diff options
Diffstat (limited to 'drivers/gpio/twl4030-gpio.c')
| -rw-r--r-- | drivers/gpio/twl4030-gpio.c | 513 |
1 files changed, 0 insertions, 513 deletions
diff --git a/drivers/gpio/twl4030-gpio.c b/drivers/gpio/twl4030-gpio.c deleted file mode 100644 index 57635ac35a7..00000000000 --- a/drivers/gpio/twl4030-gpio.c +++ /dev/null @@ -1,513 +0,0 @@ -/* - * twl4030_gpio.c -- access to GPIOs on TWL4030/TPS659x0 chips - * - * Copyright (C) 2006-2007 Texas Instruments, Inc. - * Copyright (C) 2006 MontaVista Software, Inc. - * - * Code re-arranged and cleaned up by: - * Syed Mohammed Khasim <x0khasim@ti.com> - * - * Initial Code: - * Andy Lowe / Nishanth Menon - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/kthread.h> -#include <linux/irq.h> -#include <linux/gpio.h> -#include <linux/platform_device.h> - -#include <linux/i2c/twl.h> - - -/* - * The GPIO "subchip" supports 18 GPIOs which can be configured as - * inputs or outputs, with pullups or pulldowns on each pin. Each - * GPIO can trigger interrupts on either or both edges. - * - * GPIO interrupts can be fed to either of two IRQ lines; this is - * intended to support multiple hosts. - * - * There are also two LED pins used sometimes as output-only GPIOs. - */ - - -static struct gpio_chip twl_gpiochip; -static int twl4030_gpio_irq_base; - -/* genirq interfaces are not available to modules */ -#ifdef MODULE -#define is_module() true -#else -#define is_module() false -#endif - -/* GPIO_CTRL Fields */ -#define MASK_GPIO_CTRL_GPIO0CD1 BIT(0) -#define MASK_GPIO_CTRL_GPIO1CD2 BIT(1) -#define MASK_GPIO_CTRL_GPIO_ON BIT(2) - -/* Mask for GPIO registers when aggregated into a 32-bit integer */ -#define GPIO_32_MASK 0x0003ffff - -/* Data structures */ -static DEFINE_MUTEX(gpio_lock); - -/* store usage of each GPIO. - each bit represents one GPIO */ -static unsigned int gpio_usage_count; - -/*----------------------------------------------------------------------*/ - -/* - * To configure TWL4030 GPIO module registers - */ -static inline int gpio_twl4030_write(u8 address, u8 data) -{ - return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address); -} - -/*----------------------------------------------------------------------*/ - -/* - * LED register offsets (use TWL4030_MODULE_{LED,PWMA,PWMB})) - * PWMs A and B are dedicated to LEDs A and B, respectively. - */ - -#define TWL4030_LED_LEDEN 0x0 - -/* LEDEN bits */ -#define LEDEN_LEDAON BIT(0) -#define LEDEN_LEDBON BIT(1) -#define LEDEN_LEDAEXT BIT(2) -#define LEDEN_LEDBEXT BIT(3) -#define LEDEN_LEDAPWM BIT(4) -#define LEDEN_LEDBPWM BIT(5) -#define LEDEN_PWM_LENGTHA BIT(6) -#define LEDEN_PWM_LENGTHB BIT(7) - -#define TWL4030_PWMx_PWMxON 0x0 -#define TWL4030_PWMx_PWMxOFF 0x1 - -#define PWMxON_LENGTH BIT(7) - -/*----------------------------------------------------------------------*/ - -/* - * To read a TWL4030 GPIO module register - */ -static inline int gpio_twl4030_read(u8 address) -{ - u8 data; - int ret = 0; - - ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address); - return (ret < 0) ? ret : data; -} - -/*----------------------------------------------------------------------*/ - -static u8 cached_leden; /* protected by gpio_lock */ - -/* The LED lines are open drain outputs ... a FET pulls to GND, so an - * external pullup is needed. We could also expose the integrated PWM - * as a LED brightness control; we initialize it as "always on". - */ -static void twl4030_led_set_value(int led, int value) -{ - u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM; - int status; - - if (led) - mask <<= 1; - - mutex_lock(&gpio_lock); - if (value) - cached_leden &= ~mask; - else - cached_leden |= mask; - status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden, - TWL4030_LED_LEDEN); - mutex_unlock(&gpio_lock); -} - -static int twl4030_set_gpio_direction(int gpio, int is_input) -{ - u8 d_bnk = gpio >> 3; - u8 d_msk = BIT(gpio & 0x7); - u8 reg = 0; - u8 base = REG_GPIODATADIR1 + d_bnk; - int ret = 0; - - mutex_lock(&gpio_lock); - ret = gpio_twl4030_read(base); - if (ret >= 0) { - if (is_input) - reg = ret & ~d_msk; - else - reg = ret | d_msk; - - ret = gpio_twl4030_write(base, reg); - } - mutex_unlock(&gpio_lock); - return ret; -} - -static int twl4030_set_gpio_dataout(int gpio, int enable) -{ - u8 d_bnk = gpio >> 3; - u8 d_msk = BIT(gpio & 0x7); - u8 base = 0; - - if (enable) - base = REG_SETGPIODATAOUT1 + d_bnk; - else - base = REG_CLEARGPIODATAOUT1 + d_bnk; - - return gpio_twl4030_write(base, d_msk); -} - -static int twl4030_get_gpio_datain(int gpio) -{ - u8 d_bnk = gpio >> 3; - u8 d_off = gpio & 0x7; - u8 base = 0; - int ret = 0; - - if (unlikely((gpio >= TWL4030_GPIO_MAX) - || !