5a826feedc
The current STMPE I2C probing code does not really match the compatible strings - it matches node names happening to give the right device name. Instead, let's introduce some real compatible matching, more complex, more accurate. Make the driver depend on OF since all platforms using it are DT-only. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*
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* ST Microelectronics MFD: stmpe's i2c client specific driver
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*
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* Copyright (C) ST-Ericsson SA 2010
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* Copyright (C) ST Microelectronics SA 2011
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*
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* License Terms: GNU General Public License, version 2
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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* Author: Viresh Kumar <viresh.linux@gmail.com> for ST Microelectronics
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/of_device.h>
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#include "stmpe.h"
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static int i2c_reg_read(struct stmpe *stmpe, u8 reg)
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{
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struct i2c_client *i2c = stmpe->client;
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return i2c_smbus_read_byte_data(i2c, reg);
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}
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static int i2c_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
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{
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struct i2c_client *i2c = stmpe->client;
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return i2c_smbus_write_byte_data(i2c, reg, val);
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}
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static int i2c_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
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{
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struct i2c_client *i2c = stmpe->client;
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return i2c_smbus_read_i2c_block_data(i2c, reg, length, values);
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}
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static int i2c_block_write(struct stmpe *stmpe, u8 reg, u8 length,
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const u8 *values)
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{
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struct i2c_client *i2c = stmpe->client;
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return i2c_smbus_write_i2c_block_data(i2c, reg, length, values);
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}
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static struct stmpe_client_info i2c_ci = {
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.read_byte = i2c_reg_read,
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.write_byte = i2c_reg_write,
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.read_block = i2c_block_read,
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.write_block = i2c_block_write,
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};
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static const struct of_device_id stmpe_of_match[] = {
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{ .compatible = "st,stmpe610", .data = (void *)STMPE610, },
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{ .compatible = "st,stmpe801", .data = (void *)STMPE801, },
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{ .compatible = "st,stmpe811", .data = (void *)STMPE811, },
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{ .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
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{ .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
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{ .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
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{ .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
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{},
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};
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MODULE_DEVICE_TABLE(of, stmpe_of_match);
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static int
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stmpe_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
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{
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int partnum;
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const struct of_device_id *of_id;
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i2c_ci.data = (void *)id;
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i2c_ci.irq = i2c->irq;
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i2c_ci.client = i2c;
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i2c_ci.dev = &i2c->dev;
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of_id = of_match_device(stmpe_of_match, &i2c->dev);
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if (!of_id) {
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/*
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* This happens when the I2C ID matches the node name
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* but no real compatible string has been given.
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*/
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dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
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partnum = id->driver_data;
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} else
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partnum = (int)of_id->data;
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return stmpe_probe(&i2c_ci, partnum);
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}
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static int stmpe_i2c_remove(struct i2c_client *i2c)
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{
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struct stmpe *stmpe = dev_get_drvdata(&i2c->dev);
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return stmpe_remove(stmpe);
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}
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static const struct i2c_device_id stmpe_i2c_id[] = {
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{ "stmpe610", STMPE610 },
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{ "stmpe801", STMPE801 },
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{ "stmpe811", STMPE811 },
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{ "stmpe1601", STMPE1601 },
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{ "stmpe1801", STMPE1801 },
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{ "stmpe2401", STMPE2401 },
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{ "stmpe2403", STMPE2403 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, stmpe_id);
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static struct i2c_driver stmpe_i2c_driver = {
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.driver = {
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.name = "stmpe-i2c",
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.owner = THIS_MODULE,
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#ifdef CONFIG_PM
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.pm = &stmpe_dev_pm_ops,
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#endif
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.of_match_table = stmpe_of_match,
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},
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.probe = stmpe_i2c_probe,
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.remove = stmpe_i2c_remove,
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.id_table = stmpe_i2c_id,
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};
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static int __init stmpe_init(void)
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{
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return i2c_add_driver(&stmpe_i2c_driver);
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}
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subsys_initcall(stmpe_init);
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static void __exit stmpe_exit(void)
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{
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i2c_del_driver(&stmpe_i2c_driver);
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}
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module_exit(stmpe_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
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MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
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