent)
	{		{
	struct icy_i2c *i2c;		struct icy_i2c *i2c;
	struct i2c_algo_pcf_data *algo_data;		struct i2c_algo_pcf_data *algo_data;
			struct fwnode_handle *new_fwnode;
			struct i2c_board_info ltc2990_info = {
			.type = "ltc2990",
			.addr = 0x4c,
			};

	i2c = devm_kzalloc(&z->dev, sizeof(*i2c), GFP_KERNEL);		i2c = devm_kzalloc(&z->dev, sizeof(*i2c), GFP_KERNEL);
	if (!i2c)		if (!i2c)
	@@ -140,6 +165,35 @@ static int icy_probe(struct zorro_dev *z,
	dev_info(&z->dev, "ICY I2C controller at %pa, IRQ not implemented\n",		dev_info(&z->dev, "ICY I2C controller at %pa, IRQ not implemented\n",
	&z->resource.start);		&z->resource.start);

			/*
			* The 2019 a1k.org PCBs have an LTC2990 at 0x4c, so start
			* it automatically once ltc2990 is modprobed.
			*
			* in0 is the voltage of the internal 5V power supply.
			* temp1 is the temperature inside the chip.
			*
			* See property_entry above for in1, in2, temp3.
			*/
			new_fwnode = fwnode_create_software_node(icy_ltc2990_props, NULL);
			if (IS_ERR(new_fwnode)) {
			dev_info(&z->dev, "Failed to create fwnode for LTC2990, error: %ld\n",
			PTR_ERR(new_fwnode));
			} else {
			/*
			* Store the fwnode so we can destroy it on .remove().
			* Only store it on success, as fwnode_remove_software_node()
			* is NULL safe, but not PTR_ERR safe.
			*/
			i2c->ltc2990_fwnode = new_fwnode;
			ltc2990_info.fwnode = new_fwnode;

			i2c->ltc2990_client =
			i2c_new_probed_device(&i2c->adapter,
			&ltc2990_info,
			icy_ltc2990_addresses,
			NULL);
			}

	return 0;		return 0;
	}		}

	@@ -147,6 +201,9 @@ static void icy_remove(struct zorro_dev *z)
	{		{
	struct icy_i2c *i2c = dev_get_drvdata(&z->dev);		struct icy_i2c *i2c = dev_get_drvdata(&z->dev);

			i2c_unregister_device(i2c->ltc2990_client);
			fwnode_remove_software_node(i2c->ltc2990_fwnode);

	i2c_del_adapter(&i2c->adapter);		i2c_del_adapter(&i2c->adapter);
	}		}

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