diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 10:58:17 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 10:58:17 -0800 |
commit | ac26663572db5b64522b92f3941a58678a832a36 (patch) | |
tree | 3a8d27153de37cb3f3fb0ff6843a1e727c961005 /drivers | |
parent | d4371f94bc003e912d4825f5c4bdf57959857073 (diff) | |
parent | 02915661dbb91b25b621ab3f387ab55311bded7f (diff) |
Merge tag 'mfd-3.14-1' of git://git.linaro.org/people/ljones/mfd
Pull MFD changes from Lee Jones:
"New drivers
- Samsung Maxim 14577; Micro USB, Regulator, IRQ Controller and
Battery Charger
- TI/National Semiconductor LP3943 I2C GPIO Expander and PWM
Generator
Existing driver adaptions
- Expansion of Wolfson Arizona DSP and High-Pass filter controls
- TI TWL6040 default Regmap support and Regcache addition/bypass
- Some nice Smatch catch fixes
- Conversion of TI OMAP-USB and TI TWL6030 to endian neutralness
- ChromeOS EC timing (delay) adaptions and added dependency on OF
- Many constifications of 'struct {mfd_cell,regmap_irq,et.al}'
- Watchdog support added for NVIDIA AS3722
- Convert functions to static in TI AM335x
- Realigned previously defeated functionality in TI AM335x
- IIO ADC-TSC concurrency dead-lock/timeout resolution
- Addition of Power Management and Clock support for Samsung core
- DEFINE_PCI_DEVICE_TABLE macro removal from MFD Subsystem
- Greater use of irqdomain functionality in ST-E AB8500
- Removal of 'include/linux/mfd/abx500/ab8500-gpio.h'
- Wolfson WM831x PMIC Power Management changes s/poweroff/shutdown/
- Device Tree documentation added for TI/Nat Semi LP3943
- Version detection and voltage tables for TI TPS6586x PMIC devices
- Simplification of Freescale MC13XXX (de-)initialisation routines
- Clean-up and simplification of the Realtek parent driver
- Added support for RTL8402 Realtek PCI-Express card reader
- Resource leak fix for Maxim 77686
- Possible suspend BUG() fix in OMAP USB TLL
- Support for new Wolfson WM5110 Revision (D)
- Testing of automatic assignment of of_node in mfd_add_device()
- Reversion of the above when it started to cause issues
- Remove legacy Platform Data from;
TI TWL Core, Qualcomm SSBI and ST-E ABx500 Pinctrl
- Clean-ups; tabbing issues, function name changes, 'drvdata = NULL'
removal, unused uninitialised warning mitigation, error
message clarity, removal of redundant/duplicate checks,
licensing (GPL -> GPL2), coding consistency, duplicate
function declaration, ret checks, commit corrections,
redundant of_match_ptr() helper removal, spelling,
#if-deffery removal and header guards name changes"
* tag 'mfd-3.14-1' of git://git.linaro.org/people/ljones/mfd: (78 commits)
mfd: wm5110: Add register patch for rev D chip
mfd: omap-usb-tll: Don't hold lock during pm_runtime_get/put_sync()
gpio: lp3943: Remove redundant of_match_ptr helper
mfd: sta2x11-mfd: Use named constants for pci_power_t values
Documentation: mfd: Fix LDO index in s2mps11.txt
mfd: Cleanup mfd-mcp-sa11x0.h header
mfd: max8997: Use "IS_ENABLED(CONFIG_OF)" for DT code.
mfd: twl6030: Fix endianness problem in IRQ handler
mfd: sec-core: Add cells for S5M8767-clocks
mfd: max14577: Remove redundant of_match_ptr helper
mfd: twl6040: Fix sparse non static symbol warning
mfd: Revert "mfd: Always assign of_node in mfd_add_device()"
mfd: rtsx: Fix sparse non static symbol warning
mfd: max77693: Set proper maximum register for MUIC regmap
mfd: max77686: Fix regmap resource leak on driver remove
mfd: Represent correct filenames in file headers
mfd: rtsx: Add support for card reader rtl8402
mfd: rtsx: Add set pull control macro and simplify rtl8411
mfd: max8997: Enforce mfd_add_devices() return value check
mfd: mc13xxx: Simplify probe() & remove()
...
