diff options
Diffstat (limited to 'drivers/mfd/ucb1x00-assabet.c')
| -rw-r--r-- | drivers/mfd/ucb1x00-assabet.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/mfd/ucb1x00-assabet.c b/drivers/mfd/ucb1x00-assabet.c new file mode 100644 index 0000000000..6a389737c6 --- /dev/null +++ b/drivers/mfd/ucb1x00-assabet.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/mfd/ucb1x00-assabet.c + * + * Copyright (C) 2001-2003 Russell King, All Rights Reserved. + * + * We handle the machine-specific bits of the UCB1x00 driver here. + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/fs.h> +#include <linux/gpio_keys.h> +#include <linux/input.h> +#include <linux/platform_device.h> +#include <linux/proc_fs.h> +#include <linux/mfd/ucb1x00.h> + +#define UCB1X00_ATTR(name,input)\ +static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); \ + int val; \ + ucb1x00_adc_enable(ucb); \ + val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC); \ + ucb1x00_adc_disable(ucb); \ + return sprintf(buf, "%d\n", val); \ +} \ +static DEVICE_ATTR_RO(name) + +UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1); +UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0); +UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2); + +static int ucb1x00_assabet_add(struct ucb1x00_dev *dev) +{ + struct ucb1x00 *ucb = dev->ucb; + struct platform_device *pdev; + struct gpio_keys_platform_data keys; + static struct gpio_keys_button buttons[6]; + unsigned i; + + memset(buttons, 0, sizeof(buttons)); + memset(&keys, 0, sizeof(keys)); + + for (i = 0; i < ARRAY_SIZE(buttons); i++) { + buttons[i].code = BTN_0 + i; + buttons[i].gpio = ucb->gpio.base + i; + buttons[i].type = EV_KEY; + buttons[i].can_disable = true; + } + + keys.buttons = buttons; + keys.nbuttons = ARRAY_SIZE(buttons); + keys.poll_interval = 50; + keys.name = "ucb1x00"; + + pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1, + &keys, sizeof(keys)); + + device_create_file(&ucb->dev, &dev_attr_vbatt); + device_create_file(&ucb->dev, &dev_attr_vcharger); + device_create_file(&ucb->dev, &dev_attr_batt_temp); + + dev->priv = pdev; + return 0; +} + +static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev) +{ + struct platform_device *pdev = dev->priv; + + if (!IS_ERR(pdev)) + platform_device_unregister(pdev); + + device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp); + device_remove_file(&dev->ucb->dev, &dev_attr_vcharger); + device_remove_file(&dev->ucb->dev, &dev_attr_vbatt); +} + +static struct ucb1x00_driver ucb1x00_assabet_driver = { + .add = ucb1x00_assabet_add, + .remove = ucb1x00_assabet_remove, +}; + +static int __init ucb1x00_assabet_init(void) +{ + return ucb1x00_register_driver(&ucb1x00_assabet_driver); +} + +static void __exit ucb1x00_assabet_exit(void) +{ + ucb1x00_unregister_driver(&ucb1x00_assabet_driver); +} + +module_init(ucb1x00_assabet_init); +module_exit(ucb1x00_assabet_exit); + +MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); +MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver"); +MODULE_LICENSE("GPL"); |