/* * Copyright (C) ST-Ericsson SA 2010 * * License Terms: GNU General Public License, version 2 * Author: Hanumath Prasad for ST-Ericsson * Author: Rabin Vincent for ST-Ericsson */ #include #include #include #include #include #include #include /** * tc35892_reg_read() - read a single TC35892 register * @tc35892: Device to read from * @reg: Register to read */ int tc35892_reg_read(struct tc35892 *tc35892, u8 reg) { int ret; ret = i2c_smbus_read_byte_data(tc35892->i2c, reg); if (ret < 0) dev_err(tc35892->dev, "failed to read reg %#x: %d\n", reg, ret); return ret; } EXPORT_SYMBOL_GPL(tc35892_reg_read); /** * tc35892_reg_read() - write a single TC35892 register * @tc35892: Device to write to * @reg: Register to read * @data: Value to write */ int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data) { int ret; ret = i2c_smbus_write_byte_data(tc35892->i2c, reg, data); if (ret < 0) dev_err(tc35892->dev, "failed to write reg %#x: %d\n", reg, ret); return ret; } EXPORT_SYMBOL_GPL(tc35892_reg_write); /** * tc35892_block_read() - read multiple TC35892 registers * @tc35892: Device to read from * @reg: First register * @length: Number of registers * @values: Buffer to write to */ int tc35892_block_read(struct tc35892 *tc35892, u8 reg, u8 length, u8 *values) { int ret; ret = i2c_smbus_read_i2c_block_data(tc35892->i2c, reg, length, values); if (ret < 0) dev_err(tc35892->dev, "failed to read regs %#x: %d\n", reg, ret); return ret; } EXPORT_SYMBOL_GPL(tc35892_block_read); /** * tc35892_block_write() - write multiple TC35892 registers * @tc35892: Device to write to * @reg: First register * @length: Number of registers * @values: Values to write */ int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length, const u8 *values) { int ret; ret = i2c_smbus_write_i2c_block_data(tc35892->i2c, reg, length, values); if (ret < 0) dev_err(tc35892->dev, "failed to write regs %#x: %d\n", reg, ret); return ret; } EXPORT_SYMBOL_GPL(tc35892_block_write); /** * tc35892_set_bits() - set the value of a bitfield in a TC35892 register * @tc35892: Device to write to * @reg: Register to write * @mask: Mask of bits to set * @values: Value to set */ int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val) { int ret; mutex_lock(&tc35892->lock); ret = tc35892_reg_read(tc35892, reg); if (ret < 0) goto out; ret &= ~mask; ret |= val; ret = tc35892_reg_write(tc35892, reg, ret); out: mutex_unlock(&tc35892->lock); return ret; } EXPORT_SYMBOL_GPL(tc35892_set_bits); static struct resource gpio_resources[] = { { .start = TC35892_INT_GPIIRQ, .end = TC35892_INT_GPIIRQ, .flags = IORESOURCE_IRQ, }, }; static struct mfd_cell tc35892_devs[] = { { .name = "tc35892-gpio", .num_resources = ARRAY_SIZE(gpio_resources), .resources = &gpio_resources[0], }, }; static irqreturn_t tc35892_irq(int irq, void *data) { struct tc35892 *tc35892 = data; int status; status = tc35892_reg_read(tc35892, TC35892_IRQST); if (status < 0) return IRQ_NONE; while (status) { int bit = __ffs(status); handle_nested_irq(tc35892->irq_base + bit); status &= ~(1 << bit); } /* * A dummy read or write (to any register) appears to be necessary to * have the last interrupt clear (for example, GPIO IC write) take * effect. */ tc35892_reg_read(tc35892, TC35892_IRQST); return IRQ_HANDLED; } static void tc35892_irq_dummy(unsigned int irq) { /* No mask/unmask at this level */ } static struct irq_chip tc35892_irq_chip = { .name = "tc35892", .mask = tc35892_irq_dummy, .unmask = tc35892_irq_dummy, }; static int