/* * ST Microelectronics MFD: stmpe's spi client specific driver * * Copyright (C) ST Microelectronics SA 2011 * * License Terms: GNU General Public License, version 2 * Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics */ #include <linux/spi/spi.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/types.h> #include "stmpe.h" #define READ_CMD (1 << 7) static int spi_reg_read(struct stmpe *stmpe, u8 reg) { struct spi_device *spi = stmpe->client; int status = spi_w8r16(spi, reg | READ_CMD); return (status < 0) ? status : status >> 8; } static int spi_reg_write(struct stmpe *stmpe, u8 reg, u8 val) { struct spi_device *spi = stmpe->client; u16 cmd = (val << 8) | reg; return spi_write(spi, (const u8 *)&cmd, 2); } static int spi_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) { int ret, i; for (i = 0; i < length; i++) { ret = spi_reg_read(stmpe, reg + i); if (ret < 0) return ret; *(values + i) = ret; } return 0; } static int spi_block_write(struct stmpe *stmpe, u8 reg, u8 length, const u8 *values) { int ret = 0, i; for (i = length; i > 0; i--, reg++) { ret = spi_reg_write(stmpe, reg, *(values + i - 1)); if (ret < 0) return ret; } return ret; } static void spi_init(struct stmpe *stmpe) { struct spi_device *spi = stmpe->client; spi->bits_per_word = 8; /* This register is only present for stmpe811 */ if (stmpe->variant->id_val == 0x0811) spi_reg_write(stmpe, STMPE811_REG_SPI_CFG, spi->mode); if (spi_setup(spi) < 0) dev_dbg(&spi->dev, "spi_setup failed\n"); } static struct stmpe_client_info spi_ci = { .read_byte = spi_reg_read, .write_byte = spi_reg_write, .read_block = spi_block_read, .write_block = spi_block_write, .init = spi_init, }; static int stmpe_spi_probe(struct spi_device *spi) { const struct spi_device_id *id = spi_get_device_id(spi); /* don't exceed max specified rate - 1MHz - Limitation of STMPE */ if (spi->max_speed_hz > 1000000) { dev_dbg(&spi->dev, "f(sample) %d KHz?\n", (spi->max_speed_hz/1000)); return -EINVAL; } spi_ci.irq = spi->irq; spi_ci.client = spi; spi_ci.dev = &spi->dev; return stmpe_probe(&spi_ci, id->driver_data); } static int stmpe_spi_remove(struct spi_device *spi) { struct stmpe *stmpe = spi_get_drvdata(spi); return stmpe_remove(stmpe); } static const struct of_device_id stmpe_spi_of_match[] = { { .compatible = "st,stmpe610", }, { .compatible = "st,stmpe801", }, { .compatible = "st,stmpe811", }, { .compatible = "st,stmpe1601", }, { .compatible = "st,stmpe2401", }, { .compatible = "st,stmpe2403", }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, stmpe_spi_of_match); static const struct spi_device_id stmpe_spi_id[] = { { "stmpe610", STMPE610 }, { "stmpe801", STMPE801 }, { "stmpe811", STMPE811 }, { "stmpe1601", STMPE1601 }, { "stmpe2401", STMPE2401 }, { "stmpe2403", STMPE2403 }, { } }; MODULE_DEVICE_TABLE(spi, stmpe_id); static struct spi_driver stmpe_spi_driver = { .driver = { .name = "stmpe-spi", .of_match_table = of_match_ptr(stmpe_spi_of_match), #ifdef CONFIG_PM .pm = &stmpe_dev_pm_ops, #endif }, .probe = stmpe_spi_probe, .remove = stmpe_spi_remove, .id_table = stmpe_spi_id, }; static int __init stmpe_init(void) { return spi_register_driver(&stmpe_spi_driver); } subsys_initcall(stmpe_init); static void __exit stmpe_exit(void) { spi_unregister_driver(&stmpe_spi_driver); } module_exit(stmpe_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("STMPE MFD SPI Interface Driver"); MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");