mfd: Add STw481x driver (60013b94) · Commits · 戴 / test

drivers/mfd/Kconfig

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		@@ -1151,6 +1151,16 @@ config MFD_WM8994
		core support for the WM8994, in order to use the actual
		functionaltiy of the device other drivers must be enabled.

		config MFD_STW481X
		bool "Support for ST Microelectronics STw481x"
		depends on I2C && ARCH_NOMADIK
		select REGMAP_I2C
		select MFD_CORE
		help
		Select this option to enable the STw481x chip driver used
		in various ST Microelectronics and ST-Ericsson embedded
		Nomadik series.

		endmenu
		endif

drivers/mfd/Makefile

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		@@ -162,3 +162,4 @@ obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o
		obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o vexpress-sysreg.o
		obj-$(CONFIG_MFD_RETU) += retu-mfd.o
		obj-$(CONFIG_MFD_AS3711) += as3711.o
		obj-$(CONFIG_MFD_STW481X) += stw481x.o

drivers/mfd/stw481x.c

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		/*
		* Core driver for STw4810/STw4811
		*
		* Copyright (C) 2013 ST-Ericsson SA
		* Written on behalf of Linaro for ST-Ericsson
		*
		* Author: Linus Walleij <linus.walleij@linaro.org>
		*
		* License terms: GNU General Public License (GPL) version 2
		*/

		#include <linux/err.h>
		#include <linux/i2c.h>
		#include <linux/init.h>
		#include <linux/mfd/core.h>
		#include <linux/mfd/stw481x.h>
		#include <linux/module.h>
		#include <linux/regmap.h>
		#include <linux/spinlock.h>
		#include <linux/slab.h>

		/*
		* This driver can only access the non-USB portions of STw4811, the register
		* range 0x00-0x10 dealing with USB is bound to the two special I2C pins used
		* for USB control.
		*/

		/* Registers inside the power control address space */
		#define STW_PC_VCORE_SEL 0x05U
		#define STW_PC_VAUX_SEL 0x06U
		#define STW_PC_VPLL_SEL 0x07U

		/**
		* stw481x_get_pctl_reg() - get a power control register
		* @stw481x: handle to the stw481x chip
		* @reg: power control register to fetch
		*
		* The power control registers is a set of one-time-programmable registers
		* in its own register space, accessed by writing addess bits to these
		* two registers: bits 7,6,5 of PCTL_REG_LO corresponds to the 3 LSBs of
		* the address and bits 8,9 of PCTL_REG_HI corresponds to the 2 MSBs of
		* the address, forming an address space of 5 bits, i.e. 32 registers
		* 0x00 ... 0x1f can be obtained.
		*/
		static int stw481x_get_pctl_reg(struct stw481x *stw481x, u8 reg)
		{
		u8 msb = (reg >> 3) & 0x03;
		u8 lsb = (reg << 5) & 0xe0;
		unsigned int val;
		u8 vrfy;
		int ret;

		ret = regmap_write(stw481x->map, STW_PCTL_REG_HI, msb);
		if (ret)
		return ret;
		ret = regmap_write(stw481x->map, STW_PCTL_REG_LO, lsb);
		if (ret)
		return ret;
		ret = regmap_read(stw481x->map, STW_PCTL_REG_HI, &val);
		if (ret)
		return ret;
		vrfy = (val & 0x03) << 3;
		ret = regmap_read(stw481x->map, STW_PCTL_REG_LO, &val);
		if (ret)
		return ret;
		vrfy \|= ((val >> 5) & 0x07);
		if (vrfy != reg)
		return -EIO;
		return (val >> 1) & 0x0f;
		}

		static int stw481x_startup(struct stw481x *stw481x)
		{
		/* Voltages multiplied by 100 */
		u8 vcore_val[] = { 100, 105, 110, 115, 120, 122, 124, 126, 128,
		130, 132, 134, 136, 138, 140, 145 };
		u8 vpll_val[] = { 105, 120, 130, 180 };
		u8 vaux_val[] = { 15, 18, 25, 28 };
		u8 vcore;
		u8 vcore_slp;
		u8 vpll;
		u8 vaux;
		bool vaux_en;
		bool it_warn;
		int ret;
		unsigned int val;

