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161 lines
3.5 KiB
161 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ST Microelectronics MFD: stmpe's spi client specific driver |
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* |
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* Copyright (C) ST Microelectronics SA 2011 |
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* |
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* Author: Viresh Kumar <[email protected]> for ST Microelectronics |
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*/ |
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#include <linux/spi/spi.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/of.h> |
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#include <linux/types.h> |
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#include "stmpe.h" |
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#define READ_CMD (1 << 7) |
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static int spi_reg_read(struct stmpe *stmpe, u8 reg) |
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{ |
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struct spi_device *spi = stmpe->client; |
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int status = spi_w8r16(spi, reg | READ_CMD); |
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return (status < 0) ? status : status >> 8; |
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} |
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static int spi_reg_write(struct stmpe *stmpe, u8 reg, u8 val) |
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{ |
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struct spi_device *spi = stmpe->client; |
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u16 cmd = (val << 8) | reg; |
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return spi_write(spi, (const u8 *)&cmd, 2); |
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} |
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static int spi_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) |
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{ |
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int ret, i; |
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for (i = 0; i < length; i++) { |
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ret = spi_reg_read(stmpe, reg + i); |
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if (ret < 0) |
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return ret; |
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*(values + i) = ret; |
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} |
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return 0; |
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} |
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static int spi_block_write(struct stmpe *stmpe, u8 reg, u8 length, |
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const u8 *values) |
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{ |
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int ret = 0, i; |
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for (i = length; i > 0; i--, reg++) { |
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ret = spi_reg_write(stmpe, reg, *(values + i - 1)); |
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if (ret < 0) |
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return ret; |
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} |
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return ret; |
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} |
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static void spi_init(struct stmpe *stmpe) |
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{ |
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struct spi_device *spi = stmpe->client; |
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spi->bits_per_word = 8; |
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/* This register is only present for stmpe811 */ |
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if (stmpe->variant->id_val == 0x0811) |
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spi_reg_write(stmpe, STMPE811_REG_SPI_CFG, spi->mode); |
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if (spi_setup(spi) < 0) |
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dev_dbg(&spi->dev, "spi_setup failed\n"); |
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} |
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static struct stmpe_client_info spi_ci = { |
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.read_byte = spi_reg_read, |
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.write_byte = spi_reg_write, |
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.read_block = spi_block_read, |
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.write_block = spi_block_write, |
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.init = spi_init, |
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}; |
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static int |
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stmpe_spi_probe(struct spi_device *spi) |
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{ |
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const struct spi_device_id *id = spi_get_device_id(spi); |
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/* don't exceed max specified rate - 1MHz - Limitation of STMPE */ |
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if (spi->max_speed_hz > 1000000) { |
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dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
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(spi->max_speed_hz/1000)); |
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return -EINVAL; |
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} |
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spi_ci.irq = spi->irq; |
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spi_ci.client = spi; |
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spi_ci.dev = &spi->dev; |
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return stmpe_probe(&spi_ci, id->driver_data); |
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} |
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static int stmpe_spi_remove(struct spi_device *spi) |
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{ |
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struct stmpe *stmpe = spi_get_drvdata(spi); |
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return stmpe_remove(stmpe); |
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} |
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static const struct of_device_id stmpe_spi_of_match[] = { |
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{ .compatible = "st,stmpe610", }, |
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{ .compatible = "st,stmpe801", }, |
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{ .compatible = "st,stmpe811", }, |
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{ .compatible = "st,stmpe1601", }, |
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{ .compatible = "st,stmpe2401", }, |
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{ .compatible = "st,stmpe2403", }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, stmpe_spi_of_match); |
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static const struct spi_device_id stmpe_spi_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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{ "stmpe2401", STMPE2401 }, |
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{ "stmpe2403", STMPE2403 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(spi, stmpe_id); |
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static struct spi_driver stmpe_spi_driver = { |
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.driver = { |
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.name = "stmpe-spi", |
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.of_match_table = of_match_ptr(stmpe_spi_of_match), |
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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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}, |
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.probe = stmpe_spi_probe, |
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.remove = stmpe_spi_remove, |
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.id_table = stmpe_spi_id, |
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}; |
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static int __init stmpe_init(void) |
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{ |
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return spi_register_driver(&stmpe_spi_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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spi_unregister_driver(&stmpe_spi_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 SPI Interface Driver"); |
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MODULE_AUTHOR("Viresh Kumar <[email protected]>");
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