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651 lines
15 KiB
651 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Access to GPIOs on TWL4030/TPS659x0 chips |
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* |
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* Copyright (C) 2006-2007 Texas Instruments, Inc. |
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* Copyright (C) 2006 MontaVista Software, Inc. |
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* |
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* Code re-arranged and cleaned up by: |
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* Syed Mohammed Khasim <[email protected]> |
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* |
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* Initial Code: |
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* Andy Lowe / Nishanth Menon |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/kthread.h> |
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#include <linux/irq.h> |
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#include <linux/gpio/driver.h> |
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#include <linux/platform_device.h> |
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#include <linux/of.h> |
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#include <linux/irqdomain.h> |
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#include <linux/mfd/twl.h> |
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|
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/* |
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* The GPIO "subchip" supports 18 GPIOs which can be configured as |
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* inputs or outputs, with pullups or pulldowns on each pin. Each |
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* GPIO can trigger interrupts on either or both edges. |
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* |
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* GPIO interrupts can be fed to either of two IRQ lines; this is |
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* intended to support multiple hosts. |
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* |
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* There are also two LED pins used sometimes as output-only GPIOs. |
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*/ |
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|
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/* genirq interfaces are not available to modules */ |
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#ifdef MODULE |
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#define is_module() true |
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#else |
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#define is_module() false |
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#endif |
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/* GPIO_CTRL Fields */ |
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#define MASK_GPIO_CTRL_GPIO0CD1 BIT(0) |
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#define MASK_GPIO_CTRL_GPIO1CD2 BIT(1) |
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#define MASK_GPIO_CTRL_GPIO_ON BIT(2) |
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|
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/* Mask for GPIO registers when aggregated into a 32-bit integer */ |
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#define GPIO_32_MASK 0x0003ffff |
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struct gpio_twl4030_priv { |
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struct gpio_chip gpio_chip; |
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struct mutex mutex; |
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int irq_base; |
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|
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/* Bitfields for state caching */ |
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unsigned int usage_count; |
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unsigned int direction; |
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unsigned int out_state; |
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}; |
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|
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/*----------------------------------------------------------------------*/ |
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|
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/* |
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* To configure TWL4030 GPIO module registers |
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*/ |
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static inline int gpio_twl4030_write(u8 address, u8 data) |
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{ |
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return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address); |
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} |
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|
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/*----------------------------------------------------------------------*/ |
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|
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/* |
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* LED register offsets from TWL_MODULE_LED base |
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* PWMs A and B are dedicated to LEDs A and B, respectively. |
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*/ |
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#define TWL4030_LED_LEDEN_REG 0x00 |
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#define TWL4030_PWMAON_REG 0x01 |
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#define TWL4030_PWMAOFF_REG 0x02 |
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#define TWL4030_PWMBON_REG 0x03 |
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#define TWL4030_PWMBOFF_REG 0x04 |
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|
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/* LEDEN bits */ |
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#define LEDEN_LEDAON BIT(0) |
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#define LEDEN_LEDBON BIT(1) |
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#define LEDEN_LEDAEXT BIT(2) |
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#define LEDEN_LEDBEXT BIT(3) |
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#define LEDEN_LEDAPWM BIT(4) |
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#define LEDEN_LEDBPWM BIT(5) |
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#define LEDEN_PWM_LENGTHA BIT(6) |
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#define LEDEN_PWM_LENGTHB BIT(7) |
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#define PWMxON_LENGTH BIT(7) |
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/*----------------------------------------------------------------------*/ |
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/* |
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* To read a TWL4030 GPIO module register |
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*/ |
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static inline int gpio_twl4030_read(u8 address) |
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{ |
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u8 data; |
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int ret = 0; |
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ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address); |
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return (ret < 0) ? ret : data; |
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} |
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/*----------------------------------------------------------------------*/ |
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static u8 cached_leden; |
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/* The LED lines are open drain outputs ... a FET pulls to GND, so an |
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* external pullup is needed. We could also expose the integrated PWM |
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* as a LED brightness control; we initialize it as "always on". |
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*/ |
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static void twl4030_led_set_value(int led, int value) |
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{ |
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u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM; |
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if (led) |
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mask <<= 1; |
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if (value) |
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cached_leden &= ~mask; |
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else |
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cached_leden |= mask; |
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WARN_ON_ONCE(twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden, |
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TWL4030_LED_LEDEN_REG)); |
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} |
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static int twl4030_set_gpio_direction(int gpio, int is_input) |
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{ |
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u8 d_bnk = gpio >> 3; |