Diffstat (limited to 'drivers')
86 files changed, 1669 insertions, 586 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 25ce03eff6ab..50cc557abe41 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -406,6 +406,14 @@ config GPIO_ARIZONA help Support for GPIOs on Wolfson Arizona class devices. +config GPIO_LP3943 + tristate "TI/National Semiconductor LP3943 GPIO expander" + depends on MFD_LP3943 + help + GPIO driver for LP3943 MFD. + LP3943 can be used as a GPIO expander which provides up to 16 GPIOs. + Open drain outputs are required for this usage. + config GPIO_MAX7300 tristate "Maxim MAX7300 GPIO expander" depends on I2C diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c44fffac9519..0248471402e4 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o obj-$(CONFIG_GPIO_INTEL_MID) += gpio-intel-mid.o +obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o diff --git a/drivers/gpio/gpio-lp3943.c b/drivers/gpio/gpio-lp3943.c new file mode 100644 index 000000000000..a0341c92bcb4 --- /dev/null +++ b/drivers/gpio/gpio-lp3943.c @@ -0,0 +1,242 @@ +/* + * TI/National Semiconductor LP3943 GPIO driver + * + * Copyright 2013 Texas Instruments + * + * Author: Milo Kim <milo.kim@ti.com> + * + * 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; version 2. + */ + +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/mfd/lp3943.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +enum lp3943_gpios { + LP3943_GPIO1, + LP3943_GPIO2, + LP3943_GPIO3, + LP3943_GPIO4, + LP3943_GPIO5, + LP3943_GPIO6, + LP3943_GPIO7, + LP3943_GPIO8, + LP3943_GPIO9, + LP3943_GPIO10, + LP3943_GPIO11, + LP3943_GPIO12, + LP3943_GPIO13, + LP3943_GPIO14, + LP3943_GPIO15, + LP3943_GPIO16, + LP3943_MAX_GPIO, +}; + +struct lp3943_gpio { + struct gpio_chip chip; + struct lp3943 *lp3943; + u16 input_mask; /* 1 = GPIO is input direction, 0 = output */ +}; + +static inline struct lp3943_gpio *to_lp3943_gpio(struct gpio_chip *_chip) +{ + return container_of(_chip, struct lp3943_gpio, chip); +} + +static int lp3943_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + struct lp3943_gpio *lp3943_gpio = to_lp3943_gpio(chip); + struct lp3943 *lp3943 = lp3943_gpio->lp3943; + + /* Return an error if the pin is already assigned */ + if (test_and_set_bit(offset, &lp3943->pin_used)) + return -EBUSY; + + return 0; +} + +static void lp3943_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + struct lp3943_gpio *lp3943_gpio = to_lp3943_gpio(chip); + struct lp3943 *lp3943 = lp3943_gpio->lp3943; + + clear_bit(offset, &lp3943->pin_used); +} + +static int lp3943_gpio_set_mode(struct lp3943_gpio *lp3943_gpio, u8 offset, + u8 val) +{ + struct lp3943 *lp3943 = lp3943_gpio->lp3943; + const struct lp3943_reg_cfg *mux = lp3943->mux_cfg; + + return lp3943_update_bits(lp3943, mux[offset].reg, mux[offset].mask, + val << mux[offset].shift); +} + +static int lp3943_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct lp3943_gpio *lp3943_gpio = to_lp3943_gpio(chip); + + lp3943_gpio->input_mask |= BIT(offset); + + return lp3943_gpio_set_mode(lp3943_gpio, offset, LP3943_GPIO_IN); +} + +static int lp3943_get_gpio_in_status(struct lp3943_gpio *lp3943_gpio, + struct gpio_chip *chip, unsigned offset) +{ + u8 addr, read; + int err; + + switch (offset) { + case LP3943_GPIO1 ... LP3943_GPIO8: + addr = LP3943_REG_GPIO_A; + break; + case LP3943_GPIO9 ... LP3943_GPIO16: + addr = LP3943_REG_GPIO_B; + offset = offset - 8; + break; + default: + return -EINVAL; + } + + err = lp3943_read_byte(lp3943_gpio->lp3943, addr, &read); + if (err) + return err; + + return !!