(gpio_usage_count & BIT(gpio)))) - return -EPERM; - - base = REG_GPIODATAIN1 + d_bnk; - ret = gpio_twl4030_read(base); - if (ret > 0) - ret = (ret >> d_off) & 0x1; - - return ret; -} - -/*----------------------------------------------------------------------*/ - -static int twl_request(struct gpio_chip *chip, unsigned offset) -{ - int status = 0; - - mutex_lock(&gpio_lock); - - /* Support the two LED outputs as output-only GPIOs. */ - if (offset >= TWL4030_GPIO_MAX) { - u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT - | LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA; - u8 module = TWL4030_MODULE_PWMA; - - offset -= TWL4030_GPIO_MAX; - if (offset) { - ledclr_mask <<= 1; - module = TWL4030_MODULE_PWMB; - } - - /* initialize PWM to always-drive */ - status = twl_i2c_write_u8(module, 0x7f, - TWL4030_PWMx_PWMxOFF); - if (status < 0) - goto done; - status = twl_i2c_write_u8(module, 0x7f, - TWL4030_PWMx_PWMxON); - if (status < 0) - goto done; - - /* init LED to not-driven (high) */ - module = TWL4030_MODULE_LED; - status = twl_i2c_read_u8(module, &cached_leden, - TWL4030_LED_LEDEN); - if (status < 0) - goto done; - cached_leden &= ~ledclr_mask; - status = twl_i2c_write_u8(module, cached_leden, - TWL4030_LED_LEDEN); - if (status < 0) - goto done; - - status = 0; - goto done; - } - - /* on first use, turn GPIO module "on" */ - if (!gpio_usage_count) { - struct twl4030_gpio_platform_data *pdata; - u8 value = MASK_GPIO_CTRL_GPIO_ON; - - /* optionally have the first two GPIOs switch vMMC1 - * and vMMC2 power supplies based on card presence. - */ - pdata = chip->dev->platform_data; - value |= pdata->mmc_cd & 0x03; - - status = gpio_twl4030_write(REG_GPIO_CTRL, value); - } - - if (!status) - gpio_usage_count |= (0x1 << offset); - -done: - mutex_unlock(&gpio_lock); - return status; -} - -static void twl_free(struct gpio_chip *chip, unsigned offset) -{ - if (offset >= TWL4030_GPIO_MAX) { - twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1); - return; - } - - mutex_lock(&gpio_lock); - - gpio_usage_count &= ~BIT(offset); - - /* on last use, switch off GPIO module */ - if (!gpio_usage_count) - gpio_twl4030_write(REG_GPIO_CTRL, 0x0); - - mutex_unlock(&gpio_lock); -} - -static int twl_direction_in(struct gpio_chip *chip, unsigned offset) -{ - return (offset < TWL4030_GPIO_MAX) - ? twl4030_set_gpio_direction(offset, 1) - : -EINVAL; -} - -static int twl_get(struct gpio_chip *chip, unsigned offset) -{ - int status = 0; - - if (offset < TWL4030_GPIO_MAX) - status = twl4030_get_gpio_datain(offset); - else if (offset == TWL4030_GPIO_MAX) - status = cached_leden & LEDEN_LEDAON; - else - status = cached_leden & LEDEN_LEDBON; - return (status < 0) ? 0 : status; -} - -static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value) -{ - if (offset < TWL4030_GPIO_MAX) { - twl4030_set_gpio_dataout(offset, value); - return twl4030_set_gpio_direction(offset, 0); - } else { - twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value); - return 0; - } -} - -static void twl_set(struct gpio_chip *chip, unsigned offset, int value) -{ - if (offset < TWL4030_GPIO_MAX) - twl4030_set_gpio_dataout(offset, value); - else - twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value); -} - -static int twl_to_irq(struct gpio_chip *chip, unsigned offset) -{ - return (twl4030_gpio_irq_base && (offset < TWL4030_GPIO_MAX)) - ? (twl4030_gpio_irq_base + offset) - : -EINVAL; -} - -static struct gpio_chip twl_gpiochip = { - .label = "twl4030", - .owner = THIS_MODULE, - .request = twl_request, - .free = twl_free, - .direction_input = twl_direction_in, - .get = twl_get, - .direction_output = twl_direction_out, - .set = twl_set, - .to_irq = twl_to_irq, - .can_sleep = 1, -}; - -/*----------------------------------------------------------------------*/ - -static int __devinit gpio_twl4030_pulls(u32 ups, u32 downs) -{ - u8 message[6]; - unsigned i, gpio_bit; - - /* For most pins, a pulldown was enabled by default. - * We should have data that's specific to this board. - */ - for (gpio_bit = 1, i = 1; i < 6; i++) { - u8 bit_mask; - unsigned j; - - for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) { - if (ups & gpio_bit) - bit_mask |= 1 << (j + 1); - else if (downs & gpio_bit) - bit_mask |= 1 << (j + 0); - } - message[i] = bit_mask; - } - - return twl_i2c_write(TWL4030_MODULE_GPIO, message, - REG_GPIOPUPDCTR1, 5); -} - -static int __devinit gpio_twl4030_debounce(u32 debounce, u8 mmc_cd) -{ - u8 message[4]; - - /* 30 msec of debouncing is always used for MMC card detect, - * and is optional for everything else. - */ - message[1] = (debounce & 0xff) | (mmc_cd & 0x03); - debounce >>= 8; - message[2] = (debounce & 0xff); - debounce >>= 8; - message[3] = (debounce & 0x03); - - return twl_i2c_write(TWL4030_MODULE_GPIO, message, - REG_GPIO_DEBEN1, 3); -} - -static int gpio_twl4030_remove(struct platform_device *pdev); - -static int __devinit gpio_twl4030_probe(struct platform_device *pdev) -{ - struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data; - int ret; - - /* maybe setup IRQs */ - if (pdata->irq_base) { - if (is_module()) { - dev_err(&pdev->dev, - "can't dispatch IRQs from modules\n"); - goto no_irqs; - } - ret = twl4030_sih_setup(TWL4030_MODULE_GPIO); - if (ret < 0) - return ret; - WARN_ON(ret != pdata->irq_base); - twl4030_gpio_irq_base = ret; - } - -no_irqs: - /* - * NOTE: boards may waste power if they don't set pullups - * and pulldowns correctly ... default for non-ULPI pins is - * pulldown, and some other pins may have external pullups - * or pulldowns. Careful! - */ - ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns); - if (ret) - dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n", - pdata->pullups, pdata->pulldowns, - ret); - - ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd); - if (ret) - dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n", - pdata->debounce, pdata->mmc_cd, - ret); - - twl_gpiochip.base = pdata->gpio_base; - twl_gpiochip.ngpio = TWL4030_GPIO_MAX; - twl_gpiochip.dev = &pdev->dev; - - /* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE, - * is (still) clear if use_leds is set. - */ - if (pdata->use_leds) - twl_gpiochip.ngpio += 2; - - ret = gpiochip_add(&twl_gpiochip); - if (ret < 0) { - dev_err(&pdev->dev, - "could not register gpiochip, %d\n", - ret); - twl_gpiochip.ngpio = 0; - gpio_twl4030_remove(pdev); - } else if (pdata->setup) { - int status; - - status = pdata->setup(&pdev->dev, - pdata->gpio_base, TWL4030_GPIO_MAX); - if (status) - dev_dbg(&pdev->dev, "setup --> %d\n", status); - } - - return ret; -} - -/* Cannot use __devexit as gpio_twl4030_probe() calls us */ -static int gpio_twl4030_remove(struct platform_device *pdev) -{ - struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data; - int status; - - if (pdata->teardown) { - status = pdata->teardown(&pdev->dev, - pdata->gpio_base, TWL4030_GPIO_MAX); - if (status) { - dev_dbg(&pdev->dev, "teardown --> %d\n", status); - return status; - } - } - - status = gpiochip_remove(&twl_gpiochip); - if (status < 0) - return status; - - if (is_module()) - return 0; - - /* REVISIT no support yet for deregistering all the IRQs */ - WARN_ON(1); - return -EIO; -} - -/* Note: this hardware lives inside an I2C-based multi-function device. */ -MODULE_ALIAS("platform:twl4030_gpio"); - -static struct platform_driver gpio_twl4030_driver = { - .driver.name = "twl4030_gpio", - .driver.owner = THIS_MODULE, - .probe = gpio_twl4030_probe, - .remove = gpio_twl4030_remove, -}; - -static int __init gpio_twl4030_init(void) -{ - return platform_driver_register(&gpio_twl4030_driver); -} -subsys_initcall(gpio_twl4030_init); - -static void __exit gpio_twl4030_exit(void) -{ - platform_driver_unregister(&gpio_twl4030_driver); -} -module_exit(gpio_twl4030_exit); - -MODULE_AUTHOR("Texas Instruments, Inc."); -MODULE_DESCRIPTION("GPIO interface for TWL4030"); -MODULE_LICENSE("GPL"); |