On 05/26/10 09:30, Hemanth V wrote: >> From: Hemanth V <hemanthv@xxxxxx> >> Date: Fri, 21 May 2010 15:52:03 +0530 >> Subject: [PATCH] misc: ROHM BH1780GLI Ambient light sensor Driver >> >> This patch adds support for ROHM BH1780GLI Ambient light sensor. >> >> BH1780 supports I2C interface. Driver supports read/update of power state and >> read of lux value (through SYSFS). Writing value 3 to power_state enables the >> sensor and current lux value could be read. >> > Jonathan, Daniel > > If there are no more comments, do you know howto push this to linus tree. It's in misc, so send a copy (with reference back to review thread) to Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Andrew tends to pick things up eventually for lkml, but he'll notice it quicker if you cc him in on relevant emails! Jonathan > > Thanks > Hemanth > >> Signed-off-by: Hemanth V <hemanthv@xxxxxx> >> Reviewed-by: Daniel Mack <daniel@xxxxxxxx> >> Acked-by: Jonathan Cameron <jic23@xxxxxxxxx> >> --- >> drivers/misc/Kconfig | 10 ++ >> drivers/misc/Makefile | 1 + >> drivers/misc/bh1780gli.c | 273 ++++++++++++++++++++++++++++++++++++++++++++++ >> 3 files changed, 284 insertions(+), 0 deletions(-) >> create mode 100644 drivers/misc/bh1780gli.c >> >> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig >> index 0d0d625..3f5bf0f 100644 >> --- a/drivers/misc/Kconfig >> +++ b/drivers/misc/Kconfig >> @@ -278,6 +278,16 @@ config SENSORS_TSL2550 >> This driver can also be built as a module. If so, the module >> will be called tsl2550. >> >> +config SENSORS_BH1780 >> + tristate "ROHM BH1780GLI ambient light sensor" >> + depends on I2C && SYSFS >> + help >> + If you say yes here you get support for the ROHM BH1780GLI >> + ambient light sensor. >> + >> + This driver can also be built as a module. If so, the module >> + will be called bh1780gli. >> + >> config EP93XX_PWM >> tristate "EP93xx PWM support" >> depends on ARCH_EP93XX >> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile >> index 7b6f7ee..c479d91 100644 >> --- a/drivers/misc/Makefile >> +++ b/drivers/misc/Makefile >> @@ -30,3 +30,4 @@ obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/ >> obj-y += eeprom/ >> obj-y += cb710/ >> obj-$(CONFIG_VMWARE_BALLOON) += vmware_balloon.o >> +obj-$(CONFIG_SENSORS_BH1780) += bh1780gli.o >> diff --git a/drivers/misc/bh1780gli.c b/drivers/misc/bh1780gli.c >> new file mode 100644 >> index 0000000..774531d >> --- /dev/null >> +++ b/drivers/misc/bh1780gli.c >> @@ -0,0 +1,273 @@ >> +/* >> + * bh1780gli.c >> + * ROHM Ambient Light Sensor Driver >> + * >> + * Copyright (C) 2010 Texas Instruments >> + * Author: Hemanth V <hemanthv@xxxxxx> >> + * >> + * This program is free software; you can redistribute it and/or modify it >> + * under the terms of the GNU General Public License version 2 as published by >> + * the Free Software Foundation. >> + * >> + * 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. >> + * >> + * You should have received a copy of the GNU General Public License along with >> + * this program. If not, see <http://www.gnu.org/licenses/>. >> + */ >> +#include <linux/i2c.h> >> +#include <linux/slab.h> >> +#include <linux/mutex.h> >> +#include <linux/platform_device.h> >> +#include <linux/delay.h> >> + >> +#define BH1780_REG_CONTROL 0x80 >> +#define BH1780_REG_PARTID 0x8A >> +#define BH1780_REG_MANFID 0x8B >> +#define BH1780_REG_DLOW 0x8C >> +#define BH1780_REG_DHIGH 0x8D >> + >> +#define BH1780_REVMASK (0xf) >> +#define BH1780_POWMASK (0x3) >> +#define BH1780_POFF (0x0) >> +#define BH1780_PON (0x3) >> + >> +/* power on settling time in ms */ >> +#define BH1780_PON_DELAY 2 >> + >> +struct bh1780_data { >> + struct i2c_client *client; >> + int power_state; >> + /* lock for sysfs operations */ >> + struct mutex lock; >> +}; >> + >> +static int bh1780_write(struct bh1780_data *ddata, u8 reg, u8 val, char *msg) >> +{ >> + int ret = i2c_smbus_write_byte_data(ddata->client, reg, val); >> + if (ret < 0) >> + dev_err(&ddata->client->dev, >> + "i2c_smbus_write_byte_data failed error %d\ >> + Register (%s)\n", ret, msg); >> + return ret; >> +} >> + >> +static int bh1780_read(struct bh1780_data *ddata, u8 reg, char *msg) >> +{ >> + int ret = i2c_smbus_read_byte_data(ddata->client, reg); >> + if (ret < 0) >> + dev_err(&ddata->client->dev, >> + "i2c_smbus_read_byte_data failed error %d\ >> + Register (%s)\n", ret, msg); >> + return ret; >> +} >> + >> +static ssize_t bh1780_show_lux(struct device *dev, >> + struct device_attribute *attr, char *buf) >> +{ >> + struct platform_device *pdev = to_platform_device(dev); >> + struct bh1780_data *ddata = platform_get_drvdata(pdev); >> + int lsb, msb; >> + >> + lsb = bh1780_read(ddata, BH1780_REG_DLOW, "DLOW"); >> + if (lsb < 0) >> + return lsb; >> + >> + msb = bh1780_read(ddata, BH1780_REG_DHIGH, "DHIGH"); >> + if (msb < 0) >> + return msb; >> + >> + return sprintf(buf, "%d\n", (msb << 8) | lsb); >> +} >> + >> +static ssize_t bh1780_show_power_state(struct device *dev, >> + struct device_attribute *attr, >> + char *buf) >> +{ >> + struct platform_device *pdev = to_platform_device(dev); >> + struct bh1780_data *ddata = platform_get_drvdata(pdev); >> + int state; >> + >> + state = bh1780_read(ddata, BH1780_REG_CONTROL, "CONTROL"); >> + if (state < 0) >> + return state; >> + >> + return sprintf(buf, "%d\n", state & BH1780_POWMASK); >> +} >> + >> +static ssize_t bh1780_store_power_state(struct device *dev, >> + struct device_attribute *attr, >> + const char *buf, size_t count) >> +{ >> + struct platform_device *pdev = to_platform_device(dev); >> + struct bh1780_data *ddata = platform_get_drvdata(pdev); >> + unsigned long val; >> + int error; >> + >> + error = strict_strtoul(buf, 0, &val); >> + if (error) >> + return error; >> + >> + if (val < BH1780_POFF || val > BH1780_PON) >> + return -EINVAL; >> + >> + mutex_lock(&ddata->lock); >> + >> + error = bh1780_write(ddata, BH1780_REG_CONTROL, val, "CONTROL"); >> + if (error < 0) { >> + mutex_unlock(&ddata->lock); >> + return error; >> + } >> + >> + msleep(BH1780_PON_DELAY); >> + ddata->power_state = val; >> + mutex_unlock(&ddata->lock); >> + >> + return count; >> +} >> + >> +static DEVICE_ATTR(lux, S_IRUGO, bh1780_show_lux, NULL); >> + >> +static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO, >> + bh1780_show_power_state, bh1780_store_power_state); >> + >> +static struct attribute *bh1780_attributes[] = { >> + &dev_attr_power_state.attr, >> + &dev_attr_lux.attr, >> + NULL >> +}; >> + >> +static const struct attribute_group bh1780_attr_group = { >> + .attrs = bh1780_attributes, >> +}; >> + >> +static int __devinit bh1780_probe(struct i2c_client *client, >> + const struct i2c_device_id *id) >> +{ >> + int ret; >> + struct bh1780_data *ddata = NULL; >> + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); >> + >> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) { >> + ret = -EIO; >> + goto err_op_failed; >> + } >> + >> + ddata = kzalloc(sizeof(struct bh1780_data), GFP_KERNEL); >> + if (ddata == NULL) { >> + ret = -ENOMEM; >> + goto err_op_failed; >> + } >> + >> + ddata->client = client; >> + i2c_set_clientdata(client, ddata); >> + >> + ret = bh1780_read(ddata, BH1780_REG_PARTID, "PART ID"); >> + if (ret < 0) >> + goto err_op_failed; >> + >> + dev_info(&client->dev, "Ambient Light Sensor, Rev : %d\n", >> + (ret & BH1780_REVMASK)); >> + >> + mutex_init(&ddata->lock); >> + >> + ret = sysfs_create_group(&client->dev.kobj, &bh1780_attr_group); >> + if (ret) >> + goto err_op_failed; >> + >> + return 0; >> + >> +err_op_failed: >> + kfree(ddata); >> + return ret; >> +} >> + >> +static int __devexit bh1780_remove(struct i2c_client *client) >> +{ >> + struct bh1780_data *ddata; >> + >> + ddata = i2c_get_clientdata(client); >> + sysfs_remove_group(&client->dev.kobj, &bh1780_attr_group); >> + i2c_set_clientdata(client, NULL); >> + kfree(ddata); >> + >> + return 0; >> +} >> + >> +#ifdef CONFIG_PM >> +static int bh1780_suspend(struct i2c_client *client, pm_message_t mesg) >> +{ >> + struct bh1780_data *ddata; >> + int state, ret; >> + >> + ddata = i2c_get_clientdata(client); >> + state = bh1780_read(ddata, BH1780_REG_CONTROL, "CONTROL"); >> + if (state < 0) >> + return state; >> + >> + ddata->power_state = state & BH1780_POWMASK; >> + >> + ret = bh1780_write(ddata, BH1780_REG_CONTROL, BH1780_POFF, >> + "CONTROL"); >> + >> + if (ret < 0) >> + return ret; >> + >> + return 0; >> +} >> + >> +static int bh1780_resume(struct i2c_client *client) >> +{ >> + struct bh1780_data *ddata; >> + int state, ret; >> + >> + ddata = i2c_get_clientdata(client); >> + state = ddata->power_state; >> + >> + ret = bh1780_write(ddata, BH1780_REG_CONTROL, state, >> + "CONTROL"); >> + >> + if (ret < 0) >> + return ret; >> + >> + return 0; >> +} >> +#else >> +#define bh1780_suspend NULL >> +#define bh1780_resume NULL >> +#endif /* CONFIG_PM */ >> + >> +static const struct i2c_device_id bh1780_id[] = { >> + { "bh1780", 0 }, >> + { }, >> +}; >> + >> +static struct i2c_driver bh1780_driver = { >> + .probe = bh1780_probe, >> + .remove = bh1780_remove, >> + .id_table = bh1780_id, >> + .suspend = bh1780_suspend, >> + .resume = bh1780_resume, >> + .driver = { >> + .name = "bh1780" >> + }, >> +}; >> + >> +static int __init bh1780_init(void) >> +{ >> + return i2c_add_driver(&bh1780_driver); >> +} >> + >> +static void __exit bh1780_exit(void) >> +{ >> + i2c_del_driver(&bh1780_driver); >> +} >> + >> +module_init(bh1780_init) >> +module_exit(bh1780_exit) >> + >> +MODULE_DESCRIPTION("BH1780GLI Ambient Light Sensor Driver"); >> +MODULE_LICENSE("GPL"); >> +MODULE_AUTHOR("Hemanth V <hemanthv@xxxxxx>"); >> -- >> 1.5.6.3 >> > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