tc35892_irq_init(struct tc35892 *tc35892) { int base = tc35892->irq_base; int irq; for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) { set_irq_chip_data(irq, tc35892); set_irq_chip_and_handler(irq, &tc35892_irq_chip, handle_edge_irq); set_irq_nested_thread(irq, 1); #ifdef CONFIG_ARM set_irq_flags(irq, IRQF_VALID); #else set_irq_noprobe(irq); #endif } return 0; } static void tc35892_irq_remove(struct tc35892 *tc35892) { int base = tc35892->irq_base; int irq; for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) { #ifdef CONFIG_ARM set_irq_flags(irq, 0); #endif set_irq_chip_and_handler(irq, NULL, NULL); set_irq_chip_data(irq, NULL); } } static int tc35892_chip_init(struct tc35892 *tc35892) { int manf, ver, ret; manf = tc35892_reg_read(tc35892, TC35892_MANFCODE); if (manf < 0) return manf; ver = tc35892_reg_read(tc35892, TC35892_VERSION); if (ver < 0) return ver; if (manf != TC35892_MANFCODE_MAGIC) { dev_err(tc35892->dev, "unknown manufacturer: %#x\n", manf); return -EINVAL; } dev_info(tc35892->dev, "manufacturer: %#x, version: %#x\n", manf, ver); /* Put everything except the IRQ module into reset */ ret = tc35892_reg_write(tc35892, TC35892_RSTCTRL, TC35892_RSTCTRL_TIMRST | TC35892_RSTCTRL_ROTRST | TC35892_RSTCTRL_KBDRST | TC35892_RSTCTRL_GPIRST); if (ret < 0) return ret; /* Clear the reset interrupt. */ return tc35892_reg_write(tc35892, TC35892_RSTINTCLR, 0x1); } static int __devinit tc35892_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct tc35892_platform_data *pdata = i2c->dev.platform_data; struct tc35892 *tc35892; int ret; if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) return -EIO; tc35892 = kzalloc(sizeof(struct tc35892), GFP_KERNEL); if (!tc35892) return -ENOMEM; mutex_init(&tc35892->lock); tc35892->dev = &i2c->dev; tc35892->i2c = i2c; tc35892->pdata = pdata; tc35892->irq_base = pdata->irq_base; tc35892->num_gpio = id->driver_data; i2c_set_clientdata(i2c, tc35892); ret = tc35892_chip_init(tc35892); if (ret) goto out_free; ret = tc35892_irq_init(tc35892); if (ret) goto out_free; ret = request_threaded_irq(tc35892->i2c->irq, NULL, tc35892_irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "tc35892", tc35892); if (ret) { dev_err(tc35892->dev, "failed to request IRQ: %d\n", ret); goto out_removeirq; } ret = mfd_add_devices(tc35892->dev, -1, tc35892_devs, ARRAY_SIZE(tc35892_devs), NULL, tc35892->irq_base); if (ret) { dev_err(tc35892->dev, "failed to add children\n"); goto out_freeirq; } return 0; out_freeirq: free_irq(tc35892->i2c->irq, tc35892); out_removeirq: tc35892_irq_remove(tc35892); out_free: kfree(tc35892); return ret; } static int __devexit tc35892_remove(struct i2c_client *client) { struct tc35892 *tc35892 = i2c_get_clientdata(client); mfd_remove_devices(tc35892->dev); free_irq(tc35892->i2c->irq, tc35892); tc35892_irq_remove(tc35892); kfree(tc35892); return 0; } static const struct i2c_device_id tc35892_id[] = { { "tc35892", 24 }, { } }; MODULE_DEVICE_TABLE(i2c, tc35892_id); static struct i2c_driver tc35892_driver = { .driver.name = "tc35892", .driver.owner = THIS_MODULE, .probe = tc35892_probe, .remove = __devexit_p(tc35892_remove), .id_table = tc35892_id, }; static int __init tc35892_init(void) { return i2c_add_driver(&tc35892_driver); } subsys_initcall(tc35892_init); static void __exit tc35892_exit(void) { i2c_del_driver(&tc35892_driver); } module_exit(tc35892_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("TC35892 MFD core driver"); MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");