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251 lines
6.6 KiB
251 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Core driver for STw4810/STw4811 |
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* |
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* Copyright (C) 2013 ST-Ericsson SA |
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* Written on behalf of Linaro for ST-Ericsson |
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* |
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* Author: Linus Walleij <[email protected]> |
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*/ |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/stw481x.h> |
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#include <linux/module.h> |
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#include <linux/regmap.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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/* |
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* This driver can only access the non-USB portions of STw4811, the register |
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* range 0x00-0x10 dealing with USB is bound to the two special I2C pins used |
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* for USB control. |
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*/ |
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/* Registers inside the power control address space */ |
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#define STW_PC_VCORE_SEL 0x05U |
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#define STW_PC_VAUX_SEL 0x06U |
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#define STW_PC_VPLL_SEL 0x07U |
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/** |
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* stw481x_get_pctl_reg() - get a power control register |
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* @stw481x: handle to the stw481x chip |
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* @reg: power control register to fetch |
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* |
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* The power control registers is a set of one-time-programmable registers |
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* in its own register space, accessed by writing addess bits to these |
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* two registers: bits 7,6,5 of PCTL_REG_LO corresponds to the 3 LSBs of |
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* the address and bits 8,9 of PCTL_REG_HI corresponds to the 2 MSBs of |
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* the address, forming an address space of 5 bits, i.e. 32 registers |
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* 0x00 ... 0x1f can be obtained. |
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*/ |
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static int stw481x_get_pctl_reg(struct stw481x *stw481x, u8 reg) |
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{ |
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u8 msb = (reg >> 3) & 0x03; |
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u8 lsb = (reg << 5) & 0xe0; |
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unsigned int val; |
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u8 vrfy; |
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int ret; |
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ret = regmap_write(stw481x->map, STW_PCTL_REG_HI, msb); |
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if (ret) |
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return ret; |
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ret = regmap_write(stw481x->map, STW_PCTL_REG_LO, lsb); |
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if (ret) |
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return ret; |
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ret = regmap_read(stw481x->map, STW_PCTL_REG_HI, &val); |
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if (ret) |
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return ret; |
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vrfy = (val & 0x03) << 3; |
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ret = regmap_read(stw481x->map, STW_PCTL_REG_LO, &val); |
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if (ret) |
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return ret; |
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vrfy |= ((val >> 5) & 0x07); |
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if (vrfy != reg) |
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return -EIO; |
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return (val >> 1) & 0x0f; |
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} |
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static int stw481x_startup(struct stw481x *stw481x) |
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{ |
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/* Voltages multiplied by 100 */ |
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static const u8 vcore_val[] = { |
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100, 105, 110, 115, 120, 122, 124, 126, 128, |
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130, 132, 134, 136, 138, 140, 145 |
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}; |
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static const u8 vpll_val[] = { 105, 120, 130, 180 }; |
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static const u8 vaux_val[] = { 15, 18, 25, 28 }; |
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u8 vcore; |
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u8 vcore_slp; |
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u8 vpll; |
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u8 vaux; |
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bool vaux_en; |
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bool it_warn; |
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int ret; |
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unsigned int val; |
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ret = regmap_read(stw481x->map, STW_CONF1, &val); |
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if (ret) |
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return ret; |
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vaux_en = !!(val & STW_CONF1_PDN_VAUX); |
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it_warn = !!(val & STW_CONF1_IT_WARN); |
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dev_info(&stw481x->client->dev, "voltages %s\n", |
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(val & STW_CONF1_V_MONITORING) ? "OK" : "LOW"); |
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dev_info(&stw481x->client->dev, "MMC level shifter %s\n", |
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(val & STW_CONF1_MMC_LS_STATUS) ? "high impedance" : "ON"); |
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dev_info(&stw481x->client->dev, "VMMC: %s\n", |
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(val & STW_CONF1_PDN_VMMC) ? "ON" : "disabled"); |
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dev_info(&stw481x->client->dev, "STw481x power control registers:\n"); |
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VCORE_SEL); |
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if (ret < 0) |
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return ret; |
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vcore = ret & 0x0f; |
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VAUX_SEL); |
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if (ret < 0) |
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return ret; |
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vaux = (ret >> 2) & 3; |
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vpll = (ret >> 4) & 1; /* Save bit 4 */ |
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VPLL_SEL); |
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if (ret < 0) |
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return ret; |
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vpll |= (ret >> 1) & 2; |
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dev_info(&stw481x->client->dev, "VCORE: %u.%uV %s\n", |
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vcore_val[vcore] / 100, vcore_val[vcore] % 100, |