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u8 d_msk = BIT(gpio & 0x7); |
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u8 reg = 0; |
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u8 base = REG_GPIODATADIR1 + d_bnk; |
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int ret = 0; |
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ret = gpio_twl4030_read(base); |
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if (ret >= 0) { |
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if (is_input) |
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reg = ret & ~d_msk; |
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else |
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reg = ret | d_msk; |
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ret = gpio_twl4030_write(base, reg); |
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} |
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return ret; |
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} |
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static int twl4030_get_gpio_direction(int gpio) |
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{ |
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u8 d_bnk = gpio >> 3; |
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u8 d_msk = BIT(gpio & 0x7); |
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u8 base = REG_GPIODATADIR1 + d_bnk; |
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int ret = 0; |
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ret = gpio_twl4030_read(base); |
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if (ret < 0) |
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return ret; |
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if (ret & d_msk) |
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return GPIO_LINE_DIRECTION_OUT; |
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return GPIO_LINE_DIRECTION_IN; |
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} |
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static int twl4030_set_gpio_dataout(int gpio, int enable) |
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{ |
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u8 d_bnk = gpio >> 3; |
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u8 d_msk = BIT(gpio & 0x7); |
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u8 base = 0; |
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if (enable) |
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base = REG_SETGPIODATAOUT1 + d_bnk; |
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else |
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base = REG_CLEARGPIODATAOUT1 + d_bnk; |
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return gpio_twl4030_write(base, d_msk); |
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} |
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static int twl4030_get_gpio_datain(int gpio) |
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{ |
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u8 d_bnk = gpio >> 3; |
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u8 d_off = gpio & 0x7; |
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u8 base = 0; |
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int ret = 0; |
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base = REG_GPIODATAIN1 + d_bnk; |
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ret = gpio_twl4030_read(base); |
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if (ret > 0) |
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ret = (ret >> d_off) & 0x1; |
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return ret; |
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} |
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/*----------------------------------------------------------------------*/ |
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static int twl_request(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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int status = 0; |
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mutex_lock(&priv->mutex); |
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/* Support the two LED outputs as output-only GPIOs. */ |
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if (offset >= TWL4030_GPIO_MAX) { |
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u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT |
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| LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA; |
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u8 reg = TWL4030_PWMAON_REG; |
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offset -= TWL4030_GPIO_MAX; |
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if (offset) { |
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ledclr_mask <<= 1; |
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reg = TWL4030_PWMBON_REG; |
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} |
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/* initialize PWM to always-drive */ |
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/* Configure PWM OFF register first */ |
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status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg + 1); |
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if (status < 0) |
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goto done; |
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/* Followed by PWM ON register */ |
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status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg); |
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if (status < 0) |
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goto done; |
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/* init LED to not-driven (high) */ |
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status = twl_i2c_read_u8(TWL4030_MODULE_LED, &cached_leden, |
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TWL4030_LED_LEDEN_REG); |
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if (status < 0) |
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goto done; |
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cached_leden &= ~ledclr_mask; |
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status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden, |
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TWL4030_LED_LEDEN_REG); |
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if (status < 0) |
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goto done; |
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status = 0; |
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goto done; |
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} |
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/* on first use, turn GPIO module "on" */ |
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if (!priv->usage_count) { |
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struct twl4030_gpio_platform_data *pdata; |
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u8 value = MASK_GPIO_CTRL_GPIO_ON; |
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|
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/* optionally have the first two GPIOs switch vMMC1 |
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* and vMMC2 power supplies based on card presence. |
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*/ |
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pdata = dev_get_platdata(chip->parent); |
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if (pdata) |
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value |= pdata->mmc_cd & 0x03; |
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status = gpio_twl4030_write(REG_GPIO_CTRL, value); |
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} |
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done: |
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if (!status) |
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priv->usage_count |= BIT(offset); |
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mutex_unlock(&priv->mutex); |
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return status; |
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} |
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static void twl_free(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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mutex_lock(&priv->mutex); |
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if (offset >= TWL4030_GPIO_MAX) { |
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twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1); |
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goto out; |
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} |
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priv->usage_count &= ~BIT(offset); |
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/* on last use, switch off GPIO module */ |
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if (!priv->usage_count) |
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gpio_twl4030_write(REG_GPIO_CTRL, 0x0); |
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out: |
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mutex_unlock(&priv->mutex); |
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} |
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static int twl_direction_in(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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int ret; |
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mutex_lock(&priv->mutex); |
