diff options
Diffstat (limited to 'recipes/linux/linux-2.6.34/ts72xx/0018-ts72xx_spi_tmp124.patch')
| -rw-r--r-- | recipes/linux/linux-2.6.34/ts72xx/0018-ts72xx_spi_tmp124.patch | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/recipes/linux/linux-2.6.34/ts72xx/0018-ts72xx_spi_tmp124.patch b/recipes/linux/linux-2.6.34/ts72xx/0018-ts72xx_spi_tmp124.patch new file mode 100644 index 0000000000..cbc5a65965 --- /dev/null +++ b/recipes/linux/linux-2.6.34/ts72xx/0018-ts72xx_spi_tmp124.patch @@ -0,0 +1,298 @@ +From 314f5d55f44d63c4ff418260580b93727eee00dc Mon Sep 17 00:00:00 2001 +From: Matthieu Crapet <mcrapet@gmail.com> +Date: Tue, 22 Jun 2010 15:48:27 +0200 +Subject: [PATCH 18/18] ts72xx_spi_tmp124 + +It's an option. A 3-wire spi temperature sensor can be populated on TS-72XX sbc. +--- + arch/arm/mach-ep93xx/ts72xx.c | 61 ++++++++++++++++ + drivers/spi/Kconfig | 7 ++ + drivers/spi/Makefile | 1 + + drivers/spi/tmp124.c | 158 +++++++++++++++++++++++++++++++++++++++++ + 4 files changed, 227 insertions(+), 0 deletions(-) + create mode 100644 drivers/spi/tmp124.c + +diff --git a/arch/arm/mach-ep93xx/ts72xx.c b/arch/arm/mach-ep93xx/ts72xx.c +index 475559e..bf3a666 100644 +--- a/arch/arm/mach-ep93xx/ts72xx.c ++++ b/arch/arm/mach-ep93xx/ts72xx.c +@@ -23,7 +23,9 @@ + #include <linux/i2c-gpio.h> + #include <linux/mtd/nand.h> + #include <linux/mtd/partitions.h> ++#include <linux/spi/spi.h> + ++#include <mach/ep93xx_spi.h> + #include <mach/hardware.h> + #include <mach/ts72xx.h> + +@@ -367,6 +369,60 @@ static struct i2c_gpio_platform_data ts72xx_i2c_gpio_data = { + static struct i2c_board_info __initdata ts72xx_i2c_board_info[] = { + }; + ++/************************************************************************* ++ * SPI ++ *************************************************************************/ ++#if defined(CONFIG_SPI_TMP124) || defined(CONFIG_SPI_TMP124_MODULE) ++ ++/* this is our GPIO line used for chip select */ ++#define TMP124_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_MCCD2 ++ ++static int ts72xx_tmp124_setup(struct spi_device *spi) ++{ ++ int err; ++ ++ err = gpio_request(TMP124_CHIP_SELECT_GPIO, spi->modalias); ++ if (err) ++ return err; ++ ++ gpio_direction_output(TMP124_CHIP_SELECT_GPIO, 1); ++ ++ return 0; ++} ++ ++static void ts72xx_tmp124_cleanup(struct spi_device *spi) ++{ ++ gpio_set_value(TMP124_CHIP_SELECT_GPIO, 1); ++ gpio_direction_input(TMP124_CHIP_SELECT_GPIO); ++ gpio_free(TMP124_CHIP_SELECT_GPIO); ++} ++ ++static void ts72xx_tmp124_cs_control(struct spi_device *spi, int value) ++{ ++ gpio_set_value(TMP124_CHIP_SELECT_GPIO, value); ++} ++ ++static struct ep93xx_spi_chip_ops ts72xx_tmp124_ops = { ++ .setup = ts72xx_tmp124_setup, ++ .cleanup = ts72xx_tmp124_cleanup, ++ .cs_control = ts72xx_tmp124_cs_control, ++}; ++ ++static struct spi_board_info ts72xx_spi_devices[] = { ++ { ++ .modalias = "tmp124", ++ .max_speed_hz = 2 * 1000 * 1000, ++ .bus_num = 0, ++ .chip_select = 0, ++ .controller_data = &ts72xx_tmp124_ops, ++ }, ++}; ++ ++static struct ep93xx_spi_info ts72xx_spi_info = { ++ .num_chipselect = ARRAY_SIZE(ts72xx_spi_devices), ++}; ++#endif ++ + static void __init ts72xx_init_machine(void) + { + ep93xx_init_devices(); +@@ -380,6 +436,11 @@ static void __init ts72xx_init_machine(void) + ts72xx_i2c_board_info, + ARRAY_SIZE(ts72xx_i2c_board_info)); + ++ #if defined(CONFIG_SPI_TMP124) || defined(CONFIG_SPI_TMP124_MODULE) ++ ep93xx_register_spi(&ts72xx_spi_info, ts72xx_spi_devices, ++ ARRAY_SIZE(ts72xx_spi_devices)); ++ #endif ++ + if (is_max197_installed()) { + platform_device_register(&ts72xx_max197_device); + } +diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig +index 2b2f4c3..9f40a43 100644 +--- a/drivers/spi/Kconfig ++++ b/drivers/spi/Kconfig +@@ -372,6 +372,13 @@ config SPI_TLE62X0 + sysfs interface, with each line presented as a kind of GPIO + exposing both switch control and diagnostic feedback. + ++config SPI_TMP124 ++ tristate "Texas Instruments TMP1224, TMP124" ++ depends on SPI_MASTER && SYSFS ++ help ++ SPI driver for TMP12X temperature sensor chips. ++ This provides a sysfs entry for temperature reading (2�C accurate). ++ + # + # Add new SPI protocol masters in alphabetical order above this line + # +diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile +index 377f845..2798b38 100644 +--- a/drivers/spi/Makefile ++++ b/drivers/spi/Makefile +@@ -56,6 +56,7 @@ spi_s3c24xx_hw-$(CONFIG_SPI_S3C24XX_FIQ) += spi_s3c24xx_fiq.o + # SPI protocol drivers (device/link on bus) + obj-$(CONFIG_SPI_SPIDEV) += spidev.o + obj-$(CONFIG_SPI_TLE62X0) += tle62x0.o ++obj-$(CONFIG_SPI_TMP124) += tmp124.o + # ... add above this line ... + + # SPI slave controller drivers (upstream link) +diff --git a/drivers/spi/tmp124.c b/drivers/spi/tmp124.c +new file mode 100644 +index 0000000..e41ec8c +--- /dev/null ++++ b/drivers/spi/tmp124.c +@@ -0,0 +1,158 @@ ++/* ++ * TMP124 SPI protocol driver ++ * ++ * (c) Copyright 2008-2010 Matthieu Crapet <mcrapet@gmail.com> ++ * Based on tle62x0.c by Ben Dooks, <ben@simtec.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License as published by ++ * the Free Software Foundation; either version 2 of the License, or ++ * (at your option) any later version. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ * Note: The chip uses a '3-wire SPI' (miso and mosi are the same pin). ++ */ ++ ++#include <linux/module.h> ++#include <linux/kernel.h> ++#include <linux/init.h> ++#include <linux/spi/spi.h> ++#include <linux/slab.h> ++#include <linux/sched.h> ++ ++struct tmp124_state { ++ struct spi_device *bus; ++ u8 tx_buff[2]; ++ u8 rx_buff[2]; ++}; ++ ++static inline int tmp124_write_then_read(struct tmp124_state *st) ++{ ++ struct spi_message msg; ++ struct spi_transfer xfer[2] = { ++ { ++ .tx_buf = st->tx_buff, ++ .rx_buf = NULL, ++ .len = 2, ++ }, { ++ .tx_buf = NULL, ++ .rx_buf = st->rx_buff, ++ .len = 2, ++ } ++ }; ++ ++ spi_message_init(&msg); ++ spi_message_add_tail(&xfer[0], &msg); ++ spi_sync(st->bus, &msg); ++ ++ /* SPI_3WIRE is not handled by ep93xx_spi, the 2 messages must be ++ * splitted. We must wait to not confuse driver with read/write. */ ++ schedule_timeout(usecs_to_jiffies(1000)); ++ ++ spi_message_init(&msg); ++ spi_message_add_tail(&xfer[1], &msg); ++ return spi_sync(st->bus, &msg); ++} ++ ++static ssize_t tmp124_temperature_show(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ struct tmp124_state *st = dev_get_drvdata(dev); ++ int ret; ++ ++ ((short *)st->tx_buff)[0] = 0x8000; ++ ++ ret = tmp124_write_then_read(st); ++ if (ret < 0) { ++ dev_err(&st->bus->dev, "tmp124_write_then_read\n"); ++ ret = 0; ++ } else { ++ signed long val = ((short *)st->rx_buff)[0]; ++ ++ val = val >> 3; ++ ++ /* 2 digit precision (0.0625*100) */ ++ val = (val * 50) / 8; ++ ret = snprintf(buf, PAGE_SIZE, "%ld.%02ld\n", val/100, abs(val%100)); ++ } ++ return ret; ++} ++ ++static DEVICE_ATTR(temperature, S_IRUGO, tmp124_temperature_show, NULL); ++ ++static int __devinit tmp124_probe(struct spi_device *spi) ++{ ++ struct tmp124_state *st; ++ int ret; ++ ++ st = kzalloc(sizeof(struct tmp124_state), GFP_KERNEL); ++ if (st == NULL) { ++ dev_err(&spi->dev, "no memory for device state\n"); ++ return -ENOMEM; ++ } ++ ++ /* required config */ ++ spi->bits_per_word = 16; ++ spi->mode = SPI_MODE_0; ++ ++ ret = spi_setup(spi); ++ if (ret) { ++ dev_err(&spi->dev, "setup device\n"); ++ goto err; ++ } ++ ++ ret = device_create_file(&spi->dev, &dev_attr_temperature); ++ if (ret) { ++ dev_err(&spi->dev, "cannot create temperature attribute\n"); ++ goto err; ++ } ++ ++ st->bus = spi; ++ spi_set_drvdata(spi, st); ++ return 0; ++ ++err: ++ kfree(st); ++ return ret; ++} ++ ++static int __devexit tmp124_remove(struct spi_device *spi) ++{ ++ struct tmp124_state *st = spi_get_drvdata(spi); ++ ++ device_remove_file(&spi->dev, &dev_attr_temperature); ++ kfree(st); ++ return 0; ++} ++ ++static struct spi_driver tmp124_driver = { ++ .driver = { ++ .name = "tmp124", ++ .owner = THIS_MODULE, ++ }, ++ .probe = tmp124_probe, ++ .remove = __devexit_p(tmp124_remove), ++}; ++ ++static __init int tmp124_init(void) ++{ ++ return spi_register_driver(&tmp124_driver); ++} ++ ++static __exit void tmp124_exit(void) ++{ ++ spi_unregister_driver(&tmp124_driver); ++} ++ ++module_init(tmp124_init); ++module_exit(tmp124_exit); ++ ++MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>"); ++MODULE_DESCRIPTION("TMP124 SPI Protocol Driver"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("spi:tmp124"); ++MODULE_VERSION("0.2"); +-- +1.7.1 + |