0848c94fb4
Currently the MFD core supports remapping MFD cell interrupts using an irqdomain but only if the MFD is being instantiated using device tree and only if the device tree bindings use the pattern of registering IPs in the device tree with compatible properties. This will be actively harmful for drivers which support non-DT platforms and use this pattern for their DT bindings as it will mean that the core will silently change remapping behaviour and it is also limiting for drivers which don't do DT with this particular pattern. There is also a potential fragility if there are interrupts not associated with MFD cells and all the cells are omitted from the device tree for some reason. Instead change the code to take an IRQ domain as an optional argument, allowing drivers to take the decision about the parent domain for their interrupts. The one current user of this feature is ab8500-core, it has the domain lookup pushed out into the driver. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
255 lines
6.1 KiB
C
255 lines
6.1 KiB
C
/*
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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 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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/**
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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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};
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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 __devinit 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 int chip_id = ids->driver_data;
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const struct of_device_id *match;
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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 int)match->data;
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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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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 __devexit 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 = of_match_ptr(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 = __devexit_p(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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