150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/*
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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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* License Terms: GNU General Public License, version 2
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* Author: Viresh Kumar <viresh.linux@gmail.com> 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/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 __devinit
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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 __devexit stmpe_spi_remove(struct spi_device *spi)
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{
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struct stmpe *stmpe = dev_get_drvdata(&spi->dev);
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return stmpe_remove(stmpe);
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}
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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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.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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},
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.probe = stmpe_spi_probe,
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.remove = __devexit_p(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 <viresh.linux@gmail.com>");
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