(read & BIT(offset)); +} + +static int lp3943_get_gpio_out_status(struct lp3943_gpio *lp3943_gpio, + struct gpio_chip *chip, unsigned offset) +{ + struct lp3943 *lp3943 = lp3943_gpio->lp3943; + const struct lp3943_reg_cfg *mux = lp3943->mux_cfg; + u8 read; + int err; + + err = lp3943_read_byte(lp3943, mux[offset].reg, &read); + if (err) + return err; + + read = (read & mux[offset].mask) >> mux[offset].shift; + + if (read == LP3943_GPIO_OUT_HIGH) + return 1; + else if (read == LP3943_GPIO_OUT_LOW) + return 0; + else + return -EINVAL; +} + +static int lp3943_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct lp3943_gpio *lp3943_gpio = to_lp3943_gpio(chip); + + /* + * Limitation: + * LP3943 doesn't have the GPIO direction register. It provides + * only input and output status registers. + * So, direction info is required to handle the 'get' operation. + * This variable is updated whenever the direction is changed and + * it is used here. + */ + + if (lp3943_gpio->input_mask & BIT(offset)) + return lp3943_get_gpio_in_status(lp3943_gpio, chip, offset); + else + return lp3943_get_gpio_out_status(lp3943_gpio, chip, offset); +} + +static void lp3943_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct lp3943_gpio *lp3943_gpio = to_lp3943_gpio(chip); + u8 data; + + if (value) + data = LP3943_GPIO_OUT_HIGH; + else + data = LP3943_GPIO_OUT_LOW; + + lp3943_gpio_set_mode(lp3943_gpio, offset, data); +} + +static int lp3943_gpio_direction_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct lp3943_gpio *lp3943_gpio = to_lp3943_gpio(chip); + + lp3943_gpio_set(chip, offset, value); + lp3943_gpio->input_mask &= ~BIT(offset); + + return 0; +} + +static const struct gpio_chip lp3943_gpio_chip = { + .label = "lp3943", + .owner = THIS_MODULE, + .request = lp3943_gpio_request, + .free = lp3943_gpio_free, + .direction_input = lp3943_gpio_direction_input, + .get = lp3943_gpio_get, + .direction_output = lp3943_gpio_direction_output, + .set = lp3943_gpio_set, + .base = -1, + .ngpio = LP3943_MAX_GPIO, + .can_sleep = 1, +}; + +static int lp3943_gpio_probe(struct platform_device *pdev) +{ + struct lp3943 *lp3943 = dev_get_drvdata(pdev->dev.parent); + struct lp3943_gpio *lp3943_gpio; + + lp3943_gpio = devm_kzalloc(&pdev->dev, sizeof(*lp3943_gpio), + GFP_KERNEL); + if (!lp3943_gpio) + return -ENOMEM; + + lp3943_gpio->lp3943 = lp3943; + lp3943_gpio->chip = lp3943_gpio_chip; + lp3943_gpio->chip.dev = &pdev->dev; + + platform_set_drvdata(pdev, lp3943_gpio); + + return gpiochip_add(&lp3943_gpio->chip); +} + +static int lp3943_gpio_remove(struct platform_device *pdev) +{ + struct lp3943_gpio *lp3943_gpio = platform_get_drvdata(pdev); + + return gpiochip_remove(&lp3943_gpio->chip); +} + +static const struct of_device_id lp3943_gpio_of_match[] = { + { .compatible = "ti,lp3943-gpio", }, + { } +}; +MODULE_DEVICE_TABLE(of, lp3943_gpio_of_match); + +static struct platform_driver lp3943_gpio_driver = { + .probe = lp3943_gpio_probe, + .remove = lp3943_gpio_remove, + .driver = { + .name = "lp3943-gpio", + .owner = THIS_MODULE, + .of_match_table = lp3943_gpio_of_match, + }, +}; +module_platform_driver(lp3943_gpio_driver); + +MODULE_DESCRIPTION("LP3943 GPIO driver"); +MODULE_ALIAS("platform:lp3943-gpio"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL"); diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index d4d748214e4b..31e786e3999b 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -60,6 +60,24 @@ static u32 get_adc_step_mask(struct tiadc_device *adc_dev) return step_en; } +static u32 get_adc_chan_step_mask(struct tiadc_device *adc_dev, + struct iio_chan_spec const *chan) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(adc_dev->channel_step); i++) { + if (chan->channel == adc_dev->channel_line[i]) { + u32 step; + + step = adc_dev->channel_step[i]; + /* +1 for the charger */ + return 1 << (step + 1); + } + } + WARN_ON(1); + return 0; +} + static u32 get_adc_step_bit(struct tiadc_device *adc_dev, int chan) { return 1 << adc_dev->channel_step[chan]; @@ -181,7 +199,7 @@ static int tiadc_buffer_postenable(struct iio_dev *indio_dev) enb |= (get_adc_step_bit(adc_dev, bit) << 1); adc_dev->buffer_en_ch_steps = enb; - am335x_tsc_se_set(adc_dev->mfd_tscadc, enb); + am335x_tsc_se_set_cache(adc_dev->mfd_tscadc, enb); tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1THRES | IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW); @@ -199,6 +217,7 @@ static int tiadc_buffer_predisable(struct iio_dev *indio_dev) tiadc_writel(adc_dev, REG_IRQCLR, (IRQENB_FIFO1THRES | IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW)); am335x_tsc_se_clr(adc_dev->mfd_tscadc, adc_dev->buffer_en_ch_steps); + adc_dev->buffer_en_ch_steps = 0; /* Flush FIFO of leftover data in the time it takes to disable adc */ fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT); @@ -328,34 +347,43 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, unsigned int fifo1count, read, stepid; bool found = false; u32 step_en; - unsigned long timeout = jiffies + usecs_to_jiffies - (IDLE_TIMEOUT * adc_dev->channels); + unsigned long timeout; if (iio_buffer_enabled(indio_dev)) return -EBUSY; - step_en = get_adc_step_mask(adc_dev); - am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en); + step_en = get_adc_chan_step_mask(adc_dev, chan); + if (!step_en) + return -EINVAL; + + fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT); + while (fifo1count--) + tiadc_readl(adc_dev, REG_FIFO1); + + am335x_tsc_se_set_once(adc_dev->mfd_tscadc, step_en); - /* Wait for ADC sequencer to complete sampling */ - while (tiadc_readl(adc_dev, REG_ADCFSM) & SEQ_STATUS) { - if (time_after(jiffies, timeout)) + timeout = jiffies + usecs_to_jiffies + (IDLE_TIMEOUT * adc_dev->channels); + /* Wait for Fifo threshold interrupt */ + while (1) { + fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT); + if (fifo1count) + break; + + if (time_after(jiffies, timeout)) { + am335x_tsc_se_adc_done(adc_dev->mfd_tscadc); return -EAGAIN; } + } map_val = chan->channel + TOTAL_CHANNELS; /* - * When the sub-system is first enabled, - * the sequencer will always start with the - * lowest step (1) and continue until step (16). - * For ex: If we have enabled 4 ADC channels and - * currently use only 1 out of them, the - * sequencer still configures all the 4 steps, - * leading to 3 unwanted data. - * Hence we need to flush out this data. + * We check the complete FIFO. We programmed just one entry but in case + * something went wrong we left empty handed (-EAGAIN previously) and + * then the value apeared somehow in the FIFO we would have two entries. + * Therefore we read every item and keep only the latest version of the + * requested channel. */ - - fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT); for (i = 0; i < fifo1count; i++) { read = tiadc_readl(adc_dev, REG_FIFO1); stepid = read & FIFOREAD_CHNLID_MASK; @@ -367,6 +395,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, *val = (u16) read; } } + am335x_tsc_se_adc_done(adc_dev->mfd_tscadc); if (found == false) return -EBUSY; @@ -494,7 +523,8 @@ static int tiadc_resume(struct device *dev) tiadc_writel(adc_dev, REG_CTRL, restore); tiadc_step_config(indio_dev); - + am335x_tsc_se_set_cache(adc_dev->mfd_tscadc, |