/* * max3107.c - spi uart protocol driver for Maxim 3107 * Based on max3100.c * by Christian Pellegrin * and max3110.c * by Feng Tang * * Copyright (C) Aavamobile 2009 * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #include #include #include #include #include #include #include #include #include #include "max3107.h" /* GPIO direction to input function */ static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset) { struct max3107_port *s = container_of(chip, struct max3107_port, chip); u16 buf[1]; /* Buffer for SPI transfer */ if (offset >= MAX3107_GPIO_COUNT) { dev_err(&s->spi->dev, "Invalid GPIO\n"); return -EINVAL; } /* Read current GPIO configuration register */ buf[0] = MAX3107_GPIOCFG_REG; /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) { dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n"); return -EIO; } buf[0] &= MAX3107_SPI_RX_DATA_MASK; /* Set GPIO to input */ buf[0] &= ~(0x0001 << offset); /* Write new GPIO configuration register value */ buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG); /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, NULL, 2)) { dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n"); return -EIO; } return 0; } /* GPIO direction to output function */ static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset, int value) { struct max3107_port *s = container_of(chip, struct max3107_port, chip); u16 buf[2]; /* Buffer for SPI transfers */ if (offset >= MAX3107_GPIO_COUNT) { dev_err(&s->spi->dev, "Invalid GPIO\n"); return -EINVAL; } /* Read current GPIO configuration and data registers */ buf[0] = MAX3107_GPIOCFG_REG; buf[1] = MAX3107_GPIODATA_REG; /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) { dev_err(&s->spi->dev, "SPI transfer gpio failed\n"); return -EIO; } buf[0] &= MAX3107_SPI_RX_DATA_MASK; buf[1] &= MAX3107_SPI_RX_DATA_MASK; /* Set GPIO to output */ buf[0] |= (0x0001 << offset); /* Set value */ if (value) buf[1] |= (0x0001 << offset); else buf[1] &= ~(0x0001 << offset); /* Write new GPIO configuration and data register values */ buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG); buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG); /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, NULL, 4)) { dev_err(&s->spi->dev, "SPI transfer for GPIO conf data w failed\n"); return -EIO; } return 0; } /* GPIO value query function */ static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset) { struct max3107_port *s = container_of(chip, struct max3107_port, chip); u16 buf[1]; /* Buffer for SPI transfer */ if (offset >= MAX3107_GPIO_COUNT) { dev_err(&s->spi->dev, "Invalid GPIO\n"); return -EINVAL; } /* Read current GPIO data register */ buf[0] = MAX3107_GPIODATA_REG; /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) { dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n"); return -EIO; } buf[0] &= MAX3107_SPI_RX_DATA_MASK; /* Return value */ return buf[0] & (0x0001 << offset); } /* GPIO value set function */ static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct max3107_port *s = container_of(chip, struct max3107_port, chip); u16 buf[2]; /* Buffer for SPI transfers */ if (offset >= MAX3107_GPIO_COUNT) { dev_err(&s->spi->dev, "Invalid GPIO\n"); return; } /* Read current GPIO configuration registers*/ buf[0] = MAX3107_GPIODATA_REG; buf[1] = MAX3107_GPIOCFG_REG; /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) { dev_err(&s->spi->dev, "SPI transfer for GPIO data and config read failed\n"); return; } buf[0] &= MAX3107_SPI_RX_DATA_MASK; buf[1] &= MAX3107_SPI_RX_DATA_MASK; if (!