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271 lines
6.5 KiB
271 lines
6.5 KiB
/* |
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* tps65217.c |
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* |
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* TPS65217 chip family multi-function driver |
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* |
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation version 2. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/init.h> |
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#include <linux/i2c.h> |
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#include <linux/slab.h> |
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#include <linux/regmap.h> |
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#include <linux/err.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps65217.h> |
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static const struct mfd_cell tps65217s[] = { |
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{ |
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.name = "tps65217-pmic", |
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}, |
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{ |
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.name = "tps65217-bl", |
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}, |
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}; |
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/** |
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* tps65217_reg_read: Read a single tps65217 register. |
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* |
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* @tps: Device to read from. |
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* @reg: Register to read. |
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* @val: Contians the value |
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*/ |
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int tps65217_reg_read(struct tps65217 *tps, unsigned int reg, |
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unsigned int *val) |
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{ |
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return regmap_read(tps->regmap, reg, val); |
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} |
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EXPORT_SYMBOL_GPL(tps65217_reg_read); |
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/** |
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* tps65217_reg_write: Write a single tps65217 register. |
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* |
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* @tps65217: Device to write to. |
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* @reg: Register to write to. |
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* @val: Value to write. |
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* @level: Password protected level |
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*/ |
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int tps65217_reg_write(struct tps65217 *tps, unsigned int reg, |
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unsigned int val, unsigned int level) |
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{ |
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int ret; |
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unsigned int xor_reg_val; |
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switch (level) { |
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case TPS65217_PROTECT_NONE: |
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return regmap_write(tps->regmap, reg, val); |
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case TPS65217_PROTECT_L1: |
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
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xor_reg_val); |
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if (ret < 0) |
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return ret; |
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return regmap_write(tps->regmap, reg, val); |
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case TPS65217_PROTECT_L2: |
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
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xor_reg_val); |
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if (ret < 0) |
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return ret; |
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ret = regmap_write(tps->regmap, reg, val); |
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if (ret < 0) |
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return ret; |
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
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xor_reg_val); |
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if (ret < 0) |
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return ret; |
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return regmap_write(tps->regmap, reg, val); |
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default: |
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return -EINVAL; |
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} |
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} |
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EXPORT_SYMBOL_GPL(tps65217_reg_write); |
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/** |
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* tps65217_update_bits: Modify bits w.r.t mask, val and level. |
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* |
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* @tps65217: Device to write to. |
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* @reg: Register to read-write to. |
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* @mask: Mask. |
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* @val: Value to write. |
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* @level: Password protected level |
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*/ |
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static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg, |
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unsigned int mask, unsigned int val, unsigned int level) |
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{ |
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int ret; |
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unsigned int data; |
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ret = tps65217_reg_read(tps, reg, &data); |
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if (ret) { |
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dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); |
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return ret; |
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} |
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data &= ~mask; |
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data |= val & mask; |
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ret = tps65217_reg_write(tps, reg, data, level); |
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if (ret) |
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dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); |
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return ret; |
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} |
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int tps65217_set_bits(struct tps65217 *tps, unsigned int reg, |
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unsigned int mask, unsigned int val, unsigned int level) |
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{ |
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return tps65217_update_bits(tps, reg, mask, val, level); |
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} |
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EXPORT_SYMBOL_GPL(tps65217_set_bits); |
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int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg, |
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unsigned int mask, unsigned int level) |
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{ |
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return tps65217_update_bits(tps, reg, mask, 0, level); |
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} |
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EXPORT_SYMBOL_GPL(tps65217_clear_bits); |
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static struct regmap_config tps65217_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = TPS65217_REG_MAX, |
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}; |
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static const struct of_device_id tps65217_of_match[] = { |
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{ .compatible = "ti,tps65217", .data = (void *)TPS65217 }, |
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{ /* sentinel */ }, |
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}; |
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static int tps65217_probe(struct i2c_client *client, |
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const struct i2c_device_id *ids) |
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{ |
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struct tps65217 *tps; |
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unsigned int version; |
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unsigned long chip_id = ids->driver_data; |
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const struct of_device_id *match; |
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bool status_off = false; |
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int ret; |
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if (client->dev.of_node) { |
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match = of_match_device(tps65217_of_match, &client->dev); |
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if (!match) { |
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dev_err(&client->dev, |
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"Failed to find matching dt id\n"); |
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return -EINVAL; |
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} |
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chip_id = (unsigned long)match->data; |
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status_off = of_property_read_bool(client->dev.of_node, |
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"ti,pmic-shutdown-controller"); |
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} |
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if (!chip_id) { |
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dev_err(&client->dev, "id is null.\n"); |
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return -ENODEV; |
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} |
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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
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if (!tps) |
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return -ENOMEM; |
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i2c_set_clientdata(client, tps); |
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tps->dev = &client->dev; |
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tps->id = chip_id; |
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tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config); |
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if (IS_ERR(tps->regmap)) { |
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ret = PTR_ERR(tps->regmap); |
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dev_err(tps->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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ret = mfd_add_devices(tps->dev, -1, tps65217s, |
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ARRAY_SIZE(tps65217s), NULL, 0, NULL); |
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if (ret < 0) { |
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dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret); |
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return ret; |
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} |
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ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version); |
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if (ret < 0) { |
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dev_err(tps->dev, "Failed to read revision register: %d\n", |
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ret); |
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return ret; |
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} |
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/* Set the PMIC to shutdown on PWR_EN toggle */ |
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if (status_off) { |
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ret = tps65217_set_bits(tps, TPS65217_REG_STATUS, |
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TPS65217_STATUS_OFF, TPS65217_STATUS_OFF, |
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TPS65217_PROTECT_NONE); |
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if (ret) |
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dev_warn(tps->dev, "unable to set the status OFF\n"); |
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} |
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dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n", |
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(version & TPS65217_CHIPID_CHIP_MASK) >> 4, |
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version & TPS65217_CHIPID_REV_MASK); |
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return 0; |
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} |
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static int tps65217_remove(struct i2c_client *client) |
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{ |
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struct tps65217 *tps = i2c_get_clientdata(client); |
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mfd_remove_devices(tps->dev); |
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return 0; |
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} |
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static const struct i2c_device_id tps65217_id_table[] = { |
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{"tps65217", TPS65217}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tps65217_id_table); |
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static struct i2c_driver tps65217_driver = { |
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.driver = { |
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.name = "tps65217", |
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.owner = THIS_MODULE, |
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.of_match_table = tps65217_of_match, |
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}, |
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.id_table = tps65217_id_table, |
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.probe = tps65217_probe, |
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.remove = tps65217_remove, |
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}; |
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static int __init tps65217_init(void) |
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{ |
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return i2c_add_driver(&tps65217_driver); |
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} |
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subsys_initcall(tps65217_init); |
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static void __exit tps65217_exit(void) |
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{ |
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i2c_del_driver(&tps65217_driver); |
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} |
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module_exit(tps65217_exit); |
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MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>"); |
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MODULE_DESCRIPTION("TPS65217 chip family multi-function driver"); |
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MODULE_LICENSE("GPL v2");
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