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if (offset < TWL4030_GPIO_MAX) |
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ret = twl4030_set_gpio_direction(offset, 1); |
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else |
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ret = -EINVAL; /* LED outputs can't be set as input */ |
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if (!ret) |
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priv->direction &= ~BIT(offset); |
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mutex_unlock(&priv->mutex); |
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return ret; |
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} |
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static int twl_get(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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int ret; |
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int status = 0; |
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mutex_lock(&priv->mutex); |
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if (!(priv->usage_count & BIT(offset))) { |
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ret = -EPERM; |
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goto out; |
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} |
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if (priv->direction & BIT(offset)) |
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status = priv->out_state & BIT(offset); |
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else |
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status = twl4030_get_gpio_datain(offset); |
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ret = (status < 0) ? status : !!status; |
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out: |
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mutex_unlock(&priv->mutex); |
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return ret; |
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} |
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static void twl_set(struct gpio_chip *chip, unsigned offset, int value) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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mutex_lock(&priv->mutex); |
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if (offset < TWL4030_GPIO_MAX) |
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twl4030_set_gpio_dataout(offset, value); |
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else |
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twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value); |
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if (value) |
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priv->out_state |= BIT(offset); |
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else |
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priv->out_state &= ~BIT(offset); |
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mutex_unlock(&priv->mutex); |
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} |
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static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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int ret = 0; |
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mutex_lock(&priv->mutex); |
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if (offset < TWL4030_GPIO_MAX) { |
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ret = twl4030_set_gpio_direction(offset, 0); |
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if (ret) { |
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mutex_unlock(&priv->mutex); |
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return ret; |
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} |
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} |
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/* |
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* LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output |
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*/ |
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priv->direction |= BIT(offset); |
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mutex_unlock(&priv->mutex); |
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twl_set(chip, offset, value); |
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return ret; |
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} |
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static int twl_get_direction(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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/* |
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* Default GPIO_LINE_DIRECTION_OUT |
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* LED GPIOs >= TWL4030_GPIO_MAX are always output |
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*/ |
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int ret = GPIO_LINE_DIRECTION_OUT; |
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mutex_lock(&priv->mutex); |
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if (offset < TWL4030_GPIO_MAX) { |
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ret = twl4030_get_gpio_direction(offset); |
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if (ret) { |
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mutex_unlock(&priv->mutex); |
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return ret; |
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} |
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} |
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mutex_unlock(&priv->mutex); |
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return ret; |
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} |
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static int twl_to_irq(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct gpio_twl4030_priv *priv = gpiochip_get_data(chip); |
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return (priv->irq_base && (offset < TWL4030_GPIO_MAX)) |
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? (priv->irq_base + offset) |
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: -EINVAL; |
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} |
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static const struct gpio_chip template_chip = { |
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.label = "twl4030", |
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.owner = THIS_MODULE, |
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.request = twl_request, |
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.free = twl_free, |
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.direction_input = twl_direction_in, |
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.direction_output = twl_direction_out, |
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.get_direction = twl_get_direction, |
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.get = twl_get, |
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.set = twl_set, |
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.to_irq = twl_to_irq, |
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.can_sleep = true, |
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}; |
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/*----------------------------------------------------------------------*/ |
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static int gpio_twl4030_pulls(u32 ups, u32 downs) |
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{ |
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u8 message[5]; |
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unsigned i, gpio_bit; |
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/* For most pins, a pulldown was enabled by default. |
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* We should have data that's specific to this board. |
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*/ |
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for (gpio_bit = 1, i = 0; i < 5; i++) { |
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u8 bit_mask; |
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unsigned j; |
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for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) { |
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if (ups & gpio_bit) |
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bit_mask |= 1 << (j + 1); |
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else if (downs & gpio_bit) |
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bit_mask |= 1 << (j + 0); |
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} |
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message[i] = bit_mask; |
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} |
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return twl_i2c_write(TWL4030_MODULE_GPIO, message, |
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REG_GPIOPUPDCTR1, 5); |
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} |
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static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd) |
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{ |
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u8 message[3]; |
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/* 30 msec of debouncing is always used for MMC card detect, |
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* and is optional for everything else. |
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*/ |
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message[0] = (debounce & 0xff) | (mmc_cd & 0x03); |
