/* * tps65217.c * * TPS65217 chip family multi-function driver * * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/kernel.h> #include <linux/device.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/slab.h> #include <linux/regmap.h> #include <linux/err.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/mfd/core.h> #include <linux/mfd/tps65217.h> static struct mfd_cell tps65217s[] = { { .name = "tps65217-pmic", }, { .name = "tps65217-bl", }, }; /** * tps65217_reg_read: Read a single tps65217 register. * * @tps: Device to read from. * @reg: Register to read. * @val: Contians the value */ int tps65217_reg_read(struct tps65217 *tps, unsigned int reg, unsigned int *val) { return regmap_read(tps->regmap, reg, val); } EXPORT_SYMBOL_GPL(tps65217_reg_read); /** * tps65217_reg_write: Write a single tps65217 register. * * @tps65217: Device to write to. * @reg: Register to write to. * @val: Value to write. * @level: Password protected level */ int tps65217_reg_write(struct tps65217 *tps, unsigned int reg, unsigned int val, unsigned int level) { int ret; unsigned int xor_reg_val; switch (level) { case TPS65217_PROTECT_NONE: return regmap_write(tps->regmap, reg, val); case TPS65217_PROTECT_L1: xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, xor_reg_val); if (ret < 0) return ret; return regmap_write(tps->regmap, reg, val); case TPS65217_PROTECT_L2: xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, xor_reg_val); if (ret < 0) return ret; ret = regmap_write(tps->regmap, reg, val); if (ret < 0) return ret; ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, xor_reg_val); if (ret < 0) return ret; return regmap_write(tps->regmap, reg, val); default: return -EINVAL; } } EXPORT_SYMBOL_GPL(tps65217_reg_write); /** * tps65217_update_bits: Modify bits w.r.t mask, val and level. * * @tps65217: Device to write to. * @reg: Register to read-write to. * @mask: Mask. * @val: Value to write. * @level: Password protected level */ static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg, unsigned int mask, unsigned int val, unsigned int level) { int ret; unsigned int data; ret = tps65217_reg_read(tps, reg, &data); if (ret) { dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); return ret; } data &= ~mask; data |= val & mask; ret = tps65217_reg_write(tps, reg, data, level); if (ret) dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); return ret; } int tps65217_set_bits(struct tps65217 *tps, unsigned int reg, unsigned int mask, unsigned int val, unsigned int level) { return tps65217_update_bits(tps, reg, mask, val, level); } EXPORT_SYMBOL_GPL(tps65217_set_bits); int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg, unsigned int mask, unsigned int level) { return tps65217_update_bits(tps, reg, mask, 0, level); } EXPORT_SYMBOL_GPL(tps65217_clear_bits); static struct regmap_config tps65217_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static const struct of_device_id tps65217_of_match[] = { { .compatible = "ti,tps65217", .data = (void *)TPS65217 }, { /* sentinel */ }, }; static int tps65217_probe(struct i2c_client *client, const struct i2c_device_id *ids) { struct tps65217 *tps; unsigned int version; unsigned int chip_id = ids->driver_data; const struct of_device_id *match; bool status_off = false; int ret; if (client->dev.of_node) { match = of_match_device(tps65217_of_match, &client->dev); if (!match) { dev_err(&client->dev, "Failed to find matching dt id\n"); return -EINVAL; } chip_id = (unsigned int)match->data; status_off = of_property_read_bool(client->dev.of_node, "ti,pmic-shutdown-controller"); } if (!chip_id) { dev_err(&client->dev, "id is null.\n"); return -ENODEV; } tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); if (!tps) return -ENOMEM; i2c_set_clientdata(client, tps); tps->dev = &client->dev; tps->id = chip_id; tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config); if (IS_ERR(tps->regmap)) { ret = PTR_ERR(tps->regmap); dev_err(tps->dev, "Failed to allocate register map: %d\n", ret); return ret; } ret = mfd_add_devices(tps->dev, -1, tps65217s, ARRAY_SIZE(tps65217s), NULL, 0, NULL); if (ret < 0) { dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret); return ret; } ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version); if (ret < 0) { dev_err(tps->dev, "Failed to read revision register: %d\n", ret); return ret; } /* Set the PMIC to shutdown on PWR_EN toggle */ if (status_off) { ret = tps65217_set_bits(tps, TPS65217_REG_STATUS, TPS65217_STATUS_OFF, TPS65217_STATUS_OFF, TPS65217_PROTECT_NONE); if (ret) dev_warn(tps->dev, "unable to set the status OFF\n"); } dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n", (version & TPS65217_CHIPID_CHIP_MASK) >> 4, version & TPS65217_CHIPID_REV_MASK); return 0; } static int tps65217_remove(struct i2c_client *client) { struct tps65217 *tps = i2c_get_clientdata(client); mfd_remove_devices(tps->dev); return 0; } static const struct i2c_device_id tps65217_id_table[] = { {"tps65217", TPS65217}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(i2c, tps65217_id_table); static struct i2c_driver tps65217_driver = { .driver = { .name = "tps65217", .owner = THIS_MODULE, .of_match_table = tps65217_of_match, }, .id_table = tps65217_id_table, .probe = tps65217_probe, .remove = tps65217_remove, }; static int __init tps65217_init(void) { return i2c_add_driver(&tps65217_driver); } subsys_initcall(tps65217_init); static void __exit tps65217_exit(void) { i2c_del_driver(&tps65217_driver); } module_exit(tps65217_exit); MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>"); MODULE_DESCRIPTION("TPS65217 chip family multi-function driver"); MODULE_LICENSE("GPL v2");