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author | Akinobu Mita <akinobu.mita@gmail.com> | 2016-03-14 23:45:00 +0900 |
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committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2016-03-14 17:08:41 +0100 |
commit | 9408ec1af875a83ad75f3dac1aa18d2337a809fe (patch) | |
tree | 42fae0b42985bf19de9921915984f5a7e873789e /drivers/rtc/rtc-pcf2127.c | |
parent | 907b3262583c700ef48f6a45b2b48878b524b2ef (diff) | |
download | op-kernel-dev-9408ec1af875a83ad75f3dac1aa18d2337a809fe.zip op-kernel-dev-9408ec1af875a83ad75f3dac1aa18d2337a809fe.tar.gz |
rtc: pcf2127: add support for spi interface
pcf2127 has selectable I2C-bus and SPI-bus interface support.
This adds support for SPI interface.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc/rtc-pcf2127.c')
-rw-r--r-- | drivers/rtc/rtc-pcf2127.c | 118 |
1 files changed, 116 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c index fa492cd..194c440 100644 --- a/drivers/rtc/rtc-pcf2127.c +++ b/drivers/rtc/rtc-pcf2127.c @@ -1,5 +1,5 @@ /* - * An I2C driver for the NXP PCF2127 RTC + * An I2C and SPI driver for the NXP PCF2127 RTC * Copyright 2013 Til-Technologies * * Author: Renaud Cerrato <r.cerrato@til-technologies.fr> @@ -14,6 +14,7 @@ */ #include <linux/i2c.h> +#include <linux/spi/spi.h> #include <linux/bcd.h> #include <linux/rtc.h> #include <linux/slab.h> @@ -200,6 +201,8 @@ static const struct of_device_id pcf2127_of_match[] = { MODULE_DEVICE_TABLE(of, pcf2127_of_match); #endif +#if IS_ENABLED(CONFIG_I2C) + static int pcf2127_i2c_write(void *context, const void *data, size_t count) { struct device *dev = context; @@ -311,7 +314,118 @@ static struct i2c_driver pcf2127_i2c_driver = { .probe = pcf2127_i2c_probe, .id_table = pcf2127_i2c_id, }; -module_i2c_driver(pcf2127_i2c_driver); + +static int pcf2127_i2c_register_driver(void) +{ + return i2c_add_driver(&pcf2127_i2c_driver); +} + +static void pcf2127_i2c_unregister_driver(void) +{ + i2c_del_driver(&pcf2127_i2c_driver); +} + +#else + +static int pcf2127_i2c_register_driver(void) +{ + return 0; +} + +static void pcf2127_i2c_unregister_driver(void) +{ +} + +#endif + +#if IS_ENABLED(CONFIG_SPI_MASTER) + +static struct spi_driver pcf2127_spi_driver; + +static int pcf2127_spi_probe(struct spi_device *spi) +{ + static const struct regmap_config config = { + .reg_bits = 8, + .val_bits = 8, + .read_flag_mask = 0xa0, + .write_flag_mask = 0x20, + }; + struct regmap *regmap; + + regmap = devm_regmap_init_spi(spi, &config); + if (IS_ERR(regmap)) { + dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n", + __func__, PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name); +} + +static const struct spi_device_id pcf2127_spi_id[] = { + { "pcf2127", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, pcf2127_spi_id); + +static struct spi_driver pcf2127_spi_driver = { + .driver = { + .name = "rtc-pcf2127-spi", + .of_match_table = of_match_ptr(pcf2127_of_match), + }, + .probe = pcf2127_spi_probe, + .id_table = pcf2127_spi_id, +}; + +static int pcf2127_spi_register_driver(void) +{ + return spi_register_driver(&pcf2127_spi_driver); +} + +static void pcf2127_spi_unregister_driver(void) +{ + spi_unregister_driver(&pcf2127_spi_driver); +} + +#else + +static int pcf2127_spi_register_driver(void) +{ + return 0; +} + +static void pcf2127_spi_unregister_driver(void) +{ +} + +#endif + +static int __init pcf2127_init(void) +{ + int ret; + + ret = pcf2127_i2c_register_driver(); + if (ret) { + pr_err("Failed to register pcf2127 i2c driver: %d\n", ret); + return ret; + } + + ret = pcf2127_spi_register_driver(); + if (ret) { + pr_err("Failed to register pcf2127 spi driver: %d\n", ret); + pcf2127_i2c_unregister_driver(); + } + + return ret; +} +module_init(pcf2127_init) + +static void __exit pcf2127_exit(void) +{ + pcf2127_spi_unregister_driver(); + pcf2127_i2c_unregister_driver(); +} +module_exit(pcf2127_exit) MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>"); MODULE_DESCRIPTION("NXP PCF2127 RTC driver"); |