		ret = regmap_read(stw481x->map, STW_CONF1, &val);
		if (ret)
		return ret;
		vaux_en = !!(val & STW_CONF1_PDN_VAUX);
		it_warn = !!(val & STW_CONF1_IT_WARN);

		dev_info(&stw481x->client->dev, "voltages %s\n",
		(val & STW_CONF1_V_MONITORING) ? "OK" : "LOW");
		dev_info(&stw481x->client->dev, "MMC level shifter %s\n",
		(val & STW_CONF1_MMC_LS_STATUS) ? "high impedance" : "ON");
		dev_info(&stw481x->client->dev, "VMMC: %s\n",
		(val & STW_CONF1_PDN_VMMC) ? "ON" : "disabled");

		dev_info(&stw481x->client->dev, "STw481x power control registers:\n");

		ret = stw481x_get_pctl_reg(stw481x, STW_PC_VCORE_SEL);
		if (ret < 0)
		return ret;
		vcore = ret & 0x0f;

		ret = stw481x_get_pctl_reg(stw481x, STW_PC_VAUX_SEL);
		if (ret < 0)
		return ret;
		vaux = (ret >> 2) & 3;
		vpll = (ret >> 4) & 1; /* Save bit 4 */

		ret = stw481x_get_pctl_reg(stw481x, STW_PC_VPLL_SEL);
		if (ret < 0)
		return ret;
		vpll \|= (ret >> 1) & 2;

		dev_info(&stw481x->client->dev, "VCORE: %u.%uV %s\n",
		vcore_val[vcore] / 100, vcore_val[vcore] % 100,
		(ret & 4) ? "ON" : "OFF");

		dev_info(&stw481x->client->dev, "VPLL: %u.%uV %s\n",
		vpll_val[vpll] / 100, vpll_val[vpll] % 100,
		(ret & 0x10) ? "ON" : "OFF");

		dev_info(&stw481x->client->dev, "VAUX: %u.%uV %s\n",
		vaux_val[vaux] / 10, vaux_val[vaux] % 10,
		vaux_en ? "ON" : "OFF");

		ret = regmap_read(stw481x->map, STW_CONF2, &val);
		if (ret)
		return ret;

		dev_info(&stw481x->client->dev, "TWARN: %s threshold, %s\n",
		it_warn ? "below" : "above",
		(val & STW_CONF2_MASK_TWARN) ?
		"enabled" : "mask through VDDOK");
		dev_info(&stw481x->client->dev, "VMMC: %s\n",
		(val & STW_CONF2_VMMC_EXT) ? "internal" : "external");
		dev_info(&stw481x->client->dev, "IT WAKE UP: %s\n",
		(val & STW_CONF2_MASK_IT_WAKE_UP) ? "enabled" : "masked");
		dev_info(&stw481x->client->dev, "GPO1: %s\n",
		(val & STW_CONF2_GPO1) ? "low" : "high impedance");
		dev_info(&stw481x->client->dev, "GPO2: %s\n",
		(val & STW_CONF2_GPO2) ? "low" : "high impedance");

		ret = regmap_read(stw481x->map, STW_VCORE_SLEEP, &val);
		if (ret)
		return ret;
		vcore_slp = val & 0x0f;
		dev_info(&stw481x->client->dev, "VCORE SLEEP: %u.%uV\n",
		vcore_val[vcore_slp] / 100, vcore_val[vcore_slp] % 100);

		return 0;
		}

		/*
		* MFD cells - we have one cell which is selected operation
		* mode, and we always have a GPIO cell.
		*/
		static struct mfd_cell stw481x_cells[] = {
		{
		.of_compatible = "st,stw481x-vmmc",
		.name = "stw481x-vmmc-regulator",
		.id = -1,
		},
		};

		const struct regmap_config stw481x_regmap_config = {
		.reg_bits = 8,
		.val_bits = 8,
		};

		static int stw481x_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct stw481x *stw481x;
		int ret;
		int i;

		stw481x = devm_kzalloc(&client->dev, sizeof(*stw481x), GFP_KERNEL);
		if (!stw481x)
		return -ENOMEM;

		i2c_set_clientdata(client, stw481x);
		stw481x->client = client;
		stw481x->map = devm_regmap_init_i2c(client, &stw481x_regmap_config);

		ret = stw481x_startup(stw481x);
		if (ret) {
		dev_err(&client->dev, "chip initialization failed\n");
		return ret;
		}