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(ret & 4) ? "ON" : "OFF"); |
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dev_info(&stw481x->client->dev, "VPLL: %u.%uV %s\n", |
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vpll_val[vpll] / 100, vpll_val[vpll] % 100, |
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(ret & 0x10) ? "ON" : "OFF"); |
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dev_info(&stw481x->client->dev, "VAUX: %u.%uV %s\n", |
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vaux_val[vaux] / 10, vaux_val[vaux] % 10, |
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vaux_en ? "ON" : "OFF"); |
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ret = regmap_read(stw481x->map, STW_CONF2, &val); |
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if (ret) |
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return ret; |
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dev_info(&stw481x->client->dev, "TWARN: %s threshold, %s\n", |
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it_warn ? "below" : "above", |
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(val & STW_CONF2_MASK_TWARN) ? |
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"enabled" : "mask through VDDOK"); |
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dev_info(&stw481x->client->dev, "VMMC: %s\n", |
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(val & STW_CONF2_VMMC_EXT) ? "internal" : "external"); |
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dev_info(&stw481x->client->dev, "IT WAKE UP: %s\n", |
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(val & STW_CONF2_MASK_IT_WAKE_UP) ? "enabled" : "masked"); |
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dev_info(&stw481x->client->dev, "GPO1: %s\n", |
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(val & STW_CONF2_GPO1) ? "low" : "high impedance"); |
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dev_info(&stw481x->client->dev, "GPO2: %s\n", |
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(val & STW_CONF2_GPO2) ? "low" : "high impedance"); |
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ret = regmap_read(stw481x->map, STW_VCORE_SLEEP, &val); |
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if (ret) |
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return ret; |
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vcore_slp = val & 0x0f; |
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dev_info(&stw481x->client->dev, "VCORE SLEEP: %u.%uV\n", |
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vcore_val[vcore_slp] / 100, vcore_val[vcore_slp] % 100); |
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return 0; |
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} |
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/* |
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* MFD cells - we have one cell which is selected operation |
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* mode, and we always have a GPIO cell. |
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*/ |
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static struct mfd_cell stw481x_cells[] = { |
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{ |
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.of_compatible = "st,stw481x-vmmc", |
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.name = "stw481x-vmmc-regulator", |
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.id = -1, |
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}, |
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}; |
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static const struct regmap_config stw481x_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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}; |
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static int stw481x_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct stw481x *stw481x; |
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int ret; |
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int i; |
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stw481x = devm_kzalloc(&client->dev, sizeof(*stw481x), GFP_KERNEL); |
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if (!stw481x) |
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return -ENOMEM; |
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i2c_set_clientdata(client, stw481x); |
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stw481x->client = client; |
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stw481x->map = devm_regmap_init_i2c(client, &stw481x_regmap_config); |
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if (IS_ERR(stw481x->map)) { |
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ret = PTR_ERR(stw481x->map); |
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dev_err(&client->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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ret = stw481x_startup(stw481x); |
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if (ret) { |
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dev_err(&client->dev, "chip initialization failed\n"); |
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return ret; |
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} |
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/* Set up and register the platform devices. */ |
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for (i = 0; i < ARRAY_SIZE(stw481x_cells); i++) { |
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/* One state holder for all drivers, this is simple */ |
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stw481x_cells[i].platform_data = stw481x; |
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stw481x_cells[i].pdata_size = sizeof(*stw481x); |
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} |
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ret = devm_mfd_add_devices(&client->dev, 0, stw481x_cells, |
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ARRAY_SIZE(stw481x_cells), NULL, 0, NULL); |
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if (ret) |
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return ret; |
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dev_info(&client->dev, "initialized STw481x device\n"); |
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return ret; |
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} |
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/* |
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* This ID table is completely unused, as this is a pure |
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* device-tree probed driver, but it has to be here due to |
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* the structure of the I2C core. |
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*/ |
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static const struct i2c_device_id stw481x_id[] = { |
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{ "stw481x", 0 }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, stw481x_id); |
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static const struct of_device_id stw481x_match[] = { |
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{ .compatible = "st,stw4810", }, |
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{ .compatible = "st,stw4811", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, stw481x_match); |
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static struct i2c_driver stw481x_driver = { |
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.driver = { |
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.name = "stw481x", |
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.of_match_table = stw481x_match, |
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}, |
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.probe = stw481x_probe, |
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.id_table = stw481x_id, |
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}; |
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module_i2c_driver(stw481x_driver); |
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MODULE_AUTHOR("Linus Walleij"); |
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MODULE_DESCRIPTION("STw481x PMIC driver"); |
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MODULE_LICENSE("GPL v2");
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