(buf[1] & (0x0001 << offset))) { /* Configured as input, can't set value */ dev_warn(&s->spi->dev, "Trying to set value for input GPIO\n"); return; } /* Set value */ if (value) buf[0] |= (0x0001 << offset); else buf[0] &= ~(0x0001 << offset); /* Write new GPIO data register value */ buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG); /* Perform SPI transfer */ if (max3107_rw(s, (u8 *)buf, NULL, 2)) dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n"); } /* GPIO chip data */ static struct gpio_chip max3107_gpio_chip = { .owner = THIS_MODULE, .direction_input = max3107_gpio_direction_in, .direction_output = max3107_gpio_direction_out, .get = max3107_gpio_get, .set = max3107_gpio_set, .can_sleep = 1, .base = MAX3107_GPIO_BASE, .ngpio = MAX3107_GPIO_COUNT, }; /** * max3107_aava_reset - reset on AAVA systems * @spi: The SPI device we are probing * * Reset the device ready for probing. */ static int max3107_aava_reset(struct spi_device *spi) { /* Reset the chip */ if (gpio_request(MAX3107_RESET_GPIO, "max3107")) { pr_err("Requesting RESET GPIO failed\n"); return -EIO; } if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) { pr_err("Setting RESET GPIO to 0 failed\n"); gpio_free(MAX3107_RESET_GPIO); return -EIO; } msleep(MAX3107_RESET_DELAY); if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) { pr_err("Setting RESET GPIO to 1 failed\n"); gpio_free(MAX3107_RESET_GPIO); return -EIO; } gpio_free(MAX3107_RESET_GPIO); msleep(MAX3107_WAKEUP_DELAY); return 0; } static int max3107_aava_configure(struct max3107_port *s) { int retval; /* Initialize GPIO chip data */ s->chip = max3107_gpio_chip; s->chip.label = s->spi->modalias; s->chip.dev = &s->spi->dev; /* Add GPIO chip */ retval = gpiochip_add(&s->chip); if (retval) { dev_err(&s->spi->dev, "Adding GPIO chip failed\n"); return retval; } /* Temporary fix for EV2 boot problems, set modem reset to 0 */ max3107_gpio_direction_out(&s->chip, 3, 0); return 0; } #if 0 /* This will get enabled once we have the board stuff merged for this specific case */ static const struct baud_table brg13_ext[] = { { 300, MAX3107_BRG13_B300 }, { 600, MAX3107_BRG13_B600 }, { 1200, MAX3107_BRG13_B1200 }, { 2400, MAX3107_BRG13_B2400 }, { 4800, MAX3107_BRG13_B4800 }, { 9600, MAX3107_BRG13_B9600 }, { 19200, MAX3107_BRG13_B19200 }, { 57600, MAX3107_BRG13_B57600 }, { 115200, MAX3107_BRG13_B115200 }, { 230400, MAX3107_BRG13_B230400 }, { 460800, MAX3107_BRG13_B460800 }, { 921600, MAX3107_BRG13_B921600 }, { 0, 0 } }; static void max3107_aava_init(struct max3107_port *s) { /*override for AAVA SC specific*/ if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) { if (get_koski_build_id() <= KOSKI_EV2) if (s->ext_clk) { s->brg_cfg = MAX3107_BRG13_B9600; s->baud_tbl = (struct baud_table *)brg13_ext; } } } #endif static int __devexit max3107_aava_remove(struct spi_device *spi) { struct max3107_port *s = dev_get_drvdata(&spi->dev); /* Remove GPIO chip */ if (gpiochip_remove(&s->chip)) dev_warn(&spi->dev, "Removing GPIO chip failed\n"); /* Then do the default remove */ return max3107_remove(spi); } /* Platform data */ static struct max3107_plat aava_plat_data = { .loopback = 0, .ext_clk = 1, /* .init = max3107_aava_init, */ .configure = max3107_aava_configure, .hw_suspend = max3107_hw_susp, .polled_mode = 0, .poll_time = 0, }; static int __devinit max3107_probe_aava(struct spi_device *spi) { int err = max3107_aava_reset(spi); if (err < 0) return err; return max3107_probe(spi, &aava_plat_data); } /* Spi driver data */ static struct spi_driver max3107_driver = { .driver = { .name = "aava-max3107", .bus = &spi_bus_type, .owner = THIS_MODULE, }, .probe = max3107_probe_aava, .remove = __devexit_p(max3107_aava_remove), .suspend = max3107_suspend, .resume = max3107_resume, }; /* Driver init function */ static int __init max3107_init(void) { return spi_register_driver(&max3107_driver); } /* Driver exit function */ static void __exit max3107_exit(void) { spi_unregister_driver(&max3107_driver); } module_init(max3107_init); module_exit(max3107_exit); MODULE_DESCRIPTION("MAX3107 driver"); MODULE_AUTHOR("Aavamobile"); MODULE_ALIAS("spi:aava-max3107"); MODULE_LICENSE("GPL v2");