		/* Set up and register the platform devices. */
		for (i = 0; i < ARRAY_SIZE(stw481x_cells); i++) {
		/* One state holder for all drivers, this is simple */
		stw481x_cells[i].platform_data = stw481x;
		stw481x_cells[i].pdata_size = sizeof(*stw481x);
		}

		ret = mfd_add_devices(&client->dev, 0, stw481x_cells,
		ARRAY_SIZE(stw481x_cells), NULL, 0, NULL);
		if (ret)
		return ret;

		dev_info(&client->dev, "initialized STw481x device\n");

		return ret;
		}

		static int stw481x_remove(struct i2c_client *client)
		{
		mfd_remove_devices(&client->dev);
		return 0;
		}

		/*
		* This ID table is completely unused, as this is a pure
		* device-tree probed driver, but it has to be here due to
		* the structure of the I2C core.
		*/
		static const struct i2c_device_id stw481x_id[] = {
		{ "stw481x", 0 },
		{ },
		};

		static const struct of_device_id stw481x_match[] = {
		{ .compatible = "st,stw4810", },
		{ .compatible = "st,stw4811", },
		{ },
		};
		MODULE_DEVICE_TABLE(of, stw481x_match);

		static struct i2c_driver stw481x_driver = {
		.driver = {
		.name = "stw481x",
		.of_match_table = stw481x_match,
		},
		.probe = stw481x_probe,
		.remove = stw481x_remove,
		.id_table = stw481x_id,
		};

		module_i2c_driver(stw481x_driver);

		MODULE_AUTHOR("Linus Walleij");
		MODULE_DESCRIPTION("STw481x PMIC driver");
		MODULE_LICENSE("GPL v2");

include/linux/mfd/stw481x.h

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		/*
		* Copyright (C) 2011 ST-Ericsson SA
		* Written on behalf of Linaro for ST-Ericsson
		*
		* Author: Linus Walleij <linus.walleij@linaro.org>
		*
		* License terms: GNU General Public License (GPL) version 2
		*/
		#ifndef MFD_STW481X_H
		#define MFD_STW481X_H

		#include <linux/i2c.h>
		#include <linux/regulator/machine.h>
		#include <linux/regmap.h>
		#include <linux/bitops.h>

		/* These registers are accessed from more than one driver */
		#define STW_CONF1 0x11U
		#define STW_CONF1_PDN_VMMC 0x01U
		#define STW_CONF1_VMMC_MASK 0x0eU
		#define STW_CONF1_VMMC_1_8V 0x02U
		#define STW_CONF1_VMMC_2_85V 0x04U
		#define STW_CONF1_VMMC_3V 0x06U
		#define STW_CONF1_VMMC_1_85V 0x08U
		#define STW_CONF1_VMMC_2_6V 0x0aU
		#define STW_CONF1_VMMC_2_7V 0x0cU
		#define STW_CONF1_VMMC_3_3V 0x0eU
		#define STW_CONF1_MMC_LS_STATUS 0x10U
		#define STW_PCTL_REG_LO 0x1eU
		#define STW_PCTL_REG_HI 0x1fU
		#define STW_CONF1_V_MONITORING 0x20U
		#define STW_CONF1_IT_WARN 0x40U
		#define STW_CONF1_PDN_VAUX 0x80U
		#define STW_CONF2 0x20U
		#define STW_CONF2_MASK_TWARN 0x01U
		#define STW_CONF2_VMMC_EXT 0x02U
		#define STW_CONF2_MASK_IT_WAKE_UP 0x04U
		#define STW_CONF2_GPO1 0x08U
		#define STW_CONF2_GPO2 0x10U
		#define STW_VCORE_SLEEP 0x21U

		/**
		* struct stw481x - state holder for the Stw481x drivers
		* @mutex: mutex to serialize I2C accesses
		* @i2c_client: corresponding I2C client
		* @regulator: regulator device for regulator children
		* @map: regmap handle to access device registers
		*/
		struct stw481x {
		struct mutex lock;
		struct i2c_client *client;
		struct regulator_dev *vmmc_regulator;
		struct regmap *map;
		};

		#endif

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