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debounce >>= 8; |
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message[1] = (debounce & 0xff); |
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debounce >>= 8; |
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message[2] = (debounce & 0x03); |
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return twl_i2c_write(TWL4030_MODULE_GPIO, message, |
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REG_GPIO_DEBEN1, 3); |
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} |
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static int gpio_twl4030_remove(struct platform_device *pdev); |
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static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev, |
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struct twl4030_gpio_platform_data *pdata) |
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{ |
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struct twl4030_gpio_platform_data *omap_twl_info; |
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omap_twl_info = devm_kzalloc(dev, sizeof(*omap_twl_info), GFP_KERNEL); |
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if (!omap_twl_info) |
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return NULL; |
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if (pdata) |
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*omap_twl_info = *pdata; |
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omap_twl_info->use_leds = of_property_read_bool(dev->of_node, |
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"ti,use-leds"); |
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of_property_read_u32(dev->of_node, "ti,debounce", |
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&omap_twl_info->debounce); |
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of_property_read_u32(dev->of_node, "ti,mmc-cd", |
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(u32 *)&omap_twl_info->mmc_cd); |
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of_property_read_u32(dev->of_node, "ti,pullups", |
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&omap_twl_info->pullups); |
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of_property_read_u32(dev->of_node, "ti,pulldowns", |
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&omap_twl_info->pulldowns); |
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return omap_twl_info; |
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} |
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static int gpio_twl4030_probe(struct platform_device *pdev) |
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{ |
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struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); |
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struct device_node *node = pdev->dev.of_node; |
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struct gpio_twl4030_priv *priv; |
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int ret, irq_base; |
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priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv), |
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GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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|
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/* maybe setup IRQs */ |
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if (is_module()) { |
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dev_err(&pdev->dev, "can't dispatch IRQs from modules\n"); |
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goto no_irqs; |
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} |
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irq_base = devm_irq_alloc_descs(&pdev->dev, -1, |
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0, TWL4030_GPIO_MAX, 0); |
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if (irq_base < 0) { |
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dev_err(&pdev->dev, "Failed to alloc irq_descs\n"); |
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return irq_base; |
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} |
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irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0, |
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&irq_domain_simple_ops, NULL); |
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ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base); |
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if (ret < 0) |
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return ret; |
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priv->irq_base = irq_base; |
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no_irqs: |
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priv->gpio_chip = template_chip; |
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priv->gpio_chip.base = -1; |
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priv->gpio_chip.ngpio = TWL4030_GPIO_MAX; |
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priv->gpio_chip.parent = &pdev->dev; |
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mutex_init(&priv->mutex); |
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if (node) |
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pdata = of_gpio_twl4030(&pdev->dev, pdata); |
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|
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if (pdata == NULL) { |
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dev_err(&pdev->dev, "Platform data is missing\n"); |
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return -ENXIO; |
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} |
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|
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/* |
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* NOTE: boards may waste power if they don't set pullups |
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* and pulldowns correctly ... default for non-ULPI pins is |
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* pulldown, and some other pins may have external pullups |
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* or pulldowns. Careful! |
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*/ |
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ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns); |
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if (ret) |
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dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n", |
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pdata->pullups, pdata->pulldowns, ret); |
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|
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ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd); |
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if (ret) |
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dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n", |
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pdata->debounce, pdata->mmc_cd, ret); |
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|
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/* |
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* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE, |
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* is (still) clear if use_leds is set. |
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*/ |
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if (pdata->use_leds) |
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priv->gpio_chip.ngpio += 2; |
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|
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ret = gpiochip_add_data(&priv->gpio_chip, priv); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret); |
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priv->gpio_chip.ngpio = 0; |
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gpio_twl4030_remove(pdev); |
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goto out; |
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} |
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|
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platform_set_drvdata(pdev, priv); |
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|
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if (pdata->setup) { |
|
int status; |
|
|
|
status = pdata->setup(&pdev->dev, priv->gpio_chip.base, |
|
TWL4030_GPIO_MAX); |
|
if (status) |
|
dev_dbg(&pdev->dev, "setup --> %d\n", status); |
|
} |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/* Cannot use as gpio_twl4030_probe() calls us */ |
|
static int gpio_twl4030_remove(struct platform_device *pdev) |
|
{ |
|
struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); |
|
struct gpio_twl4030_priv *priv = platform_get_drvdata(pdev); |
|
int status; |
|
|
|
if (pdata && pdata->teardown) { |
|
status = pdata->teardown(&pdev->dev, priv->gpio_chip.base, |
|
TWL4030_GPIO_MAX); |
|
if (status) { |
|
dev_dbg(&pdev->dev, "teardown --> %d\n", status); |
|
return status; |
|
} |
|
} |
|
|
|
gpiochip_remove(&priv->gpio_chip); |
|
|
|
if (is_module()) |
|
return 0; |
|
|
|
/* REVISIT no support yet for deregistering all the IRQs */ |
|
WARN_ON(1); |
|
return -EIO; |
|
} |
|
|
|
static const struct of_device_id twl_gpio_match[] = { |
|
{ .compatible = "ti,twl4030-gpio", }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, twl_gpio_match); |
|
|
|
/* 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", |
|
.of_match_table = twl_gpio_match, |
|
}, |
|
.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");
|
|
|